WId ImageGrabber::getActiveWindow()
{
    int screenNum;
    xcb_connection_t* connection = xcb_connect (NULL, &screenNum);;
    xcb_get_input_focus_reply_t *replyFocus = xcb_get_input_focus_reply(connection, xcb_get_input_focus(connection), nullptr);
    xcb_query_tree_cookie_t cookie;
    xcb_query_tree_reply_t *replyTree;

    cookie = xcb_query_tree(connection, replyFocus->focus);
    xcb_window_t w = replyFocus->focus;
    while((replyTree = xcb_query_tree_reply(connection, cookie, NULL)) && (replyTree->parent != replyTree->root)) {
        printf("root = %d\n", replyTree->root);
        printf("parent = %d\n", replyTree->parent);
        printf("Focus = %d\n", replyFocus->focus);
        cookie = xcb_query_tree(connection, replyTree->parent);
        w = replyTree->parent;
    }
    printf("**Returned = %d\n", w);
    return w;
}