Re: stupid question?

[Dietmar Maurer <dietmar ximian com>]

You are mixing two different things. There are GtkObjects like:

BonoboPropertyBag
BonoboControlFrame

and there are CORBA_Objects:

Bonobo_PropertyBag
Bonobo_ControlFrame

Can you se the difference?

- Dietmar

Erik Bågfors wrote:

> On 20 May 2001 14:11:26 +0200, Dietmar Maurer wrote:
> > Erik Bågfors wrote:
> >
> > > Hi!
> > >
> > > Here is a stupid question (perhaps).
> > >
> > > I've been playing around alittle in bonobo and it's really sweet :).
> > >
> > > If I understand things correctly here is parts of how the classes hang
> > > together..
> > >
> > > GtkObject ->    BonoboObject ->         BonoboXObject
> > >                             |-> BonoboPropertyBag
> > >                             |-> BonoboControlFrame
> > >
> > > The thing I don't understand is that the I can convert the BonoboControlFrame
> > > to a GtkObject using GTK_OBJECT(control_frame) but I cannot convert the
> > > BonoboPropertyBag to a GtkObject with GTK_OBJECT.
> >
> > A PropertyBag is a GtkObject, so GTK_OBJECT(property_bag) should work without
> > any problems. Maybe something else is wrong with your code.
> >
>
> Good, thanks, then maybe you (or someone else) can explain this.
>
> I'm playing around with the code in the bonobo-tutorial (ipctrl).  This is from test-container.c
> in function install_property_bag_listener.  I only added three lines (four with the comment :) )
> to the code (just as a try).  This doesn't break the code since I don't use the GtkObject I add.
>
> Anyway.  I added a GtkObject named testA and then tried to do a GTK_OBJECT on the prop_bag.  This
> code gives me two Gtk-WARNING's
>
> Gtk-WARNING **: invalid cast from `(unknown)' to `GtkObject'
>
> Gtk-WARNING **: invalid cast from `(unknown)' to `GtkObject'
>
> ------
>
> static Bonobo_PropertyBag      prop_bag = CORBA_OBJECT_NIL;
>
> static void
> install_property_bag_listener (BonoboWidget *control, BonoboWindow *bonobo_win)
> {
>         Bonobo_Listener corba_listener;
>         BonoboListener *listener;
>         BonoboControlFrame *control_frame;
>         CORBA_Environment ev;
>         GtkObject *testA; /* I added this */
>
>
>         CORBA_exception_init (&ev);
>
>         /*
>          *  the property bag is associated with the control frame, so get a
>          *  control frame first
>          */
>         control_frame = bonobo_widget_get_control_frame(BONOBO_WIDGET(control));
>         if (!control_frame)
>                 g_error ("can't find control frame\n");
>
>         /*
>          * now, get a ref to the property bag
>          */
>         prop_bag = bonobo_control_frame_get_control_property_bag (control_frame, NULL);
>
>         /* I added the following two lines */
>         testA = GTK_OBJECT(&prop_bag); /* Try one.. gives one warning */
>         testA = GTK_OBJECT(prop_bag);  /* Try two gives another warning :( */
>
>         if (prop_bag == CORBA_OBJECT_NIL)
>                 g_error ("can't connect to property bag\n");
>
>         /*
>          * connect a listener to the property-bag
>          */
>         bonobo_event_source_client_add_listener (prop_bag, on_prop_changed,
>                                                  "Bonobo/Property:change:octet1", NULL, bonobo_win);
>         CORBA_exception_free (&ev);
> }
>
> ----
>
> As you can see the propertybag is correct since I use it later and the
> propgram works.
>
> So, what am I doing wrong?