// 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);

评论