From: adam hegge <rahegge@...>
Date: 2010-07-23T05:02:20+09:00
Subject: Re: How to avoid black-windows using system() ?

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require 'win32/process'
Process.create({:app_name => cmd,  :startup_info=>
{:sw_flags=>Process::SW_HIDE , :startf_flags =>
Process::STARTF_USESHOWWINDOW}})

On Thu, Jul 22, 2010 at 3:37 PM, Roger Pack <rogerpack2005@gmail.com> wrote:

>
> > RC> I thought that when you call system() with only one parameter,
> > cmd.exe
> > RC> is used but when you call system() with more than one parameter, the
> > RC> program is directly launched without cmd.exe
> >
> > RC> Can you confirm that ?
>
>
> I think I know where the confusion lies.
> from [1] it reads
>
> " If exec is given a single argument, that argument is taken as a line
> that is subject to shell expansion before being executed. If multiple
> arguments are given, the second and subsequent arguments are passed as
> parameters to command with no shell expansion"
>
> The shell expansion it is referring to here is things like expanding
> paths, ex:
> system("ls $HOME") gets expanded to system("ls /home/username")
>
> however
>
> system("ls", "$HOME")
>
> does not get auto-expanded.
>
> They both require "sub-shell" in windows because the process you are
> executing (montage.exe) requires somewhere to output its data to, so it
> pops up.  It is possible to make a program "not require an output shell"
> but most programs aren't setup that way (rubyw.exe is, ruby.exe isn't,
> for example).
>
> Recommendation: use IO.popen("whatever").read to avoid popping it up.
> GL.
> -r
>
>
>
> [1] http://ruby-doc.org/core/classes/Kernel.html#M005968
>
> >
> > RC> thanks & regards.
> >
> > I'm not sure I follow you ...
> >
> > Have you tried the "back tick" processing to do what you want?
> >   `d:/mes documents/___3D/imageMagick/montage.exe`
>
> --
> Posted via http://www.ruby-forum.com/.
>
>

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