Re: G_LIST_REMOVE not working... at least not for me :-)

[Mike Dailey <daileyml yahoo com>]

Havoc,

Sorry for the second email, but I just ran into a
problem with the code you provided.  With a few small
adjustments, it popped nicely into my application.

However, when I remove the last item from the list,
the list becomes a NULL list, and I can not use
'gtk_combo_set_popdown_strings' to basically "clear"
the last item from the combo box.  I found out that
when you try to 'gtk_combo_set_popdown_strings' a NULL
glist, GTK throws an error and the contents of the
combo do not clear.

If the item you are removing from the combo box is the
last item in there, how do you remove that last item
and update the combo box to show it as "empty"?

Thanks again!

-Mike


--- Havoc Pennington <hp redhat com> wrote:
> On Sat, Nov 16, 2002 at 03:50:05PM -0800, Mike
> Dailey wrote:
> > mainConnMgmtComboList = g_list_remove
> > (mainConnMgmtComboList,
> > g_strdup(FMC->appCURMGMTHOST.c_str()));
>
> C doesn't work this way; it doesn't know what the
> void* in the 
> GSList points to. You have to remove the string
> using exactly the 
> same pointer used to add the string.
>
> GList*
> remove_string_by_value (GList *list, const char
> *str)
> {
>   GList *iter;
>   iter = list;
>   while (iter != NULL)
>     {                   
>       const char *s = iter->data;
>       if (strcmp (s, str) == 0)
>         return g_list_remove (list, iter->data);
>       iter = iter->next;
>     }
>   return list;
> }
>
> You can make it more efficient by unlinking the list
> node "iter" when
> the string matches, instead of using g_list_remove
> which scans from
> the front of the list, but it's somewhat more
> tricky.
>
> Havoc


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