HWND hwnd = GetForegroundWindow();
    HWND lowestHwnd = GetWindow(hwnd, GW_HWNDLAST);
    printf("error:%d\n", GetLastError());
    int z = 0;
    HWND hwndTmp = lowestHwnd;
    while (hwndTmp)
    {
        hwnd = hwndTmp;
        hwndTmp = GetWindow(hwndTmp, GW_HWNDPREV);
        if (hwnd == hwndTmp)
            return hwnd;
        z++;
    }