UTF-8 conversion

Hi list,

I'm trying to recode strings from UTF-8 to ISO-8859-1 charset, with this
little piece of code:

  {
    Octstr *body =
octstr_create("foo=100%25+des+%E9l%E9ments+%3D+%22%E7%22");
    Octstr *body_final = NULL;

    debug("test", 0, "body: %s", octstr_get_cstr(body));
    debug("test", 0, "octstr_recode rc = %d",
octstr_recode(octstr_imm("iso-8859-1"), octstr_imm("utf-8"), body));
    debug("test", 0, "body: %s", octstr_get_cstr(body));

    debug("test", 0, "charset_from_utf8 rc = %d",
charset_from_utf8(body, &body_final, octstr_imm("iso-8859-1")));
    debug("test", 0, "body_final: %s", octstr_get_cstr(body_final));

    debug("test", 0, "charset_convert rc = %d", charset_convert(body,
"utf-8", "iso-8859-1"));
    debug("test", 0, "body: %s", octstr_get_cstr(body));
  }

But that doesn't look right.
The return-codes of octstr_recode, charset_from_utf8 and charset_convert
are 0 (means everything is right), but the string is not modified at
all...

Does anyboby can tell me what's wrong in my code ???

Thanxs in advance...
Christophe