Re: Gtk::Widget::on_hide

[Kjell Ahlstedt <kjell ahlstedt bredband net>]

No crash when I run it on Linux (Ubuntu 13.10). When on_hide() is 
called, gobject_ is not 0. I used gtkmm 2.24.4 instead of 2.24.2. I 
would be surprised if that matters.

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 ?

Kjell

2013-11-18 18:23, John Emmas skrev:
> On 18/11/2013 14:59, Alan Mazer wrote:
> > The G_OBJECT_GET_CLASS macro is probably dereferencing gobject_, 
> > e.g., replacing it with gobject_->class or some such...
>
> Perhaps so.  That would certainly explain the crash if 'gobject_' was 
> NULL - but as I try to debug this issue things become even more 
> confusing.  Consider this sample program:-
>
>         #include <gtkmm/main.h>
>         #include <gtkmm/dialog.h>
>
>         int main (int argc, char *argv[])
>         {
>             Gtk::Main    app (&argc, &argv);
>             Gtk::Dialog* mainWnd = new Gtk::Dialog ("Hello World", 
> true, true);
>
>             app.run( *mainWnd );
>
>             delete mainWnd;
>             return 0;
>         }
>
> The above example runs exactly as expected displaying a small, empty 
> dialog window entitled "Hello World".  Now consider this extended 
> example which uses a class derived from Gtk::Dialog:-
>
>         #include <gtkmm/main.h>
>         #include <gtkmm/dialog.h>
>
>         class MyDialog : public Gtk::Dialog {
>         public:
>             MyDialog (const Glib::ustring& title, bool modal, bool 
> use_separator);
>         };
>
>         MyDialog::MyDialog (const Glib::ustring& title, bool modal, 
> bool use_separator)
>             : Gtk::Dialog (title, modal, use_separator)
>         {
>         }
>
>
>         int main (int argc, char *argv[])
>         {
>             Gtk::Main    app (&argc, &argv);
>             MyDialog* mainWnd = new MyDialog ("Hello World", true, true);
>             app.run( *mainWnd );
>
>             delete mainWnd;  // <--- crashes here !!
>             return 0;
>         }
>
> When built using MSVC and gtkmm v2.24.2, the extended example 
> consistently crashes at the line "delete mainWnd;".  It either crashes 
> in Gtk::Widget::on_hide() or slightly later, in 
> Gtk::Widget::on_unrealize().  It's almost as if the C++ window object 
> is going out of scope before gtkmm has finished its cleanup. Could 
> this be a threading issue?  I haven't created any threads (as you can 
> see) so unless gtkmm or gtk+ created some I don't see how threading 
> could be the problem.  Or is there something obviously wrong which I'm 
> failing to see??
>
> John
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