On Fri, Aug 31, 2012 at 12:56 PM, Gary Dumer <gedumer@xxxxxxxxx> wrote: > Hi, > > I'm having a problem that may be the result of my inexperience with GLib or > it could be an issue with Glib on Windows XP. > > I'm having several problems. The first is with g_list_index always returning > 0. Am I correct that g_list_index searches the entire list starting at 0 to > find the requested "data" OR does g_list_index start at the current position > to find the data? If it's the former then I'm having a problem, if it's the > latter then I assume that I have to set the starting position myself before > initiating g_list_index. > > If I'm positioned at the last element in the list and do this: > > g_list_index(x, "something") > > it returns 0 even though "something" exists in the list. However, if I do > this instead: > > g_list_index(g_list_first(x, "something"), "something") > > it works. In this case I'm obviously setting the position of the list to the > correct position before requesting the index... which seems redundant to me. > I'm confused. g_list_index requires that you pass the head list node. > The second issue is with g_list_nth_prev. The docs suggest that if I try to > move beyond the beginning of the list, g_list_nth_prev will return NULL and > the list will remain at the position prior to the invalid g_list_nth_prev. > For example, if I have a list containing 10 elements and I'm positioned at > the last element, if I do the following: > > if (NULL == (x = g_list_nth_prev(x, 99))) > print an error message... > else > proceed... > > the program crashes. But if I do this: > > if (NULL == g_list_nth_prev(x, 99)) > print an error message... > else > x = g_list_nth_prev(x, 9); > > it works correctly. The question is... should it work in the first case? My > understanding of the docs suggest it should. The first example should work. Can you give a more complete, runnable example that exhibits the crash? > The third issue relates to the second one. Any GList function that can > potentially advance the list beyond its boundaries is open to the same issue > above. So any of the following functions can end with the same potential > results: > > g_list_nth > g_list_nth_data > g_list_next > g_list_previous > > Maybe others as well. > > That's about it. Thanks for any help you can offer. > > Gary > > _______________________________________________ > gtk-list mailing list > gtk-list@xxxxxxxxx > https://mail.gnome.org/mailman/listinfo/gtk-list > -- Jasper _______________________________________________ gtk-list mailing list gtk-list@xxxxxxxxx https://mail.gnome.org/mailman/listinfo/gtk-list
