Re: Is this OK?

[Jeffrey Goddard <moosewood mooseroot org>]

On Wednesday 31 July 2002 19:43, TP Muller wrote:
> On Thursday 01 August 2002 01:08, vladimir wrote:
> > void kstudentnew_quit_cb (GtkWidget *widget, gpointer callback_data)
> > {
> >     gtk_widget_destroy ((GtkWidget *)callback_data);/* destroy main
> >     window */
> > }
> >
> > Can I cast callback_data like this? Main window is not main for app, but
> > for entry dialog for some data. When user cancel this window it calls
> > this callback. Is there cleaner way, or can go with this one?
>
> You can do it like this, although it would probably be better to use the
> predefined macros, which also have the advantage that they check whether
> the pointer cast really points to a structure of the appropriate type
> (which is invaluable when you try to find a bug where the pointer contains
> bogus data).
>
> => GTK_WIDGET(callback_data)
>
> Cheers
> -Tim
the question that pops into my mind is - are you really done with the widget? 
if not, you will probably have to recreate it if the user wants to enter more 
data. if you use gtk_widget_hide(...) instead, you can always do 
gtk_widget_show(...) to enter more data.
Jeffrey
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