Re: What's system attribute "__CF_USER_TEXT_ENCODING"?
Re: What's system attribute "__CF_USER_TEXT_ENCODING"?
- Subject: Re: What's system attribute "__CF_USER_TEXT_ENCODING"?
- From: John Delacour <email@hidden>
- Date: Fri, 30 Aug 2002 00:41:45 +0100
At 6:25 am +0800 30/8/02, bill wrote:
PS : [OT] In the input menu of international preference panel, some keyboard
layout9s input menu are Roman, some Central European, while some exotic ones
are Unicode, what does it mean?
1.
Under the old order -- and may its death be speedy -- the maximum
number of different graphic 8-bit characters was (2^8) less 31
control characters, which makes about 225, enough for nearly any
European alphabetic script and far too many for Americans, but never
enough for all of them, hence a plethora of ISO and non-ISO
"character sets" special to particular languages and scripts. Why
2^8? Because that's the way computers are.
2.
Enter the Chinese, for whom even 13,000 characters is restricting,
and they, the Japanese and the Koreans (CJK) each have several
"two-byte" character sets, which allows them a maximum of about
13,600 different characters composed of two bytes.
3.
Unicode assigns two (at the moment mainly) bytes to every known glyph
under the sun and each glyph has a unique address in the table, so
that it is possible to write a document containing any number of
languages and signs without any declaration of character sets. This
is a Good Thing. The bad thing is that Apple have only just started
implementing it at system level when Windows NT did so ten (?) years
ago -- but they're doing a good job at last.
Read all about it at <
http://www.unicode.org/>. There's nothing new
about it except the sudden flurry of activity down Cupertino way.
JD
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