coхранить график как файл jpg

#include "stdafx.h"
#include "SaveJpg.h"
#include <windows.h>
#include <objbase.h>
#include <gdiplus.h>
 
#pragma comment(lib, "gdiplus.lib")
 
using namespace Gdiplus;
 
int GetEncoderClsid(const WCHAR* format, CLSID* pClsid);
 
int APIENTRY _tWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
    LPTSTR lpCmdLine, int nCmdShow)
{
    ULONG_PTR gdiplusToken;
    GdiplusStartupInput gdiplusStartupInput;
    GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, 0);
 
    Bitmap* bitmap = new Bitmap(1024, 768);
    Graphics* graph = new Graphics(bitmap);
    Pen* greenPen = new Pen(Color(0, 0xff, 0));
    graph->DrawEllipse(greenPen, 100, 100, 1000, 500);
    CLSID* jpgClsid = new CLSID;
    GetEncoderClsid(L"image/jpeg", jpgClsid);
    bitmap->Save(L"ellipse.jpg", jpgClsid);
 
    delete jpgClsid;
    delete greenPen;
    delete graph;
    delete bitmap;
 
    GdiplusShutdown(gdiplusToken);
}
 
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
}