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m_hDeskTopWnd = GetDesktopWindow();
m_hFullDC = GetDC(m_hDeskTopWnd);
hTmpMemDC = CreateCompatibleDC(m_hFullDC);
m_hTmpBitmap = CreateCompatibleBitmap(m_hFullDC,m_nFullWidth,m_nFullHeight);
::SelectObject(hTmpMemDC,m_hTmpBitmap);
::BitBlt(hTmpMemDC, 0, 0, m_nFullWidth, m_nFullHeight, m_hFullDC, 0, 0, m_dwBitBltRop);