Ahhhh! Thank you Tadej. No, mine had only two parameters, the obj ptr
and the data ptr.I added the paramspec in between and now all works perfectly.
By the way - this seems a bit unpleasant, that some callbacks have a
prototype of (objptr, dataptr) and others have (objptr, paramspec,
dataptr).How would I know which one to use? Is it that some are in the gtk
layer (2 params) but other like notify::active are in the gdk layer (3
params)?And I kind of feel something should have alerted me although I don't
know what - I guess the compiler doesn't know.
I suppose this is all described somewhere - where? (I am new to gtk
application programming).
Cheers, John
> Subject: RE: GtkSwitch — lack of specific signal
> From: tadeb...@gmail.com
> To: johnlu...@hotmail.com
> CC: gtk-app-devel-list@gnome.org
> Date: Sat, 5 Mar 2011 02:50:05 +0100
>
> Hello.
>
> > Thanks both. I tried notify::active and it works as well as event-after
> > but still the data pointer argument is bad on entry to the callback(it's
> > not zero but not a valid GTK_WIDGET either). I don't know why - maybe
> > something related to GtkSwitch or maybe a mistake in my code somewhere.
> > Cheers, John Lumby
>
> Are you sure your functions has the right prototype? GObject::notify
> signal handlers should have callbacks defined like this:
>
> void
> notify_callback (GObject *obj,
> GParamSpec *pspec,
> gpointer *data)
> {
> /* La la la */
> }
>
> Cheers,
> Tadej
>
> --
> Tadej Borovšak
> tadeboro.blogspot.com
> tadeb...@gmail.com
> tadej.borov...@gmail.com
>
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