Re: Getting crazy with GtkCTree widget

[José Carlos García Sogo <jsogo arrakis es>]

Wolfgang Sourdeau wrote:
> La plume légère, à Tue, Sep 26, 2000 at 05:16:35PM +0200, heure d'inpiration,
> José Carlos García Sogo écrivait en ces mots:
> >   This function returns me the node ok. Then I want, for example, get
> > the data stored in first column of the row. So I call this other
> > function:
> > gchar *
> > keymanager_get_username_from_node (GtkCTreeNode* node)
> > {
> >    gchar **data;
> >
> >    if (node != NULL)
> >       gtk_ctree_get_node_info (GTK_CTREE(keylist), node, data,
> > NULL,NULL,NULL,NULL,NULL,NULL,NULL);
> >
> >    return data[0];
> > }
>
> You should probably modify that function to make it look
> like this:
>
> gchar *
> keymanager_get_username_from_node (GtkCTreeNode* node)
> {
>         gchar *data;
>
>         if (node != NULL)
>                 gtk_ctree_get_node_info (GTK_CTREE(keylist), node, &data,
>                                 NULL,NULL,NULL,NULL,NULL,NULL,NULL);
>
>         return data;
> }
>
> gchar **data is a pointer to a pointer with an underfined value.
> So when you call gtk_ctree_get_node_info with it as an arg,
> gtk_ctree_get_node_info will modify the pointer pointed by "data", that is,
> at an undefined location in mem.
>
> OTHO, gchar *data is just a simple pointer. When you pass "&data" as an argument,
> gtk_ctree_get_node_info will modify the value of "data" and
> not the value of an undefined address. This, because not only "&data" is "known"
> but "data" too whereas in you version only "data" (equiv. to "&data") is known.

  Well this works and doesn't work. I mean: I have changed this and it
hasn't run, but when I have changed the order of the calls in the other
function I sent you, it has worked. I have put this funtion call first
and the others under this, and it seems to work properly.

  Another thing. I have passed **data because this is the type of arg
that comes in proto of gtk_ctree_get_node_info and because this function
should return not only first column but all of the columns of the node
(created with gtk_ctree_insert_node). I'm still thinking that something
is broken in this widget :-|

  Well, Million Thanks for your help! :)

--------------
José Carlos García Sogo
 jsogo arrakis es