Thanks for answering. So basically...
(About the g_object_weak_ref)
GDate *date = g_date_new_dmy (1,1,2006);
GtkEntry *entry = gtk_entry_new ();
g_object_weak_ref (G_OBJECT (entry),
(GWeakNotify) g_date_free,
date);
After doing this, before entry is freed gtk would call g_date_free and
free date. Am i wrong? I tried this with a GWeakNotify function that
just prints something, but it didn't seem to work.
There's something else, i want to add more reference to other dates, to
new ones, if i want them to be week referenced i'd have to call
g_object_add_weak_pointer (
<http://developer.gnome.org/doc/API/2.0/gobject/gobject-The-Base-Object-Type.html#GObject>G_OBJECT
(entry), another_date);
or
g_object_weak_ref again?
Thanks anyway! Matias
Nikhil Dinesh escribió:
>> *- 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.
>> _______________________________________________
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>> gtk-app-devel-list@gnome.org
>> http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
>>
>>
>
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