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窗口截图

2024-07-14 00:04:00   225人阅读

窗口截图，可以获取遮挡窗口完整的图像，并保存到bmp文件中去。主要用到的函数中PrintWindow，VC6不支持该函数，请使用VS2008来编译。其它需求如平台要求请参考MSDN文档。

 1 void SaveHwndToBmpFile(HWND hWnd, LPCTSTR lpszPath) 2 { 3     HDC hDC = ::GetWindowDC(hWnd); 4     ASSERT(hDC); 5      6     HDC hMemDC = ::CreateCompatibleDC(hDC); 7     ASSERT(hMemDC); 8      9     RECT rc;10     ::GetWindowRect(hWnd, &rc);11 12     HBITMAP hBitmap = ::CreateCompatibleBitmap(hDC, rc.right - rc.left, rc.bottom - rc.top);13     ASSERT(hBitmap);14     15     HBITMAP hOldBmp = (HBITMAP)::SelectObject(hMemDC, hBitmap);16     ::PrintWindow(hWnd, hMemDC, 0);17 18     BITMAP bitmap = {0};19     ::GetObject(hBitmap, sizeof(BITMAP), &bitmap);20     BITMAPINFOHEADER bi = {0};21     BITMAPFILEHEADER bf = {0};22 23     CONST int nBitCount = 24;24     bi.biSize = sizeof(BITMAPINFOHEADER);25     bi.biWidth = bitmap.bmWidth;26     bi.biHeight = bitmap.bmHeight;27     bi.biPlanes = 1;28     bi.biBitCount = nBitCount;29     bi.biCompression = BI_RGB;30     DWORD dwSize = ((bitmap.bmWidth * nBitCount + 31) / 32) * 4 * bitmap.bmHeight;31 32     HANDLE hDib = GlobalAlloc(GHND, dwSize + sizeof(BITMAPINFOHEADER));33     LPBITMAPINFOHEADER lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDib);34     *lpbi = bi;35 36     ::GetDIBits(hMemDC, hBitmap, 0, bitmap.bmHeight, (BYTE*)lpbi + sizeof(BITMAPINFOHEADER), (BITMAPINFO*)lpbi, DIB_RGB_COLORS);37 38     try39     {40         CFile file;41         file.Open(lpszPath, CFile::modeCreate | CFile::modeWrite);42         bf.bfType = 0x4d42;43         dwSize += sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);44         bf.bfSize = dwSize;45         bf.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);46 47         file.Write((BYTE*)&bf, sizeof(BITMAPFILEHEADER));48         file.Write((BYTE*)lpbi, dwSize);49         file.Close();50     }51     catch(CFileException* e)52     {53         e->ReportError();54         e->Delete();55     }56 57     GlobalUnlock(hDib);58     GlobalFree(hDib);59 60     ::SelectObject(hMemDC, hOldBmp);61     ::DeleteObject(hBitmap);    62     ::DeleteObject(hMemDC);63     ::ReleaseDC(hWnd, hDC);64 }65 66 // 调用方法67 HWND hWnd = ::FindWindow(NULL, _T("XXX"));68 if(hWnd)69 {70    SaveHwndToBmpFile(hWnd, _T("F://12.bmp"));71 }

文章来源:http://blog.csdn.net/visualeleven/article/details/6206715


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