Re: GtkTextBuffer: Q: offsets to indicies?

[Gustavo Carneiro <gjc inescporto pt>]

On Qui, 2002-08-01 at 17:41, Janus N. Tøndering wrote:
> On Thu, 2002-08-01 at 18:28, Gustavo Carneiro wrote:
> >   This is what you want:
> >
> > gtk_text_buffer_get_iter_at_offset(GtkTextBuffer *buffer,
> >                                    GtkTextIter *iter,
> >                                    gint char_offset);
>
> No, this is what I am using now. I do not have the char_offset - I have
> the byte index. The text below (from the GTK+ API ref.) explains it:

  You can use g_utf8_pointer_to_offset() to convert a byte index to
character offset. Example:
        gchar *str="some utf-8 string";
        int offset=g_utf8_pointer_to_offset(str, str+byte_index);

  Of course, in your case 'str' would be obtained from the text buffer
instead.
  Hope this helps.

> "One of the important things to remember about text in GTK+ is that it's
> in the UTF-8 encoding. This means that one character can be encoded as
> multiple bytes. Character counts are usually referred to as offsets,
> while byte counts are called indexes. If you confuse these two, things
> will work fine with ASCII, but as soon as your buffer contains multibyte
> characters, bad things will happen."
>
> Regards,
> Janus N. Tøndering
-- 
Gustavo João Alves Marques Carneiro
<gjc inescporto pt> <gustavo users sourceforge net>