[C++] Win32 GDI+ Update Bitmap value?

[meesa]

I'm creating a program, and I need to load a PNG image from the resource files. The goal is simple, pass a Bitmap object by reference to a function, which assigns the PNG from the stream to it, and returns. Because it's by reference, the origial should be affected.

Using the tutorial over on CodeProject, I came up with the following code:

int loadResource(Bitmap& image,LPCTSTR name,LPCTSTR type,HINSTANCE hinst=GetModuleHandle(0)){

  HRSRC hRes=FindResource(hinst, name, type);
  if(!hRes) return -1;

  unsigned long imgSize=SizeofResource(hinst, hRes);
  if(!imgSize) return -1;

  const void* pResData=LockResource(LoadResource(hinst, hRes));
  if(!pResData) return -1;

  HGLOBAL buffer=GlobalAlloc(GMEM_MOVEABLE, imgSize);
  if(buffer){
    void* pBuffer=GlobalLock(buffer);

    if(pBuffer){
      CopyMemory(pBuffer, pResData, imgSize);

      IStream* pStream=NULL;
      if(CreateStreamOnHGlobal(buffer, false, &pStream)==S_OK){
        image.FromStream(pStream);
        int status=image.GetLastStatus();
        if(status==Ok){
          pStream->Release();
          GlobalUnlock(buffer);
          GlobalFree(buffer);
          return status;
        }
        else{
          pStream->Release();
          GlobalUnlock(buffer);
          GlobalFree(buffer);
          return status;
        }
      }
    }
  }
  return -1;
}

And in my WM_PAINT:

/*Standard stuff*/
HINSTANCE hinst=GetModuleHandle(0);
			
//This one works, but in the release, I don't want the image outside of the EXE
//Bitmap image(L"temp.png"); 
Bitmap image(30,44);
loadResource(image, MAKEINTRESOURCE(IDB_TEMP), RT_RCDATA);
Graphics graphics(hdc);
TextureBrush brush(&image,WrapModeTile);
graphics.FillRectangle(&brush, Rect(0, 0, 60, 88));

/*Standard stuff*/

The problem is that the original Bitmap isn't updated properly. It's initialized, and keeps that value, even after loadResource() runs.

Can anybody help me out with this?