struct xcb_get_geometry_cookie_t{
        uint sequence;
}

struct xcb_get_geometry_reply_t{
        char response_type;
        char depth;
        ushort sequence;
        uint length;
        uint root;
        int x;
        int y;
        ushort width;
        ushort height;
        ushort border_width;
}

xcb_generic_error_t* e;
                xcb_get_geometry_reply_t* attr = xcb_get_geometry_reply(gui.conn, xcb_get_geometry(gui.conn, id), &e);