2011/9/12 Craig <craigbakal...@verizon.net>:
> 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);
shallowcopy = 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 = shallowcopy;
> while(events)
> {
> g_print("midi event \n");
> events = g_list_next(events);
> }
>
> Thanks for any help!
Your first loop ands when your event is zer0. Youn need to use a
second pointer for your second iteration which still points to the
first item in the actual list.
Hope that helps.
Regards
Bernhard
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