From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Cecil Westerhof Newsgroups: gmane.emacs.help Subject: Re: Checking parameters Date: Sun, 17 Jun 2007 20:08:05 +0200 Message-ID: <46757885$0$337$e4fe514c@news.xs4all.nl> References: <46750a24$0$338$e4fe514c@news.xs4all.nl> <87sl8qsoqp.fsf@lion.rapttech.com.au> NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7Bit X-Trace: sea.gmane.org 1182105694 18399 80.91.229.12 (17 Jun 2007 18:41:34 GMT) X-Complaints-To: usenet@sea.gmane.org NNTP-Posting-Date: Sun, 17 Jun 2007 18:41:34 +0000 (UTC) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Sun Jun 17 20:41:33 2007 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 1Hzzgr-0003s2-6q for geh-help-gnu-emacs@m.gmane.org; Sun, 17 Jun 2007 20:41:33 +0200 Original-Received: from localhost ([127.0.0.1] helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1Hzzgq-0007fw-Kx for geh-help-gnu-emacs@m.gmane.org; Sun, 17 Jun 2007 14:41:32 -0400 Original-Path: shelby.stanford.edu!newsfeed.stanford.edu!syros.belnet.be!news.belnet.be!feeder.news-service.com!newsgate.cistron.nl!xs4all!transit1.news.xs4all.nl!post.news.xs4all.nl!not-for-mail Original-Newsgroups: gnu.emacs.help User-Agent: KNode/0.8.0 Original-Lines: 21 Original-NNTP-Posting-Host: 213.84.157.201 Original-X-Trace: 1182103686 news.xs4all.nl 337 [::ffff:213.84.157.201]:12073 Original-X-Complaints-To: abuse@xs4all.nl Original-Xref: shelby.stanford.edu gnu.emacs.help:149547 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:45136 Archived-At: Tim X wrote: >> I am new to Emacs and lisp. >> What is the best way to check parameters and do error handling when they >> are not correct? > > Emacs will throw an error if the function is called with the wrong number > of arguments. Okay, I do not have to take care of that. ;-} > However, if you want to get a bit more > adventurous and you would like a function that can tell the user the > arguement is invalid and give them another opportunity to enter a > correctly formatted argument, you might want to use a function instead of > the prompt sring. Not at the moment, I am just starting. Furthermore, the function shall mostly be used non-interactively. But thanks for the thought.