Re: g_object_get_data changed data association

["Tristan Van Berkom" <tvb gnome org>]

Hi, Check that your list store is properly refcounted, is there any
reason why the list store may have been destroyed previous
to this call ?

Cheers,
                -Tristan


On Fri, Jul 25, 2008 at 10:41 AM, YU WU <wuyu_2001 hotmail com> wrote:
> dear sir or madam,
>
> i am developing applications with GTK+ and have some problem, following is some digest of my code.
>
> =====================================
>  store = gtk_list_store_new(NUMS_MAX_FORCE, G_TYPE_STRING, G_TYPE_STRING, G_TYPE_STRING, G_TYPE_STRING, 
> G_TYPE_STRING, G_TYPE_STRING, G_TYPE_STRING, G_TYPE_STRING);
>  g_object_set_data(G_OBJECT(window), "staad_max_force_store", store);
>  printf("## start store memory=%p\n", g_object_get_data(G_OBJECT(window), "staad_max_force_store"));
>  printf("## is store=%d\n", GTK_IS_LIST_STORE(store));
>  printf("## name store=%s\n", G_OBJECT_TYPE_NAME(store));
> =====================================
>
> i install a list store by above codes. then i want to update the list store somewhere later.
>
> =====================================
> /* for debug */
>  if(g_object_get_data(G_OBJECT(widget), "staad_max_force_store") == NULL)
>    printf("NULL\n");
>  else
>  {
>    printf("store memory=%p\n", g_object_get_data(G_OBJECT(widget), "staad_max_force_store"));
>    printf("## name store=%s\n", G_OBJECT_TYPE_NAME(g_object_get_data(G_OBJECT(widget), 
> "staad_max_force_store")));
>  }
>
>      while(curr_data)
>      {
>    i = 0;
>
>    curr_item = curr_data->content;
>    while(curr_item)
>    {
>      gtk_list_store_append(store, &iter);
>      if(++i == 1)
>      {
>        gtk_list_store_set(store, &iter, MAX_FORCE_MEM_NUM, (local1 = char_to_utf8 (curr_data->mem_num)), 
> MAX_FORCE_ITEM, (local2 = char_to_utf8 (curr_item->item)), MAX_FORCE_FX, (local3 = char_to_utf8 
> (curr_item->FX)), MAX_FORCE_FY, (local4 = char_to_utf8 (curr_item->FY)), MAX_FORCE_FZ, (local5 = 
> char_to_utf8 (curr_item->FZ)), MAX_FORCE_MX, (local6 = char_to_utf8 (curr_item->MX)), MAX_FORCE_MY, (local7 
> = char_to_utf8 (curr_item->MY)), MAX_FORCE_MZ, (local8 = char_to_utf8 (curr_item->MZ)), -1);
>        g_free(local8);
>      }
>      else
>        gtk_list_store_set(store, &iter, MAX_FORCE_ITEM, (local1 = char_to_utf8 (curr_item->item)), 
> MAX_FORCE_FX, (local2 = char_to_utf8 (curr_item->FX)), MAX_FORCE_FY, (local3 = char_to_utf8 
> (curr_item->FY)), MAX_FORCE_FZ, (local4 = char_to_utf8 (curr_item->FZ)), MAX_FORCE_MX, (local5 = 
> char_to_utf8 (curr_item->MX)), MAX_FORCE_MY, (local6 = char_to_utf8 (curr_item->MY)), MAX_FORCE_MZ, (local7 
> = char_to_utf8 (curr_item->MZ)), -1);
>      g_free(local1);
>      g_free(local2);
>      g_free(local3);
>      g_free(local4);
>      g_free(local5);
>      g_free(local6);
>      g_free(local7);
>
>      curr_item = curr_item->next;
>    }
>    curr_data = curr_data->next;
>      }
>
> =====================================
>
> after using "g_object_get_data(G_OBJECT(widget), "staad_max_force_store")", i hope to get the store i 
> defined at the beginning. but in fact i didn't get the list store, but something else -- instead of a list 
> store. of course, the store can't be updated.
>
> from my debug info, the data gotten from "g_object_get_data(G_OBJECT(widget), "staad_max_force_store")" has 
> the same memory address with that defined "g_object_set_data(G_OBJECT(window), "staad_max_force_store", 
> store);", but "G_OBJECT_TYPE_NAME(store)" changed.
>
> so, i would like to know if there is hint to be used for "g_object_get_data" and "g_object_set_data". what 
> could be the problem?
>
> p.s.: in my program, there is public area -- a gtkbox to be used by all sub-program. if i always run the 
> above sub-program, the problem mentioned above won't come up. but, if i run the above sub-program first, 
> then change to another sub-program, and later i come back to the above sub-program, the above problem comes 
> up. during this process, i used "gtk_widget_destroy" to destroy the widget of the first sub-program in the 
> public area and build the widget for the next coming sub-program. i am wondering if the 
> "gtk_widget_destroy" disturbs the data associations table.
>
> i think my question is a little confusing because i could not describe the question clearly enough. i do 
> hope you could read my words above and try to give me some suggestion. thanks a lot.
>
> looking forward to your reply.
>
> best regards,
>
> wu yu
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