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Groups > comp.sys.acorn.programmer > #503

Re: Task Obey madness

From Rob Davison <nospamthanks@invalid.invalid>
Newsgroups comp.sys.acorn.programmer
Subject Re: Task Obey madness
Date 2011-07-05 19:59 +1200
Organization A noiseless patient Spider
Message-ID <iuugf2$u4e$1@dont-email.me> (permalink)
References <6353b0ed51.martin@blueyonder.co.uk> <mpro.lntvzt002odox02pg.vinceh@softrock.co.uk> <51ede3e23cUCEbin@tiscali.co.uk>

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On 7/5/2011 6:07 PM, John Williams (News) wrote:

> Only close a file if the handle is not zero, and when you do, set the
> handle to zero.  Make it a habit!
>
> Do the same particularly in your error routine.

I'll third the above advice. Always prefix any attempt to close
a file handle with a check to ensure it is non-zero.

In error handlers something along the lines of...

IF handle%<>0 THEN htemp%=handle%:handle%=0:CLOSE#htemp%

...is better than:

IF handle%<>0 THEN CLOSE#handle%:handle%=0


Rob.
-- 
Maple Glen  http://www.mapleglen.co.nz/
Photos      http://www.pbase.com/mapleglen/

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Thread

Task Obey madness Martin Bazley <martin.bazley@blueyonder.co.uk> - 2011-07-04 21:44 +0100
  Re: Task Obey madness Vince M Hudd <vinceh@softrock.co.uk> - 2011-07-04 22:35 +0100
    Re: Task Obey madness "John Williams (News)" <UCEbin@tiscali.co.uk> - 2011-07-05 08:07 +0200
      Re: Task Obey madness Rob Davison <nospamthanks@invalid.invalid> - 2011-07-05 19:59 +1200
        Re: Task Obey madness Paul Sprangers <Paul@sprie.nl> - 2011-07-05 10:28 +0200
          Re: Task Obey madness "John Williams (News)" <UCEbin@tiscali.co.uk> - 2011-07-05 12:08 +0200
          Re: Task Obey madness Vince M Hudd <vinceh@softrock.co.uk> - 2011-07-05 11:36 +0100
            Re: Task Obey madness Paul Sprangers <Paul@sprie.nl> - 2011-07-05 12:43 +0200
              Re: Task Obey madness "John Williams (News)" <UCEbin@tiscali.co.uk> - 2011-07-05 12:51 +0200
                Re: Task Obey madness Ian Hamilton <Ian.Hamilton@AAUG.net> - 2011-07-05 12:03 +0100
                Re: Task Obey madness "John Williams (News)" <UCEbin@tiscali.co.uk> - 2011-07-05 13:32 +0200
                Re: Task Obey madness Vince M Hudd <vinceh@softrock.co.uk> - 2011-07-05 12:57 +0100
                Re: Task Obey madness "John Williams (News)" <UCEbin@tiscali.co.uk> - 2011-07-05 14:17 +0200
                Re: Task Obey madness Paul Sprangers <Paul@sprie.nl> - 2011-07-05 14:39 +0200
              Re: Task Obey madness Vince M Hudd <vinceh@softrock.co.uk> - 2011-07-05 12:22 +0100
          Re: Task Obey madness Rob Davison <nospamthanks@invalid.invalid> - 2011-07-06 08:27 +1200
          Re: Task Obey madness Rick Murray <heyrickmail-usenet@yahoo.co.uk> - 2011-07-06 08:15 +0200
            Re: Task Obey madness jgharston <jgh@arcade.demon.co.uk> - 2011-07-06 18:48 -0700
              Re: Task Obey madness "Ste (news)" <steve@revi11.plus.com> - 2011-07-07 13:55 +0100
              Re: Task Obey madness Rick Murray <heyrickmail-usenet@yahoo.co.uk> - 2011-07-12 20:07 +0200
      Re: Task Obey madness cferris@freeRemoveuk.com.invalid - 2011-07-05 09:09 +0100
        Re: Task Obey madness Steve Drain <steve@kappa.me.uk> - 2011-07-05 10:19 +0100
    Re: Task Obey madness Martin Bazley <martin.bazley@blueyonder.co.uk> - 2011-07-05 12:40 +0100
      Re: Task Obey madness Martin <News03@avisoft.f9.co.uk> - 2011-07-05 16:19 +0100
        Re: Task Obey madness Alan Adams <alan@adamshome.org.uk> - 2011-07-05 17:31 +0100
          Re: Task Obey madness Ian J Hartley <Ian.Hartley@sky.com> - 2011-07-06 12:35 +0100
            Re: Task Obey madness "Ste (news)" <steve@revi11.plus.com> - 2011-07-07 13:57 +0100
              Re: Task Obey madness Alan Adams <alan@adamshome.org.uk> - 2011-07-07 21:18 +0100
              Re: Task Obey madness Ian J Hartley <Ian.Hartley@sky.com> - 2011-07-13 12:36 +0100
                Re: Task Obey madness "Ste (news)" <steve@revi11.plus.com> - 2011-07-14 15:58 +0100
                Re: Task Obey madness Ian Hamilton <Ian.Hamilton@AAUG.net> - 2011-07-14 16:10 +0100
                Re: Task Obey madness Ian J Hartley <Ian.Hartley@sky.com> - 2011-07-17 12:30 +0100
                Re: Task Obey madness "Ste (news)" <steve@revi11.plus.com> - 2011-07-17 14:23 +0100
                Re: Task Obey madness Ian J Hartley <Ian.Hartley@sky.com> - 2011-07-17 16:14 +0100
                Re: Task Obey madness druck <news@druck.org.uk> - 2011-07-14 19:23 +0100
                Re: Task Obey madness Ian J Hartley <Ian.Hartley@sky.com> - 2011-07-17 14:17 +0100
  Re: Task Obey madness Jeremy Nicoll - news posts <jn.nntp.scrap007@wingsandbeaks.org.uk> - 2011-07-05 22:15 +0100
    Re: Task Obey madness Rainer Schubert <dl6hbo@dl6hbo.inka.de> - 2011-07-08 17:14 +0200

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