gdi+把bmp存为jpg

int GetEncoderClsid(const WCHAR* format, CLSID* pClsid)
{
   UINT  num = 0;          // number of image encoders
   UINT  size = 0;         // size of the image encoder array in bytes

   ImageCodecInfo* pImageCodecInfo = NULL;

   GetImageEncodersSize(&num, &size);
   if(size == 0)
      return -1;  // Failure

   pImageCodecInfo = (ImageCodecInfo*)(malloc(size));
   if(pImageCodecInfo == NULL)
      return -1;  // Failure

   GetImageEncoders(num, size, pImageCodecInfo);

   for(UINT j = 0; j < num; ++j)
   {
      if( wcscmp(pImageCodecInfo[j].MimeType, format) == 0 )
      {
         *pClsid = pImageCodecInfo[j].Clsid;
         free(pImageCodecInfo);
         return j;  // Success
      }   
   }

   free(pImageCodecInfo);
   return -1;  // Failure
}

void BMP2JPG(CString strBMPFile,CString strJPGFile)
{
    CLSID  encoderClsid;
    WCHAR  strGuid[39];
    if(GetEncoderClsid(L"image/jpeg", &encoderClsid) >= 0)
    StringFromGUID2(encoderClsid, strGuid, 39);
 
    Image image(strBMPFile.AllocSysString());
    image.Save(strJPGFile.AllocSysString(),&encoderClsid,NULL);

}

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