Win32API, CreateProcess and environment

ruby-talk
1

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

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ยทยทยท

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