C++实现屏幕截图功能

void CDemoDlg::ScreenShot(void) 
{ 
 CWnd *pDesktop = GetDesktopWindow(); 
 CDC *pdeskdc = pDesktop->GetDC(); 
 CRect re; 
 //获取窗口的大小 
 pDesktop->GetClientRect(&re); 
 CBitmap bmp; 
 bmp.CreateCompatibleBitmap(pdeskdc, re.Width(), re.Height()); 
 //创建一个兼容的内存画板 
 CDC memorydc; 
 memorydc.CreateCompatibleDC(pdeskdc); 
 //选中画笔 
 CBitmap *pold = memorydc.SelectObject(&bmp); 
 //绘制图像 
 memorydc.BitBlt(0, 0, re.Width(), re.Height(), pdeskdc, 0, 0, SRCCOPY); 
 //获取鼠标位置，然后添加鼠标图像 
 CPoint po; 
 GetCursorPos(&po); 
 HICON hinco = (HICON)GetCursor(); 
 memorydc.DrawIcon(po.x - 10, po.y - 10, hinco); 
 //选中原来的画笔 
 memorydc.SelectObject(pold); 
 BITMAP bit; 
 bmp.GetBitmap(&bit); 
 //定义 图像大小（单位：byte） 
 DWORD size = bit.bmWidthBytes * bit.bmHeight; 
 LPSTR lpdata = (LPSTR)GlobalAlloc(GPTR, size); 
 //后面是创建一个bmp文件的必须文件头 
 BITMAPINFOHEADER pbitinfo; 
 pbitinfo.biBitCount = 24; 
 pbitinfo.biClrImportant = 0; 
 pbitinfo.biCompression = BI_RGB; 
 pbitinfo.biHeight = bit.bmHeight; 
 pbitinfo.biPlanes = 1; 
 pbitinfo.biSize = sizeof(BITMAPINFOHEADER); 
 pbitinfo.biSizeImage = size; 
 pbitinfo.biWidth = bit.bmWidth; 
 pbitinfo.biXPelsPerMeter = 0; 
 pbitinfo.biYPelsPerMeter = 0; 
 GetDIBits(pdeskdc->m_hDC, bmp, 0, pbitinfo.biHeight, lpdata, (BITMAPINFO*) 
  &pbitinfo, DIB_RGB_COLORS); 
 BITMAPFILEHEADER bfh; 
 bfh.bfReserved1 = bfh.bfReserved2 = 0; 
 bfh.bfType = ((WORD)('M' << 8) | 'B'); 
 bfh.bfSize = size + 54; 
 bfh.bfOffBits = 54; 
 //写入文件 
 CFile file; 
 CString strFileName(GetAppPathW().c_str()); 
 strFileName += _T("ScreenShot\\"); 
 CreateDirectory((LPCTSTR)strFileName, NULL); 
 CTime t = CTime::GetCurrentTime(); 
 CString tt = t.Format("%Y-%m-%d_%H-%M-%S"); 
 strFileName += tt; 
 strFileName += _T(".bmp"); 
 if (file.Open((LPCTSTR)strFileName, CFile::modeCreate | CFile::modeWrite)) 
 { 
  file.Write(&bfh, sizeof(BITMAPFILEHEADER)); 
  file.Write(&pbitinfo, sizeof(BITMAPINFOHEADER)); 
  file.Write(lpdata, size); 
  file.Close(); 
 } 
 GlobalFree(lpdata); 
}