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From: sbanner1@uvicctr.UUCP
Newsgroups: comp.sys.ibm.pc
Subject: Re: Need help with MS-DOS 3.1 and C
Message-ID: <227@uvicctr.UUCP>
Date: Sat, 14-Feb-87 21:09:47 EST
Article-I.D.: uvicctr.227
Posted: Sat Feb 14 21:09:47 1987
Date-Received: Sun, 15-Feb-87 16:03:47 EST
References: <784@cald80.UUCP> <174200030@uxc.cso.uiuc.edu>
Reply-To: sbanner1@uvicctr.UUCP (S. John Banner)
Organization: University of Victoria, Victoria B.C. Canada
Lines: 40

In article <174200030@uxc.cso.uiuc.edu> crimmins@uxc.cso.uiuc.edu writes:
>
>/* Written 11:38 am  Feb  5, 1987 by bob@cald80.UUCP in uxc.cso.uiuc.edu:comp.sys.ibm.pc */
>>In article <3281@hplabs.hplabs.UUCP> drichard@hplabs.UUCP (Dave Richards) writes:
>>>
>>>putc()ing characters to a stream that was successfully opened via
>>>fopen() for "w" access to "COM1".  I check the returned pointer for NULL
>>>and guaranteed fopen()s success.  However, after writing BUFSIZ
>>>...much deleted for Pnews
>>>	Dave Richards at Hewlett-Packard Labs (drichard@hplabs)
>>
>>I have found that fopen()ing a file causes the system to assume that
>>you are going to send text to it.  It usually turns on ^Z mapping to
>>end of file.  It also does \n to \r\n mapping.  Needless to say, you
>>can't pump binary to it.
>
>I'm not sure about aztec or desmet, but most of the C compilers I've
>used (including MSC) give you the option of opening the file in
>binary mode by appending a b to the mode (i.e. fopen("file","wb");).
>
>>Try to use open() on COM1 and see if that has any better success.
>
>With MSC, there are 5 predefined stream pointers...stdin, stdout,
>stderr, stdaux (COM1:), and stdprn (LPT1:).  No opening is
>necessary...just write to the appropriate stream.  This is all
>documented completely in the manuals.

Yes, but what if you want to read binary from stdin, and write
binary to stdout???

                      S. John Banner

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