Re: Error in gtk_text_buffer_insert()?

["Matthew Walker" <mwalker kydance net>]

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())