Re: [gtk-list] Re: Force refresh/exposure

[Havoc Pennington <hp redhat com>]

On Tue, 20 Jul 1999, Erik Mouw wrote:
> > - and to force the exposure by a 
> >   gtk_signal_emit_by_name(GTK_OBJECT(label), "expose_event");
> >   but it does a segmentation fault.
> 
> Sounds like a wild/dangling pointer. Have you tried running your program
> in a debugger? Compile and link with the "-g" option and run your program
> in gdb. When you get a segfault, simply type "where" and the debugger will
> show you the point where your program crashed.
> 

You should just delete this line of code, but for education purposes, the
problem is that expose events take an argument and have a return value, so
if you were to emit one this way you'd have to put those in the arg list,
like:

gtk_signal_emit_by_name(widget, "expose_event", 
                        &an_expose_event_struct, &int_return_value);

but, you shouldn't go around emitting random events manually; you have to
use the API to emit them, in this case gtk_widget_event().

Havoc