// 获取指定图片格式CLSID int GetEncoderClsid(const WCHAR* format, CLSID* pClsid) {  UINT num= 0;  UINT size= 0;  ImageCodecInfo* pImageCodecInfo= NULL;  GetImageEncodersSize(&num, &size);  if(size== 0)  {   return -1;  }  pImageCodecInfo= (ImageCodecInfo*)(malloc(size));  if(pImageCodecInfo== NULL)  {   return -1;  }  GetImageEncoders(num, size, pImageCodecInfo);  for(UINT j=0; j< num; ++j)  {   if(wcscmp(pImageCodecInfo[j].MimeType, format)== 0)   {    *pClsid= pImageCodecInfo[j].Clsid;    free(pImageCodecInfo);    pImageCodecInfo= NULL;    return j;   }  }  free(pImageCodecInfo);  pImageCodecInfo= NULL;  return -1; }   // 在内存中绘制 Bitmap* pBitmap = new Bitmap(200, 400);  if (!pBitmap)  {   return;  }  Graphics* imageGraphics = Graphics::FromImage(pBitmap);   // do some draw on imageGraphics imageGraphics->FillRectangle(.....); .... and so on..   // save as image CLSID pngClsid;  if (!pBitmap)  {        return FALSE;  }   // save as bmp image GetEncoderClsid(L"image/bmp", &pngClsid);  m_pBitmap->Save("C:\\test.bmp", &pngClsid, NULL);   // save as png image GetEncoderClsid(L"image/png", &pngClsid);  m_pBitmap->Save("C:\\test.png", &pngClsid, NULL);   // save as jpeg image GetEncoderClsid(L"image/jpeg", &pngClsid); m_pBitmap->Save("C:\\test.jpeg", &pngClsid, NULL);    

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