exiting app doesn't seem to work as documented

["Karl H. Beckers" <karl beckers sun com>]

Hi all,

trying to build this gtk2 GUI with glade, but it won't quit
properly.

If I make the delete event return FALSE, it still doesn't seem
to trigger the destroy event (correctly) and seems to loop in
g_main_context_dispatch. I always need to CTRL-C, though the
window dissappears.
(find gdb session below)
What completely beats me is that I get the HelloWorld example
from the docs to do it.

If I explicitly call on_window1_destroy_event from my delete
callback (prior to the return, of course) and have gtk_main_quit()
and exit() in the destroy callback things kinda work but it seems
awkward and like it should work differently.
(Also, if I leave away the exit(0) and want to return to main(),
I get a segfault.)


All hints or rtfms welcome,
TIA,

Karl.


Here are my callbacks:

> gboolean
> on_window1_delete_event                (GtkWidget       *widget,
>                                         GdkEvent        *event,
>                                         gpointer         user_data)
> {
>                                                                                                                              
>         g_print("delete event occurred!\n");
> //      gtk_signal_emit_by_name((GtkObject*) widget, "destroy_event");
>         return FALSE;
> }
>                                                                                                                              
>                                                                                                                              
> gboolean
> on_window1_destroy_event               (GtkWidget       *widget,
>                                         GdkEvent        *event,
>                                         gpointer         user_data)
> {
>                                                                                                                              
>         g_print("destroy event occurred!\n");
>         gtk_main_quit ();
> //  return FALSE;
> }
>                                                                                                                              

set up like this:

>   g_signal_connect ((gpointer) window1, "delete_event",
>                     G_CALLBACK (on_window1_delete_event),
>                     NULL);
>   g_signal_connect ((gpointer) window1, "destroy_event",
>                     G_CALLBACK (on_window1_destroy_event),
>                     NULL);

and main.c:

> int
> main (int argc, char *argv[])
> {
>   GtkWidget *window1;
>   GtkWidget *dialog1;
>                                                                                                                              
> #ifdef ENABLE_NLS
>   bindtextdomain (GETTEXT_PACKAGE, PACKAGE_LOCALE_DIR);
>   bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");
>   textdomain (GETTEXT_PACKAGE);
> #endif
>                                                                                                                              
>   gtk_set_locale ();
>   gtk_init (&argc, &argv);
>                                                                                                                              
>   add_pixmap_directory (PACKAGE_DATA_DIR "/" PACKAGE "/pixmaps");
>                                                                                                                              
>   /*
>    * The following code was added by Glade to create one of each component
>    * (except popup menus), just so that you see something after building
>    * the project. Delete any components that you don't want shown initially.
>    */
>   window1 = create_window1 ();
>   gtk_widget_show (window1);
> //  dialog1 = create_dialog1 ();
> //  gtk_widget_show (dialog1);
>                                                                                                                              
>   gtk_main ();
>   exit (0);
>   return 0;
> }


gdb session:

> kb87850 ono-sendai(570)> gdb project2
> GNU gdb 2002-04-01-cvs
> Copyright 2002 Free Software Foundation, Inc.
> GDB is free software, covered by the GNU General Public License, and you are
> welcome to change it and/or distribute copies of it under certain conditions.
> Type "show copying" to see the conditions.
> There is absolutely no warranty for GDB.  Type "show warranty" for details.
> This GDB was configured as "i386-linux"...
> (gdb) break on_window1_delete_event
> Breakpoint 1 at 0x804d67b: file callbacks.c, line 20.
> (gdb) break on_window1_destroy_event
> Breakpoint 2 at 0x804d693: file callbacks.c, line 31.
> (gdb) run
> Starting program: /export/home/kb87850/Projekte/project2/src/project2
> delete event occurred!
>  
> Breakpoint 1, on_window1_delete_event (widget=0x8084318, event=0x80e81a8, user_data=0x0) at callbacks.c:20
> 20              return FALSE;
> (gdb) s
> 0x400da412 in _gtk_marshal_BOOLEAN__BOXED () from /usr/lib/libgtk-x11-2.0.so.0
> (gdb) s
> Single stepping until exit from function _gtk_marshal_BOOLEAN__BOXED,
> which has no line number information.
> 0x40346e2b in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
> (gdb) s
> Single stepping until exit from function g_closure_invoke,
> which has no line number information.
> 0x40359f23 in g_signal_emit_by_name () from /usr/lib/libgobject-2.0.so.0
> (gdb) s
> Single stepping until exit from function g_signal_emit_by_name,
> which has no line number information.
> 0x40358807 in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0
> (gdb) s
> Single stepping until exit from function g_signal_emit_valist,
> which has no line number information.
> 0x403671d0 in g_value_transforms_init () from /usr/lib/libgobject-2.0.so.0
> (gdb) s
> Single stepping until exit from function g_value_transforms_init,
> which has no line number information.
> 0x4035895e in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0
> (gdb) s
> Single stepping until exit from function g_signal_emit_valist,
> which has no line number information.
> 0x40358a45 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
> (gdb) s
> Single stepping until exit from function g_signal_emit,
> which has no line number information.
> 0x40195f02 in gtk_widget_send_expose () from /usr/lib/libgtk-x11-2.0.so.0
> (gdb) s
> Single stepping until exit from function gtk_widget_send_expose,
> which has no line number information.
> 0x40195b60 in gtk_widget_event () from /usr/lib/libgtk-x11-2.0.so.0
> (gdb) s
> Single stepping until exit from function gtk_widget_event,
> which has no line number information.
> 0x400d91ed in gtk_main_do_event () from /usr/lib/libgtk-x11-2.0.so.0
> (gdb) s
> Single stepping until exit from function gtk_main_do_event,
> which has no line number information.
> 0x4026c6ad in _gdk_events_queue () from /usr/lib/libgdk-x11-2.0.so.0
> (gdb) s
> Single stepping until exit from function _gdk_events_queue,
> which has no line number information.
> 0x4039bf59 in g_get_current_time () from /usr/lib/libglib-2.0.so.0
> (gdb) s
> Single stepping until exit from function g_get_current_time,
> which has no line number information.
> 0x4039cd77 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
> (gdb) s
> Single stepping until exit from function g_main_context_dispatch,
> which has no line number information.
>  
>  
>  
> Program received signal SIGINT, Interrupt.
> 0x404a9bb0 in poll () from /lib/libc.so.6
> (gdb) q