Re: GObject - problem, as usual

[Lance Dillon <riffraff169 yahoo com>]

If I understand the problem correctly, you need to call the ancestor method's manually (regardless of whether 
it is a finalize methoed or anything else).  There is s section on it in the gobject documentation:

http://developer.gnome.org/doc/API/2.0/gobject/howto-gobject-chainup.html

----- Original Message ----
From: Tomasz Jankowski <tomcioj gmail com>
To: gtk-app-devel-list gnome org
Sent: Tuesday, August 1, 2006 6:10:15 AM
Subject: GObject - problem, as usual

Hi!

I'm writing some application based on GObject and I have problem when I'm
trying to destroy object. I have two object A and B, A derives from GObject
and B derives from A. I declared my own finalize methods for both objects,
but when I'm destroying B object only B finalize function is executed. When
I remowe B finlize function declaration from B_class_init () A finalize
function is executed normaly. Why B finalize method overrides A finalize
method and what should I do to remoe this overriding? Maybe some parts od my
code will be helpful:

GType A_get_type   (void)   {
   /*PRINT_DBG_IN_FUN_NAME*/

   static GType type = 0;
   if (type == 0) {
      static const GTypeInfo info = {
         sizeof (AClass),
         NULL,   /* base_init */
         NULL,   /* base_finalize */
         A_class_init,   /* class_init */
         NULL,   /* class_finalize */
         NULL,   /* class_data */
         sizeof (A),
         0,      /* n_preallocs */
         NULL    /* instance_init */
      };
      type = g_type_register_static (G_TYPE_OBJECT,
                                     "AType",
                                     &info, 0);
   }
    return type;
}

GType B_get_type   (void)   {
   /*PRINT_DBG_IN_FUN_NAME*/

   static GType type = 0;
   if (type == 0) {
      static const GTypeInfo info = {
         sizeof (BClass),
         NULL,   /* base_init */
         NULL,   /* base_finalize */
         B_class_init,   /* class_init */
         NULL,   /* class_finalize */
         NULL,   /* class_data */
         sizeof (B),
         0,      /* n_preallocs */
         NULL    /* instance_init */
      };
      type = g_type_register_static (A_TYPE,
                                     "BType",
                                     &info, 0);
   }
    return type;
}

static void B_class_init    (gpointer g_class,
                                      gpointer class_data)
{
   PRINT_DBG_IN_FUN_NAME
   GObjectClass   *class = G_OBJECT_CLASS (g_class);
   GParamSpec     *spec;

   g_type_class_add_private (class, sizeof (BPrivate));

   class->constructor = B_constructor;
   class->dispose = B_dispose;
   class->finalize = B_finalize;
   class->set_property = B_set_property;
   class->get_property = B_get_property;
   /* other code */
}

static void A_class_init   (gpointer g_class,
                                     gpointer class_data)
{
   PRINT_DBG_IN_FUN_NAME
   GObjectClass   *class    = G_OBJECT_CLASS (g_class);
   GParamSpec     *spec;

   class->finalize = A_finalize;
   class->set_property = A_set_property;
   class->get_property = A_get_property;
   /* other code */
}

I changed objects names, to make it more legible. PRINT_DBG_IN_FUN_NAME is a
macro, which display function name in console. Here is otput of running
'g_object_unref (g_object_new (A_TYPE, NULL))'. This is program output:

Function: A_class_init
Function: B_class_init
Function: B_constructor
Function: B_dispose
Function: B_finalize

I noticed, that in both *_class_init fnctions I use GObjectClass to declare
finalize, constructor etc. functions on it, is this main reason of my
problem?

-- 
Pozdrawiam!
Tom
_______________________________________________
gtk-app-devel-list mailing list
gtk-app-devel-list gnome org
http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list