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CDC *pDC = GetDC();
CDC memDC;
memDC.CreateCompatibleDC(pDC);
CRect rect;
GetClientRect(&rect);
CBitmap bmp,*pOldbmp;
bmp.CreateCompatibleBitmap(pDC,rect.Width(),rect.Height());
pOldbmp = memDC.SelectObject(&bmp);
CBrush br(RGB(255, 255, 255));
memDC.FillRect(&rect, &br);
pDC->BitBlt(0, 0, rect.Width(), rect.Height(), &memDC, 0, 0, SRCCOPY);
memDC.SelectObject(pOldbmp);
bmp.DeleteObject();
ReleaseDC(&memDC);
ReleaseDC(pDC);