From: "Berger, Daniel" <Daniel.Berger@...>
Date: 2006-05-01T22:09:19+09:00
Subject: Re: Win32API, CreateProcess and environment



> -----Original Message-----
> From: Park Heesob [mailto:phasis68@hotmail.com] 
> Sent: Saturday, April 29, 2006 8:07 PM
> To: ruby-talk ML
> Subject: Re: Win32API, CreateProcess and environment
> 
> 
> 
> Hi,
> 
> >From: Daniel Berger <djberg96@gmail.com>
> >Reply-To: ruby-talk@ruby-lang.org
> >To: ruby-talk@ruby-lang.org (ruby-talk ML)
> >Subject: Win32API, CreateProcess and environment
> >Date: Sun, 30 Apr 2006 02:13:06 +0900
> >
> >Hi all,
> >
> >Ruby 1.8.4
> >
> >I'm working on a pure Ruby Process.create method.  What I have below 
> >seems
> >to work, except that if I attempt to pass an environment 
> string, it causes 
> >the app to die instantly.  What am I doing wrong?
> >
> The 'notepad' process requires 'SystemRoot' environment 
> variable.

D'oh!

> And the environment block must be separated by "\0" 
> and end with "\0\0".
> 
> Here is modified code:
> 
> require 'Win32API'
> 
> 
> params = 'LPLLLLLLPP'
> 
> CreateProcess = Win32API.new('kernel32','CreateProcess', params, 'I')
> 
> def create(hash={})
>     env = 0
>     if hash['environment']
>        env = hash['environment'].split(File::PATH_SEPARATOR) << 
> "SystemRoot=#{ENV['SystemRoot']}" << "\0"
>        env = [env.join("\0")].pack('p*').unpack('L').first
> 
>     end
> 
>     startinfo = [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
>     startinfo = startinfo.pack('LLLLLLLLLLLLSSLLLL')
>     procinfo  = [0,0,0,0].pack('LLLL')
> 
> 
>     CreateProcess.call(
>        0, "notepad", 0, 0, 0, 0, env, 0, startinfo, procinfo
>     )
> 
>     return procinfo[8,4].unpack('L').first # pid
> end
> 
> p create() # ok
> p create('environment'=>"PATH=C:\\;LIB=C:\\lib")
> 
> Regards,
> 
> Park Heesob

Works great, thanks.

Dan


This communication is the property of Qwest and may contain confidential or
privileged information. Unauthorized use of this communication is strictly 
prohibited and may be unlawful.  If you have received this communication 
in error, please immediately notify the sender by reply e-mail and destroy 
all copies of the communication and any attachments.