一个典型的双缓冲的例子

CPaintDC dc(this);
CRect rtClient;
GetClientRect(rtClient);


CDC memDC;
memDC.CreateCompatibleDC(&dc);
HBITMAP hBmp = CreateCompatibleBitmap(dc.GetSafeHdc(),rtClient.Width(),rtClient.Height());
HGDIOBJ hOldBmp = memDC.SelectObject(hBmp);


for (int i = 0 ; i < rtClient.Width() ; ++i)
{
<span style="white-space:pre">	</span>for (int j = 0 ; j < rtClient.Height() ; ++j)
<span style="white-space:pre">	</span>{
<span style="white-space:pre">		</span>memDC.SetPixel(i,j,RGB(0,0,255));// 在这里将memDC换成dc看看效果
<span style="white-space:pre">	</span>}
}
dc.BitBlt(rtClient.left,rtClient.top,rtClient.Width(),rtClient.Height(),&memDC,0,0,SRCCOPY);


memDC.SelectObject(hOldBmp);
DeleteObject(hOldBmp);
memDC.DeleteDC();