小步慢跑

   1: /* format 取值為：

   2: image/bmp 

   3: image/jpeg 

   4: image/gif 

   5: image/tiff 

   6: image/png 

   7: */

   8: int GetEncoderClsid( const WCHAR* format, CLSID* pClsid )

   9: {

  10:     UINT  num = 0;          // number of image encoders

  11:     UINT  size = 0;         // size of the image encoder array in bytes

  12:  

  13:     ImageCodecInfo* pImageCodecInfo = NULL;

  14:  

  15:     GetImageEncodersSize(&num, &size);

  16:     if(size == 0)

  17:         return -1;  // Failure

  18:  

  19:     pImageCodecInfo = (ImageCodecInfo*)(malloc(size));

  20:     if(pImageCodecInfo == NULL)

  21:         return -1;  // Failure

  22:  

  23:     GetImageEncoders(num, size, pImageCodecInfo);

  24:  

  25:     for(UINT j = 0; j < num; ++j)

  26:     {

  27:         if( wcscmp(pImageCodecInfo[j].MimeType, format) == 0 )

  28:         {

  29:             *pClsid = pImageCodecInfo[j].Clsid;

  30:             free(pImageCodecInfo);

  31:             return j;  // Success

  32:         }    

  33:     }

  34:  

  35:     free(pImageCodecInfo);

  36:     return -1;  // Failure

  37:  

  38: }

   1: CLSID bmpClsid;

   2: GetEncoderClsid(L"image/bmp", &bmpClsid);

   3:  

   4: //保存到磁盤上的bmp文件

   5: Gdiplus::Bitmap bitmap(hBitmap,NULL);

   6: bitmap.Save(L"1.bmp", &bmpClsid, NULL);

   7:  

   8: // 轉(zhuǎn)換為png，再保存到磁盤上

   9: CLSID pngid;

  10: GetEncoderClsid(L"image/png", &pngid);

  11: bitmap.Save(L"1.png",&pngid,NULL);

   1: Gdiplus::Image * pImage = Gdiplus::Image::FromFile(L"E:/Dropbox/MyDocument/美圖圖庫/示例圖片_03.jpg");

   2: pImage->Save(L"2.bmp",&bmpClsid,NULL);