Re: lookup_widget problems

[Mike Hearn <m hearn signal qinetiq com>]

On Tue, 2003-06-10 at 19:13, Karl Lattimer wrote:
> Hi, i've just started using glade. I'm finding it quite easy to use
> apart from a problem i'm having in a callback function.
>
> The problem is as follows.
>
> I created a signal handler as follows
>
> Signal: Clicked
> Handler: on_b_calendarOk_clicked
> Object: w_calendar
>
> NOTE: Without object set to w_calendar the program segfaulted at
> lookup_widget.
>
> I then wrote the code for the function as follows
>
> void
> on_b_calendarOk_clicked                (GtkButton       *button,
>                                         gpointer         user_data)
> {
>   GtkWidget *w_calendar;
>
>   w_calendar = lookup_widget(GTK_WIDGET (w_calendar), "w_calendar");
>   gtk_widget_hide(w_calendar);
> }

This looks wrong - you are passing an uninitialised pointer to
lookup_widget. It should be:

w_calendar = lookup_widget(GTK_WIDGET (button), "w_calendar");

Of course you should be using libglade anyway rather than generated code
really....

> This worked fine, hiding the calendar window (w_calendar) when the OK
> button was clicked.

I'm not sure how, that code shouldn't work...... 

-- 
Mike Hearn <m hearn signal qinetiq com>
QinetiQ - Malvern Technology Center