src/WeChatOcrCpp/ImageOcr.cpp

#include "ImageOcr.h"
#include <Windows.h>
#include <fstream>
#include <thread>
#include <iostream>

ImageOcr::ImageOcr(const std::string& path)
{
    // 创建 OcrManager 实例
    if (path.empty())
        _ocrManager = new OcrManager();
    else
        _ocrManager = new OcrManager(path);
    
    // 启动微信OCR
    _ocrManager->StartWeChatOcr(_ocrManager);
}

ImageOcr::~ImageOcr()
{
    // 停止微信OCR并释放资源
    if (_ocrManager != nullptr)
    {
        _ocrManager->KillWeChatOcr();
        delete _ocrManager;
        _ocrManager = nullptr;
    }
}

void ImageOcr::Run(const std::string& imagePath, std::function<void(const std::string&, std::string&)> callback)
{
    // 设置回调函数
    if (callback)
        _ocrManager->SetOcrResultCallback(callback);
    
    // 尝试执行OCR任务，失败时重试
    unsigned int retryCount = 0;
    while (retryCount <= MaxRetryTimes)
    {
        try
        {
            _ocrManager->DoOcrTask(imagePath);
            return;
        }
        catch (const std::overflow_error&)
        {
            // 如果任务队列溢出，等待一段时间后重试
            std::this_thread::sleep_for(std::chrono::milliseconds(10));
            retryCount++;
        }
        catch (const std::exception& ex)
        {
            // 其他异常，输出错误信息并返回
            std::cerr << "OCR Error: " << ex.what() << std::endl;
            return;
        }
    }
}

// 将字节数组写入临时文件
static void WriteBytesToFile(const std::string& filePath, const unsigned char* bytes, size_t length)
{
    std::ofstream fileStream(filePath, std::ios::binary);
    if (fileStream.is_open())
    {
        fileStream.write(reinterpret_cast<const char*>(bytes), length);
        fileStream.close();
    }
}

void ImageOcr::Run(const unsigned char* bytes, size_t length, std::function<void(const std::string&, std::string&)> callback, ImageType imgType)
{
    // 创建临时文件路径
    char tempPath[MAX_PATH];
    GetTempPathA(MAX_PATH, tempPath);
    
    std::string extension;
    switch (imgType)
    {
        case ImageType::Png: extension = "png"; break;
        case ImageType::Jpeg: extension = "jpeg"; break;
        case ImageType::Bmp: extension = "bmp"; break;
        default: extension = "png";
    }
    
    std::string imgPath = std::string(tempPath) + "generate4wechat." + extension;
    
    // 将字节数组写入临时文件
    WriteBytesToFile(imgPath, bytes, length);
    
    // 对临时文件执行OCR
    Run(imgPath, callback);
}