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From: Gumley_LE@cc.curtin.edu.au (Liam Gumley)
Newsgroups: comp.lang.fortran
Subject: VAX/VMS Fortran: Record length in BYTES
Message-ID: <5125.2767b5c5@cc.curtin.edu.au>
Date: 13 Dec 90 09:09:24 GMT
Organization: Curtin University of Technology
Lines: 28

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

	byte buffer(13730)
	write(disk,10) buffer
10	format(13730a1)

appears to slow down the write statement considerably.  I have tried various
hacks with internal writes, different file formats, but I always end up with
something which is darned slow at writing.

Can I do anything to speed up the writes to a 'formatted' file?
Why doesn't VAX/VMS Fortran let you specify the record lengths in BYTES?

Cheers,
Liam.

-- 
#Liam E. Gumley, Department of Applied Physics, Curtin University of Technology#
#Perth, Western Australia.   >>>All opinions expressed are exclusively mine.<<<#