Searching a gtk text view

[Neil Munro <neilmunro gmail com>]

Hi all
        I am trying to search a text view and I think I understand the
theory but I can't seem to get my code working in practice. What I
have come to understand is that I create a textmark object and try to
search for the presence of the text mark in the buffer, if it's found
then create an iter at the position of the text mark. From there
search the document for the presence of the search string, if it is
found and the text mark can't be found in the document create the text
mark and highlight the search string.

My program seg faults with the following error:
(X2:32030): Gtk-WARNING **: Invalid text buffer iterator: either the
iterator is uninitialized, or the characters/pixbufs/widgets in the
buffer have been modified since the iterator was created.
You must use marks, character numbers, or line numbers to preserve a
position across buffer modifications.
You can apply tags and insert marks without invalidating your iterators,
but any mutation that affects 'indexable' buffer contents (contents
that can be referred to by character offset)
will invalidate all outstanding iterators

If someone could help me I would be very appreciative.
Neil Munro


static void Search( GtkWidget *widget, struct node *tmp )
{
        gchar *search;
        search = gtk_entry_get_text( GTK_ENTRY( tmp->Search1 ) );
        gboolean found;
        GtkTextMark *last_pos;
        GtkTextIter start, end;
        
        last_pos = gtk_text_buffer_get_mark( GTK_TEXT_BUFFER( tmp->Buffer ),
"last_pos" );

        if( last_pos )
                gtk_text_buffer_get_iter_at_mark( GTK_TEXT_BUFFER( tmp->Buffer ),
&tmp->iter, last_pos );
        
        found = gtk_text_iter_forward_search( &tmp->iter, search, 0, &start,
&end, NULL );

        if( found )
        {       
                if( last_pos == NULL )
                        gtk_text_buffer_create_mark( GTK_TEXT_BUFFER( tmp->Buffer ),
"last_pos", &end, FALSE );

                gtk_text_buffer_select_range( GTK_TEXT_BUFFER( tmp->Buffer ),
&tmp->iter, &end );
        }
}