窗口截图(可指定HWND窗口句柄)

来源：互联网发布：腾讯tim知乎编辑：程序博客网时间：2024/05/16 18:41
    BOOL SaveHwndToBmpFile(HWND hWnd, LPCTSTR lpszPath)      {          HWND hDesktop = ::GetDesktopWindow();          ASSERT(hDesktop);          if(NULL == hWnd)          {              hWnd = hDesktop;          }          RECT rect;          ::GetWindowRect(hWnd, &rect);                int nWidht = rect.right - rect.left;          int nHeight = rect.bottom - rect.top;                HDC hSrcDC = ::GetWindowDC(hWnd);          ASSERT(hSrcDC);          HDC hMemDC = ::CreateCompatibleDC(hSrcDC);          ASSERT(hMemDC);          HBITMAP hBitmap = ::CreateCompatibleBitmap(hSrcDC, nWidht, nHeight);          ASSERT(hBitmap);          HBITMAP hOldBitmap = (HBITMAP)::SelectObject(hMemDC, hBitmap);          ::BitBlt(hMemDC, 0, 0, nWidht, nHeight, hSrcDC, 0, 0, SRCCOPY);                BITMAP bitmap = {0};          ::GetObject(hBitmap, sizeof(BITMAP), &bitmap);          BITMAPINFOHEADER bi = {0};          BITMAPFILEHEADER bf = {0};                    CONST int nBitCount = 24;          bi.biSize = sizeof(BITMAPINFOHEADER);          bi.biWidth = bitmap.bmWidth;          bi.biHeight = bitmap.bmHeight;          bi.biPlanes = 1;          bi.biBitCount = nBitCount;          bi.biCompression = BI_RGB;          DWORD dwSize = ((bitmap.bmWidth * nBitCount + 31) / 32) * 4 * bitmap.bmHeight;                HANDLE hDib = GlobalAlloc(GHND, dwSize + sizeof(BITMAPINFOHEADER));          LPBITMAPINFOHEADER lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDib);          *lpbi = bi;                ::GetDIBits(hMemDC, hBitmap, 0, bitmap.bmHeight, (BYTE*)lpbi + sizeof(BITMAPINFOHEADER), (BITMAPINFO*)lpbi, DIB_RGB_COLORS);                try          {              CFile file;              file.Open(lpszPath, CFile::modeCreate | CFile::modeWrite);              bf.bfType = 0x4d42;              dwSize += sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);              bf.bfSize = dwSize;              bf.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);                    file.Write((BYTE*)&bf, sizeof(BITMAPFILEHEADER));              file.Write((BYTE*)lpbi, dwSize);              file.Close();          }          catch(CFileException* e)          {              e->ReportError();              e->Delete();          }                    GlobalUnlock(hDib);          GlobalFree(hDib);                    ::SelectObject(hMemDC, hOldBitmap);          ::DeleteObject(hBitmap);          ::DeleteDC(hMemDC);          ::ReleaseDC(hWnd, hSrcDC);                return TRUE;      }            // 调用方法      HWND hWnd = ::FindWindow(NULL, _T("XXX"));         if(hWnd)         {            SaveHwndToBmpFile(hWnd, _T("F://12.bmp"));         }
源自：http://blog.csdn.net/visualeleven/article/details/6202796