Re: lookup_widget trouble

[Joop Stakenborg <pa3aba xs4all nl>]

Op wo 01-01-2003, om 18:50 schreef Federico Vezzani:
> Hello,
> I'm new to GTK. At the moment I'm just trying to have a GTKButton that,
> when clicked, sets a message text to a GTKEntry.
>
> Here's my code in callbacks.c
> <snip>
> void
> on_button1_clicked                    (GtkButton       *button,
>                                         gpointer         user_data)
> {
>         GtkWidget *entry1;
>         entry1 = lookup_widget(GTK_WIDGET(entry1), "entry1");

This should be:

entry1 = lookup_widget(GTK_WIDGET(widget), "entry1");

Where widget is the pointer to the toplevel widget of your dialog or
window. You can get it by calling

widget = gtk_widget_get_toplevel (GTK_WIDGET (button))

>         gtk_entry_set_text(GTK_ENTRY(entry1), "abc");
> }
> </snip>
>
> It compiles fine, but when I run it, the program crashes.
> I'm sure there's something wrong with the lookup_widget method but I
> can't understand what.

It crashes because you are trying to set an entry of a non-existing
widget.

> Can anybody help me please?
>
> Thank you
> Fred

Hope this helps.

Regards,
Joop