C++常用类型转换（在Unicode和MBCS之间相互转换函数）

BOOL MByteToWChar(LPCSTR lpcszStr, LPWSTR lpwszStr, DWORD dwSize)
{
        DWORD dwMinSize;
        dwMinSize = MultiByteToWideChar(CP_ACP, 0, lpcszStr, -1, NULL, 0);
        if (dwSize < dwMinSize)
        {
                return FALSE;
        }
        MultiByteToWideChar(CP_ACP, 0, lpcszStr, -1, lpwszStr, dwMinSize);
        return TRUE;
}
BOOL WCharToMByte(LPCWSTR lpcwszStr, LPSTR lpszStr, DWORD dwSize)
{
        DWORD dwMinSize;
        dwMinSize = WideCharToMultiByte(CP_OEMCP, NULL, lpcwszStr, -1, NULL, 0, NULL, FALSE);
        if (dwSize < dwMinSize)
        {
                return FALSE;
        }
        WideCharToMultiByte(CP_OEMCP, NULL, lpcwszStr, -1, lpszStr, dwSize, NULL, FALSE);
        return TRUE;
}

#ifndef NOT_SAVE_IMAGE
  std::string name;
  std::stringstream ss1;
  ss1.str("");
  ss1 << "imageSrc";
  ss1 << index;
  ss1 << ".jpg";
  name = ss1.str();
  _saveImageMat(name, imageSrc);
  ss1.str("");
  ss1 << "imageDst";
  ss1 << index;
  ss1 << ".jpg";
  name = ss1.str();
  _saveImageMat(name, imageDst);
#endif
void CGPUTest::_saveImageMat(std::string path, const cv::Mat& img)
{
  //根据扩展名来决定储存jpg还是bmp
  if (path.find("jpg") != path.npos)//找到了jpg,一个特别的标志c++中用npos表示
  {
  vector<int> compression_params;
  compression_params.push_back(cv::IMWRITE_JPEG_QUALITY);//选择jpeg
  compression_params.push_back(100);//在这个填入你要的图片质量,默认值是95,100代表满分
  cv::imwrite(path, img, compression_params);//根据路径,保存为jpg格式
  }
  else
  {
  cv::imwrite(path, img);//根据路径,保存为bmpg格式
  }
}