用MFC展示两张位图

用MFC显示两张位图
一张作为背景，另一张放在背景上，如坐标系上放一个空心的园，求高手解答 mfc
[解决办法]
内存DC
CreateCompatibleDC
[解决办法]
类似于这样的


case(WM_PAINT):
{
  PAINTSTRUCT ps;
  CDC *pDC = BeginPaint(&ps);

  //客户区大小
  CRect rcClient;
  GetClientRect(rcClient);
  int nWidth = rcClient.Width();
  int nHeight = rcClient.Height();

  CDC memDC;   memDC.CreateCompatibleDC(pDC); //兼容DC
  CBitmap bitMap;  bitMap.LoadBitmap(IDB_BKIMAGE); //背景图片
  CBitmap *pOldbmp = memDC.SelectObject(&bitMap); //位图选人内存DC
  
  BITMAP bmpInfo;  bitMap.GetBitmap(&bmpInfo); //获取背景图片信息

  pDC-&gt;SetStretchBltMode(HALFTONE);//半色调
  pDC-&gt;StretchBlt(0, 0, nWidth, nHeight, //目标尺寸
    &memDC, //源DC
    0, 0, bmpInfo.bmWidth, bmpInfo.bmHeight, //源尺寸
    SRCCOPY); //贴背景图/缩放到客户区

  //绘前景图片
  bitMap.DeleteObject();
  bitMap.LoadBitmap(IDB_BITMAP1);
  bitMap.GetBitmap(&bmpInfo);
  pDC-&gt;BitBlt(100, 100, bmpInfo.bmWidth, bmpInfo.bmHeight,
    &memDC, 
    0, 0,
    SRCCOPY);

  //结束清理工作
  memDC.SelectObject(pOldbmp); //恢复位图句柄
  memDC.DeleteDC(); //删除内存DC
  bitMap.DeleteObject(); //内存位图

  EndPaint(&ps);

  return 0;
}

[解决办法]
MFC 用GDI+画
初始化
Gdiplus::Graphics phics(m_gdiBitmap);
Gdiplus::Image image(CStringW("D:\\2010_Projects\\imitate\\imitate\\res\\base.jpg"));
phics.DrawImage(&image,0,0,1000,10000);
onpaint（）
Gdiplus::Graphics myPhics（dc.m_hdc）；
myPhics.DrawImage(m_gdiBitmap,Gdiplus::RectF(0,0,Gdiplus::REAL(rect.Width()),Gdiplus::REAL(rect.Height())),
m_validRect.X,m_validRect.Y,m_validRect.Width,m_validRect.Height,Gdiplus::UnitPixel);
GDI+不支持双缓冲，可以自己用两张画布，替换着画

用MFC展示两张位图

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