From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: waterloo Newsgroups: gmane.emacs.help Subject: About character and Control character. Date: Wed, 5 Aug 2009 17:17:04 +0800 Message-ID: <907065090908050217h25b5b2f9o7359560c43ae5223@mail.gmail.com> NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary=00221532c7a46798ea0470617724 X-Trace: ger.gmane.org 1249463876 19215 80.91.229.12 (5 Aug 2009 09:17:56 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 5 Aug 2009 09:17:56 +0000 (UTC) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Wed Aug 05 11:17:49 2009 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by lo.gmane.org with esmtp (Exim 4.50) id 1MYcd0-0000Ex-J3 for geh-help-gnu-emacs@m.gmane.org; Wed, 05 Aug 2009 11:17:47 +0200 Original-Received: from localhost ([127.0.0.1]:40132 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1MYccz-0003wA-HR for geh-help-gnu-emacs@m.gmane.org; Wed, 05 Aug 2009 05:17:45 -0400 Original-Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1MYccQ-0003w5-DO for help-gnu-emacs@gnu.org; Wed, 05 Aug 2009 05:17:10 -0400 Original-Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1MYccL-0003vt-Jq for help-gnu-emacs@gnu.org; Wed, 05 Aug 2009 05:17:09 -0400 Original-Received: from [199.232.76.173] (port=53675 helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1MYccL-0003vq-Bt for help-gnu-emacs@gnu.org; Wed, 05 Aug 2009 05:17:05 -0400 Original-Received: from mail-yw0-f184.google.com ([209.85.211.184]:60536) by monty-python.gnu.org with esmtp (Exim 4.60) (envelope-from ) id 1MYccL-0001gb-3p for help-gnu-emacs@gnu.org; Wed, 05 Aug 2009 05:17:05 -0400 Original-Received: by ywh14 with SMTP id 14so6031445ywh.1 for ; Wed, 05 Aug 2009 02:17:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:date:message-id:subject :from:to:content-type; bh=eTYX14QcgL75NCv5RgzqVcys0/ksCTj7pOnF5iaMf78=; b=Hedw4PGaeJAEDVyMmMK/R5wnkB71w9tO2OcZB7VjsskR74ANZjSflWpiYfDEuQya+u t9GkvyXUOLRjsBKC+E2MFRysAjpGL396C8E3rcZhlBRMEZdIl7A3lVa8yIy8peo9GSsk GMOf1E1nMoEhqhuOAwEOTbF2XdFipT4YYCAVY= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:date:message-id:subject:from:to:content-type; b=Y05sADzLpw5Q55JeqlIFCb9Bx0CJMynVS/hERtDQWrbZQ+Z5WKhk0mKotqvQEqy5Rk 6bRuNN8sEf8TQ0EI6o61YCd50qc8fTB2WBw+15rZGQdujKbVmpmBLtcJEix9z+Eow17E tOJCeNJj4YzOZE49v84/F4E1215RcG1Aq1Iy0= Original-Received: by 10.231.14.4 with SMTP id e4mr2631691iba.33.1249463824258; Wed, 05 Aug 2009 02:17:04 -0700 (PDT) X-detected-operating-system: by monty-python.gnu.org: GNU/Linux 2.6 (newer, 2) X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.help:66768 Archived-At: --00221532c7a46798ea0470617724 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit I am reading Emacs Lisp Reference and can not understand the following paragraph: For historical reasons, Emacs treats the character as the control equivalent of `?': ?\^? => 127 ?\C-? => 127 As a result, it is currently not possible to represent the character `Control-?', which is a meaningful input character under X, using `\C-'. It is not easy to change this, as various Lisp files refer to in this way. What I understand is : ?\^? = now we can not represent `Control-?' with `?\ " syntax. Is it right? What does "which is a meaningful input character under X, using `\C-'. " mean ? Thanks --00221532c7a46798ea0470617724 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable I am reading Emacs Lisp Reference and can not understand the following para= graph:

For historical reasons, Emacs treats the <DEL> characte= r as the
control equivalent of `?':

=A0=A0=A0=A0 ?\^? =3D>= 127=A0=A0=A0=A0 ?\C-? =3D> 127

As a result, it is currently not possible to represent the character`Control-?', which is a meaningful input character under X, using
`= \C-'.=A0 It is not easy to change this, as various Lisp files refer to<= br> <DEL> in this way.

What I understand is :=A0
?\^? =3D <= DEL>
now we can not represent `Control-?' with `?\ " syntax.=

Is it right?

What does "which is a meaningful input cha= racter under X, using
`\C-'. " mean ?

Thanks

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