Re: Destroy signal not working on GtkMenuItem?

[Henri Torgemane <henrit yahoo-inc com>]

I believe  gtk_signal_connect() sends arguments to the signal function in the
(GtkWidget* widget, gpointer data) order, while gtk_signal_connect_object() sends
them in the (gpointer data, GtkWidget* widget) order, which allows to plug directly
into some functions without having to write a middle-man function that only
re-arrange the order.
Since the handler gets cast, if you use the wrong function prototype, you don't get
any advance warning until it crashes.


Henri


learfox furry ao net wrote:

> > lfan> I tried to use the "destroy" signal handling in the same situation for a
> > lfan> GtkMenuItem, however it segfaults and gdb seems to show the inputs are no
> > lfan> the same to the signal handler function.
> >
> > That's  a  strange  behaviour.  Here  is  an  example which shows that
> > the   "destroy"   signal   is   sent  to  the  GtkMenuItem  when  you
> > gtk_widget_destroy it:
> >
> > # include <gtk/gtk.h>
> >
> > void warn (GtkWidget *);
> >
> > int
> > main (int argc, char **argv)
> > {
> >   GtkWidget *win, *menubar, *file;
> >
> >   gtk_init (&argc, &argv);
> >   win = gtk_window_new (GTK_WINDOW_TOPLEVEL);
> >
> >
> >   menubar = gtk_menu_bar_new ();
> >   file = gtk_menu_item_new_with_label ("File");
> >   gtk_signal_connect (GTK_OBJECT (file),
> >                       "destroy",
> >                       GTK_SIGNAL_FUNC (warn),
> >                       NULL);
> >
> >   gtk_signal_connect_object (GTK_OBJECT (win),
> >                              "delete_event",
> >                              GTK_SIGNAL_FUNC (gtk_widget_destroy),
> >                              GTK_OBJECT (file));
>
> Here's something interesting, what's the difference between
> gtk_signal_connect() and gtk_signal_connect_object()? Which one should I
> use under what circumstances?
>
> I think the problem is that I was using gtk_signal_connect_object()
> for the "destroy" event.