Re: Glib errors while deleting Gtk::ComboBoxEntryText. help needed

[michi7x7 <mailing-lists michi7x7 de>]

Hi,

As you should know, the GTKmm-Libraries are only wrappers of the 
C-Libraries.
These have been in use for about 10 years, and should be stable at all.

The only thing that you can really do wrong in GTKmm, is to use threads
to call GTK-Functions in them as GTKmm is (because of GTK) not thread-save.
This will result in GTK or Glib::Mainloop-Errors, or simply undefined 
behaviour.

Moreover you should be able to reduce the code to locate the error. 
Simplest way
is to use a debugger, export the variables and rewrite the small active 
code-part
with use of this exported Variables.

With regards

Michi

> Well, I'm afraid I cant.
> Anyway Its a quite complex system with about 4 libraries involved on this
> specific content-change event. I can not reproduce the problem in a reduced
> code of similar characteristics.
>
> I thought it could be a Gtkmm issue because, as I said, there where
> different Glib errors reported, only changing the connected widget's signal.
> I can also say that my program still works as expected, as if the Glib
> errors had no effect.
>
> I can say as a clue that I delete the combo box widget, its container and
> other widgets that can be related in one or other way with the combo box
> while I'm still processing the signal changed event callback. I'm not really
> sure if this behavior is supported, but I suppose I can delete a button
> widget while processing its button pressed callback function, and this is
> the same use case.
>
> I know its pretty difficult to give any help without seeing the code. Tell
> me if I can do anything else it can help you. Meanwhile I'll continue
> debugging the problem and if finally is a Gtkmm issue I'll make a small
> program to illustrate it.
>
> Thanks anyway.
>
>
> Галымжан Кожаев wrote:
>    
> > Could you send a piece of your code ?
> >
> > 2010/1/15, siagogam<siagogam terra es>:
> >      
> > > Hi to all:
> > >
> > > Im just getting this error while deleting the Gtk::ComboBoxEntryText
> > >
> > > GLib-GObject-WARNING **: instance with invalid (NULL) class pointer
> > > GLib-GObject-CRITICAL **: g_signal_handlers_unblock_matched: assertion
> > > `G_TYPE_CHECK_INSTANCE (instance)' failed
> > > GLib-GObject-CRITICAL **: g_object_notify: assertion `G_IS_OBJECT
> > > (object)'
> > > failed
> > >
> > > i've been debugging a little bit my program and i've concluded that if I
> > > will get this error if I try to release the widget while gtkcombo ->
> > > get_entry() ->  signal_changed() is still connected
> > >
> > > if I connect the gtkcombo ->  signal_changed() instead of connecting
> > > gtkcombo
> > > ->  get_entry() ->  signal_changed() i get this error:
> > >
> > > GLib-GObject-CRITICAL **: g_object_notify: assertion `G_IS_OBJECT
> > > (object)'
> > > failed
> > >
> > > so probably this last one has nothing to do with the other two.
> > >
> > > Is there a known bug on this issue?
> > > am i doing something wrong?
> > >
> > > any kind of help or idea is appreciated.
> > >
> > > thanks in advance
> > >
> > >
> > > --
> > > View this message in context:
> > > http://old.nabble.com/Glib-errors-while-deleting-Gtk%3A%3AComboBoxEntryText.-help-needed-tp27168573p27168573.html
> > > Sent from the Gtkmm mailing list archive at Nabble.com.
> > >
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