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From:	"Robbie Hatley" <loneXwolfintj AT pacXbell DOT net DOT remove DOT Xs>
Newsgroups:	comp.os.msdos.djgpp
References:	<4017ddaa$1_6 AT Newsfeeds DOT com> <uad47l1b0 DOT fsf AT elta DOT co DOT il>
Subject:	Re: How do I feed output of DOS commands into a program?
Date:	Mon, 2 Feb 2004 05:16:34 -0800
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"Eli Zaretskii" <eliz AT elta DOT co DOT il> wrote in message news:uad47l1b0 DOT fsf AT elta DOT co DOT il...
> > From: "Nathan Kreiger" <nathankreiger AT hotmail DOT com>
> > Newsgroups: comp.os.msdos.djgpp
> > Date: Wed, 28 Jan 2004 08:06:18 -0800
> >
> > I ran PROG1 and set the variable to "One, two, three, test.",
> > but when PROG2 trys to read the variable, it's already gone.
> > (Garbage collection at work?)
>
> This happens because the environment variables set by PROG1 are gone
> when PROG1 exits (they live in a block of memory that is allocated
> for PROG1 and deallocated when PROG1 exits).
>
> > Is there a way to set environmental variables so that they stay put
> > even when the program that set them terminates?
>
> The only portable way to do it is with a batch file.

Hmmm...  how about a non-portable way?  Even that might be
useful.

Batch files only seem to work for setting environmental variables if not
invoked  from within a program.  Otherwise, you end up with the same
thing: variables gone after program exits:

(program runs...)
int main(void)
{
   system("MyFancyBatchFile.bat"); // set TEST=ASDF
   return 0;
}
(...program exits)

Then type "set" at DOS prompt, and oops, the variable TEST
does not exist.  :-(

Surely there's got to be a way around that dilemma.


-- 
Cheers,
Robbie Hatley
Tustin, CA, USA
loneXwolfintj AT pacXbell DOT net DOT remove DOT Xs
http://home.pacbell.net/earnur/




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