按指定大小显示图片

  CBitmap bmp;
   CClientDC dc(this);
   if(bmp.LoadBitmap(IDB_BITMAP_dw))
   {

     BITMAP bmpInfo;
     bmp.GetBitmap(&bmpInfo); 

     CDC dcMemory;
     dcMemory.CreateCompatibleDC(&dc);

     CBitmap* pOldBitmap =dcMemory.SelectObject(&bmp);