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Date:	Thu, 14 Oct 2004 13:16:59 -0400 (EDT)
From:	Igor Pechtchanski <pechtcha AT cs DOT nyu DOT edu>
Reply-To:	cygwin AT cygwin DOT com
To:	"Gary R. Van Sickle" <g DOT r DOT vansickle AT worldnet DOT att DOT net>
cc:	cygwin AT cygwin DOT com
Subject:	RE: non-interactive cygwin setup
In-Reply-To:	<6290c469f12b7d558c1abb45766f7253@NO-ID-FOUND.mhonarc.org>
Message-ID:	<Pine.GSO.4.61.0410141314440.24756@slinky.cs.nyu.edu>
References:	<6290c469f12b7d558c1abb45766f7253 AT NO-ID-FOUND DOT mhonarc DOT org>
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On Thu, 14 Oct 2004, Gary R. Van Sickle wrote:

> [snip]
> > >I thought if a GUI app called printf it generally caused a console to
> > >be opened for it.  Maybe that's only with msvcrt.  In any case, the
> > >fact is that it is being run from a cmdline and so it certainly can
> > >communicate with the console.  The presence of command-line options
> > >in argc/argv could be taken as a fairly strong hint that it was being
> > >run from a shell rather than an icon.  And there's always "isatty
> > >(1)" if you really really want to be sure.
> >
> > This is a windows limitation.  GUI apps (apps created with
> > -mwindows) can't send output to or receive input from the
> > console.  Of course, a GUI can interpret command line
> > information.  It just cannot send output to the console that
> > started it.
> >
> > You could use AllocConsole to create a separate console which
> > the GUI could then use, however.
>
> Here's a maybe-less-icky way to do it.  Have two exes, one "setup.exe" which
> is a 100% command-line program that normally just spawns "winsetup.exe", the
> current GUI setup, and goes away.  Give it "--help", and it prints help in
> the regular command-line way and exits.  Yeah, two exes, but worse tragedies
> have happened.

Well, running the command-line program will pop up a console window if
it's not running from a console already.  How's that different from just
using AllocConsole in the GUI version?  In fact, isn't this what MSVCRT
does under the covers anyway?
	Igor
-- 
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     |,4-  ) )-,_. ,\ (  `'-'		Igor Pechtchanski, Ph.D.
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