MFC对话框背景图片改变代码

//放在OnPaint()里

{//设置背景图片
    //CDialog::OnPaint();
    CRect    rect;   
    GetClientRect(&rect);   
    CDC    *pDC=GetDC();   
    CDC    memdc;   
    memdc.CreateCompatibleDC(pDC);   
    CBitmap    bitmap;   
    //从资源中载入位图   
    bitmap.LoadBitmap(IDB_BITMAP1);   
    memdc.SelectObject(bitmap);   
    pDC->BitBlt(0,0,rect.Width(),rect.Height(),&memdc,0,0,SRCCOPY);
}