Getting main window position

[Markus Lausser <sgop users sourceforge net>]

Hello.
 
On exit i write some geometry information to disk. I get the position of the
main
window with:
  if (global_win->window) {
    gdk_window_get_origin (global_win->window, &x, &y);
  }
 
But this does not work, if i close the application via the windowmanager
(the X button), then the global_win->window == NULL.

Is there any way to get the window position if widget->window == NULL ?