#include 
				<windows.h>#include <gdiplus.h>#include <stdio.h>#pragma comment(lib,"gdiplus.lib")

using namespace Gdiplus;

INT GetEncoderClsid(const WCHAR* format, CLSID* pClsid);   // helper function  

INT main()  
  {
    // Initialize GDI+.  
    GdiplusStartupInput gdiplusStartupInput;
    ULONG_PTR gdiplusToken;
    GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);

    CLSID   encoderClsid;
    Status   stat;
    Image*   image = new Image(L"test.png");

    // Get the CLSID of the PNG encoder.  
    GetEncoderClsid(L"image/bmp", &encoderClsid);  //或者image/png image/jpeg等

    stat = image->Save(L"test2.bmp", &encoderClsid, NULL);

    if(stat == Ok)
      printf("test2.png was saved successfully\n");
    else
      printf("Failure: stat = %d\n", stat);

    delete image;
    GdiplusShutdown(gdiplusToken);
    return 0;  
  }


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
}