窗口截图(可指定HWND窗口句柄)（三篇文章）

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"));
}

http://blog.csdn.net/visualeleven/article/details/6202796

http://blog.csdn.net/visualeleven/article/details/6206715

http://blog.csdn.net/visualeleven/article/details/6093484