Re: Gtk::Widget::on_hide

[John Emmas <johne53 tiscali co uk>]

On 18/11/2013 19:16, John Emmas wrote:
> On 18/11/2013 18:32, Kjell Ahlstedt wrote:
> > Seems quite similar to the problem you described in
> > https://mail.gnome.org/archives/gtkmm-list/2013-November/msg00000.html
> > Have you got any further with the trouble-shooting after
> > https://mail.gnome.org/archives/gtkmm-list/2013-November/msg00024.html ?
>  You're right, it's exactly the same issue.  [...]  I'll resume my 
> trouble-shooting on that previous issue and report back what I find.

Okay, it only took a few minutes to resume my trouble-shooting so I've 
just added an update about what I found.

Getting back to the "MyDialog" example I supplied yesterday, this is the 
sequence of function calls when closing MyDialog on my system:-

1)  Gtk::Widget::on_hide() // occurs on window closure (BEFORE the call 
to delete).  Therefore 'gobject_' is still valid
2)  Window::_destroy_c_instance()  // occurs during the call to 'delete' 
and subsequently calls....
3)  Object::disconnect_cpp_wrapper()  // invalidates 'gobject_' (sets it 
to NULL)
4)  Gtk::Widget::on_unrealize() // crashes because gobject_ == NULL

Kjell, if you can find some time today could you try building MyDialog 
and verify if you see the same sequence?  If you do, we'll need to 
figure out why your gcc build is tolerant of gobject_ being NULL whereas 
my MSVC build isn't.  I feel as if we're getting quite close to a 
solution though.  Many thanks.

John