Re: GtkSwitch — lack of specific signal

[Colomban Wendling <lists ban herbesfolles org>]

Le 05/03/2011 03:17, John Lumby a écrit :
> 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).
Check the documentation [1] ;)
For example, for GtkWidget's signals see [2] or for GtkWindow see [3]...
and so on.

Cheers,
Colomban

[1] http://library.gnome.org/devel/gtk/stable/
[2]
http://library.gnome.org/devel/gtk/stable/GtkWidget.html#GtkWidget.signal-details
[3]
http://library.gnome.org/devel/gtk/stable/GtkWindow.html#GtkWindow.signal-details

> Cheers,   John
>
> > Subject: RE: GtkSwitch — lack of specific signal
> > From: tadeboro gmail com
> > To: johnlumby 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
> > tadeboro gmail com
> > tadej borovsak gmail com