> *- Is there a way to pass a function to free certain struct in a > GtkTreeModel so GTK frees the allocated space when the model's reference > count reach to 0? (without registering it as a G_TYPE).* >
One way is to register the struct as a "weak reference" to the model, using g_object_weak_ref. See: http://developer.gnome.org/doc/API/2.0/gobject/gobject-The-Base-Object-Type.html > *- When reference count starts? I read somewhere that it starts when you > add the widget into a container, is it always this way??? Eg:* > Reference counting starts when an object is created. In your example: GtkWidget *entry = gtk_entry_new (); After this statement, there is one reference to the entry. When gtk_container_add is invoked, it takes over ownership of this reference. That is when the container is destroyed, g_object_unref is invoked on the entry. So one needs to invoke destroy only on the root widget (typically). > //*No reference counting on GtkEntry*// > GtkWidget *entry = gtk_entry_new (); > //*Reference counting starts here *// > gtk_container_add (GTK_CONTAINER (window), entry);/ > /* Another doubt: in this case, reference couting starts with 1 or 2? */ > / > -* If i get a string from a GtkTreeModel, it gives me a copy or the > actual pointer to the data? > If you're using the get_value method on the iterator, the object is "copied" into the GValue supplied. Typically this gives you just a reference, and invoking g_value_unset results in just decrementing the reference count. But what exactly happens during copying depends on your object. See: http://developer.gnome.org/doc/API/2.0/gobject/gobject-Generic-values.html > *That's it, thanks in advance. Matias. > _______________________________________________ > gtk-app-devel-list mailing list > gtk-app-devel-list@gnome.org > http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list > _______________________________________________ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
