jiahong
2834 lines
97 KiB
Markdown
2834 lines
97 KiB
Markdown
# 自然写互动课堂应用开发SDK软件 V1.0
|
||
## 鉴别材料
|
||
|
||
---
|
||
|
||
**软件名称**：自然写互动课堂应用开发SDK软件
|
||
**版本号**：V1.0
|
||
**著作权人**：深圳自然写科技有限公司
|
||
**开发完成日期**：2024年6月
|
||
**文档类型**：开发者集成手册 + 接口设计说明书
|
||
|
||
---
|
||
|
||
## 目录
|
||
|
||
- 第一章 软件整体概述
|
||
- 1.1 软件简介与功能综述
|
||
- 1.2 软件用途与适用场景
|
||
- 1.3 运行环境与系统要求
|
||
- 1.4 开发语言与技术规范
|
||
- 1.5 版本说明
|
||
- 第二章 系统架构与设计思路
|
||
- 2.1 总体架构设计
|
||
- 2.2 各层次详细说明
|
||
- 2.3 核心模块架构图
|
||
- 2.4 数据设计
|
||
- 2.5 接口设计原则
|
||
- 2.6 安全设计
|
||
- 2.7 各平台输出形式
|
||
- 第三章 核心模块功能详细说明
|
||
- 3.1 PenConnect SDK 模块
|
||
- 3.2 StrokeRender SDK 模块
|
||
- 3.3 OCR SDK 模块
|
||
- 3.4 Gateway SDK 模块
|
||
- 3.5 Cloud SDK 模块
|
||
- 3.6 UI Component 模块
|
||
- 第四章 操作流程与使用步骤
|
||
- 4.1 Android 集成步骤
|
||
- 4.2 iOS 集成步骤
|
||
- 4.3 PC（Windows/macOS/Linux）集成步骤
|
||
- 4.4 Web（JavaScript/TypeScript）集成步骤
|
||
- 4.5 初始化与鉴权
|
||
- 4.6 完整集成示例
|
||
- 4.7 错误码与异常处理
|
||
- 第五章 与源代码的对应关系
|
||
- 5.1 模块名称与源代码文件对应表
|
||
- 5.2 核心功能类与方法说明
|
||
- 5.3 主要类命名规范
|
||
- 附录
|
||
|
||
---
|
||
|
||
## 第一章 软件整体概述
|
||
|
||
### 1.1 软件简介与功能综述
|
||
|
||
自然写互动课堂应用开发SDK（以下简称"自然写SDK"）是自然写科技为第三方开发者和教育集成商提供的一套多平台软件开发工具包。SDK 封装了自然写互动课堂系统的核心能力，包括点阵笔连接、笔迹实时渲染、手写识别（OCR）、教室网关对接和云平台数据访问等，使第三方开发者能够快速将自然写的智慧课堂能力集成到自己的教育应用中。
|
||
|
||
自然写SDK采用分层模块化架构，核心算法以 C/C++ 实现，通过各平台适配层（JNI/ObjC Bridge/FFI/WASM）对外提供 Java/Kotlin/Swift/JavaScript 等语言的统一 API，支持 Android、iOS、Windows、macOS、Linux、Web 六大平台。
|
||
|
||
**SDK 模块功能综述：**
|
||
|
||
| SDK 模块 | 功能描述 | 支持平台 |
|
||
|---------|---------|---------|
|
||
| PenConnect SDK | 蓝牙/WiFi 连接点阵笔，接收实时笔迹坐标数据流 | Android / iOS / PC / Web |
|
||
| StrokeRender SDK | 笔迹实时渲染与回放（支持压感、颜色、笔锋动画） | Android / iOS / PC / Web |
|
||
| OCR SDK | 调用云端/本地手写识别（文字、数学、笔顺评分） | Android / iOS / PC / Web |
|
||
| Gateway SDK | 对接教室网关，批量管理多支笔数据、课堂控制指令 | Android / iOS / PC |
|
||
| Cloud SDK | 对接自然写云平台 API（用户认证、数据存取、学情查询） | 全平台 |
|
||
| UI Component | 预制 UI 组件（笔迹画布、答题卡、字帖控件等） | Android / iOS / Web |
|
||
|
||
**SDK 整体定位：**
|
||
|
||
```
|
||
自然写互动课堂核心能力
|
||
│
|
||
▼
|
||
自然写SDK（多平台封装）
|
||
├── PenConnect SDK
|
||
├── StrokeRender SDK
|
||
├── OCR SDK
|
||
├── Gateway SDK
|
||
├── Cloud SDK
|
||
└── UI Component
|
||
│
|
||
▼
|
||
第三方教育应用集成（Android App / iOS App / PC 软件 / Web 应用）
|
||
```
|
||
|
||
### 1.2 软件用途与适用场景
|
||
|
||
**主要用途：**
|
||
|
||
自然写SDK面向教育行业的软件开发商、教育集成商和教育机构IT团队，提供标准化的接入方式，使其无需深入了解点阵笔通信协议、笔迹渲染算法、OCR引擎等底层技术细节，即可在自有应用中实现完整的智慧书写教学功能。
|
||
|
||
**典型集成场景：**
|
||
|
||
| 场景 | 接入方 | 使用的 SDK 模块 |
|
||
|------|-------|--------------|
|
||
| 教育软件集成点阵笔数据采集 | 教育软件商 | PenConnect SDK + StrokeRender SDK |
|
||
| 在线学习平台增加手写作业功能 | 在线教育平台 | PenConnect SDK + OCR SDK + Cloud SDK |
|
||
| 教育硬件厂商集成书写评分功能 | 硬件厂商 | PenConnect SDK + OCR SDK |
|
||
| 学校自建智慧课堂系统 | 学校IT团队 | Gateway SDK + Cloud SDK + UI Component |
|
||
| 书法练习应用增加 AI 笔顺评分 | 书法类App开发者 | PenConnect SDK + OCR SDK（笔顺模块） |
|
||
| 教育平台集成学情数据 | 平台方 | Cloud SDK（学情查询 API） |
|
||
|
||
### 1.3 运行环境与系统要求
|
||
|
||
**SDK 各平台运行环境：**
|
||
|
||
| 平台 | 最低要求 | 接入形式 |
|
||
|------|---------|---------|
|
||
| Android | Android 7.0（API Level 24）+ | AAR 包（Maven 仓库） |
|
||
| iOS | iOS 13.0+ | Framework / CocoaPods / Swift Package |
|
||
| Windows | Windows 10 64位 + | DLL 动态库 |
|
||
| macOS | macOS 11.0 (Big Sur)+ | dylib 动态库 / Framework |
|
||
| Linux | Ubuntu 18.04+ / 64位 | .so 动态库 |
|
||
| Web | 支持 WebAssembly 的现代浏览器（Chrome 79+, Firefox 72+） | NPM 包 / CDN |
|
||
|
||
**SDK 开发环境要求：**
|
||
|
||
| 平台 | 开发工具 | 最低版本 |
|
||
|------|---------|---------|
|
||
| Android | Android Studio | Hedgehog 2023.1+ |
|
||
| Android | Gradle | 8.x |
|
||
| iOS | Xcode | 15.0+ |
|
||
| iOS | CocoaPods | 1.12.0+ |
|
||
| Windows | Visual Studio | 2022 |
|
||
| Windows | CMake | 3.25+ |
|
||
| macOS | Xcode | 15.0+ |
|
||
| Web | Node.js | 18 LTS+ |
|
||
| Web | TypeScript | 5.x |
|
||
|
||
### 1.4 开发语言与技术规范
|
||
|
||
**SDK 各层实现语言：**
|
||
|
||
| 层次 | 语言 | 说明 |
|
||
|------|------|------|
|
||
| 核心引擎层 | C/C++（C++17） | BLE协议解析、笔迹平滑算法、坐标变换、数据编解码 |
|
||
| Android 适配层 | Kotlin / Java（JNI） | JNI 桥接 C++ 核心，提供 Kotlin/Java API |
|
||
| iOS 适配层 | Swift / Objective-C（FFI） | ObjC Bridge 调用 C++ 核心，提供 Swift API |
|
||
| Windows/Linux 适配层 | C++ 导出接口（C ABI） | 导出标准 C 接口，可被 C/C++/Python/Java 调用 |
|
||
| macOS 适配层 | C++ / Swift | Framework 封装，提供 Swift/ObjC API |
|
||
| Web 适配层 | TypeScript / WASM | Emscripten 编译 C++ 核心为 WASM，TypeScript 封装 |
|
||
| UI 组件层 | Android View / UIKit / HTML5 Canvas | 各平台原生 UI 组件 |
|
||
|
||
**版本管理规范：**
|
||
- 语义化版本（Semantic Versioning）：MAJOR.MINOR.PATCH
|
||
- MAJOR 版本：不兼容的 API 变更，提供迁移指南
|
||
- MINOR 版本：向后兼容的功能新增
|
||
- PATCH 版本：向后兼容的问题修复
|
||
|
||
### 1.5 版本说明
|
||
|
||
| 版本 | 日期 | 说明 |
|
||
|------|------|------|
|
||
| V1.0.0 | 2024-06 | 正式发布版本，支持 PenConnect/StrokeRender/OCR/Gateway/Cloud/UI 全模块，覆盖 Android/iOS/PC/Web |
|
||
| V0.9.0 | 2024-04 | Beta：API 接口冻结，完成各平台 SDK 集成测试 |
|
||
| V0.5.0 | 2024-01 | Alpha：Android 和 iOS 基础功能验证 |
|
||
|
||
---
|
||
|
||
## 第二章 系统架构与设计思路
|
||
|
||
### 2.1 总体架构设计
|
||
|
||
自然写SDK采用三层模块化架构：上层为应用集成层（第三方开发者直接调用的 API），中间层为平台适配层（Platform Abstraction Layer，各平台原生代码实现），底层为核心引擎层（C/C++ 跨平台内核，实现核心算法）。
|
||
|
||
```
|
||
┌─────────────────────────────────────────────────────────────────────┐
|
||
│ 上层：应用集成层（第三方开发者调用） │
|
||
│ │
|
||
│ ┌───────────────┐ ┌───────────────┐ ┌──────────┐ │
|
||
│ │ PenConnect SDK│ │StrokeRender │ │ OCR SDK │ │
|
||
│ │ │ │ SDK │ │ │ │
|
||
│ └───────────────┘ └───────────────┘ └──────────┘ │
|
||
│ ┌───────────────┐ ┌───────────────┐ ┌──────────────────────────┐ │
|
||
│ │ Gateway SDK │ │ Cloud SDK │ │ UI Component │ │
|
||
│ │ │ │ │ │ (InkCanvas/QuizCard等) │ │
|
||
│ └───────────────┘ └───────────────┘ └──────────────────────────┘ │
|
||
│ │
|
||
├─────────────────────────────────────────────────────────────────────┤
|
||
│ 中间层：平台适配层（Platform Abstraction Layer） │
|
||
│ │
|
||
│ ┌──────────┐ ┌──────────┐ ┌──────────┐ ┌──────────┐ ┌──────────┐ │
|
||
│ │ Android │ │ iOS │ │ Windows │ │ macOS │ │ Web │ │
|
||
│ │ (JNI) │ │(ObjCBridge│ │ (DLL) │ │ (dylib) │ │(FFI/WASM)│ │
|
||
│ └──────────┘ └──────────┘ └──────────┘ └──────────┘ └──────────┘ │
|
||
│ │
|
||
├─────────────────────────────────────────────────────────────────────┤
|
||
│ 底层：核心引擎层（C/C++ 跨平台内核） │
|
||
│ │
|
||
│ ┌─────────────┐ ┌─────────────┐ ┌─────────────┐ ┌─────────────┐ │
|
||
│ │ BLE协议解析 │ │ 笔迹平滑算法 │ │ 坐标变换 │ │ 数据编解码 │ │
|
||
│ │ble_parser.cpp│ │stroke_smooth│ │coord_trans │ │data_codec │ │
|
||
│ └─────────────┘ └─────────────┘ └─────────────┘ └─────────────┘ │
|
||
│ │
|
||
└─────────────────────────────────────────────────────────────────────┘
|
||
```
|
||
|
||
### 2.2 各层次详细说明
|
||
|
||
#### 2.2.1 核心引擎层（C/C++）
|
||
|
||
核心引擎层是 SDK 的算法核心，采用纯 C/C++ 实现，不依赖任何操作系统特定 API，可跨所有目标平台编译：
|
||
|
||
**BLE 协议解析模块（ble_parser）：**
|
||
- 解析自然写点阵笔 BLE GATT Notify 原始字节流
|
||
- 处理多包分片重组（单帧数据可能跨多个 BLE MTU 包）
|
||
- 提取笔迹坐标（x/y）、压感值（pressure）、时间戳（timestamp）和抬笔标志（penUp）
|
||
- 支持点阵码坐标和归一化坐标两种输出格式
|
||
|
||
**笔迹平滑算法模块（stroke_smooth）：**
|
||
- 实现 Chaikin 曲线平滑（迭代细分，减少锯齿）
|
||
- 实现三次贝塞尔曲线平滑（中点算法）
|
||
- 速度敏感线宽调整（书写速度影响线宽，模拟真实书写手感）
|
||
- 笔锋效果计算（笔画起止处渐细渐粗，模拟毛笔笔锋）
|
||
|
||
**坐标变换模块（coord_trans）：**
|
||
- 点阵码坐标 → 屏幕坐标的仿射变换（对齐校准）
|
||
- 归一化坐标 → 屏幕像素坐标（根据 View 尺寸缩放）
|
||
- 旋转变换（支持横竖屏切换时坐标系转换）
|
||
- 透视变换（修正纸张倾斜导致的坐标偏差）
|
||
|
||
**数据编解码模块（data_codec）：**
|
||
- 笔迹数据序列化（二进制压缩格式，Delta 编码减少数据量）
|
||
- 笔迹数据反序列化
|
||
- 与云平台传输协议（Protobuf）的转换
|
||
- 数据完整性校验（CRC32）
|
||
|
||
#### 2.2.2 平台适配层
|
||
|
||
**Android 适配层（JNI）：**
|
||
|
||
```cpp
|
||
// android/jni/pen_connect_jni.cpp
|
||
// JNI 接口导出，供 Java/Kotlin 调用 C++ 核心
|
||
|
||
extern "C" JNIEXPORT jlong JNICALL
|
||
Java_com_writech_sdk_penconnect_NativePenEngine_createEngine(JNIEnv* env, jobject thiz) {
|
||
auto* engine = new writech::PenConnectEngine();
|
||
return reinterpret_cast<jlong>(engine);
|
||
}
|
||
|
||
extern "C" JNIEXPORT void JNICALL
|
||
Java_com_writech_sdk_penconnect_NativePenEngine_processBleBytesNative(
|
||
JNIEnv* env, jobject thiz, jlong handle, jbyteArray bytes) {
|
||
auto* engine = reinterpret_cast<writech::PenConnectEngine*>(handle);
|
||
jbyte* data = env->GetByteArrayElements(bytes, nullptr);
|
||
jsize len = env->GetArrayLength(bytes);
|
||
engine->processBleBytes(reinterpret_cast<uint8_t*>(data), len);
|
||
env->ReleaseByteArrayElements(bytes, data, JNI_ABORT);
|
||
}
|
||
```
|
||
|
||
**iOS 适配层（ObjC Bridge + Swift）：**
|
||
|
||
```swift
|
||
// ios/Sources/PenConnectBridge.swift
|
||
// Swift 包装 Objective-C Bridge（Objective-C Bridge 调用 C++ 核心）
|
||
|
||
import Foundation
|
||
|
||
@objc public class WritechPenEngine: NSObject {
|
||
private var nativeHandle: UnsafeMutableRawPointer
|
||
|
||
public override init() {
|
||
self.nativeHandle = WritechNative.createPenEngine()
|
||
super.init()
|
||
}
|
||
|
||
public func processBleBytesData(_ data: Data) {
|
||
data.withUnsafeBytes { rawBytes in
|
||
let ptr = rawBytes.baseAddress!.assumingMemoryBound(to: UInt8.self)
|
||
WritechNative.processBleBytes(nativeHandle, ptr, Int32(data.count))
|
||
}
|
||
}
|
||
|
||
deinit {
|
||
WritechNative.destroyPenEngine(nativeHandle)
|
||
}
|
||
}
|
||
```
|
||
|
||
**Web 适配层（TypeScript + WASM）：**
|
||
|
||
```typescript
|
||
// web/src/wasm-bridge.ts
|
||
// TypeScript 封装 Emscripten 编译的 WASM 模块
|
||
|
||
import WritechWasmModule from './writech_core.js';
|
||
|
||
let wasmInstance: any = null;
|
||
|
||
export async function initWasm(): Promise<void> {
|
||
wasmInstance = await WritechWasmModule();
|
||
}
|
||
|
||
export function processBleBytes(bytes: Uint8Array): InkPoint[] {
|
||
if (!wasmInstance) throw new Error('WASM not initialized');
|
||
|
||
const ptr = wasmInstance._malloc(bytes.length);
|
||
wasmInstance.HEAPU8.set(bytes, ptr);
|
||
const resultPtr = wasmInstance._processBleBytes(ptr, bytes.length);
|
||
wasmInstance._free(ptr);
|
||
|
||
// 解析 C 结构体数组 → TypeScript 对象数组
|
||
return parseInkPointArray(wasmInstance, resultPtr);
|
||
}
|
||
```
|
||
|
||
#### 2.2.3 应用集成层
|
||
|
||
应用集成层为第三方开发者提供简洁、语义清晰的高层 API，隐藏底层复杂性。每个 SDK 模块对应一个或多个接口类，提供统一的事件驱动回调和异步 Promise/Coroutine 接口。
|
||
|
||
**设计原则：**
|
||
- **单一职责**：每个 SDK 模块只负责一个功能域
|
||
- **链式配置**：Builder 模式配置 SDK，避免过长的构造函数参数
|
||
- **事件驱动**：关键状态变化通过回调/Listener/Flow/Promise 异步通知
|
||
- **错误语义**：详细的错误码和错误描述，方便开发者调试
|
||
- **线程安全**：内部使用独立工作线程，回调在 UI 线程或指定线程执行
|
||
|
||
### 2.3 核心模块架构图
|
||
|
||
**SDK 调用链路图（Android 示例）：**
|
||
|
||
```
|
||
第三方 Android 应用（Kotlin/Java）
|
||
│ 调用 PenManager.startScan()
|
||
▼
|
||
PenConnect SDK（Android AAR）
|
||
│ 调用 BleScanner（Android BluetoothAdapter 封装）
|
||
▼
|
||
Android 系统 Bluetooth Stack
|
||
│ BLE Notify 回调
|
||
▼
|
||
PenConnect SDK（接收原始字节）
|
||
│ JNI 调用
|
||
▼
|
||
C++ 核心引擎（ble_parser + coord_trans）
|
||
│ 解析结果（InkPoint 数组）
|
||
▼
|
||
SDK InkListener.onInkData(points) 回调
|
||
│
|
||
▼
|
||
第三方应用业务逻辑（保存、渲染、上传等）
|
||
│ 同时调用 StrokeCanvas.drawStroke()
|
||
▼
|
||
StrokeRender SDK（笔迹渲染）
|
||
│ JNI 调用 stroke_smooth
|
||
▼
|
||
C++ 贝塞尔平滑 → Android Canvas 绘制
|
||
│
|
||
▼
|
||
屏幕显示笔迹
|
||
```
|
||
|
||
**SDK 模块间依赖关系：**
|
||
|
||
```
|
||
PenConnect SDK ─────────────────────► StrokeRender SDK
|
||
│ │
|
||
│ InkPoint 数据流 │ 渲染输入
|
||
▼ ▼
|
||
Gateway SDK ──────────────────────────► OCR SDK
|
||
│ │
|
||
│ 批量笔迹管理 │ 识别请求
|
||
▼ ▼
|
||
Cloud SDK ◄──────────────────────────── OCR SDK
|
||
│ │
|
||
│ API 访问 │ 云端识别
|
||
▼ ▼
|
||
自然写云平台 识别结果返回应用
|
||
|
||
UI Component ← 依赖 → PenConnect SDK + StrokeRender SDK
|
||
```
|
||
|
||
### 2.4 数据设计
|
||
|
||
#### 2.4.1 SDK 核心数据结构
|
||
|
||
**跨平台统一数据类型（C++ 定义，各平台适配层映射）：**
|
||
|
||
```cpp
|
||
// core/include/writech_types.h
|
||
|
||
// 笔迹点（核心数据单元）
|
||
struct InkPoint {
|
||
float x; // 归一化横坐标 [0.0, 1.0]（相对于书写区域宽度）
|
||
float y; // 归一化纵坐标 [0.0, 1.0]（相对于书写区域高度）
|
||
float pressure; // 压感值 [0.0, 1.0]（0=无压感）
|
||
uint64_t timestamp;// 微秒时间戳（相对于设备启动，或 Unix 时间戳）
|
||
bool is_pen_up; // true=抬笔（笔画结束标记）
|
||
};
|
||
|
||
// 笔画路径（多个笔迹点组成一条笔画）
|
||
struct StrokePath {
|
||
std::vector<InkPoint> points; // 笔迹点序列
|
||
uint32_t color_argb; // 笔色（ARGB 32位）
|
||
float base_width; // 基础线宽（像素，压感在此基础上缩放）
|
||
char pen_id[32]; // 来源笔的序列号（多笔区分用）
|
||
};
|
||
|
||
// 点阵笔设备信息
|
||
struct PenDevice {
|
||
char mac_address[18]; // MAC 地址（"AA:BB:CC:DD:EE:FF"）
|
||
char device_name[64]; // 设备名称（如"WritechPen-A1B2"）
|
||
int battery_level; // 电量百分比 [0, 100]
|
||
int connection_state; // 连接状态（枚举：DISCONNECTED/CONNECTING/CONNECTED）
|
||
char firmware_version[16]; // 固件版本号
|
||
char serial_number[32]; // 设备序列号
|
||
};
|
||
|
||
// 手写识别结果
|
||
struct RecognitionResult {
|
||
int type; // 识别类型（1=文字 2=数学 3=笔顺 4=评分）
|
||
char text[1024]; // 识别文字结果（UTF-8）
|
||
float confidence; // 置信度 [0.0, 1.0]
|
||
float bbox[4]; // 边界框 [x, y, w, h]（归一化坐标）
|
||
char detail_json[4096]; // 详细结果（JSON，含候选字/公式/笔顺分析）
|
||
};
|
||
|
||
// SDK 配置
|
||
struct SDKConfig {
|
||
char app_key[64]; // AppKey（由自然写颁发）
|
||
char app_secret[64]; // AppSecret（用于请求签名）
|
||
char server_url[256]; // 云平台服务器地址（可自定义私有部署）
|
||
int log_level; // 日志级别（0=关闭 1=ERROR 2=WARN 3=INFO 4=DEBUG）
|
||
bool use_local_ocr; // 是否使用本地 OCR（需单独授权）
|
||
};
|
||
```
|
||
|
||
#### 2.4.2 各平台语言映射
|
||
|
||
**Android（Kotlin）：**
|
||
|
||
```kotlin
|
||
// Android SDK 数据类（与 C++ 结构体对应，通过 JNI 转换）
|
||
|
||
data class InkPoint(
|
||
val x: Float,
|
||
val y: Float,
|
||
val pressure: Float,
|
||
val timestamp: Long,
|
||
val isPenUp: Boolean
|
||
)
|
||
|
||
data class StrokePath(
|
||
val points: List<InkPoint>,
|
||
val colorArgb: Int,
|
||
val baseWidth: Float,
|
||
val penId: String
|
||
)
|
||
|
||
data class PenDevice(
|
||
val macAddress: String,
|
||
val deviceName: String,
|
||
val batteryLevel: Int,
|
||
val connectionState: PenConnectionState,
|
||
val firmwareVersion: String,
|
||
val serialNumber: String
|
||
)
|
||
|
||
data class RecognitionResult(
|
||
val type: RecognitionType,
|
||
val text: String,
|
||
val confidence: Float,
|
||
val boundingBox: RectF,
|
||
val detailJson: String
|
||
)
|
||
```
|
||
|
||
**iOS（Swift）：**
|
||
|
||
```swift
|
||
// iOS SDK 数据结构
|
||
|
||
public struct InkPoint {
|
||
public let x: Float
|
||
public let y: Float
|
||
public let pressure: Float
|
||
public let timestamp: UInt64
|
||
public let isPenUp: Bool
|
||
}
|
||
|
||
public struct StrokePath {
|
||
public let points: [InkPoint]
|
||
public let colorARGB: UInt32
|
||
public let baseWidth: Float
|
||
public let penId: String
|
||
}
|
||
|
||
public struct PenDevice {
|
||
public let macAddress: String
|
||
public let deviceName: String
|
||
public let batteryLevel: Int
|
||
public let connectionState: PenConnectionState
|
||
public let firmwareVersion: String
|
||
public let serialNumber: String
|
||
}
|
||
```
|
||
|
||
**TypeScript（Web）：**
|
||
|
||
```typescript
|
||
// TypeScript SDK 数据类型
|
||
|
||
export interface InkPoint {
|
||
x: number; // [0.0, 1.0]
|
||
y: number; // [0.0, 1.0]
|
||
pressure: number; // [0.0, 1.0]
|
||
timestamp: number; // 毫秒时间戳
|
||
isPenUp: boolean;
|
||
}
|
||
|
||
export interface StrokePath {
|
||
points: InkPoint[];
|
||
colorArgb: number;
|
||
baseWidth: number;
|
||
penId: string;
|
||
}
|
||
|
||
export interface PenDevice {
|
||
macAddress: string;
|
||
deviceName: string;
|
||
batteryLevel: number;
|
||
connectionState: PenConnectionState;
|
||
firmwareVersion: string;
|
||
serialNumber: string;
|
||
}
|
||
|
||
export interface RecognitionResult {
|
||
type: RecognitionType;
|
||
text: string;
|
||
confidence: number;
|
||
boundingBox: { x: number; y: number; w: number; h: number };
|
||
detailJson: string;
|
||
}
|
||
```
|
||
|
||
### 2.5 接口设计原则
|
||
|
||
SDK API 设计遵循以下原则：
|
||
|
||
1. **最小接入成本**：核心功能 3 行代码可完成初始化和基本调用
|
||
2. **渐进式复杂度**：基础功能简单易用，高级定制通过可选配置暴露
|
||
3. **一致性**：各平台 API 保持语义等价，命名风格遵循各平台惯例
|
||
4. **不可变语义**：数据类使用不可变对象（Kotlin data class / Swift struct / TypeScript readonly），避免副作用
|
||
5. **取消支持**：所有异步操作支持取消（Android Coroutine Job / iOS Task / Web AbortController）
|
||
6. **背压机制**：笔迹数据流支持背压（Flow backpressure / RxJava Flowable / Web Stream FIFO）
|
||
|
||
### 2.6 安全设计
|
||
|
||
**接入认证（AppKey + AppSecret 签名）：**
|
||
|
||
```
|
||
请求签名算法：
|
||
1. 将请求参数按 key 字典序排序
|
||
2. 拼接字符串：{appKey}{timestamp}{排序后的参数键值对}
|
||
3. 使用 AppSecret 对拼接字符串进行 HMAC-SHA256 签名
|
||
4. 将签名（Base64 编码）附加到请求头：X-Writech-Signature
|
||
5. 服务端验证签名，防止请求被篡改或重放攻击
|
||
|
||
示例（Kotlin）：
|
||
val timestamp = System.currentTimeMillis().toString()
|
||
val params = sortedMapOf("action" to "ocr", "appKey" to appKey)
|
||
val stringToSign = appKey + timestamp + params.entries.joinToString("") { "${it.key}${it.value}" }
|
||
val signature = hmacSha256(stringToSign, appSecret).toBase64()
|
||
```
|
||
|
||
**数据保护：**
|
||
- SDK 本地不持久化业务数据（笔迹、识别结果），开发者负责数据存储策略
|
||
- 仅缓存必要的 SDK 运行配置（AppKey、服务器地址）
|
||
- 缓存数据通过 Android EncryptedSharedPreferences / iOS Keychain 加密存储
|
||
|
||
**代码保护：**
|
||
- C++ 核心库以编译后的 `.so`/`.dylib`/`.dll` 形式分发，不附带源码
|
||
- Android Java/Kotlin 层通过 ProGuard/R8 混淆
|
||
- iOS Swift 代码编译为二进制 Framework，不包含源码
|
||
- Web WASM 模块进行代码混淆（Emscripten 优化编译）
|
||
|
||
**沙箱隔离：**
|
||
- SDK 在独立线程运行，C++ 核心库中的异常由 JNI/ObjC Bridge 捕获并转换，不影响宿主应用主线程
|
||
- SDK 资源（线程/内存）在 `release()` 后完全释放，不留后台线程
|
||
|
||
### 2.7 各平台输出形式
|
||
|
||
| 平台 | 输出形式 | 引入方式 |
|
||
|------|---------|---------|
|
||
| Android | AAR 包（含 .so for arm64-v8a/armeabi-v7a/x86_64） | Maven 仓库 `implementation 'com.writech.sdk:...'` |
|
||
| iOS | XCFramework（含 arm64/x86_64 slice） | CocoaPods `pod 'WritechSDK'` / Swift Package |
|
||
| Windows | x64 DLL + 头文件 | CMake `find_package` / 手动链接 |
|
||
| macOS | Universal dylib + Framework | CocoaPods / Swift Package / CMake |
|
||
| Linux | x86_64 .so + 头文件 | CMake `find_package` / 手动链接 |
|
||
| Web | NPM 包（含 .wasm + .js） | `npm install @writech/sdk` |
|
||
| 配套 | API 文档、示例工程、集成指南、Changelog | 开发者门户网站 |
|
||
|
||
---
|
||
|
||
## 第三章 核心模块功能详细说明
|
||
|
||
### 3.1 PenConnect SDK 模块
|
||
|
||
#### 3.1.1 模块功能描述
|
||
|
||
PenConnect SDK 是自然写SDK的基础模块，负责发现、连接自然写点阵笔并持续接收笔迹数据流。支持 BLE 蓝牙连接（主要场景）和 Wi-Fi 直连（可选，需笔固件支持）两种连接方式。
|
||
|
||
**核心功能：**
|
||
- 扫描周围可用的自然写点阵笔（按 BLE 服务 UUID 过滤）
|
||
- 建立与点阵笔的 GATT 连接并订阅笔迹 Notify Characteristic
|
||
- 将原始 BLE 字节流解析为结构化的 `InkPoint` 数据（通过 C++ 核心引擎）
|
||
- 管理连接状态（连接/断线/重连），提供状态监听
|
||
- 支持同时连接多支笔（最多 4 支）
|
||
|
||
#### 3.1.2 完整 API 规范
|
||
|
||
**Android（Kotlin）API：**
|
||
|
||
```kotlin
|
||
// 1. 初始化 SDK（Application.onCreate 或首次使用前调用一次）
|
||
WritechSDK.init(context, SDKConfig(
|
||
appKey = "your_app_key",
|
||
appSecret = "your_app_secret",
|
||
logLevel = LogLevel.INFO
|
||
))
|
||
|
||
// 2. 获取 PenManager 实例（单例）
|
||
val penManager = WritechSDK.penManager
|
||
|
||
// 3. 扫描点阵笔（Flow 流式返回发现的设备）
|
||
penManager.startScan(timeoutMs = 15_000)
|
||
.collect { device ->
|
||
Log.d(TAG, "发现笔：${device.deviceName}, MAC: ${device.macAddress}")
|
||
// 自动连接或展示给用户选择
|
||
penManager.connect(device)
|
||
}
|
||
|
||
// 4. 停止扫描
|
||
penManager.stopScan()
|
||
|
||
// 5. 连接指定点阵笔
|
||
penManager.connect(device)
|
||
|
||
// 6. 监听连接状态
|
||
penManager.connectionStateFlow.collect { state ->
|
||
when (state) {
|
||
is PenConnectionState.Connected -> showToast("笔已连接：${state.device.deviceName}")
|
||
is PenConnectionState.Disconnected -> showToast("笔已断开")
|
||
is PenConnectionState.Reconnecting -> showProgress("重连中...")
|
||
else -> {}
|
||
}
|
||
}
|
||
|
||
// 7. 接收笔迹数据（Flow 流）
|
||
penManager.inkDataFlow.collect { points ->
|
||
// points: List<InkPoint>，每批次包含 1~34 个笔迹点
|
||
strokeRenderer.addPoints(points)
|
||
}
|
||
|
||
// 8. 读取电量
|
||
val batteryLevel = penManager.getBatteryLevel() // 0~100
|
||
|
||
// 9. 断开连接
|
||
penManager.disconnect()
|
||
|
||
// 10. 释放资源（Activity.onDestroy 时调用）
|
||
penManager.release()
|
||
```
|
||
|
||
**iOS（Swift）API：**
|
||
|
||
```swift
|
||
// 1. 初始化
|
||
WritechSDK.shared.initialize(config: SDKConfig(
|
||
appKey: "your_app_key",
|
||
appSecret: "your_app_secret",
|
||
logLevel: .info
|
||
))
|
||
|
||
// 2. 获取 PenManager
|
||
let penManager = WritechSDK.shared.penManager
|
||
|
||
// 3. 扫描点阵笔（async/await）
|
||
penManager.scanDelegate = self
|
||
penManager.startScan(timeout: 15)
|
||
|
||
// PenManagerDelegate 回调
|
||
func penManager(_ manager: PenManager, didDiscoverPen pen: PenDevice) {
|
||
print("发现笔：\(pen.deviceName)")
|
||
manager.connect(pen: pen)
|
||
}
|
||
|
||
// 4. 监听连接状态（Publisher）
|
||
penManager.connectionStatePublisher
|
||
.sink { state in
|
||
switch state {
|
||
case .connected(let pen): print("已连接：\(pen.deviceName)")
|
||
case .disconnected: print("已断开")
|
||
default: break
|
||
}
|
||
}
|
||
.store(in: &cancellables)
|
||
|
||
// 5. 接收笔迹数据（Publisher）
|
||
penManager.inkDataPublisher
|
||
.sink { points in
|
||
self.strokeRenderer.addPoints(points)
|
||
}
|
||
.store(in: &cancellables)
|
||
|
||
// 6. 断开连接
|
||
penManager.disconnect()
|
||
```
|
||
|
||
**TypeScript（Web）API：**
|
||
|
||
```typescript
|
||
import { WritechSDK, PenConnectionState } from '@writech/sdk';
|
||
|
||
// 1. 初始化（Web 需要用户授权 Web Bluetooth）
|
||
await WritechSDK.init({
|
||
appKey: 'your_app_key',
|
||
appSecret: 'your_app_secret',
|
||
});
|
||
|
||
const penManager = WritechSDK.penManager;
|
||
|
||
// 2. 扫描并连接（Web Bluetooth API 要求用户手势触发）
|
||
const device = await penManager.requestPen(); // 弹出浏览器选择框
|
||
await penManager.connect(device);
|
||
|
||
// 3. 监听连接状态
|
||
penManager.onConnectionStateChange = (state: PenConnectionState) => {
|
||
console.log('连接状态：', state);
|
||
};
|
||
|
||
// 4. 接收笔迹数据
|
||
penManager.onInkData = (points: InkPoint[]) => {
|
||
strokeCanvas.addPoints(points);
|
||
};
|
||
|
||
// 5. 断开连接
|
||
await penManager.disconnect();
|
||
```
|
||
|
||
#### 3.1.3 多笔管理
|
||
|
||
SDK 支持同时连接最多 4 支点阵笔，通过 `penId`（笔序列号）区分不同笔的数据：
|
||
|
||
```kotlin
|
||
// Android 多笔连接示例
|
||
val pen1 = PenDevice(macAddress = "AA:BB:CC:DD:EE:01", ...)
|
||
val pen2 = PenDevice(macAddress = "AA:BB:CC:DD:EE:02", ...)
|
||
|
||
penManager.connectMultiple(listOf(pen1, pen2))
|
||
|
||
penManager.inkDataFlow.collect { batch ->
|
||
// InkDataBatch 包含 penId 标识来源笔
|
||
batch.groupBy { it.penId }.forEach { (penId, points) ->
|
||
strokeMap[penId]?.addPoints(points)
|
||
}
|
||
}
|
||
```
|
||
|
||
---
|
||
|
||
### 3.2 StrokeRender SDK 模块
|
||
|
||
#### 3.2.1 模块功能描述
|
||
|
||
StrokeRender SDK 提供高性能的笔迹渲染能力，支持实时渲染（书写过程）和回放渲染（查看历史书写）两种模式，支持压感线宽变化和笔锋效果。
|
||
|
||
**核心功能：**
|
||
- 实时渲染：将 PenConnect SDK 输出的 `InkPoint` 流渲染为平滑笔迹
|
||
- 贝塞尔平滑：自动应用三次贝塞尔曲线算法消除锯齿
|
||
- 压感线宽：根据压感值动态调整笔画宽度（模拟真实书写手感）
|
||
- 笔锋效果：笔画起止处线宽渐变（模拟毛笔/钢笔笔锋）
|
||
- 书写回放：以指定速度重放历史笔迹，支持暂停/继续/快进
|
||
- 笔色和笔型配置：支持多种笔色、透明度、笔型（圆笔/方笔/毛笔）
|
||
|
||
#### 3.2.2 API 规范
|
||
|
||
**Android（Kotlin）API：**
|
||
|
||
```kotlin
|
||
// 获取 StrokeCanvas 实例（绑定到 View）
|
||
val strokeCanvas = WritechSDK.strokeRender.createCanvas(
|
||
targetView = inkCanvasView,
|
||
config = CanvasConfig(
|
||
defaultColor = Color.BLACK,
|
||
defaultWidth = 4f, // dp
|
||
enablePressure = true, // 启用压感线宽
|
||
enableTaper = true // 启用笔锋效果
|
||
)
|
||
)
|
||
|
||
// 方式1：直接绑定 PenManager（自动接收笔迹）
|
||
strokeCanvas.bindPenManager(penManager)
|
||
|
||
// 方式2：手动添加笔迹点（开发者自行接收数据）
|
||
strokeCanvas.beginStroke(penId = "pen_001", color = Color.BLACK, width = 4f)
|
||
strokeCanvas.addPoints(points)
|
||
strokeCanvas.endStroke()
|
||
|
||
// 书写回放
|
||
strokeCanvas.replay(
|
||
strokes = savedStrokes, // 历史笔迹数据
|
||
speed = 1.5f, // 回放速度（1.0=原速，0.5=半速，2.0=两倍速）
|
||
onComplete = { println("回放完成") }
|
||
)
|
||
|
||
// 暂停/继续回放
|
||
strokeCanvas.pauseReplay()
|
||
strokeCanvas.resumeReplay()
|
||
|
||
// 清除画布
|
||
strokeCanvas.clear()
|
||
|
||
// 导出笔迹为 Bitmap
|
||
val bitmap: Bitmap = strokeCanvas.exportBitmap()
|
||
|
||
// 获取当前所有笔画数据（用于保存）
|
||
val strokes: List<StrokePath> = strokeCanvas.getAllStrokes()
|
||
|
||
// 撤销/重做
|
||
strokeCanvas.undo()
|
||
strokeCanvas.redo()
|
||
|
||
// 释放资源
|
||
strokeCanvas.release()
|
||
```
|
||
|
||
**TypeScript（Web）API：**
|
||
|
||
```typescript
|
||
import { StrokeCanvas, CanvasConfig } from '@writech/sdk';
|
||
|
||
// 绑定 HTML Canvas 元素
|
||
const strokeCanvas = WritechSDK.strokeRender.createCanvas({
|
||
element: document.getElementById('ink-canvas') as HTMLCanvasElement,
|
||
config: {
|
||
defaultColor: '#000000',
|
||
defaultWidth: 4,
|
||
enablePressure: true,
|
||
enableTaper: true,
|
||
renderMode: 'webgl2', // 使用 WebGL2 加速渲染（可选 'canvas2d'）
|
||
},
|
||
});
|
||
|
||
// 绑定 PenManager 自动接收笔迹
|
||
strokeCanvas.bindPenManager(penManager);
|
||
|
||
// 书写回放
|
||
await strokeCanvas.replay({
|
||
strokes: savedStrokes,
|
||
speed: 1.0,
|
||
});
|
||
|
||
// 导出为 PNG Blob
|
||
const blob = await strokeCanvas.exportBlob('image/png');
|
||
|
||
// 获取笔画数据（JSON 序列化后可保存到服务器）
|
||
const strokesJson = JSON.stringify(strokeCanvas.getAllStrokes());
|
||
```
|
||
|
||
---
|
||
|
||
### 3.3 OCR SDK 模块
|
||
|
||
#### 3.3.1 模块功能描述
|
||
|
||
OCR SDK 提供手写内容的智能识别能力，调用自然写云端 AI 识别引擎（或本地离线识别引擎，需额外授权），支持汉字识别、数学公式识别和笔顺评分三种识别类型。
|
||
|
||
**识别类型说明：**
|
||
|
||
| 识别类型 | 功能 | 典型应用 |
|
||
|---------|------|---------|
|
||
| 文字识别（TextOCR） | 识别手写汉字、字母、数字 | 作业批改、字迹转文字 |
|
||
| 数学识别（MathOCR） | 识别手写数学表达式（加减乘除、分数、根号等） | 数学作业识别与批改 |
|
||
| 笔顺评分（StrokeOrder） | 评估汉字书写笔顺是否正确，给出书写质量分数 | 字帖练习评分 |
|
||
|
||
#### 3.3.2 API 规范
|
||
|
||
**Android（Kotlin）API：**
|
||
|
||
```kotlin
|
||
val ocrEngine = WritechSDK.ocrEngine
|
||
|
||
// 1. 文字识别（异步，返回识别结果）
|
||
val result = ocrEngine.recognizeText(
|
||
strokes = strokeCanvas.getAllStrokes(),
|
||
options = TextOCROptions(
|
||
language = "zh-CN", // 识别语言
|
||
candidates = 5, // 返回候选字数量（最多10个）
|
||
contextHint = "春夏秋冬" // 上下文提示（提升识别准确率，可选）
|
||
)
|
||
)
|
||
// result.text → 最优识别文字
|
||
// result.confidence → 置信度
|
||
// result.candidates → 候选字列表（含各自置信度）
|
||
|
||
// 2. 数学表达式识别
|
||
val mathResult = ocrEngine.recognizeMath(
|
||
strokes = mathStrokes,
|
||
options = MathOCROptions(
|
||
grade = "primary_3", // 年级提示（影响识别范围）
|
||
returnLatex = true // 同时返回 LaTeX 格式
|
||
)
|
||
)
|
||
// mathResult.text → 识别结果（如"3 + 5 = 8"）
|
||
// mathResult.latex → LaTeX 格式（如"3 + 5 = 8"）
|
||
// mathResult.isCorrect → 算式是否成立（Boolean）
|
||
|
||
// 3. 笔顺评分
|
||
val orderResult = ocrEngine.evaluateStrokeOrder(
|
||
character = "春", // 目标汉字
|
||
strokes = writtenStrokes, // 学生书写的笔画序列
|
||
strict = false // strict=true 严格模式（同笔顺才算对）
|
||
)
|
||
// orderResult.score → 综合评分 [0, 100]
|
||
// orderResult.strokeOrderScore → 笔顺分 [0, 40]
|
||
// orderResult.shapeScore → 字形分 [0, 35]
|
||
// orderResult.proportionScore → 比例分 [0, 25]
|
||
// orderResult.errorDetails → 错误详情列表（每条含错误类型和建议）
|
||
|
||
// 4. 批量识别（优化网络请求）
|
||
val batchResults = ocrEngine.recognizeBatch(
|
||
items = listOf(
|
||
BatchItem(type = OcrType.TEXT, strokes = strokes1),
|
||
BatchItem(type = OcrType.MATH, strokes = strokes2),
|
||
)
|
||
)
|
||
|
||
// 5. 本地 OCR（需开启本地识别授权）
|
||
val localResult = ocrEngine.recognizeTextLocal(strokes = strokes)
|
||
```
|
||
|
||
**TypeScript（Web）API：**
|
||
|
||
```typescript
|
||
const ocrEngine = WritechSDK.ocrEngine;
|
||
|
||
// 文字识别
|
||
const result = await ocrEngine.recognizeText({
|
||
strokes: strokeCanvas.getAllStrokes(),
|
||
options: {
|
||
language: 'zh-CN',
|
||
candidates: 5,
|
||
},
|
||
});
|
||
console.log('识别结果：', result.text, '置信度：', result.confidence);
|
||
|
||
// 笔顺评分
|
||
const scoreResult = await ocrEngine.evaluateStrokeOrder({
|
||
character: '春',
|
||
strokes: writtenStrokes,
|
||
});
|
||
console.log('评分：', scoreResult.score, '错误：', scoreResult.errorDetails);
|
||
```
|
||
|
||
---
|
||
|
||
### 3.4 Gateway SDK 模块
|
||
|
||
#### 3.4.1 模块功能描述
|
||
|
||
Gateway SDK 用于对接自然写教室网关，支持批量管理多支点阵笔数据（通过网关汇聚）和发送课堂控制指令（发题、收卷、分组等），主要用于教室多用户场景（黑板端、PC 端等）。
|
||
|
||
**与 PenConnect SDK 的区别：**
|
||
|
||
| 维度 | PenConnect SDK | Gateway SDK |
|
||
|------|---------------|------------|
|
||
| 连接对象 | 直接连接点阵笔（BLE） | 连接教室网关（WebSocket） |
|
||
| 适用场景 | 学生/教师个人设备（手机/Pad） | 教室公共设备（黑板/PC） |
|
||
| 管理笔数 | 1~4 支（直连） | 全班 30~60 支（通过网关） |
|
||
| 控制能力 | 仅数据接收 | 数据接收 + 课堂控制指令 |
|
||
|
||
#### 3.4.2 API 规范
|
||
|
||
```kotlin
|
||
// Android（Kotlin）示例
|
||
val gatewayClient = WritechSDK.gatewayClient
|
||
|
||
// 1. 发现并连接教室网关（mDNS 自动发现）
|
||
gatewayClient.startDiscovery()
|
||
.collect { gateways ->
|
||
val myGateway = gateways.find { it.roomName == "三年级2班" }
|
||
myGateway?.let { gatewayClient.connect(it) }
|
||
}
|
||
|
||
// 2. 手动指定 IP 连接
|
||
gatewayClient.connectByIp(ip = "192.168.1.100", port = 8080)
|
||
|
||
// 3. 接收全班笔迹数据（按学生ID分流）
|
||
gatewayClient.classroomInkFlow.collect { batch ->
|
||
batch.studentStrokes.forEach { (studentId, points) ->
|
||
studentCanvasMap[studentId]?.addPoints(points)
|
||
}
|
||
}
|
||
|
||
// 4. 发送课堂控制指令
|
||
// 发布答题
|
||
gatewayClient.issueQuiz(QuizCommand(
|
||
quizId = UUID.randomUUID().toString(),
|
||
type = QuizType.CHOICE,
|
||
content = "以下哪个字有9画？",
|
||
options = listOf("春", "秋", "冬", "夏"),
|
||
correctAnswer = "A",
|
||
durationSeconds = 60
|
||
))
|
||
|
||
// 收卷
|
||
gatewayClient.collectQuiz(quizId = "xxx")
|
||
|
||
// 暂停课堂（暂停笔迹推送）
|
||
gatewayClient.pauseSession()
|
||
|
||
// 恢复课堂
|
||
gatewayClient.resumeSession()
|
||
|
||
// 5. 获取教室内在线学生列表
|
||
val students = gatewayClient.getOnlineStudents()
|
||
|
||
// 6. 接收课堂事件（答题提交、学生上下线等）
|
||
gatewayClient.classroomEventFlow.collect { event ->
|
||
when (event) {
|
||
is ClassroomEvent.StudentJoined -> updateStudentList(event.student)
|
||
is ClassroomEvent.QuizAnswerSubmitted -> updateQuizStats(event.answer)
|
||
is ClassroomEvent.StudentLeft -> removeStudentFromList(event.studentId)
|
||
}
|
||
}
|
||
```
|
||
|
||
---
|
||
|
||
### 3.5 Cloud SDK 模块
|
||
|
||
#### 3.5.1 模块功能描述
|
||
|
||
Cloud SDK 封装了自然写云平台的 API 接口，提供用户认证、笔迹数据上传与下载、学情查询和资源管理等功能，让第三方应用无需处理底层 HTTP 细节即可访问云平台能力。
|
||
|
||
#### 3.5.2 API 规范
|
||
|
||
**Android（Kotlin）API：**
|
||
|
||
```kotlin
|
||
val cloudClient = WritechSDK.cloudClient
|
||
|
||
// ============ 认证模块 ============
|
||
|
||
// 1. 初始化（AppKey 签名认证）
|
||
cloudClient.init(appKey = "your_key", appSecret = "your_secret")
|
||
|
||
// 2. 用户登录（已有自然写账号）
|
||
val loginResult = cloudClient.auth.login(
|
||
username = "student_001",
|
||
password = "password123"
|
||
)
|
||
// loginResult.token → JWT Token（后续请求自动携带）
|
||
// loginResult.userInfo → 用户信息（角色/学校/班级等）
|
||
|
||
// 3. SSO 集成（第三方系统已有账号体系）
|
||
val ssoResult = cloudClient.auth.ssoLogin(
|
||
thirdPartyToken = "your_system_token",
|
||
platform = "your_platform_id"
|
||
)
|
||
|
||
// 4. 登出
|
||
cloudClient.auth.logout()
|
||
|
||
// ============ 数据模块 ============
|
||
|
||
// 5. 上传笔迹数据（学生完成书写后调用）
|
||
val uploadResult = cloudClient.data.uploadInk(
|
||
assignmentId = "assignment_001",
|
||
pageIndex = 0,
|
||
strokes = strokeCanvas.getAllStrokes(),
|
||
metadata = InkMetadata(
|
||
studentId = "student_001",
|
||
penId = penManager.connectedPen?.serialNumber,
|
||
writingDuration = 120_000L // 书写时长（毫秒）
|
||
)
|
||
)
|
||
// uploadResult.inkId → 云平台分配的笔迹ID（用于后续查询）
|
||
|
||
// 6. 下载笔迹数据
|
||
val strokes = cloudClient.data.downloadInk(inkId = "ink_001")
|
||
strokeCanvas.drawStrokes(strokes)
|
||
|
||
// 7. 提交作业
|
||
val submitResult = cloudClient.data.submitAssignment(
|
||
assignmentId = "assignment_001",
|
||
inkIds = listOf("ink_001", "ink_002") // 多页笔迹
|
||
)
|
||
|
||
// ============ 学情模块 ============
|
||
|
||
// 8. 获取学生学情报告
|
||
val report = cloudClient.report.getStudentReport(
|
||
studentId = "student_001",
|
||
startDate = "2024-03-01",
|
||
endDate = "2024-03-31"
|
||
)
|
||
// report.totalPracticeTime → 练字总时长
|
||
// report.averageScore → 平均分
|
||
// report.masteredCharacters → 已掌握汉字列表
|
||
// report.weakPoints → 薄弱知识点
|
||
|
||
// 9. 获取班级学情概览
|
||
val classReport = cloudClient.report.getClassReport(
|
||
classId = "class_001",
|
||
assignmentId = "assignment_001"
|
||
)
|
||
// classReport.submissionRate → 提交率
|
||
// classReport.averageScore → 班级平均分
|
||
// classReport.scoreDistribution → 分数段分布
|
||
|
||
// ============ 资源模块 ============
|
||
|
||
// 10. 获取字帖列表
|
||
val templates = cloudClient.resource.getCalligraphyTemplates(
|
||
grade = "grade_3",
|
||
subject = "chinese"
|
||
)
|
||
|
||
// 11. 下载字帖内容
|
||
val template = cloudClient.resource.downloadCalligraphy(templateId = "template_001")
|
||
```
|
||
|
||
**TypeScript（Web）API：**
|
||
|
||
```typescript
|
||
const cloudClient = WritechSDK.cloudClient;
|
||
|
||
// 初始化
|
||
cloudClient.init({ appKey: 'your_key', appSecret: 'your_secret' });
|
||
|
||
// 用户登录
|
||
const { token, userInfo } = await cloudClient.auth.login({
|
||
username: 'student_001',
|
||
password: 'password123',
|
||
});
|
||
|
||
// 上传笔迹
|
||
const { inkId } = await cloudClient.data.uploadInk({
|
||
assignmentId: 'assignment_001',
|
||
pageIndex: 0,
|
||
strokes: strokeCanvas.getAllStrokes(),
|
||
});
|
||
|
||
// 获取学情报告
|
||
const report = await cloudClient.report.getStudentReport({
|
||
studentId: 'student_001',
|
||
startDate: '2024-03-01',
|
||
endDate: '2024-03-31',
|
||
});
|
||
console.log('练字时长：', report.totalPracticeTime, '分钟');
|
||
```
|
||
|
||
---
|
||
|
||
### 3.6 UI Component 模块
|
||
|
||
#### 3.6.1 模块功能描述
|
||
|
||
UI Component 模块提供一组预制的 UI 控件，帮助第三方开发者快速构建智慧书写相关的界面，无需自行开发复杂的笔迹渲染控件和答题卡控件。
|
||
|
||
**预制组件列表：**
|
||
|
||
| 组件名称 | 平台 | 功能描述 |
|
||
|---------|------|---------|
|
||
| InkCanvasView | Android/iOS/Web | 笔迹书写画布（集成 PenConnect + StrokeRender） |
|
||
| StrokeReplayView | Android/iOS/Web | 笔迹回放控件（含播放/暂停/进度条） |
|
||
| CalligraphyView | Android/iOS/Web | 字帖练习控件（参考字+书写区+笔顺指导） |
|
||
| QuizAnswerCard | Android/iOS/Web | 答题卡控件（选择题/判断题/书写题） |
|
||
| BatteryIndicator | Android/iOS | 点阵笔电量指示控件 |
|
||
| PenScanDialog | Android/iOS | 点阵笔扫描连接对话框 |
|
||
|
||
#### 3.6.2 InkCanvasView 使用示例
|
||
|
||
**Android（XML 布局）：**
|
||
|
||
```xml
|
||
<!-- activity_main.xml -->
|
||
<com.writech.sdk.ui.InkCanvasView
|
||
android:id="@+id/inkCanvas"
|
||
android:layout_width="match_parent"
|
||
android:layout_height="match_parent"
|
||
app:defaultColor="@color/black"
|
||
app:defaultWidth="4dp"
|
||
app:enablePressure="true"
|
||
app:enableTaper="true"
|
||
app:backgroundColor="@color/white" />
|
||
```
|
||
|
||
```kotlin
|
||
// MainActivity.kt
|
||
val inkCanvas = binding.inkCanvas
|
||
|
||
// 绑定 PenManager（自动接收 BLE 笔迹）
|
||
inkCanvas.bindPenManager(penManager)
|
||
|
||
// 设置工具
|
||
inkCanvas.setTool(DrawingTool.PEN)
|
||
inkCanvas.setPenColor(Color.BLACK)
|
||
|
||
// 保存笔迹
|
||
val strokes = inkCanvas.getAllStrokes()
|
||
|
||
// 清除
|
||
inkCanvas.clear()
|
||
|
||
// 撤销
|
||
inkCanvas.undo()
|
||
```
|
||
|
||
**Web（HTML）：**
|
||
|
||
```html
|
||
<!-- 使用自定义 Web Component -->
|
||
<writech-ink-canvas
|
||
id="inkCanvas"
|
||
default-color="#000000"
|
||
default-width="4"
|
||
enable-pressure="true"
|
||
style="width: 100%; height: 500px; border: 1px solid #ccc;">
|
||
</writech-ink-canvas>
|
||
```
|
||
|
||
```typescript
|
||
const inkCanvas = document.getElementById('inkCanvas') as WritechInkCanvasElement;
|
||
inkCanvas.bindPenManager(penManager);
|
||
|
||
// 监听书写事件
|
||
inkCanvas.addEventListener('stroke-end', (e: CustomEvent) => {
|
||
const stroke: StrokePath = e.detail;
|
||
console.log('新笔画', stroke.points.length, '个点');
|
||
});
|
||
```
|
||
|
||
#### 3.6.3 CalligraphyView 使用示例
|
||
|
||
```kotlin
|
||
// Android（Kotlin）
|
||
val calligraphyView = binding.calligraphyView
|
||
|
||
// 加载字帖模板
|
||
calligraphyView.loadTemplate(template) // CalligraphyTemplate 对象
|
||
|
||
// 绑定笔迹输入
|
||
calligraphyView.bindPenManager(penManager)
|
||
|
||
// 监听评分结果（完成一字时触发）
|
||
calligraphyView.onScoreListener = { result ->
|
||
showScoreDialog(result.score, result.errorDetails)
|
||
}
|
||
|
||
// 设置练习模式
|
||
calligraphyView.setMode(CalligraphyMode.STROKE_ORDER) // 笔顺模式
|
||
calligraphyView.setMode(CalligraphyMode.FREE_WRITE) // 自由书写模式
|
||
calligraphyView.setMode(CalligraphyMode.TRACE_OVER) // 描红模式
|
||
```
|
||
|
||
---
|
||
|
||
## 第四章 操作流程与使用步骤
|
||
|
||
### 4.1 Android 集成步骤
|
||
|
||
#### 4.1.1 引入依赖
|
||
|
||
在项目 `build.gradle` 中配置 Maven 仓库：
|
||
|
||
```groovy
|
||
// build.gradle（Project level）
|
||
repositories {
|
||
maven { url 'https://repo.writech.com/android' }
|
||
}
|
||
```
|
||
|
||
在模块 `build.gradle` 中引入 SDK：
|
||
|
||
```groovy
|
||
// build.gradle（Module level）
|
||
dependencies {
|
||
// 核心模块（必须）
|
||
implementation 'com.writech.sdk:pen-connect:1.0.0'
|
||
implementation 'com.writech.sdk:stroke-render:1.0.0'
|
||
|
||
// 可选模块（按需引入）
|
||
implementation 'com.writech.sdk:ocr:1.0.0'
|
||
implementation 'com.writech.sdk:gateway:1.0.0'
|
||
implementation 'com.writech.sdk:cloud:1.0.0'
|
||
implementation 'com.writech.sdk:ui-component:1.0.0'
|
||
}
|
||
```
|
||
|
||
#### 4.1.2 AndroidManifest 配置
|
||
|
||
```xml
|
||
<!-- AndroidManifest.xml -->
|
||
<uses-permission android:name="android.permission.BLUETOOTH_SCAN"
|
||
android:usesPermissionFlags="neverForLocation" />
|
||
<uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />
|
||
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
|
||
<uses-permission android:name="android.permission.INTERNET" />
|
||
<uses-feature android:name="android.hardware.bluetooth_le" android:required="true" />
|
||
```
|
||
|
||
#### 4.1.3 初始化
|
||
|
||
```kotlin
|
||
// MyApplication.kt（Application 类中初始化）
|
||
class MyApplication : Application() {
|
||
override fun onCreate() {
|
||
super.onCreate()
|
||
WritechSDK.init(
|
||
context = this,
|
||
config = SDKConfig.Builder()
|
||
.appKey("your_app_key")
|
||
.appSecret("your_app_secret")
|
||
.serverUrl("https://api.writech.com") // 可配置私有化部署地址
|
||
.logLevel(if (BuildConfig.DEBUG) LogLevel.DEBUG else LogLevel.ERROR)
|
||
.build()
|
||
)
|
||
}
|
||
}
|
||
```
|
||
|
||
### 4.2 iOS 集成步骤
|
||
|
||
#### 4.2.1 CocoaPods 集成
|
||
|
||
在 `Podfile` 中添加：
|
||
|
||
```ruby
|
||
# Podfile
|
||
target 'YourApp' do
|
||
use_frameworks!
|
||
pod 'WritechSDKPenConnect', '~> 1.0'
|
||
pod 'WritechSDKStrokeRender', '~> 1.0'
|
||
pod 'WritechSDKOCR', '~> 1.0' # 可选
|
||
pod 'WritechSDKCloud', '~> 1.0' # 可选
|
||
pod 'WritechSDKUI', '~> 1.0' # 可选
|
||
end
|
||
```
|
||
|
||
执行 `pod install`。
|
||
|
||
#### 4.2.2 Info.plist 配置
|
||
|
||
```xml
|
||
<!-- Info.plist -->
|
||
<key>NSBluetoothAlwaysUsageDescription</key>
|
||
<string>需要访问蓝牙以连接自然写点阵笔</string>
|
||
<key>NSLocalNetworkUsageDescription</key>
|
||
<string>需要访问局域网以连接教室网关</string>
|
||
```
|
||
|
||
#### 4.2.3 初始化
|
||
|
||
```swift
|
||
// AppDelegate.swift
|
||
import WritechSDKPenConnect
|
||
import WritechSDKStrokeRender
|
||
|
||
@UIApplicationMain
|
||
class AppDelegate: UIResponder, UIApplicationDelegate {
|
||
func application(_ application: UIApplication,
|
||
didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
|
||
WritechSDK.shared.initialize(
|
||
config: SDKConfig(
|
||
appKey: "your_app_key",
|
||
appSecret: "your_app_secret",
|
||
serverUrl: "https://api.writech.com",
|
||
logLevel: ProcessInfo.processInfo.environment["DEBUG"] != nil ? .debug : .error
|
||
)
|
||
)
|
||
return true
|
||
}
|
||
}
|
||
```
|
||
|
||
### 4.3 PC（Windows/macOS/Linux）集成步骤
|
||
|
||
#### 4.3.1 CMake 集成
|
||
|
||
```cmake
|
||
# CMakeLists.txt
|
||
find_package(WritechSDK 1.0 REQUIRED
|
||
COMPONENTS PenConnect StrokeRender OCR Cloud)
|
||
|
||
target_link_libraries(YourApp PRIVATE
|
||
WritechSDK::PenConnect
|
||
WritechSDK::StrokeRender
|
||
WritechSDK::OCR
|
||
WritechSDK::Cloud
|
||
)
|
||
```
|
||
|
||
#### 4.3.2 初始化（C++ API）
|
||
|
||
```cpp
|
||
#include <writech/sdk.h>
|
||
|
||
int main() {
|
||
writech::SDKConfig config;
|
||
config.app_key = "your_app_key";
|
||
config.app_secret = "your_app_secret";
|
||
config.server_url = "https://api.writech.com";
|
||
config.log_level = 3; // INFO
|
||
|
||
writech::SDK::init(config);
|
||
|
||
auto& penManager = writech::SDK::penManager();
|
||
|
||
// 注册笔迹回调
|
||
penManager.setInkCallback([](const std::vector<writech::InkPoint>& points) {
|
||
// 处理笔迹数据
|
||
for (const auto& p : points) {
|
||
printf("Point: x=%.3f y=%.3f pressure=%.3f\n", p.x, p.y, p.pressure);
|
||
}
|
||
});
|
||
|
||
penManager.startScan(15000); // 扫描15秒
|
||
|
||
// 主循环
|
||
while (running) {
|
||
penManager.update(); // PC 模式需主动轮询
|
||
std::this_thread::sleep_for(std::chrono::milliseconds(16));
|
||
}
|
||
|
||
writech::SDK::release();
|
||
return 0;
|
||
}
|
||
```
|
||
|
||
### 4.4 Web（JavaScript/TypeScript）集成步骤
|
||
|
||
#### 4.4.1 NPM 安装
|
||
|
||
```bash
|
||
npm install @writech/sdk
|
||
# 或使用 yarn
|
||
yarn add @writech/sdk
|
||
```
|
||
|
||
#### 4.4.2 初始化（TypeScript）
|
||
|
||
```typescript
|
||
// main.ts
|
||
import { WritechSDK } from '@writech/sdk';
|
||
|
||
async function initWritechSDK() {
|
||
// WASM 模块异步加载（必须在使用前 await）
|
||
await WritechSDK.init({
|
||
appKey: 'your_app_key',
|
||
appSecret: 'your_app_secret',
|
||
serverUrl: 'https://api.writech.com',
|
||
});
|
||
|
||
console.log('自然写SDK初始化完成，版本：', WritechSDK.version);
|
||
}
|
||
|
||
initWritechSDK().catch(console.error);
|
||
```
|
||
|
||
#### 4.4.3 Web Bluetooth 注意事项
|
||
|
||
```typescript
|
||
// Web Bluetooth API 要求：
|
||
// 1. 必须在 HTTPS 环境下使用（localhost 除外）
|
||
// 2. 必须由用户手势（click 事件）触发 requestDevice
|
||
|
||
document.getElementById('connectBtn')!.addEventListener('click', async () => {
|
||
try {
|
||
const device = await WritechSDK.penManager.requestPen();
|
||
await WritechSDK.penManager.connect(device);
|
||
console.log('连接成功：', device.deviceName);
|
||
} catch (err) {
|
||
if ((err as Error).name === 'NotFoundError') {
|
||
console.log('用户取消了设备选择');
|
||
} else {
|
||
console.error('连接失败：', err);
|
||
}
|
||
}
|
||
});
|
||
```
|
||
|
||
### 4.5 初始化与鉴权
|
||
|
||
**AppKey 和 AppSecret 获取：**
|
||
1. 访问自然写开发者门户（https://dev.writech.com）
|
||
2. 注册开发者账号并创建应用
|
||
3. 在应用详情页获取 AppKey 和 AppSecret
|
||
4. AppSecret 仅显示一次，请妥善保存（可重新生成）
|
||
|
||
**注意事项：**
|
||
- AppKey 可以内嵌在客户端代码中（公开标识）
|
||
- AppSecret 用于请求签名，移动端/Web 端建议通过代理服务器签名，不要直接内嵌在客户端
|
||
- 生产环境和测试环境使用不同的 AppKey/AppSecret
|
||
|
||
### 4.6 完整集成示例
|
||
|
||
**Android 最小可运行示例（从零实现手写识别）：**
|
||
|
||
```kotlin
|
||
class HandwritingActivity : AppCompatActivity() {
|
||
|
||
private val penManager by lazy { WritechSDK.penManager }
|
||
private val ocrEngine by lazy { WritechSDK.ocrEngine }
|
||
|
||
override fun onCreate(savedInstanceState: Bundle?) {
|
||
super.onCreate(savedInstanceState)
|
||
setContentView(R.layout.activity_handwriting)
|
||
|
||
// 步骤1：绑定笔迹画布到 View
|
||
val inkCanvas = binding.inkCanvas
|
||
inkCanvas.bindPenManager(penManager)
|
||
|
||
// 步骤2：请求 BLE 权限并开始扫描
|
||
requestBlePermissions {
|
||
penManager.startScan(10_000).launchIn(lifecycleScope)
|
||
}
|
||
|
||
// 步骤3：连接第一个发现的笔
|
||
penManager.startScan()
|
||
.take(1)
|
||
.onEach { device -> penManager.connect(device) }
|
||
.launchIn(lifecycleScope)
|
||
|
||
// 步骤4：点击"识别"按钮调用 OCR
|
||
binding.btnRecognize.setOnClickListener {
|
||
lifecycleScope.launch {
|
||
val result = ocrEngine.recognizeText(inkCanvas.getAllStrokes())
|
||
binding.tvResult.text = "识别结果：${result.text}（置信度 ${(result.confidence * 100).toInt()}%）"
|
||
}
|
||
}
|
||
|
||
// 步骤5：清除画布
|
||
binding.btnClear.setOnClickListener { inkCanvas.clear() }
|
||
}
|
||
|
||
override fun onDestroy() {
|
||
super.onDestroy()
|
||
penManager.release()
|
||
}
|
||
}
|
||
```
|
||
|
||
### 4.7 错误码与异常处理
|
||
|
||
**SDK 统一错误码定义：**
|
||
|
||
| 错误码范围 | 错误类别 |
|
||
|---------|---------|
|
||
| 1000~1099 | SDK 初始化错误 |
|
||
| 2000~2099 | PenConnect 连接错误 |
|
||
| 3000~3099 | StrokeRender 渲染错误 |
|
||
| 4000~4099 | OCR 识别错误 |
|
||
| 5000~5099 | Gateway 连接错误 |
|
||
| 6000~6099 | Cloud API 错误 |
|
||
| 9000~9099 | 通用错误（网络/权限/存储） |
|
||
|
||
**常见错误码说明：**
|
||
|
||
| 错误码 | 名称 | 说明 | 处理建议 |
|
||
|-------|------|------|---------|
|
||
| 1001 | SDK_NOT_INITIALIZED | SDK 未初始化 | 调用 `WritechSDK.init()` 后再使用 |
|
||
| 1002 | INVALID_APP_KEY | AppKey 无效 | 检查 AppKey 是否正确，是否已激活 |
|
||
| 2001 | BLE_NOT_SUPPORTED | 设备不支持 BLE | 提示用户设备不兼容 |
|
||
| 2002 | BLE_PERMISSION_DENIED | 蓝牙权限被拒绝 | 引导用户在系统设置中开启蓝牙权限 |
|
||
| 2003 | PEN_NOT_FOUND | 未发现点阵笔 | 提示用户打开点阵笔电源，检查蓝牙是否开启 |
|
||
| 2004 | CONNECTION_TIMEOUT | 连接超时 | 重试连接，或让用户重新打开点阵笔 |
|
||
| 4001 | OCR_STROKE_TOO_SHORT | 笔迹数据太少 | 引导用户书写更多内容后再识别 |
|
||
| 4002 | OCR_QUOTA_EXCEEDED | 识别次数超出配额 | 购买更多配额，或开启本地识别 |
|
||
| 6001 | NETWORK_ERROR | 网络请求失败 | 检查网络连接，重试请求 |
|
||
| 6002 | UNAUTHORIZED | 认证失败/Token 过期 | 重新登录获取新 Token |
|
||
| 6003 | SERVER_ERROR | 服务器内部错误 | 稍后重试，如持续出现联系技术支持 |
|
||
|
||
**Android 异常处理示例：**
|
||
|
||
```kotlin
|
||
lifecycleScope.launch {
|
||
try {
|
||
val result = ocrEngine.recognizeText(strokes)
|
||
showResult(result)
|
||
} catch (e: WritechSDKException) {
|
||
when (e.code) {
|
||
ErrorCode.OCR_STROKE_TOO_SHORT -> showToast("书写内容太少，请多写一些再识别")
|
||
ErrorCode.OCR_QUOTA_EXCEEDED -> showToast("识别次数已用完，请联系管理员")
|
||
ErrorCode.NETWORK_ERROR -> showToast("网络连接失败，请检查网络")
|
||
else -> showToast("识别失败：${e.message}（错误码：${e.code}）")
|
||
}
|
||
}
|
||
}
|
||
```
|
||
|
||
---
|
||
|
||
## 第五章 与源代码的对应关系
|
||
|
||
### 5.1 模块名称与源代码文件对应表
|
||
|
||
| SDK 模块 | 源代码文件/目录 | 主要类/函数 |
|
||
|---------|--------------|-----------|
|
||
| C++ 核心引擎 | `core/include/writech_types.h` | 数据结构定义 |
|
||
| BLE 协议解析 | `core/src/ble_parser.cpp` | `writech::BleParser` |
|
||
| 笔迹平滑算法 | `core/src/stroke_smooth.cpp` | `writech::StrokeSmooth` |
|
||
| 坐标变换 | `core/src/coord_trans.cpp` | `writech::CoordTransform` |
|
||
| 数据编解码 | `core/src/data_codec.cpp` | `writech::DataCodec` |
|
||
| Android JNI 桥接 | `android/jni/pen_connect_jni.cpp` | JNI 导出函数 |
|
||
| Android JNI 桥接 | `android/jni/stroke_render_jni.cpp` | JNI 导出函数 |
|
||
| Android PenConnect | `android/src/PenManager.kt` | `PenManager` |
|
||
| Android BLE 扫描 | `android/src/BleScanner.kt` | `BleScanner` |
|
||
| Android 数据解析 | `android/src/InkFrameParser.kt` | `InkFrameParser` |
|
||
| Android StrokeRender | `android/src/StrokeCanvas.kt` | `StrokeCanvas` |
|
||
| Android OCR | `android/src/OcrEngine.kt` | `OcrEngine` |
|
||
| Android Gateway | `android/src/GatewayClient.kt` | `GatewayClient` |
|
||
| Android Cloud | `android/src/CloudClient.kt` | `CloudClient` |
|
||
| Android Cloud Auth | `android/src/AuthManager.kt` | `AuthManager` |
|
||
| Android UI - InkCanvas | `android/ui/InkCanvasView.kt` | `InkCanvasView` |
|
||
| Android UI - Calligraphy | `android/ui/CalligraphyView.kt` | `CalligraphyView` |
|
||
| Android UI - QuizCard | `android/ui/QuizAnswerCard.kt` | `QuizAnswerCard` |
|
||
| iOS Swift Bridge | `ios/Sources/PenConnectBridge.swift` | `WritechPenEngine` |
|
||
| iOS PenManager | `ios/Sources/PenManager.swift` | `PenManager` |
|
||
| iOS StrokeCanvas | `ios/Sources/StrokeCanvas.swift` | `StrokeCanvas` |
|
||
| iOS OCR | `ios/Sources/OcrEngine.swift` | `OcrEngine` |
|
||
| iOS Cloud | `ios/Sources/CloudClient.swift` | `CloudClient` |
|
||
| Web WASM Bridge | `web/src/wasm-bridge.ts` | `processBleBytes()` |
|
||
| Web PenManager | `web/src/pen-manager.ts` | `PenManager` |
|
||
| Web StrokeCanvas | `web/src/stroke-canvas.ts` | `StrokeCanvas` |
|
||
| Web OCR | `web/src/ocr-engine.ts` | `OcrEngine` |
|
||
| Web Cloud | `web/src/cloud-client.ts` | `CloudClient` |
|
||
| Web UI Components | `web/src/components/` | Web Components |
|
||
|
||
### 5.2 核心功能类与方法说明
|
||
|
||
#### PenManager 类（Android Kotlin）
|
||
|
||
```kotlin
|
||
/**
|
||
* 点阵笔连接管理器
|
||
* 提供点阵笔扫描、连接、笔迹数据接收和状态管理能力。
|
||
* 通过 WritechSDK.penManager 获取单例。
|
||
*/
|
||
class PenManager internal constructor(context: Context) {
|
||
|
||
/**
|
||
* 扫描周围自然写点阵笔（冷流，每次 collect 时触发新的扫描）
|
||
* @param timeoutMs 扫描超时毫秒数（超时后自动停止）
|
||
* @return 发现的笔设备 Flow（按发现时间顺序发出）
|
||
*/
|
||
fun startScan(timeoutMs: Long = 15_000): Flow<PenDevice>
|
||
|
||
/**
|
||
* 停止扫描（调用后 startScan Flow 完成）
|
||
*/
|
||
fun stopScan()
|
||
|
||
/**
|
||
* 连接指定点阵笔
|
||
* 连接成功后自动订阅笔迹 Notify Characteristic
|
||
* @param device 要连接的 PenDevice（来自 startScan）
|
||
*/
|
||
suspend fun connect(device: PenDevice)
|
||
|
||
/**
|
||
* 同时连接多支笔（最多4支，通过 penId 区分数据来源）
|
||
*/
|
||
suspend fun connectMultiple(devices: List<PenDevice>)
|
||
|
||
/**
|
||
* 断开当前所有连接
|
||
*/
|
||
suspend fun disconnect()
|
||
|
||
/**
|
||
* 笔迹数据热流
|
||
* 连接后持续发出笔迹点批次，每批次 1~34 个 InkPoint
|
||
* 在连接状态下持续活跃，断线后暂停，重连后自动恢复
|
||
*/
|
||
val inkDataFlow: SharedFlow<List<InkPoint>>
|
||
|
||
/**
|
||
* 连接状态热流
|
||
*/
|
||
val connectionStateFlow: StateFlow<PenConnectionState>
|
||
|
||
/**
|
||
* 当前已连接的笔（首支，如连接多笔则返回主笔）
|
||
*/
|
||
val connectedPen: PenDevice?
|
||
|
||
/**
|
||
* 当前已连接的所有笔列表
|
||
*/
|
||
val connectedPens: List<PenDevice>
|
||
|
||
/**
|
||
* 读取指定笔的电量
|
||
* @param device 目标笔（默认使用 connectedPen）
|
||
* @return 电量百分比 [0, 100]，读取失败返回 -1
|
||
*/
|
||
suspend fun getBatteryLevel(device: PenDevice? = connectedPen): Int
|
||
|
||
/**
|
||
* 释放所有资源（断开连接、清理线程）
|
||
* 应在 Activity.onDestroy() 或 ViewModel.onCleared() 中调用
|
||
*/
|
||
fun release()
|
||
}
|
||
```
|
||
|
||
#### OcrEngine 类（Android Kotlin）
|
||
|
||
```kotlin
|
||
/**
|
||
* 手写识别引擎
|
||
* 提供云端手写文字、数学公式识别和笔顺评分能力。
|
||
* 通过 WritechSDK.ocrEngine 获取单例。
|
||
*/
|
||
class OcrEngine internal constructor() {
|
||
|
||
/**
|
||
* 识别手写文字（调用云端 AI 识别）
|
||
* @param strokes 手写笔迹数据（来自 StrokeCanvas.getAllStrokes()）
|
||
* @param options 识别选项（语言、候选字数量、上下文提示）
|
||
* @return 识别结果（含最优文字、置信度、候选列表）
|
||
* @throws WritechSDKException 网络失败/配额超出时抛出
|
||
*/
|
||
suspend fun recognizeText(
|
||
strokes: List<StrokePath>,
|
||
options: TextOCROptions = TextOCROptions()
|
||
): TextRecognitionResult
|
||
|
||
/**
|
||
* 识别手写数学表达式
|
||
* @param strokes 手写数学表达式笔迹
|
||
* @param options 识别选项（年级提示、是否返回 LaTeX）
|
||
*/
|
||
suspend fun recognizeMath(
|
||
strokes: List<StrokePath>,
|
||
options: MathOCROptions = MathOCROptions()
|
||
): MathRecognitionResult
|
||
|
||
/**
|
||
* 评估汉字书写笔顺
|
||
* @param character 目标汉字（单字）
|
||
* @param strokes 学生书写的笔画序列
|
||
* @param strict 严格模式（仅接受完全正确的笔顺）
|
||
* @return 评分结果（综合分、各维度分、错误详情）
|
||
*/
|
||
suspend fun evaluateStrokeOrder(
|
||
character: String,
|
||
strokes: List<StrokePath>,
|
||
strict: Boolean = false
|
||
): StrokeOrderResult
|
||
|
||
/**
|
||
* 批量识别（一次网络请求完成多项识别，减少延迟）
|
||
* @param items 批量识别项目列表（最多20条）
|
||
*/
|
||
suspend fun recognizeBatch(items: List<BatchItem>): List<RecognitionResult>
|
||
|
||
/**
|
||
* 使用本地离线 OCR 识别文字（需本地识别授权）
|
||
*/
|
||
suspend fun recognizeTextLocal(strokes: List<StrokePath>): TextRecognitionResult
|
||
}
|
||
```
|
||
|
||
### 5.3 主要类命名规范
|
||
|
||
| 类型 | 命名规范（Android/Kotlin） | 命名规范（iOS/Swift） | 命名规范（TypeScript） |
|
||
|------|--------------------------|---------------------|----------------------|
|
||
| 管理器类 | `{功能}Manager` | `{功能}Manager` | `{功能}Manager` |
|
||
| 引擎类 | `{功能}Engine` | `{功能}Engine` | `{功能}Engine` |
|
||
| 客户端类 | `{功能}Client` | `{功能}Client` | `{功能}Client` |
|
||
| 配置类 | `{名称}Config` / `{名称}Options` | `{名称}Config` / `{名称}Options` | `{名称}Config` / `{名称}Options` |
|
||
| 数据类 | `{名称}`（Kotlin data class） | `{名称}`（Swift struct） | `interface {名称}` |
|
||
| 枚举 | `{名称}` : Enum | `{名称}` : enum | `enum {名称}` |
|
||
| 异常类 | `WritechSDKException` | `WritechSDKError` | `WritechSDKError` |
|
||
| UI 控件（Android） | `{功能}View` | `{功能}View` | `writech-{功能}` |
|
||
| JNI 桥接类（Android） | `Native{功能}` | （ObjC Bridge：`Writech{功能}Native`） | （WASM 导出函数） |
|
||
| C++ 核心类 | `writech::{功能}` | `writech::{功能}` | `writech::{功能}` |
|
||
|
||
**源代码目录结构：**
|
||
|
||
```
|
||
writech-sdk/
|
||
├── core/ （C/C++ 跨平台核心引擎）
|
||
│ ├── include/
|
||
│ │ └── writech_types.h （数据结构定义）
|
||
│ └── src/
|
||
│ ├── ble_parser.cpp （BLE 协议解析）
|
||
│ ├── stroke_smooth.cpp （笔迹平滑算法）
|
||
│ ├── coord_trans.cpp （坐标变换）
|
||
│ └── data_codec.cpp （数据编解码）
|
||
├── android/ （Android AAR）
|
||
│ ├── jni/ （JNI 桥接 C++ 代码）
|
||
│ └── src/ （Kotlin 业务层）
|
||
│ ├── PenManager.kt
|
||
│ ├── StrokeCanvas.kt
|
||
│ ├── OcrEngine.kt
|
||
│ ├── GatewayClient.kt
|
||
│ ├── CloudClient.kt
|
||
│ └── ui/ （UI 组件）
|
||
├── ios/ （iOS XCFramework）
|
||
│ └── Sources/ （Swift 源代码）
|
||
│ ├── PenManager.swift
|
||
│ ├── StrokeCanvas.swift
|
||
│ ├── OcrEngine.swift
|
||
│ └── CloudClient.swift
|
||
├── web/ （NPM 包）
|
||
│ └── src/
|
||
│ ├── wasm-bridge.ts （WASM 桥接）
|
||
│ ├── pen-manager.ts
|
||
│ ├── stroke-canvas.ts
|
||
│ ├── ocr-engine.ts
|
||
│ ├── cloud-client.ts
|
||
│ └── components/ （Web Components）
|
||
└── examples/ （各平台集成示例工程）
|
||
├── android-sample/
|
||
├── ios-sample/
|
||
├── electron-sample/
|
||
└── web-sample/
|
||
```
|
||
|
||
---
|
||
|
||
## 附录
|
||
|
||
### A. 术语表
|
||
|
||
| 术语 | 说明 |
|
||
|------|------|
|
||
| SDK | Software Development Kit，软件开发工具包 |
|
||
| AppKey | 应用标识符，用于标识接入方的应用，可公开 |
|
||
| AppSecret | 应用密钥，用于请求签名认证，需保密 |
|
||
| JNI | Java Native Interface，Java 调用 C/C++ 原生代码的接口 |
|
||
| ObjC Bridge | Objective-C 桥接层，iOS 中 Swift 调用 C++ 的中间层 |
|
||
| FFI | Foreign Function Interface，跨语言函数调用接口 |
|
||
| WASM | WebAssembly，高性能 Web 二进制代码格式 |
|
||
| Emscripten | 将 C/C++ 代码编译为 WASM/JS 的工具链 |
|
||
| BLE GATT | Generic Attribute Profile，BLE 上层协议，定义服务和特征 |
|
||
| Characteristic | GATT 中的数据单元，对应笔迹数据的具体通信通道 |
|
||
| Notify | GATT Characteristic 属性，服务端主动推送数据到客户端 |
|
||
| MTU | Maximum Transmission Unit，BLE 单包最大字节数（默认23，协商后最大247） |
|
||
| Delta 编码 | 差分编码，存储相邻值之差而非绝对值，减少数据量 |
|
||
| CRC32 | 32位循环冗余校验，用于数据完整性验证 |
|
||
| HMAC-SHA256 | 基于哈希的消息认证码，使用 SHA256 算法，用于 API 签名 |
|
||
| ProGuard / R8 | Android 代码混淆工具，防止逆向分析 |
|
||
| Keychain | iOS 系统安全凭证存储 |
|
||
| EncryptedSharedPreferences | Android 加密偏好存储 |
|
||
| SemVer | Semantic Versioning，语义化版本号（MAJOR.MINOR.PATCH） |
|
||
| Web Component | W3C 标准的自定义 HTML 元素规范 |
|
||
| Coroutine | Kotlin 协程，轻量级并发框架 |
|
||
| Flow | Kotlin 协程数据流，用于异步数据序列 |
|
||
| Publisher | Swift Combine 框架的数据发布者 |
|
||
| AbortController | Web API，用于取消异步操作（fetch/Web Bluetooth） |
|
||
| AAR | Android Archive，Android 库的打包格式（含代码+资源+so） |
|
||
| XCFramework | Apple 多架构 Framework 格式（含 arm64/x86_64 多个 slice） |
|
||
| Universal Binary | macOS 支持多 CPU 架构（Apple Silicon + Intel）的二进制文件 |
|
||
|
||
### B. 版本历史
|
||
|
||
| 版本 | 发布日期 | 变更内容 |
|
||
|------|---------|---------|
|
||
| V1.0.0 | 2024-06-30 | 正式版本：PenConnect / StrokeRender / OCR / Gateway / Cloud / UI Component 全模块，Android / iOS / PC / Web 全平台发布 |
|
||
| V0.9.5 | 2024-05-25 | Beta：Web WASM 模块性能优化；iOS Swift Package 支持；多笔连接稳定性修复 |
|
||
| V0.9.0 | 2024-04-20 | Beta：API 接口冻结；各平台集成测试完成 |
|
||
| V0.8.0 | 2024-03-15 | Alpha：OCR 云端识别接口；Gateway SDK 教室网关对接 |
|
||
| V0.7.0 | 2024-02-10 | Alpha：StrokeRender SDK 压感/笔锋效果完成；Web 平台（NPM 包）首次发布 |
|
||
| V0.5.0 | 2024-01-05 | 原型：PenConnect SDK（Android + iOS）基础功能验证 |
|
||
|
||
### C. API 变更记录（V1.0.0）
|
||
|
||
| API | 变更类型 | 说明 |
|
||
|-----|---------|------|
|
||
| `PenManager.scan()` | 重命名 → `startScan()` | 语义更清晰 |
|
||
| `PenManager.inkStream` | 重命名 → `inkDataFlow` | 统一 Kotlin Flow 命名规范 |
|
||
| `OcrEngine.recognize()` | 拆分 → `recognizeText()` + `recognizeMath()` | 分离不同识别类型 API |
|
||
| `SDKConfig.apiKey` | 重命名 → `appKey` | 与后端术语统一 |
|
||
| `StrokeCanvas.render()` | 删除 | 合并到 `addPoints()` 自动渲染 |
|
||
|
||
### D. 常见问题（FAQ）
|
||
|
||
**Q: SDK 是否支持私有化部署？**
|
||
A: 支持。在 `SDKConfig.serverUrl` 中配置私有化部署的服务器地址即可。OCR 功能可选配置本地识别引擎（需单独授权）。
|
||
|
||
**Q: 一个 AppKey 可以用于多个应用吗？**
|
||
A: 不可以，每个应用需要独立申请 AppKey。同一公司的不同应用需分别注册。
|
||
|
||
**Q: 离线模式下哪些功能可以使用？**
|
||
A: PenConnect SDK（BLE 笔连接和笔迹数据接收）和 StrokeRender SDK（本地渲染）可在完全离线状态下工作。OCR SDK 默认需要网络，可选购本地识别模块。Gateway SDK 和 Cloud SDK 需要网络连接。
|
||
|
||
**Q: SDK 的笔迹数据格式是否标准化，可以与其他平台互通？**
|
||
A: StrokePath 可通过 `DataCodec` 序列化为标准 JSON 格式，各平台均支持导入/导出，可在平台间传输笔迹数据。
|
||
|
||
**Q: SDK 是否会影响宿主应用的性能？**
|
||
A: SDK 的 BLE 通信和笔迹平滑算法运行在独立工作线程，不占用 UI 线程。在搭载现代 SoC 的设备上（如高通 865+、Apple A14+），SDK 的 CPU 占用率通常 < 5%。
|
||
|
||
---
|
||
|
||
*本文档版权归深圳自然写科技有限公司所有，所有技术细节与接口设计仅用于软件著作权登记鉴别，请勿用于其他商业用途。*
|
||
|
||
---
|
||
|
||
## 附录E 多平台集成详述
|
||
|
||
### E.1 iOS平台集成（XCFramework + Objective-C Bridge）
|
||
|
||
#### E.1.1 iOS集成步骤
|
||
|
||
```bash
|
||
# 安装方式一：CocoaPods
|
||
# Podfile
|
||
pod 'WritechSDK', '~> 1.0.0'
|
||
|
||
# 安装方式二：Swift Package Manager
|
||
# Package.swift dependencies
|
||
.package(url: "https://github.com/writech/writech-sdk-ios.git", from: "1.0.0")
|
||
```
|
||
|
||
#### E.1.2 Objective-C Bridge关键代码
|
||
|
||
```objc
|
||
// WritechSDK/Platforms/iOS/WritechBridge.mm
|
||
#import "WritechBridge.h"
|
||
#import "writech_sdk.h" // C++核心头文件
|
||
|
||
@implementation WritechPenBridge {
|
||
writech::PenConnectEngine* _engine;
|
||
CBCentralManager* _centralManager;
|
||
NSMutableDictionary<NSString*, CBPeripheral*>* _peripherals;
|
||
}
|
||
|
||
- (instancetype)initWithConfig:(WritechConfig*)config {
|
||
self = [super init];
|
||
if (self) {
|
||
// 初始化C++核心引擎
|
||
writech::PenConfig cppConfig;
|
||
cppConfig.app_key = [config.appKey UTF8String];
|
||
cppConfig.app_secret = [config.appSecret UTF8String];
|
||
_engine = new writech::PenConnectEngine(cppConfig);
|
||
|
||
_peripherals = [NSMutableDictionary dictionary];
|
||
_centralManager = [[CBCentralManager alloc]
|
||
initWithDelegate:self
|
||
queue:dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0)];
|
||
}
|
||
return self;
|
||
}
|
||
|
||
/**
|
||
* 开始扫描BLE智能笔（iOS CoreBluetooth）
|
||
*/
|
||
- (void)startScan {
|
||
if (_centralManager.state == CBManagerStatePoweredOn) {
|
||
CBUUID* serviceUUID = [CBUUID UUIDWithString:@"6E400001-B5A3-F393-E0A9-E50E24DCCA9E"];
|
||
[_centralManager scanForPeripheralsWithServices:@[serviceUUID]
|
||
options:@{CBCentralManagerScanOptionAllowDuplicatesKey: @NO}];
|
||
}
|
||
}
|
||
|
||
#pragma mark - CBCentralManagerDelegate
|
||
|
||
- (void)centralManager:(CBCentralManager*)central
|
||
didDiscoverPeripheral:(CBPeripheral*)peripheral
|
||
advertisementData:(NSDictionary*)advertisementData
|
||
RSSI:(NSNumber*)RSSI {
|
||
NSString* name = peripheral.name ?: @"";
|
||
if ([name hasPrefix:@"WritechPen-"]) {
|
||
_peripherals[peripheral.identifier.UUIDString] = peripheral;
|
||
if (self.onPenDiscovered) {
|
||
self.onPenDiscovered(peripheral.identifier.UUIDString, name, RSSI.intValue);
|
||
}
|
||
}
|
||
}
|
||
|
||
- (void)centralManager:(CBCentralManager*)central
|
||
didConnectPeripheral:(CBPeripheral*)peripheral {
|
||
peripheral.delegate = self;
|
||
[peripheral discoverServices:nil];
|
||
if (self.onPenConnected) {
|
||
self.onPenConnected(peripheral.identifier.UUIDString);
|
||
}
|
||
}
|
||
|
||
#pragma mark - CBPeripheralDelegate
|
||
|
||
- (void)peripheral:(CBPeripheral*)peripheral
|
||
didUpdateValueForCharacteristic:(CBCharacteristic*)characteristic
|
||
error:(NSError*)error {
|
||
if (error) return;
|
||
|
||
// 将BLE数据传递给C++引擎处理
|
||
NSData* data = characteristic.value;
|
||
if (data.length > 0) {
|
||
_engine->processBleBytes(
|
||
(const uint8_t*)data.bytes,
|
||
(size_t)data.length
|
||
);
|
||
}
|
||
}
|
||
|
||
- (void)dealloc {
|
||
delete _engine;
|
||
}
|
||
|
||
@end
|
||
```
|
||
|
||
#### E.1.3 Swift调用示例
|
||
|
||
```swift
|
||
// iOS接入示例（Swift）
|
||
import WritechSDK
|
||
|
||
class InkViewController: UIViewController {
|
||
|
||
private var penBridge: WritechPenBridge!
|
||
private var inkView: WritechInkView!
|
||
|
||
override func viewDidLoad() {
|
||
super.viewDidLoad()
|
||
|
||
// 初始化SDK
|
||
let config = WritechConfig()
|
||
config.appKey = "your-app-key"
|
||
config.appSecret = "your-app-secret"
|
||
penBridge = WritechPenBridge(config: config)
|
||
|
||
// 设置笔迹视图
|
||
inkView = WritechInkView(frame: view.bounds)
|
||
inkView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
|
||
view.addSubview(inkView)
|
||
|
||
// 监听笔迹回调
|
||
penBridge.onStrokePoint = { [weak self] point in
|
||
DispatchQueue.main.async {
|
||
self?.inkView.addPoint(point)
|
||
}
|
||
}
|
||
|
||
penBridge.onStrokeEnd = { [weak self] stroke in
|
||
DispatchQueue.main.async {
|
||
self?.inkView.endStroke()
|
||
self?.handleStrokeComplete(stroke)
|
||
}
|
||
}
|
||
|
||
// 开始扫描
|
||
penBridge.startScan()
|
||
}
|
||
|
||
private func handleStrokeComplete(_ stroke: WritechStroke) {
|
||
// 上传笔迹到云端（通过SDK Cloud模块）
|
||
WritechCloudModule.shared.uploadStroke(
|
||
stroke: stroke,
|
||
sessionId: currentSessionId,
|
||
completion: { result in
|
||
switch result {
|
||
case .success(let response):
|
||
print("Stroke uploaded: \(response.strokeId)")
|
||
case .failure(let error):
|
||
print("Upload failed: \(error)")
|
||
}
|
||
}
|
||
)
|
||
}
|
||
}
|
||
```
|
||
|
||
### E.2 Web平台集成（WebAssembly + TypeScript）
|
||
|
||
#### E.2.1 WASM模块初始化
|
||
|
||
```typescript
|
||
// writech-sdk-web/src/index.ts
|
||
import WasmModule from './wasm/writech_core.js'
|
||
|
||
let wasmInstance: any = null
|
||
let isInitialized = false
|
||
|
||
/**
|
||
* 初始化Writech SDK（WebAssembly版本）
|
||
*/
|
||
export async function initSDK(appKey: string, appSecret: string): Promise<void> {
|
||
if (isInitialized) return
|
||
|
||
wasmInstance = await WasmModule({
|
||
// 自定义内存分配（为高频笔迹数据优化）
|
||
INITIAL_MEMORY: 32 * 1024 * 1024, // 32MB
|
||
MAXIMUM_MEMORY: 128 * 1024 * 1024, // 128MB
|
||
})
|
||
|
||
// 调用WASM导出的初始化函数
|
||
const appKeyPtr = wasmInstance.allocateUTF8(appKey)
|
||
const appSecretPtr = wasmInstance.allocateUTF8(appSecret)
|
||
const result = wasmInstance._writech_init(appKeyPtr, appSecretPtr)
|
||
wasmInstance._free(appKeyPtr)
|
||
wasmInstance._free(appSecretPtr)
|
||
|
||
if (result !== 0) {
|
||
throw new Error(`SDK init failed with code: ${result}`)
|
||
}
|
||
isInitialized = true
|
||
console.log('[WritechSDK] WebAssembly module initialized')
|
||
}
|
||
|
||
/**
|
||
* 通过Web Bluetooth API连接智能笔
|
||
*/
|
||
export async function connectPen(): Promise<string> {
|
||
const device = await navigator.bluetooth.requestDevice({
|
||
filters: [{ namePrefix: 'WritechPen-' }],
|
||
optionalServices: ['6e400001-b5a3-f393-e0a9-e50e24dcca9e']
|
||
})
|
||
|
||
const server = await device.gatt!.connect()
|
||
const service = await server.getPrimaryService('6e400001-b5a3-f393-e0a9-e50e24dcca9e')
|
||
const inkChar = await service.getCharacteristic('6e400002-b5a3-f393-e0a9-e50e24dcca9e')
|
||
|
||
await inkChar.startNotifications()
|
||
inkChar.addEventListener('characteristicvaluechanged', (event: any) => {
|
||
const data = event.target.value as DataView
|
||
_processInkData(data)
|
||
})
|
||
|
||
device.addEventListener('gattserverdisconnected', () => {
|
||
console.log('[WritechSDK] Pen disconnected:', device.id)
|
||
// 自动重连
|
||
setTimeout(() => device.gatt!.connect(), 3000)
|
||
})
|
||
|
||
return device.id
|
||
}
|
||
|
||
/**
|
||
* 处理BLE笔迹数据（传递给WASM引擎）
|
||
*/
|
||
function _processInkData(data: DataView): void {
|
||
const ptr = wasmInstance._malloc(data.byteLength)
|
||
const heapBytes = new Uint8Array(wasmInstance.HEAPU8.buffer, ptr, data.byteLength)
|
||
heapBytes.set(new Uint8Array(data.buffer))
|
||
wasmInstance._writech_process_ble_data(ptr, data.byteLength)
|
||
wasmInstance._free(ptr)
|
||
}
|
||
|
||
/**
|
||
* 注册笔迹点回调
|
||
*/
|
||
export function onStrokePoint(
|
||
callback: (x: number, y: number, pressure: number, timestamp: number) => void
|
||
): void {
|
||
wasmInstance._writech_set_stroke_callback(
|
||
wasmInstance.addFunction(
|
||
(x: number, y: number, pressure: number, ts: number) => {
|
||
callback(x, y, pressure, ts)
|
||
},
|
||
'vfffi'
|
||
)
|
||
)
|
||
}
|
||
```
|
||
|
||
### E.3 Windows平台集成（DLL + C#/C++）
|
||
|
||
#### E.3.1 DLL导出函数
|
||
|
||
```cpp
|
||
// windows/writech_sdk_win.h - Windows DLL公共头文件
|
||
#pragma once
|
||
#ifdef WRITECH_SDK_EXPORTS
|
||
#define WRITECH_API __declspec(dllexport)
|
||
#else
|
||
#define WRITECH_API __declspec(dllimport)
|
||
#endif
|
||
|
||
extern "C" {
|
||
// 初始化SDK
|
||
WRITECH_API int WritechInit(const char* appKey, const char* appSecret);
|
||
|
||
// 扫描蓝牙笔（需要Windows蓝牙适配器）
|
||
WRITECH_API int WritechStartBLEScan(void);
|
||
WRITECH_API int WritechStopBLEScan(void);
|
||
|
||
// 连接指定笔
|
||
WRITECH_API int WritechConnect(const char* deviceId);
|
||
WRITECH_API int WritechDisconnect(const char* deviceId);
|
||
|
||
// 笔迹回调注册
|
||
typedef void (*StrokePointCallback)(float x, float y, float pressure, unsigned int ts);
|
||
typedef void (*StrokeEndCallback)(const unsigned char* inkData, int dataLen);
|
||
typedef void (*PenStatusCallback)(const char* deviceId, int status);
|
||
|
||
WRITECH_API void WritechSetStrokePointCallback(StrokePointCallback cb);
|
||
WRITECH_API void WritechSetStrokeEndCallback(StrokeEndCallback cb);
|
||
WRITECH_API void WritechSetPenStatusCallback(PenStatusCallback cb);
|
||
|
||
// 销毁SDK
|
||
WRITECH_API void WritechDestroy(void);
|
||
|
||
// 获取版本号
|
||
WRITECH_API const char* WritechGetVersion(void);
|
||
}
|
||
```
|
||
|
||
#### E.3.2 C# .NET集成示例
|
||
|
||
```csharp
|
||
// WritechSDK.NET/WritechNative.cs
|
||
using System;
|
||
using System.Runtime.InteropServices;
|
||
|
||
namespace Writech.SDK
|
||
{
|
||
public class WritechNative
|
||
{
|
||
private const string DLL_NAME = "WritechSDK.dll";
|
||
|
||
[DllImport(DLL_NAME, CharSet = CharSet.Ansi)]
|
||
public static extern int WritechInit(string appKey, string appSecret);
|
||
|
||
[DllImport(DLL_NAME)]
|
||
public static extern int WritechStartBLEScan();
|
||
|
||
[DllImport(DLL_NAME)]
|
||
public static extern int WritechStopBLEScan();
|
||
|
||
[DllImport(DLL_NAME, CharSet = CharSet.Ansi)]
|
||
public static extern int WritechConnect(string deviceId);
|
||
|
||
[DllImport(DLL_NAME, CharSet = CharSet.Ansi)]
|
||
public static extern int WritechDisconnect(string deviceId);
|
||
|
||
[DllImport(DLL_NAME)]
|
||
public static extern void WritechSetStrokePointCallback(StrokePointDelegate callback);
|
||
|
||
[DllImport(DLL_NAME)]
|
||
public static extern void WritechSetStrokeEndCallback(StrokeEndDelegate callback);
|
||
|
||
[DllImport(DLL_NAME, CharSet = CharSet.Ansi)]
|
||
public static extern IntPtr WritechGetVersion();
|
||
|
||
[DllImport(DLL_NAME)]
|
||
public static extern void WritechDestroy();
|
||
}
|
||
|
||
// 委托类型定义
|
||
[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
|
||
public delegate void StrokePointDelegate(float x, float y, float pressure, uint timestamp);
|
||
|
||
[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
|
||
public delegate void StrokeEndDelegate(IntPtr inkData, int dataLen);
|
||
|
||
// 高层封装
|
||
public class WritechClient : IDisposable
|
||
{
|
||
public event Action<float, float, float, uint>? OnStrokePoint;
|
||
public event Action<byte[]>? OnStrokeEnd;
|
||
|
||
private StrokePointDelegate _strokePointCb;
|
||
private StrokeEndDelegate _strokeEndCb;
|
||
|
||
public WritechClient(string appKey, string appSecret)
|
||
{
|
||
int result = WritechNative.WritechInit(appKey, appSecret);
|
||
if (result != 0)
|
||
throw new InvalidOperationException($"SDK init failed: {result}");
|
||
|
||
// 必须持有委托引用，防止GC回收
|
||
_strokePointCb = (x, y, p, ts) => OnStrokePoint?.Invoke(x, y, p, ts);
|
||
_strokeEndCb = (ptr, len) => {
|
||
byte[] data = new byte[len];
|
||
Marshal.Copy(ptr, data, 0, len);
|
||
OnStrokeEnd?.Invoke(data);
|
||
};
|
||
|
||
WritechNative.WritechSetStrokePointCallback(_strokePointCb);
|
||
WritechNative.WritechSetStrokeEndCallback(_strokeEndCb);
|
||
}
|
||
|
||
public void StartScan() => WritechNative.WritechStartBLEScan();
|
||
public void StopScan() => WritechNative.WritechStopBLEScan();
|
||
public void Connect(string deviceId) => WritechNative.WritechConnect(deviceId);
|
||
public void Disconnect(string deviceId) => WritechNative.WritechDisconnect(deviceId);
|
||
|
||
public void Dispose()
|
||
{
|
||
WritechNative.WritechDestroy();
|
||
}
|
||
}
|
||
}
|
||
```
|
||
|
||
### E.4 错误码完整列表
|
||
|
||
| 错误码 | 常量名 | 说明 | 处理建议 |
|
||
|--------|--------|------|---------|
|
||
| 0 | WRITECH_OK | 成功 | - |
|
||
| 1001 | WRITECH_ERR_INVALID_KEY | AppKey格式无效 | 检查AppKey是否为32位字符串 |
|
||
| 1002 | WRITECH_ERR_AUTH_FAILED | 认证失败（签名不匹配） | 检查AppSecret是否正确 |
|
||
| 1003 | WRITECH_ERR_EXPIRED | Token已过期 | 调用refreshToken()刷新 |
|
||
| 1004 | WRITECH_ERR_QUOTA_EXCEEDED | API调用配额超限 | 联系商务升级套餐 |
|
||
| 2001 | WRITECH_ERR_BLE_NOT_SUPPORTED | 设备不支持BLE | 提示用户设备不兼容 |
|
||
| 2002 | WRITECH_ERR_BLE_PERMISSION | BLE权限未授权 | 引导用户在系统设置授权 |
|
||
| 2003 | WRITECH_ERR_DEVICE_NOT_FOUND | 未找到指定设备 | 重新扫描或检查笔是否开启 |
|
||
| 2004 | WRITECH_ERR_CONNECT_TIMEOUT | 连接超时（10秒） | 检查笔电量和距离，重试 |
|
||
| 2005 | WRITECH_ERR_CONNECT_FAILED | 连接失败 | 重启蓝牙后重试 |
|
||
| 3001 | WRITECH_ERR_OCR_TIMEOUT | OCR识别超时 | 网络问题，已降级到端侧识别 |
|
||
| 3002 | WRITECH_ERR_OCR_LOW_QUALITY | 笔迹质量过低，无法识别 | 提示用户书写清晰 |
|
||
| 4001 | WRITECH_ERR_UPLOAD_FAILED | 笔迹上传失败 | 已加入本地队列，后台重传 |
|
||
| 4002 | WRITECH_ERR_NETWORK | 网络不可用 | 离线模式自动缓存 |
|
||
| 5001 | WRITECH_ERR_NOT_INITIALIZED | SDK未初始化 | 先调用init()方法 |
|
||
| 5002 | WRITECH_ERR_ALREADY_INITIALIZED | SDK重复初始化 | 忽略，只需初始化一次 |
|
||
|
||
---
|
||
|
||
## 附录F SDK性能与兼容性
|
||
|
||
### F.1 各平台性能基准
|
||
|
||
| 平台 | 设备 | BLE数据处理 | 笔迹渲染延迟 | OCR请求RTT | 内存占用 |
|
||
|------|------|-----------|------------|-----------|---------|
|
||
| Android | Xiaomi 13 (Snapdragon 8 Gen 2) | 0.8ms/包 | 3ms | 85ms | 22MB |
|
||
| iOS | iPhone 14 (A15) | 0.6ms/包 | 2ms | 78ms | 18MB |
|
||
| Windows | ThinkPad X1 (i7-1165G7) | 1.2ms/包 | 4ms | 90ms | 28MB |
|
||
| macOS | MacBook Air M2 | 0.5ms/包 | 1ms | 72ms | 16MB |
|
||
| Linux | Ubuntu 22.04 (i7-10700) | 1.0ms/包 | 4ms | 88ms | 24MB |
|
||
| Web | Chrome 120 (Apple M2) | 2.1ms/包 | 6ms | 95ms | 35MB |
|
||
|
||
### F.2 兼容性要求
|
||
|
||
| 平台 | 最低系统版本 | 编译器/运行时 | 最低蓝牙版本 |
|
||
|------|-----------|-------------|-----------|
|
||
| Android | Android 7.0 (API 24) | NDK r25+, compileSdk 34 | BLE 4.2 |
|
||
| iOS | iOS 13.0 | Xcode 14+, Swift 5.7+ | CoreBluetooth |
|
||
| Windows | Windows 10 1903 | MSVC 2019+, .NET 6.0+ | WinRT BLE |
|
||
| macOS | macOS 11.0 | Xcode 14+, Swift 5.7+ | CoreBluetooth |
|
||
| Linux | Ubuntu 20.04 / glibc 2.31+ | GCC 9+, cmake 3.18+ | BlueZ 5.50+ |
|
||
| Web | Chrome 85+, Edge 85+, Firefox 79+ | Node 16+ (build) | Web Bluetooth API |
|
||
|
||
### F.3 SDK版本历史
|
||
|
||
| 版本 | 日期 | 变更说明 |
|
||
|------|------|---------|
|
||
| V0.5 Beta | 2025-07-01 | 基础BLE连接、笔迹采集与渲染、Android/iOS支持 |
|
||
| V0.8 Beta | 2025-10-15 | OCR/数学识别、Windows DLL、macOS dylib支持 |
|
||
| V0.9 RC | 2025-12-20 | WASM Web支持、Linux .so、令牌桶限流、签名认证 |
|
||
| V1.0 | 2026-02-14 | 正式版：全平台稳定、完整文档、离线缓存、性能优化 |
|
||
|
||
### F.4 快速入门示例（Android Kotlin）
|
||
|
||
```kotlin
|
||
// Android快速集成示例
|
||
class InkActivity : AppCompatActivity() {
|
||
|
||
private lateinit var writechSDK: WritechSDK
|
||
private lateinit var inkSurfaceView: WritechInkView
|
||
|
||
override fun onCreate(savedInstanceState: Bundle?) {
|
||
super.onCreate(savedInstanceState)
|
||
setContentView(R.layout.activity_ink)
|
||
inkSurfaceView = findViewById(R.id.ink_view)
|
||
|
||
// 1. 初始化SDK
|
||
writechSDK = WritechSDK.init(this, WritechConfig(
|
||
appKey = BuildConfig.WRITECH_APP_KEY,
|
||
appSecret = BuildConfig.WRITECH_APP_SECRET,
|
||
))
|
||
|
||
// 2. 注册笔迹回调
|
||
writechSDK.penConnect.addStrokeListener(object : StrokeListener {
|
||
override fun onPoint(x: Float, y: Float, pressure: Float, ts: Long) {
|
||
inkSurfaceView.addPoint(x, y, pressure)
|
||
}
|
||
override fun onStrokeEnd(stroke: StrokePath) {
|
||
inkSurfaceView.endStroke()
|
||
// 可选：OCR识别
|
||
writechSDK.ocr.recognize(stroke) { result ->
|
||
Log.d("SDK", "OCR: ${result.text}")
|
||
}
|
||
}
|
||
})
|
||
|
||
// 3. 扫描并连接
|
||
writechSDK.penConnect.startScan { devices ->
|
||
if (devices.isNotEmpty()) {
|
||
writechSDK.penConnect.connect(devices[0].id)
|
||
}
|
||
}
|
||
}
|
||
|
||
override fun onDestroy() {
|
||
super.onDestroy()
|
||
writechSDK.destroy()
|
||
}
|
||
}
|
||
```
|
||
|
||
---
|
||
|
||
*本文档版权归深圳自然写科技有限公司所有，技术细节与接口设计仅用于软件著作权登记鉴别，请勿用于其他商业用途。*
|
||
|
||
---
|
||
|
||
## 附录G SDK架构总结
|
||
|
||
### G.1 C/C++核心引擎模块依赖图
|
||
|
||
```
|
||
┌─────────────────────────────────────────────────────────────────────┐
|
||
│ 应用集成层（各平台SDK） │
|
||
│ Android AAR iOS XCFramework Windows DLL macOS dylib │
|
||
│ Linux .so Web WASM+TS │
|
||
└───────────────────────────┬─────────────────────────────────────────┘
|
||
│ 平台适配层
|
||
┌───────────────────────────▼─────────────────────────────────────────┐
|
||
│ Android JNI │ iOS ObjC Bridge │ Windows C API │ WASM Emscripten │
|
||
└───────────────────────────┬─────────────────────────────────────────┘
|
||
│ C/C++ 核心引擎
|
||
┌─────────────┬─────────────┬────────────┬────────────┬────────────────┐
|
||
│ PenConnect │ StrokeRender│ OCR │ Gateway │ Cloud │
|
||
│ 蓝牙连接引擎│ 笔迹渲染引擎│ 文字识别 │ 网关通信 │ 云端同步 │
|
||
└─────────────┴─────────────┴────────────┴────────────┴────────────────┘
|
||
│ 基础库
|
||
┌─────────────┬─────────────┬────────────┬────────────┐
|
||
│ BLE协议栈 │ Crypto │ HTTP/gRPC │ SQLite │
|
||
│（平台Native）│ HMAC-SHA256│ REST客户端│ 本地缓存 │
|
||
└─────────────┴─────────────┴────────────┴────────────┘
|
||
```
|
||
|
||
### G.2 SDK文件打包结构
|
||
|
||
```
|
||
writech-sdk-android/
|
||
├── writech-sdk-1.0.0.aar # Android AAR包
|
||
└── docs/ # API文档
|
||
|
||
writech-sdk-ios/
|
||
├── WritechSDK.xcframework/ # iOS XCFramework
|
||
│ ├── ios-arm64/WritechSDK.framework
|
||
│ └── ios-arm64-simulator/WritechSDK.framework
|
||
└── WritechSDK.podspec
|
||
|
||
writech-sdk-windows/
|
||
├── bin/WritechSDK.dll # Windows动态库
|
||
├── include/writech_sdk.h # 头文件
|
||
└── lib/WritechSDK.lib # 导入库
|
||
|
||
writech-sdk-web/
|
||
├── dist/writech-sdk.js # WASM包装JS
|
||
├── dist/writech_core.wasm # WASM二进制
|
||
└── dist/writech-sdk.d.ts # TypeScript类型声明
|
||
```
|
||
|
||
---
|
||
|
||
*本文档版权归深圳自然写科技有限公司所有，技术细节仅用于软件著作权登记鉴别。*
|
||
|
||
---
|
||
|
||
## 附录H 补充集成示例与高级用法
|
||
|
||
### H.1 React Native集成示例
|
||
|
||
```javascript
|
||
// WritechSDKModule.js - React Native桥接模块
|
||
import { NativeModules, NativeEventEmitter } from 'react-native';
|
||
|
||
const { WritechSDK } = NativeModules;
|
||
const eventEmitter = new NativeEventEmitter(WritechSDK);
|
||
|
||
class WritechSDKManager {
|
||
constructor() {
|
||
this.penSubscription = null;
|
||
this.inkSubscription = null;
|
||
}
|
||
|
||
async initialize(appKey, appSecret) {
|
||
return await WritechSDK.initialize({
|
||
appKey,
|
||
appSecret,
|
||
environment: 'production',
|
||
logLevel: 'warn'
|
||
});
|
||
}
|
||
|
||
startPenScan(onDeviceFound) {
|
||
this.penSubscription = eventEmitter.addListener(
|
||
'WritechPenFound',
|
||
(device) => onDeviceFound(device)
|
||
);
|
||
WritechSDK.startPenScan();
|
||
}
|
||
|
||
connectPen(deviceId) {
|
||
return WritechSDK.connectPen(deviceId);
|
||
}
|
||
|
||
onInkData(callback) {
|
||
this.inkSubscription = eventEmitter.addListener(
|
||
'WritechInkData',
|
||
callback
|
||
);
|
||
}
|
||
|
||
destroy() {
|
||
this.penSubscription?.remove();
|
||
this.inkSubscription?.remove();
|
||
WritechSDK.destroy();
|
||
}
|
||
}
|
||
|
||
export default new WritechSDKManager();
|
||
```
|
||
|
||
### H.2 Unity游戏引擎集成
|
||
|
||
```csharp
|
||
// WritechSDKUnity.cs - Unity C#绑定
|
||
using System;
|
||
using System.Runtime.InteropServices;
|
||
using UnityEngine;
|
||
|
||
public class WritechSDKUnity : MonoBehaviour {
|
||
|
||
#if UNITY_ANDROID
|
||
private AndroidJavaObject sdkInstance;
|
||
#elif UNITY_IOS
|
||
[DllImport("__Internal")]
|
||
private static extern IntPtr WritechSDK_Create(string appKey, string appSecret);
|
||
[DllImport("__Internal")]
|
||
private static extern void WritechSDK_StartPenScan(IntPtr handle);
|
||
[DllImport("__Internal")]
|
||
private static extern void WritechSDK_Destroy(IntPtr handle);
|
||
private IntPtr sdkHandle;
|
||
#endif
|
||
|
||
public event Action<PenDevice> OnPenFound;
|
||
public event Action<InkPoint[]> OnInkData;
|
||
|
||
void Awake() {
|
||
#if UNITY_ANDROID
|
||
using (var pluginClass = new AndroidJavaClass("com.writech.sdk.WritechSDK")) {
|
||
sdkInstance = pluginClass.CallStatic<AndroidJavaObject>("getInstance");
|
||
}
|
||
#elif UNITY_IOS
|
||
sdkHandle = WritechSDK_Create(AppKey, AppSecret);
|
||
#endif
|
||
}
|
||
|
||
public void StartPenScan() {
|
||
#if UNITY_ANDROID
|
||
sdkInstance.Call("startPenScan");
|
||
#elif UNITY_IOS
|
||
WritechSDK_StartPenScan(sdkHandle);
|
||
#endif
|
||
}
|
||
|
||
// Unity消息回调（由原生层通过UnitySendMessage调用）
|
||
public void OnNativePenFound(string json) {
|
||
var device = JsonUtility.FromJson<PenDevice>(json);
|
||
OnPenFound?.Invoke(device);
|
||
}
|
||
|
||
public void OnNativeInkData(string json) {
|
||
var data = JsonUtility.FromJson<InkDataArray>(json);
|
||
OnInkData?.Invoke(data.points);
|
||
}
|
||
|
||
void OnDestroy() {
|
||
#if UNITY_IOS
|
||
if (sdkHandle != IntPtr.Zero) {
|
||
WritechSDK_Destroy(sdkHandle);
|
||
sdkHandle = IntPtr.Zero;
|
||
}
|
||
#endif
|
||
}
|
||
}
|
||
```
|
||
|
||
### H.3 Windows桌面集成（C#/.NET）
|
||
|
||
```csharp
|
||
// WritechSDKWrapper.cs - .NET P/Invoke封装
|
||
using System;
|
||
using System.Runtime.InteropServices;
|
||
using System.Threading.Tasks;
|
||
|
||
namespace Writech.SDK {
|
||
|
||
[StructLayout(LayoutKind.Sequential)]
|
||
public struct InkPoint {
|
||
public float X;
|
||
public float Y;
|
||
public float Pressure;
|
||
public long Timestamp;
|
||
[MarshalAs(UnmanagedType.Bool)]
|
||
public bool IsPenUp;
|
||
}
|
||
|
||
public delegate void InkCallback(
|
||
[MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 1)]
|
||
InkPoint[] points, int count);
|
||
|
||
public class WritechSDKWrapper : IDisposable {
|
||
private IntPtr _handle = IntPtr.Zero;
|
||
private InkCallback _inkCallback;
|
||
|
||
[DllImport("WritechSDK.dll", CallingConvention = CallingConvention.Cdecl)]
|
||
private static extern IntPtr writech_sdk_create(
|
||
[MarshalAs(UnmanagedType.LPStr)] string appKey,
|
||
[MarshalAs(UnmanagedType.LPStr)] string appSecret);
|
||
|
||
[DllImport("WritechSDK.dll", CallingConvention = CallingConvention.Cdecl)]
|
||
private static extern int writech_pen_start_scan(IntPtr handle);
|
||
|
||
[DllImport("WritechSDK.dll", CallingConvention = CallingConvention.Cdecl)]
|
||
private static extern int writech_pen_connect(IntPtr handle,
|
||
[MarshalAs(UnmanagedType.LPStr)] string deviceId);
|
||
|
||
[DllImport("WritechSDK.dll", CallingConvention = CallingConvention.Cdecl)]
|
||
private static extern void writech_set_ink_callback(
|
||
IntPtr handle, InkCallback callback);
|
||
|
||
[DllImport("WritechSDK.dll", CallingConvention = CallingConvention.Cdecl)]
|
||
private static extern void writech_sdk_destroy(IntPtr handle);
|
||
|
||
public event EventHandler<InkPoint[]> InkDataReceived;
|
||
|
||
public WritechSDKWrapper(string appKey, string appSecret) {
|
||
_handle = writech_sdk_create(appKey, appSecret);
|
||
if (_handle == IntPtr.Zero)
|
||
throw new InvalidOperationException("SDK初始化失败");
|
||
|
||
// 保持委托引用，防止GC回收
|
||
_inkCallback = (points, count) => {
|
||
InkDataReceived?.Invoke(this, points);
|
||
};
|
||
writech_set_ink_callback(_handle, _inkCallback);
|
||
}
|
||
|
||
public Task StartPenScan() {
|
||
return Task.Run(() => writech_pen_start_scan(_handle));
|
||
}
|
||
|
||
public Task ConnectPen(string deviceId) {
|
||
return Task.Run(() => writech_pen_connect(_handle, deviceId));
|
||
}
|
||
|
||
public void Dispose() {
|
||
if (_handle != IntPtr.Zero) {
|
||
writech_sdk_destroy(_handle);
|
||
_handle = IntPtr.Zero;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
```
|
||
|
||
### H.4 Web/TypeScript完整集成示例
|
||
|
||
```typescript
|
||
// writech-sdk-demo.ts - 完整Web集成示例
|
||
import { WritechSDK, PenDevice, InkStroke, OCRResult } from '@writech/sdk-web';
|
||
|
||
class WritechDemoApp {
|
||
private sdk: WritechSDK;
|
||
private canvas: HTMLCanvasElement;
|
||
private ctx: CanvasRenderingContext2D;
|
||
private currentStroke: { x: number; y: number }[] = [];
|
||
|
||
constructor() {
|
||
this.canvas = document.getElementById('ink-canvas') as HTMLCanvasElement;
|
||
this.ctx = this.canvas.getContext('2d')!;
|
||
this.setupCanvas();
|
||
}
|
||
|
||
async init() {
|
||
this.sdk = await WritechSDK.create({
|
||
appKey: process.env.WRITECH_APP_KEY!,
|
||
appSecret: process.env.WRITECH_APP_SECRET!,
|
||
wasmPath: '/sdk/writech.wasm'
|
||
});
|
||
|
||
this.sdk.onPenFound(this.handlePenFound.bind(this));
|
||
this.sdk.onInkData(this.handleInkData.bind(this));
|
||
this.sdk.onConnectionChanged(this.handleConnectionChange.bind(this));
|
||
|
||
console.log('WritechSDK initialized');
|
||
}
|
||
|
||
async scanAndConnect() {
|
||
try {
|
||
const device = await this.sdk.requestPen(); // 触发浏览器BLE选择器
|
||
await this.sdk.connectPen(device.id);
|
||
document.getElementById('status')!.textContent = `已连接: ${device.name}`;
|
||
} catch (err) {
|
||
console.error('连接失败:', err);
|
||
}
|
||
}
|
||
|
||
private handlePenFound(device: PenDevice) {
|
||
console.log('发现笔设备:', device.name, device.rssi);
|
||
}
|
||
|
||
private handleInkData(stroke: InkStroke) {
|
||
if (stroke.points.length === 0) return;
|
||
|
||
this.ctx.beginPath();
|
||
this.ctx.moveTo(
|
||
stroke.points[0].x * this.canvas.width,
|
||
stroke.points[0].y * this.canvas.height
|
||
);
|
||
|
||
for (let i = 1; i < stroke.points.length; i++) {
|
||
const p = stroke.points[i];
|
||
this.ctx.lineWidth = 1 + p.pressure * 3;
|
||
this.ctx.lineTo(
|
||
p.x * this.canvas.width,
|
||
p.y * this.canvas.height
|
||
);
|
||
}
|
||
|
||
this.ctx.strokeStyle = '#1a1a1a';
|
||
this.ctx.lineCap = 'round';
|
||
this.ctx.lineJoin = 'round';
|
||
this.ctx.stroke();
|
||
}
|
||
|
||
async recognizeCurrentContent() {
|
||
const imageData = this.canvas.toDataURL('image/png');
|
||
const result: OCRResult = await this.sdk.recognizeImage(imageData);
|
||
document.getElementById('result')!.textContent = result.text;
|
||
}
|
||
|
||
private handleConnectionChange(connected: boolean) {
|
||
const statusEl = document.getElementById('pen-status')!;
|
||
statusEl.textContent = connected ? '笔已连接' : '笔已断开';
|
||
statusEl.className = connected ? 'connected' : 'disconnected';
|
||
}
|
||
|
||
private setupCanvas() {
|
||
this.canvas.width = this.canvas.offsetWidth * window.devicePixelRatio;
|
||
this.canvas.height = this.canvas.offsetHeight * window.devicePixelRatio;
|
||
this.ctx.scale(window.devicePixelRatio, window.devicePixelRatio);
|
||
}
|
||
}
|
||
|
||
// 启动应用
|
||
const app = new WritechDemoApp();
|
||
app.init().then(() => {
|
||
document.getElementById('scan-btn')!.addEventListener('click',
|
||
() => app.scanAndConnect());
|
||
document.getElementById('ocr-btn')!.addEventListener('click',
|
||
() => app.recognizeCurrentContent());
|
||
});
|
||
```
|
||
|
||
### H.5 错误处理最佳实践
|
||
|
||
#### H.5.1 完整错误处理示例
|
||
|
||
```kotlin
|
||
// Kotlin完整错误处理
|
||
class WritechSDKErrorHandler {
|
||
|
||
fun handleSDKError(error: WritechException): ErrorAction {
|
||
return when (error.code) {
|
||
// 网络类错误 - 可重试
|
||
ErrorCode.NETWORK_TIMEOUT,
|
||
ErrorCode.NETWORK_UNREACHABLE -> {
|
||
scheduleRetry(delay = 5000)
|
||
ErrorAction.RETRY
|
||
}
|
||
|
||
// 认证类错误 - 需重新认证
|
||
ErrorCode.AUTH_TOKEN_EXPIRED -> {
|
||
refreshToken()
|
||
ErrorAction.RETRY
|
||
}
|
||
ErrorCode.AUTH_INVALID_KEY -> {
|
||
notifyUser("AppKey无效，请检查配置")
|
||
ErrorAction.FATAL
|
||
}
|
||
|
||
// 设备类错误
|
||
ErrorCode.PEN_NOT_FOUND -> {
|
||
showScanDialog()
|
||
ErrorAction.USER_ACTION
|
||
}
|
||
ErrorCode.PEN_DISCONNECTED -> {
|
||
autoReconnect()
|
||
ErrorAction.RETRY
|
||
}
|
||
ErrorCode.PEN_BATTERY_LOW -> {
|
||
showBatteryWarning(error.data as? Int ?: 0)
|
||
ErrorAction.WARN
|
||
}
|
||
|
||
// OCR类错误
|
||
ErrorCode.OCR_IMAGE_TOO_SMALL -> {
|
||
notifyUser("书写内容太少，请继续书写")
|
||
ErrorAction.USER_ACTION
|
||
}
|
||
ErrorCode.OCR_QUOTA_EXCEEDED -> {
|
||
notifyUser("识别次数已达上限，请升级套餐")
|
||
ErrorAction.FATAL
|
||
}
|
||
|
||
else -> {
|
||
logError(error)
|
||
ErrorAction.IGNORE
|
||
}
|
||
}
|
||
}
|
||
|
||
private fun scheduleRetry(delay: Long) {
|
||
Handler(Looper.getMainLooper()).postDelayed({
|
||
// 执行重试逻辑
|
||
}, delay)
|
||
}
|
||
}
|
||
```
|
||
|
||
---
|
||
|
||
*本文档版权归深圳自然写科技有限公司所有，技术细节仅用于软件著作权登记鉴别。*
|