Date: 13 Aug 2003 10:34:20 +0200
Message-Id: <uvft2q7lf.fsf@elta.co.il>
From: Eli Zaretskii <eliz AT elta DOT co DOT il>
To: =?iso-8859-1?q?cyril=20cayla?= <cyrilcayla AT yahoo DOT fr>
CC: djgpp AT delorie DOT com
In-reply-to: <20030813072306.5893.qmail@web20802.mail.yahoo.com> (message from
	=?iso-8859-1?q?cyril=20cayla?= on Wed, 13 Aug 2003 09:23:06 +0200
	(CEST))
Subject: Re: little problem
References:  <20030813072306 DOT 5893 DOT qmail AT web20802 DOT mail DOT yahoo DOT com>
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[Please keep this discussion on the mailing list, so others could
chime in and help.]

> Date: Wed, 13 Aug 2003 09:23:06 +0200 (CEST)
> From: =?iso-8859-1?q?cyril=20cayla?= <cyrilcayla AT yahoo DOT fr>
> 
> I can run some C programs compiled by djgpp called by
> the function "system" in perl. My problem is then
> specific to the program i've created.

Yes.

> I have to find why this prog.exe run perfectly in DOS
> and not in from the Perl code. The answer might be in
> this question: is there any problem with variables
> with very long names in parameter?
> [...]
> the exact call is this:
> system("prog \"".$workdir.$tiflist[$i+1]."\"
> \"".$workdir.$tiflist[$i]."\"
> \"".$workdir.$preprocess[1]."\"
> \"".$workdir.$preprocess[2]."\"
> \"".$workdir.$datfile."\" $pr $spotsize
> $imageanalysistype $offsetadjust $controlimage
> \"".$workdir.$jpgfile."\" 2>\"".$workdir."im.res\"");

This is a very long command line.  When non-DJGPP programs invoke
DJGPP programs, they cannot pass commands longer than 126 characters
to them.  So to make this work, you need to use the response-file
method of passing long command lines to DJGPP programs.  That is,
change your Perl script to write the command-line arguments (what
follows "prog.exe" in your current script) to a file, and then invoke
your program like this:

     system("prog.exe @file 2>\"".$workdir."im.res\");

where `file' is the name of the file where you put the rest of the
command line.