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From: mhamel_98@yahoo.com
Newsgroups: comp.lang.ada
Subject: Re: Concatenating files
Date: Sat, 22 Sep 2007 15:51:29 -0700
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Date: 2007-09-22T15:51:29-07:00
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Hi Jeff, I don't have any resources available in front of me, but I
always thought Direct_Io was essentially the same as Sequential_Io
save for the additional ability of retrieving, or reading, the "nth"
record without having to start from the beginning of the file.  Does
Direct_Io allow editing, or writing, of said "nth" record without
disrupting records written before or after?  Or, does Direct_Io allow
writing to the "nth" place? in which case I would start writing my
data starting at 2, for instance, then when complete, write the first,
or header record.

On Sep 22, 1:07 pm, "Jeffrey R. Carter"
<spam.jrcarter....@acm.nospam.org> wrote:
> mhamel...@yahoo.com wrote:
> > Thanks for the replies!  How about this, instantiating Sequential_Io
> > with a variant record?  The header data can be put into a record
> > easily enough, so I would write the first sequential record as a
> > header type with the following as the original data records.  The
> > problem is, some of the header data will not be known until all the
> > data records have been written.  Is there a way to edit, in place, the
> > first record of a sequential file?  Thanks much again c.l.a!
>
> Sounds as if Ada.Direct_IO would be better.
>
> --
> Jeff Carter
> "Ada has made you lazy and careless. You can write programs in C that
> are just as safe by the simple application of super-human diligence."
> E. Robert Tisdale
> 72