Re: Internal coding system - Need advice 22 v. 23

[Kenichi Handa <handa@m17n.org>]

In article <87pr7pzme8.fsf@gmx.de>, Sebastian Rose <sebastian_rose@gmx.de> writes:

> To send unicode text to emacs via org-protocol, I wrote a function, that
> decodes all those hex-encoded characters (e.g. `%C3%B6' is the German
> Umlaut `ü'). That function `org-protocol-unhex-string' is defunned in
> org/lisp/org-protocol.el. It works perfectly for emacs-23.

> For emacs-22 this does _not_ work, however.

> The problem occurs, if `char-to-string' is called with an unicode
> character. E.g.

>    (char-to-string 8211)

> perfectly returns a dash in emacs-23. `org-protocol-unhex-string' works
> like a charme for texts like those on http://www.welcome2japan.cn/ - in
> emacs-23.

Emacs-23's character code is a superset of Unicode, but
Emacs-22's character code is not compatible with Unicode.
To get Emacs-22's character code from Unicode character
code, you must use decode-char function.  For instance, the
above should be done by (string (decode-char 'ucs 8211)).

And please note that Emacs-22 supports just a subset of
Unicode (U+0000..U+33FF, U+E000..U+FFFF, and some of CJK
characters contained in such legacy charsets as JISX0208,
GB2312, KSC5601).

---
Kenichi Handa
handa@m17n.org