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Re: OS_Find &4F

From Jean-Michel <jmc.bruck@orange.fr>
Newsgroups comp.sys.acorn.programmer
Subject Re: OS_Find &4F
Date 2026-02-22 10:17 +0100
Organization Jean-Michel
Message-ID <2b3b10af5c.jmb@jmc.bruck.orange.fr> (permalink)
References <b171d8ae5c.Paul@phorefaux>

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In message <b171d8ae5c.Paul@phorefaux>
          Paul Stewart <phorefaux@gmail.com> wrote:

> Hi there,

> Trying to read a log file when the file is already open by the the utility
> that is create it.(downloading a file using WGet and reading the log file
> to display percentage downloaded)

> Using SYS "XOS_Find",&4F,file$ TO handle%

> Now the above works fine on my RO4.42 and RO5 devices.

> When I test with VRPC with RO4 and RO6, Error is generated: Handle is
> either illegal or has been closed and errors with the line number the
> above SYS command is on.

> I'm doing
> OS_Find command to open the file
> getting the size
> OS_GBPB to read into buffer
> OS_Find to then close the file.

> Above all works fine on 4.42 and 5, but generates the Handle is either
> illegal or has been closed error on RO4 and RO6.

> Any ideas as to why the RO4 and RO6 do not like SYS "XOS_Find",&4F,file$
> TO handle% with a file that is already open and being updated, where as
> other OS's are fine with it?

Not sure, but osfind must have evolved
According to OSLib's SHelp manual, there are 32bit handles, the old ones 
were 8bit. from version 6.3 the handles are 32 bits. I don't know how to 
distinguish with Sys "OSfind" on Ro4  ?

You can display handle% for comparison. (Reporter is fine!)
-- 
Jean-Michel

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Thread

OS_Find &4F Paul Stewart <phorefaux@gmail.com> - 2026-02-21 23:08 +0000
  Re: OS_Find &4F Jean-Michel <jmc.bruck@orange.fr> - 2026-02-22 10:17 +0100
    Re: OS_Find &4F Martin <News04@avisoft.f9.co.uk> - 2026-02-22 10:14 +0000
      Re: OS_Find &4F Steve Fryatt <news@stevefryatt.org.uk> - 2026-02-22 16:33 +0000
      Re: OS_Find &4F Paul Stewart <phorefaux@gmail.com> - 2026-02-22 17:17 +0000
        Re: OS_Find &4F Harriet Bazley <harriet@bazleyfamily.co.uk> - 2026-02-22 21:17 +0000
          Re: OS_Find &4F Paul Stewart <phorefaux@gmail.com> - 2026-02-23 21:02 +0000
            Re: OS_Find &4F Steve Fryatt <news@stevefryatt.org.uk> - 2026-02-23 21:43 +0000
              Re: OS_Find &4F Paul Stewart <phorefaux@gmail.com> - 2026-03-11 10:26 +0000
        Re: OS_Find &4F Steve Fryatt <news@stevefryatt.org.uk> - 2026-02-22 22:54 +0000
          Re: OS_Find &4F Paul Stewart <phorefaux@gmail.com> - 2026-03-11 10:25 +0000

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