Qt, скриншот активного окна

QScreen::grabWindow(WId window,...

#ifdef Q_WS_X11
void Core::getActiveWind_X11()
{
    netwm::init();
    Window *wnd = reinterpret_cast<ulong *>(netwm::property(QX11Info::appRootWindow(), NET_ACTIVE_WINDOW, XA_WINDOW));

    if(!wnd)
    {
        *pixelMap = QPixmap::grabWindow(QApplication::desktop()->winId());
        exit(1);
    }

    // no dectortions option is select
    if (conf->getNoDecorX11() == true)
    {
        *pixelMap = QPixmap::grabWindow(*wnd);
        return;
    }

    unsigned int d;
    int status;
    int stat;

//    if (status != 0) {
      Window rt, *children, parent;

    // Find window manager frame
    while (true)
    {
        status = XQueryTree(QX11Info::display(), *wnd, &rt, &parent, &children, &d);
        if (status && (children != None))
        {
            XFree((char *) children);
        }

        if (!status || (parent == None) || (parent == rt))
        {
            break;
        }

        *wnd = parent;
    }

    XWindowAttributes attr; // window attributes
    stat = XGetWindowAttributes(QX11Info::display(), *wnd, &attr);

    if ((stat == False) || (attr.map_state != IsViewable))
    {
	CmdLine::print("Not window attributes.");
    }

    // get wnd size
    int rx = 0, ry = 0, rw = 0, rh = 0;
    rw = attr.width;
    rh = attr.height;
    rx = attr.x;
    ry = attr.y;

    *pixelMap = QPixmap::grabWindow(QApplication::desktop()->winId(), rx, ry, rw, rh);

    XFree(wnd);
}
#endif

#ifdef Q_WS_WIN
void Core::getActiveWind_Win32()
{
    HWND findWindow = GetForegroundWindow();

    if (findWindow == NULL)
    {
        return;
    }

    if (findWindow == GetDesktopWindow())
    {
        return;
    }

    ShowWindow(findWindow, SW_SHOW);
    SetForegroundWindow(findWindow);

    HDC hdcScreen = GetDC(NULL);

    RECT rcWindow;
    GetWindowRect(findWindow, &rcWindow);

    if (IsZoomed(findWindow))
    {
        if (QSysInfo::WindowsVersion >= QSysInfo::WV_VISTA)
        {
          rcWindow.right -= 8;
          rcWindow.left += 8;
          rcWindow.top += 8;
          rcWindow.bottom -= 8;
        }
        else
        {
          rcWindow.right += 4;
          rcWindow.left -= 4;
          rcWindow.top += 4;
          rcWindow.bottom -= 4;
        }
    }

    HDC hdcMem = CreateCompatibleDC(hdcScreen);
    HBITMAP hbmCapture = CreateCompatibleBitmap(hdcScreen, rcWindow.right - rcWindow.left, rcWindow.bottom - rcWindow.top);
    SelectObject(hdcMem, hbmCapture);

    BitBlt(hdcMem, 0, 0, rcWindow.right - rcWindow.left, rcWindow.bottom - rcWindow.top, hdcScreen, rcWindow.left, rcWindow.top, SRCCOPY);

    ReleaseDC(findWindow, hdcMem);
    DeleteDC(hdcMem);

    *pixelMap = QPixmap::fromWinHBITMAP(hbmCapture);

    DeleteObject(hbmCapture);
}
#endif