From: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: need info
Date: Fri, 14 Apr 2000 19:54:18 +0200
Organization: NetVision Israel	
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To: djgpp AT delorie DOT com
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Dieter Buerssner wrote:
> 
> Hans-Bernhard Broeker wrote:
> 
> >Only 1) is really on-topic in this newsgroup, I think. The answer in a
> >nutshell could be as simple as 'write them to the stdprn stream'.
> 
> Or fopen the printer device in binary mode.

The predefined stream stdprn is already open in binary mode.  See the file
src/libc/dos/io/dosio.c in the library sources.

> Something like
> 
> #define PRINTER_DEVICE "prn:"
> 
> FILE *fpprn = fopen(PRINTER_DEVICE, "wb");

This won't work: the DOS device name is "PRN", without the colon.  (The colon
in the end might work from COMMAND.COM because it treats the colon as a
separator character and doesn't pass it to DOS.  But it won't work from a
program.)

> may be easier to port.

Why is it easier to port?  All DOS/Windows environments support stdprn
because the printer is always open on handle 4 when the program starts.

> Also, the availability of stdprn in DJGPP
> depends on compiler flags. (IIRC, it won't work with -ansi.)

Nope, stdprn is always available.  You can see in stdio.h that its
declaration is before the "#ifdef __STRICT_ANSI__" part, which begins the
part that's invisible to the compiler under -ansi.