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Groups > comp.sys.apple2.programmer > #3812

Re: Basic does not clear file on open

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On 2017-08-13 18:49, gids.rs@sasktel.net wrote:
> On Sunday, August 13, 2017 at 3:53:17 AM UTC-6, Brian Patrie wrote:
>> On 2017-08-12 10:00, ewerst wrote:
>>> The VERIFY will succeed but the DELETE will cause the ONERR to trigger.
>>
>> This is one of the reasons that i prefer the OPEN,DELETE,OPEN method; it
>> will err for more relevant reasons--including a type mismatch.  I also
>> just plain hate trapping errors; AppleSoft's error trap plumbing is
>> clumsy, even before having to deal with its bugs.  (Would RESUME NEXT
>> have been too much to ask for?)
>>
>> On that note, it would be really sweet if there was a mode (perhaps
>> invoked by a special prefix to a DOS command) wherein errors, instead of
>> stopping the programme, would just set the error code.  Then error
>> trapping could be almost as easy as it is in unixoid shell scripts.
>>
>> e.g.
>>
>> 42 PRINT D$ ".OPEN" F$ : IF PEEK(222)>0 THEN PRINT "Unable to open " F$
>> : END
> 
> The ONERR GOTO should work with DOS as well.  There is a list of DOS error codes on the Beagle Peeks and Pokes chart.

Of course.  The idea behind this fantasy is to avoid having to use ONERR 
GOTO, because it's messy and buggy.  Of course, if i'm indulging in 
fantasy, i could have RESUME NEXT (go to the command AFTER the error 
occurred, instead of the command that caused it--which is tricky to make 
useful).

But anyway, my fantasies are a digression.  :)

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Thread

Basic does not clear file on open Bill Chatfield <billchatfield1@gmail.com> - 2017-08-11 07:58 -0700
  Re: Basic does not clear file on open Michael J. Mahon <mjmahon@aol.com> - 2017-08-11 11:33 -0500
    Re: Basic does not clear file on open Bill Chatfield <billchatfield1@gmail.com> - 2017-08-11 10:50 -0700
  Re: Basic does not clear file on open James Davis <JPD.Enterprises@outlook.com> - 2017-08-11 09:38 -0700
  Re: Basic does not clear file on open gids.rs@sasktel.net - 2017-08-11 13:38 -0700
    Re: Basic does not clear file on open Bill Chatfield <billchatfield1@gmail.com> - 2017-08-11 14:01 -0700
      Re: Basic does not clear file on open gids.rs@sasktel.net - 2017-08-11 23:41 -0700
        Re: Basic does not clear file on open gids.rs@sasktel.net - 2017-08-11 23:51 -0700
    Re: Basic does not clear file on open Michael J. Mahon <mjmahon@aol.com> - 2017-08-11 18:57 -0500
    Re: Basic does not clear file on open ewerst@msn.com - 2017-08-12 07:54 -0700
      Re: Basic does not clear file on open ewerst@msn.com - 2017-08-12 08:00 -0700
        Re: Basic does not clear file on open gids.rs@sasktel.net - 2017-08-12 12:29 -0700
          Re: Basic does not clear file on open ewerst@msn.com - 2017-08-13 09:11 -0700
            Re: Basic does not clear file on open Michael J. Mahon <mjmahon@aol.com> - 2017-08-13 13:40 -0500
            Re: Basic does not clear file on open gids.rs@sasktel.net - 2017-08-13 16:41 -0700
              Re: Basic does not clear file on open gids.rs@sasktel.net - 2017-08-13 16:58 -0700
              Re: Basic does not clear file on open ewerst@msn.com - 2017-08-13 19:08 -0700
                Re: Basic does not clear file on open gids.rs@sasktel.net - 2017-08-14 07:46 -0700
        Re: Basic does not clear file on open Brian Patrie <bpatrie@bellsouth.spamisicky.net> - 2017-08-13 04:53 -0500
          Re: Basic does not clear file on open John Brooks <jbrooks@blueshiftinc.com> - 2017-08-13 14:30 -0700
            Re: Basic does not clear file on open Brian Patrie <bpatrie@bellsouth.spamisicky.net> - 2017-08-14 18:33 -0500
          Re: Basic does not clear file on open gids.rs@sasktel.net - 2017-08-13 16:49 -0700
            Re: Basic does not clear file on open Brian Patrie <bpatrie@bellsouth.spamisicky.net> - 2017-08-14 18:43 -0500
              Re: Basic does not clear file on open Bill Chatfield <billchatfield1@gmail.com> - 2017-08-15 06:13 -0700
                Re: Basic does not clear file on open gids.rs@sasktel.net - 2017-08-15 13:22 -0700
                Re: Basic does not clear file on open Bill Chatfield <billchatfield1@gmail.com> - 2017-08-15 13:26 -0700
                Re: Basic does not clear file on open Antoine Vignau <antoine.vignau@laposte.net> - 2017-08-15 13:48 -0700
                Re: Basic does not clear file on open Bill Chatfield <billchatfield1@gmail.com> - 2017-08-16 06:08 -0700

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