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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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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