Re: Crashing with widgets as class members

[Bob Caryl <bob fis-cal com>]

If you include a widget in a class where that widget's instantiation 
would occur before Gtk has been initialized, you will see this 
behavior.  You need to include your classes as pointers and not 
instantiate them until you're actually ready for them to come into 
existance.

Bob Caryl

John C. Spray wrote:

> Hello,
>
> I'm having crashes where I have widgets which created as members of a
> class, rather than creating them with Gtk::manage(new Gtk::whatever).
> This used to work okay, the code hasn't changed but the build options
> may have done.
>
> Am I doing something illegal when I do:
>
> class MyClass {
> 	public:
> 	Gtk::ComboBoxText mycombo_;
> }
>
> Rather than
>
> class MyClass {
> 	public:
> 	Gtk::ComboBoxText *mycombo_;
> 	void build();
> }
>
> void MyClass::build() {
> 	mycombo_ = Gtk::manage(new Gtk::ComboBoxText);
> }
>
> Because the latter seems to work where the first kind of thing gives
> results like:
>
> #0  IA__g_logv (log_domain=Variable "log_domain" is not available.
> ) at gmessages.c:503
> #1  0x003f5963 in IA__g_log (log_domain=0x3ba01e "glibmm",
>    log_level=G_LOG_LEVEL_ERROR,
>    format=0x419d98 "file %s: line %d (%s): assertion failed: (%s)")
>    at gmessages.c:517
> #2  0x003f59b8 in IA__g_assert_warning (log_domain=0x3ba01e "glibmm",
>    file=0x3baab7 "objectbase.cc", line=77,
>    pretty_function=0x3ca180 "void
> Glib::ObjectBase::initialize(GObject*)",
>    expression=0x3baaa2 "gobject_ == castitem") at gmessages.c:552
> #3  0x003afc1f in Glib::ObjectBase::initialize (this=Variable "this" is
> not available.
> ) at objectbase.cc:77
> #4  0x003af5ee in Object (this=0x9cf4070, __vtt_parm=0x898545c,
>    construct_params= 0xbf8fa460) at object.cc:232
> #5  0x0063585b in Object (this=0x9cf4038, __vtt_parm=0x8985458,
>    construct_params= 0xbf8fa460) at object.cc:35
> #6  0x00681f6b in Widget (this=0x9cf4038, __vtt_parm=0x8985454,
>    construct_params= 0xbf8fa460) at widget.cc:5041
> #7  0x006067d8 in Container (this=0x9cf4038, __vtt_parm=0x8985450,
>    construct_params= 0xbf8fa460) at container.cc:674
> #8  0x005ee074 in Bin (this=0x9cf4038, __vtt_parm=0x898544c,
>    construct_params= 0xbf8fa460) at bin.cc:195
> #9  0x00603d4b in ComboBox (this=0x9cf4038, __vtt_parm=0x8985448,
>    construct_params= 0xbf8fa460) at combobox.cc:200
> #10 0x006058ff in ComboBoxEntry (this=0x9cf4038, __vtt_parm=0x8985444)
>    at comboboxentry.cc:141
> #11 0x0069656f in ComboBoxEntryText (this=0x9cf4038) at
> comboboxentrytext.cc:33
> #12 0x086bd5da in lyx::frontend::GBibtex::GBibtex ()
>
> Where GBibtex is a class with a member of type Gtk::ComboBoxEntry.
>
> Regards,
> John
>
> _______________________________________________
> gtkmm-list mailing list
> gtkmm-list gnome org
> http://mail.gnome.org/mailman/listinfo/gtkmm-list
>
>  

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