Re: Error in gtk_text_buffer_insert()?

["Matthew Walker" <mwalker kydance net>]

I made a little progress on this today. Here's my new network_read().

When I run the app now, it doesn't segfault, but I get this output:

(panache:14915): Gtk-CRITICAL **: file gtktextbuffer.c: line 2469
(gtk_text_buffer_get_end_iter): assertion `iter != NULL' failed

(panache:14915): Gtk-CRITICAL **: file gtktextbuffer.c: line 508
(gtk_text_buffer_insert): assertion `iter != NULL' failed

How do I go about setting up the iter properly?

gint network_read ( gpointer data,
                    gint source,
                    GdkInputCondition condition)
{
  gchar buff[1025];
  int read_bytes = 1024;
  int got_bytes;
  gint local_data = GPOINTER_TO_INT(data);

  gtk_text_buffer_get_end_iter(
    gtk_text_view_get_buffer(
      GTK_TEXT_VIEW(WorldList[(int)local_data].output_text)
    ),
    WorldList[(int)local_data].output_end_iter
  );

  got_bytes = recv(source, buff, read_bytes, 0);

  if (got_bytes > 0) {
    gtk_text_buffer_insert(
      gtk_text_view_get_buffer(
        GTK_TEXT_VIEW(WorldList[(int)local_data].output_text)
      ),
      WorldList[(int)local_data].output_end_iter,
      _(buff),
      (gint)got_bytes
    );
    return TRUE;
  } else {
    gdk_input_remove(WorldList[(int)local_data].network_read_handler);
    return FALSE;
  }
}

Matthew Walker said:
> Allin Cottrell said:
> > On Sun, 28 Jul 2002, Matthew Walker wrote:
> >
> > > I'm working on converting a project from GTK 1.2 to 2.0, and I'm
> > > running into a segfault while using gtk_text_buffer_insert(). I've
> > > included the function where the segfault is occuring. If you need more
> > > information, let me know.
> > >
> > > (If you see any other problems, feel free to point them out too...)
> > >
> > > This is a read handler on a network socket.
> > >
> > > gint network_read ( gpointer data,
> > >                     gint source,
> > >                     GdkInputCondition condition)
> > > {
> > >   gchar buff[1025];
> > >   int read_bytes = 1024;
> > >   int got_bytes;
> > >
> > >   GtkTextView *output_view = (GtkTextView
> > > *)WorldList[(int)data].output_text; GtkTextBuffer *output_buffer =
> > > gtk_text_view_get_buffer(output_view);
> > > gtk_text_buffer_get_end_iter(output_buffer,
> > >                                WorldList[(int)data].output_end_iter);
> >
> > Couple of thoughts:
> >
> > Can you really do that (int) cast on "data"?  Perhaps you need
> > GINT_TO_POINTER() in the caller and GPOINTER_TO_INT() in
> > network_read()?
>
> I've never had to do it before, but I will add that in, since it sounds
> like a Good Idea (tm).
>
> > What is the type of WorldList[].output_end_iter?  From the context it
> > has to be pointer-to-GtkTextIter, and storage for the Iter must have
> > been allocated somehow.
>
> Here's the relevant bit of code that defines WorldList:
>
> struct WorldData {
>       GtkWidget *io_pane;
>       GtkWidget *output_scroller;
>       GtkWidget *output_text;
>       GtkWidget *input_scroller;
>       GtkWidget *input_text;
>       GtkWidget *world_name;
>       GtkWidget *editor_name;
>
>       GString *DisplayName;
>       GString *FileName;
>       GString *WorldDomain;
>       gint WorldPort;
>       GString *CharacterName;
>       GString *Password;
>       gint AutoConnect;
>       GString *WorldComment;
>       GList *command_history;
>       gint historyindex;
>       GString *storedcommand;
>       gboolean changed;
>       gint WorldType;
>       int sockfd;
>       struct sockaddr_in my_addr;
>       gint network_read_handler;
>       GtkTextIter *output_end_iter;
> };
> struct WorldData WorldList[32];
>
> (A pointer to a /good/ How-To on dynamically allocating memory for this
> kind of array would be VERY much appreciated. I don't wont to do it
> staticaly, but I can't grok malloc())
>
>
> _______________________________________________
> gtk-app-devel-list mailing list
> gtk-app-devel-list gnome org
> http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list