Re: GtkComboBoxEntry Vs GtkComboBox

["Peter E Dennis" <peter edwin dennis gmail com>]

Thanks again Claudio for taking the time to explain that to me.  Much
appreciated.

On 23/01/2008, Claudio Saavedra <csaavedra alumnos utalca cl> wrote:
> El mié, 23-01-2008 a las 06:09 +1100, Peter E Dennis escribió:
> > Thanks Claudio.
> >
> > I'm just wondering why do I use the GTK_COMBO_BOX macro and not the
> > GTK_COMBO_BOX_ENTRY macro?
>
> Because gtk_combo_box_append_text () is a function that works on
> GtkComboBox objects, not GtkComboBoxEntry ones.
>
> As GtkComboBoxEntry inherites from GtkComboBox, you can use functions
> from the parent class in your GtkComboBoxEntry instance, but you need to
> cast it, given that C can't do it itself. A little pain of using GObject
> and C :-)
>
> Claudio
>
> > Many thanks,
> >
> > Peter.
> >
> >
> >
> > On 23/01/2008, Claudio Saavedra <csaavedra alumnos utalca cl> wrote:
> > > El mar, 22-01-2008 a las 21:55 +1100, Peter E Dennis escribió:
> > > > So I wondered if I needed to cast my GtkComboBoxEntry to a GtkComboBox
> > > > but wasn't sure how to do this so I tried:
> > > >
> > > > gtk_combo_box_append_text(GTK_COMBO(cboVocSource), "Hello World");
> > > >
> > > > This however makes matters worse as I get the above warning still when
> > > > I compile it, but now when I run it I get:
> > > > $ ./box
> > > >
> > > > (box:11338): GLib-GObject-WARNING **: invalid cast from
> > > > `GtkComboBoxEntry' to `GtkCombo'
> > > >
> > > > Can someone please tell me what I'm doing wrong?
> > >
> > > You need to cast to a GtkComboBox, not to a GtkCombo. Use the
> > > GTK_COMBO_BOX macro.
> > >
> > > Claudio
> > >
> > > --
> > > Claudio Saavedra <csaavedra alumnos utalca cl>
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> > gtk-app-devel-list gnome org
> > http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
> --
> Claudio Saavedra <csaavedra alumnos utalca cl>