Xlib：如何检查窗口是否最小化？

编辑：这段代码应该有效吗？

int window_is_minimized(Display *display,Window window) {
    Atom actual_type;
    int actual_format;
    unsigned long i,num_items,bytes_after;
    Atom *atoms;

    atoms=NULL;

    XGetWindowProperty(display,window,vdl_x11_usefull_atoms->_NET_WM_STATE,1024,False,XA_ATOM,&actual_type,&actual_format,&num_items,&bytes_after,(unsigned char**)&atoms);

    for(i=0; i<num_items; ++i) {
        if(atoms[i]==vdl_x11_usefull_atoms->_NET_WM_STATE_HIDDEN) {
            XFree(atoms);
            return 1;
        }
    }
    XFree(atoms);
    return 0;
}