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From: xxremak@csduts1.lerc.nasa.gov (David A. Remaklus)
Newsgroups: comp.lang.fortran
Subject: Re: VAX/VMS Fortran: Record length in BYTES
Message-ID: <1990Dec17.173038.6222@eagle.lerc.nasa.gov>
Date: 17 Dec 90 17:30:38 GMT
References: <5125.2767b5c5@cc.curtin.edu.au>
Reply-To: xxremak@csduts1.UUCP (David A. Remaklus)
Organization: NASA/Lewis Research Center, Cleveland
Lines: 26

In article <5125.2767b5c5@cc.curtin.edu.au> Gumley_LE@cc.curtin.edu.au (Liam Gumley) writes:
>Re: VAX/VMS Fortran
>
>I have to write a series of data buffers to a file, each of which is
>13730 bytes long.  Note that this is not a multiple of four.
>The file I am creating MUST have a record length of 13730 bytes, and
>MUST only contain the data in the buffer i.e. no record length markers
>or terminators etc. - it is essentially an image file.
>So I cannot use an 'unformatted' type file, as these must have record lengths
>which are multiples of longwords - 13730 won't work in VAX/VMS Fortran.
>I can use write statements on a 'formatted' file, but the use of code such as
>
  (stuff deleted)


If I read your description correctly, it sounds as though you are using
fixed length records (this assumes that you ALWAYS right the 13730 bytes).
I suggest you try using a fixed length direct access file.  I'm not
sure how VMS implements this but on all other systems that I have worked
with, this method results in fast I/O and the equivant of a byte stream
file (ie, no record headers and trailers).
--
David A. Remaklus		   Currently at: NASA Lewis Research Center
Amdahl Corporation				 MS 142-4
(216) 642-1044					 Cleveland, Ohio  44135
(216) 433-5119					 xxremak@csduts1.lerc.nasa.gov