通过xid获取窗口title

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1 
gchar *get_window_title (Display *disp, Window win)
{
   gchar *title_utf8;
   gchar *wm_name;
   gchar *net_wm_name;

   wm_name = get_property(disp, win, XA_STRING, "WM_NAME", NULL);

   net_wm_name = get_property(disp, win,
   XInternAtom(disp, "UTF8_STRING", False), "_NET_WM_NAME", NULL);

   if (net_wm_name)
   {
   title_utf8 = g_strdup(net_wm_name);
   }
   else
   {
   if (wm_name)
   {
   title_utf8 = g_locale_to_utf8(wm_name, -1, NULL, NULL, NULL);
   }
   else
   {
   title_utf8 = NULL;
   }
   }

   g_free(wm_name);
   g_free(net_wm_name);

   return title_utf8;
}

gchar *get_property (Display *disp, Window win,
   Atom xa_prop_type, gchar *prop_name,
   unsigned long *size)
{
   Atom xa_prop_name;
   Atom xa_ret_type;
   int ret_format;
   unsigned long ret_nitems;
   unsigned long ret_bytes_after;
   unsigned long tmp_size;
   unsigned char *ret_prop;
   gchar *ret;

   xa_prop_name = XInternAtom(disp, prop_name, False);

   /* MAX_PROPERTY_VALUE_LEN / 4 explanation (XGetWindowProperty manpage):
   *
   * long_length = Specifies the length in 32-bit multiples of the
   *               data to be retrieved.
   */
   if (XGetWindowProperty(disp, win, xa_prop_name, 0, MAX_PROPERTY_VALUE_LEN / 4, False,
   xa_prop_type, &xa_ret_type, &ret_format,
   &ret_nitems, &ret_bytes_after, &ret_prop) != Success)
   {
   return NULL;
   }

   if (xa_ret_type != xa_prop_type)
   {
   XFree(ret_prop);
   return NULL;
   }

   /* null terminate the result to make string handling easier */
   tmp_size = (ret_format / 8) * ret_nitems;
   ret = (gchar *)g_malloc(tmp_size + 1);
   memcpy(ret, ret_prop, tmp_size);
   ret[tmp_size] = '\0';

   if (size)
   {
   *size = tmp_size;
   }

   XFree(ret_prop);
   return ret;
}