Re: Seg Fault on NULL strlen

[Steve & Patti Getzinger <psatg bluemarble net>]

Patrice St-Gelais wrote:

> Hi,
>
> Check if "entry2" is defined the first time "on_entry1_changed" is executed.
>
> Maybe the callback is activated when you initialize the value of entry1,
> before creating entry2, or something like this.
>
> If it's the case, inserting a test to get out of the callback if entry2 is
> NULL, before casting it with GTK_EDITABLE, would solve the seg fault.  If I
> understand your code and your explanation, "entry1" shouldn't be NULL at
> this point, and should be equal to "editable" because "on_entry1_changed" is
> connected to "entry1".
>
> Regards,
>
> Patrice St-Gelais
> ________________________________
>
> Steve & Patti Getzinger a écrit :
>
>  
>
> > I am attempting to set sensitivity based on entries in 3 entry boxes. So
> > basically the first is easy. I am hitting a func on changed of entry1 in
> > the func I am doing an
> >
> >    
> >
> > > void
> > > on_entry1_changed                (GtkEditable     *editable,
> > >                                        gpointer         user_data)
> > > {
> > >  if(strlen(gtk_editable_get_chars(GTK_EDITABLE(entry1),0,-1)) > 7)
> > >        {
> > >
> > > if(strlen(gtk_editable_get_chars(GTK_EDITABLE(entry2),0,-1)) > 0)
> > >      
> > >
> > >                        {
> > >                        gtk_widget_set_sensitive (button1, TRUE);
> > >                        }
> > >        }else{
> > >                gtk_widget_set_sensitive (button1, FALSE);
> > >        }
> > > }
> > >      
> > With this config it seg faults with:
> >
> >    
> >
> > > (gdiald:16598): GLib-GObject-WARNING **: invalid cast from (NULL)
> > > pointer to `GtkEditable'
> > >
> > > (gdiald:16598): Gtk-CRITICAL **: file gtkeditable.c: line 125
> > > (gtk_editable_get_chars): assertion `GTK_IS_EDITABLE (editable)' failed
> > > Segmentation fault
> > >      
> > I am assuming strlen returns NULL if there has been no entry made in
> > entry2. How do I get around this one?
> >
> > TIA
> > Steve
> >
> >    
Signal connects all are listed at the end of window configs so entry2 is 
already created. Is there a way for me to tap the entries involved and 
do an if based on changed? I am not controlling the order entries are 
made so I need to be able to tap all 3 as all three need entries. This 
way if it has not been touched (changed) we exit the func with a false 
setting for sensitivity. If it has we check for size of entry and progress.

TIA
Steve