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