Gtk+ memory management
Hello.
Can you help me and answer some questions about memory management in Gtk+?
Look at next function:
1 void
2 tbar_makemenu (gint button)
3 {
4 const gchar *sid;
5 GList *list = NULL;
6
7 tbar_widget.menu[button] = gtk_menu_new ();
8 if (button == SID)
9 fdir_getext (filesdir, &list);
15 g_list_foreach (list, (GFunc) &list_menu_additem, &button);
16 g_list_free_full (list, &g_free);
17 gtk_widget_show_all (tbar_widget.menu[button]);
18 gtk_menu_tool_button_set_menu (GTK_MENU_TOOL_BUTTON
(tbar_widget.button[button]), tbar_widget.menu[button]);
19 }
My questions:
1) line 7 creates new GtkMenu, its child of GInitiallyUnowned, so
refcount = 1, but it is floating reference. True?
2) line 18 reference this menu with GtkMenuToolButton, so refcount =
1, and it is now not floating. True?
3) When I call this function 2nd time, and reference toolbutton with
new menu in line 18, what will happen? Old menu will get refcount = 0
and will be destroyed, or it is memory leak?
4) Will be destroyed menu items of old menu (which created in call of
g_list_foreach on line 15)?
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Re: GList empty after iteration?
Hello Craig,
I think this is because after first loop, variable "events" is NULL,
and you cant get first element of GList from it:
g_list_next() --- Returns : the next element, or NULL if there are no
more elements.
> Hi All,
>
> I am confused about GList. My application is parsing a file and creating
> midi data with it. I am using GList to store the midi data. I have
> created a GtkListStore to view the parsed data (to insure I am parsing
> the data properly). So, below I iterate through the GList and "copy"
> the data into a tree view. But, I am shocked to see that after I
> iterate through the GList, I cannot iterate through the list again. I
> have debugged the list after the iteration with g_list_length(events)
> which shows the list length at 0. What is up with this? The first
> while loop has data, the second while loop has not data. The code is
> below-->
>
> GtkTreeIter tree_iter;
> events = g_list_reverse(events);
> events = g_list_first(events);
> while(events)
> {
> gtk_list_store_append (list_store, &tree_iter);
> struct midi_event *me = events->data;
> gtk_list_store_set(list_store, &tree_iter,
> 0, me->time_stamp,
> 1, me->event_type,
> 2, me->message1,
> 3, me->message2,
> -1);
> events = g_list_next(events);
> }
> /// this is where the list appears to be empty
> events = g_list_first(events);
> while(events)
> {
> g_print("midi event \n");
> events = g_list_next(events);
> }
>
> Thanks for any help!
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