MFC双缓存无闪烁切换背景图

代码如下：

BOOL COnPintView::OnEraseBkgnd(CDC* pDC)
{
    // TODO: 在此添加消息处理程序代码和/或调用默认值
    CBitmap bitmap;
    CRect rect;
    //GetClientRect(&rect);
    GetWindowRect(&rect);


    CDC dcMemory;
    dcMemory.CreateCompatibleDC(NULL);
    bitmap.CreateCompatibleBitmap(pDC,rect.Width(),rect.Height());

    CBitmap* pOldBitmap = dcMemory.SelectObject(&bitmap);
    dcMemory.FillSolidRect(rect,RGB(255,255,255));
    

    //画背景图在内存上
    CBitmap            btm;
    if(m_nIndex ==0)
    {
        btm.LoadBitmap(IDB_BITMAP1);
    }
    else
    {
        btm.LoadBitmap(IDB_BITMAP2);
    }
    GetClientRect(rect);
    BITMAP bm;

    CDC dcMem;
    VERIFY(btm.GetObject(sizeof(bm),(LPVOID)&bm));
    dcMem.CreateCompatibleDC(pDC);
    CBitmap *pOldBMP =( CBitmap *)dcMem.SelectObject(&btm);
    dcMemory.BitBlt( (rect.right - bm.bmWidth)/2,(rect.bottom - bm.bmHeight)/2,bm.bmWidth,bm.bmHeight,&dcMem,0,0,SRCCOPY);
    dcMem.SelectObject(pOldBMP);
    dcMem.DeleteDC();




    //显示在界面上
    pDC->BitBlt(0, 0, rect.right, rect.bottom, &dcMemory,0, 0, SRCCOPY);

    dcMemory.SelectObject(pOldBitmap); 
    dcMemory.DeleteDC();
    bitmap.DeleteObject();
    btm.DeleteObject();
    //return CView::OnEraseBkgnd(pDC);
return TRUE;
}

 

源码地址：http://download.csdn.net/source/3551031