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CClientDC dc(this);
CDC *pMemDC = GetDesktopWindow()->GetWindowDC();
CBitmap bmp;
bmp.CreateCompatibleBitmap(pMemDC,1440,900);
if(!m_dcMem.m_hDC)
m_dcMem.CreateCompatibleDC(pMemDC);
m_dcMem.SelectObject(&bmp);
m_dcMem.BitBlt(0,0,1440,900,pMemDC,0,0,SRCCOPY);
//output unregister information
CFont font;
font.CreatePointFont(120,_T("黑体"));
CFont *pOldFont = m_dcMem.SelectObject(&font);
m_dcMem.TextOut(50,50,_T("超级屏幕录象机 未注册"),_tcslen(_T("超级屏幕录象机 未注册")));
m_dcMem.SelectObject(pOldFont);
dc.BitBlt(0,0,1440,900,&m_dcMem,0,0,SRCCOPY);