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From: STEINBERGER@KL.SRI.COM.UUCP
Newsgroups: comp.os.vms
Subject: Warning on fwrite C function
Message-ID: <12335430450.32.STEINBERGER@KL.SRI.Com>
Date: Thu, 17-Sep-87 18:23:15 EDT
Article-I.D.: KL.12335430450.32.STEINBERGER
Posted: Thu Sep 17 18:23:15 1987
Date-Received: Sat, 19-Sep-87 10:13:58 EDT
Sender: daemon@ucbvax.BERKELEY.EDU
Distribution: world
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In an earlier message I asked a question about reading/writing binary files
from VAX C.  After two calls to the DEC CSS, I have found that the description
of the arguments to fwrite is not appropriate if one is trying to write a
single binary record to a (fixed record size) file opened with the "wb"
attribute.  The VAX C RTL Ref Man states that the second and third arguments
to fwrite are number of items and size of item.  This may work for writing to
non-binary files.  To write one record, the second argument should be the
total size in bytes (and equal the record size used in the "mrs=rec_size"
argument of fopen), and the third argument should equal 1.
    The fread function works as advertised on binary files.

-Ric Steinberger
Steinberger@kl.sri.com

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