vc++2008 屏幕抓取

 // 拷贝屏幕HBITMAP Cs1Dlg::CopyScreenToBitmap(int & nWidth, int & nHeight){HDChScrDC,hMemDC;HBITMAP hBitmap,hOldBitmap;int xScrn,yScrn;hScrDC=CreateDC(_T("display"),NULL,NULL,NULL);hMemDC=CreateCompatibleDC(hScrDC);xScrn=GetDeviceCaps(hScrDC,HORZRES);yScrn=GetDeviceCaps(hScrDC,VERTRES);nWidth=xScrn;nHeight=yScrn;hBitmap=CreateCompatibleBitmap(hScrDC,xScrn,yScrn);hOldBitmap=(HBITMAP)SelectObject(hMemDC,hBitmap);BitBlt(hMemDC,0,0,xScrn,yScrn,hScrDC,0,0,SRCCOPY);hBitmap=(HBITMAP)SelectObject(hMemDC,hOldBitmap);DeleteDC(hScrDC);DeleteDC(hMemDC);return HBITMAP();}void Cs1Dlg::OnBnClickedButton2(){// TODO: 在此添加控件通知处理程序代码HBITMAP bmp;int nWidth,nHeight;CPen *pOldPen=NULL;HBITMAP hOldBmp=NULL;bmp=CopyScreenToBitmap (nWidth,nHeight);CDC *pDC=new CClientDC(this);CDC srcDC;CRect rect;this->GetClientRect (&rect);rect.DeflateRect (0,20);CPen pen;pen.CreatePen (PS_SOLID,2,RGB(0,255,255));pOldPen =pDC->SelectObject(&pen);pDC->Rectangle(rect);srcDC.CreateCompatibleDC (pDC);hOldBmp=(HBITMAP)srcDC.SelectObject(bmp);pDC->StretchBlt(rect.left +2,rect.top +2,rect.right -rect.left -4,rect.bottom -rect.top -4,&srcDC,0,0,nWidth,nHeight,SRCCOPY);pDC->SelectObject (pOldPen);pDC->SelectObject (hOldBmp);pen.DeleteObject ();DeleteObject(bmp);srcDC.DeleteDC ();delete pDC;pDC=NULL;}