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Re: OS_Find &4F

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In article <2b3b10af5c.jmb@jmc.bruck.orange.fr>,
   Jean-Michel <jmc.bruck@orange.fr> wrote:
> 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!)

I suspect the differences are more to do with the FileSystem being
used, rather than the RISC OS version. I have certainly seen
differences in what can be done to open files on different file
systems.

-- 
Martin Avison 
Note that unfortunately this email address will become invalid
without notice if (when) any spam is received. 

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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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