I've been learning about GType/GObject, and trying to create my own
objects. I'm attempting to derive a new object from a GtkWindow. While
the code compiles, I can't cast the object to a GtkWindow:
(ogcalc:14377): GLib-GObject-WARNING **: invalid uninstantiatable type
`<invalid>' in cast to `GtkWindow'
(ogcalc:14377): Gtk-CRITICAL **: file gtkwindow.c: line 953
(gtk_window_set_title): assertion `GTK_IS_WINDOW (window)' failed
(ogcalc:14377): GLib-GObject-WARNING **: invalid uninstantiatable type
`<invalid>' in cast to `GtkWindow'
(ogcalc:14377): Gtk-CRITICAL **: file gtkwindow.c: line 5878
(gtk_window_set_resizable): assertion `GTK_IS_WINDOW (window)' failed
(ogcalc:14377): GLib-GObject-WARNING **: invalid uninstantiatable
type `<invalid>' in cast to `GtkWidget'
(ogcalc:14377): Gtk-CRITICAL **: file gtkwidget.c: line 3409
(gtk_widget_reparent): assertion `GTK_IS_CONTAINER (new_parent)'
failed
I've attached a very small testcase which shows the problem. What am I
doing wrong when I construct the object? I'm doing this:
GType
ogcalc_get_type (void)
{
static GType type = 0;
if (type == 0)
{
static const GTypeInfo info =
{
sizeof (OgcalcClass),
NULL,
NULL,
(GClassInitFunc) ogcalc_init,
NULL,
NULL,
sizeof (Ogcalc),
0,
NULL
};
type = g_type_register_static (GTK_TYPE_WINDOW,
"Ogcalc",
&info,
0);
}
return type;
}
Many thanks,
Roger
--
Roger Leigh
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