From: Jano Svitok <jan.svitok@...>
Date: 2008-06-20T21:34:38+09:00
Subject: Re: Two Ruby equivalents to Powershell commands...

On Fri, Jun 20, 2008 at 14:21, Nicholas Calvert <nick.calvert@gmail.com> wrote:
> Cheers Gordon, you are a life saver. Whilst im on the same subject, i am
> also having trouble creating a new GUID. With Powershell i can do:
>
> $NEWGUID = [GUID]::NewGUID().ToString()
>
> Do you think its possible to do this with Ruby and ruby-wmi?

This is how I create GUIDs (requires win32utils gem, might not be
tested - I'm reinstalling ruby right now):

require 'windows/com'
require 'windows/unicode'

class String
  # Return the portion of the string up to the first NULL character.  This
  # was added for both speed and convenience.
  def nstrip
    self[ /^[^\0]*/ ]
  end
end

class Guid

  BUFFER_SIZE = 100

  attr_reader :data

  def initialize(data = nil)
    @data = data
    create if data.nil?
  end

  def create
    @data = 0.chr * 16
    raise 'GUID Error' unless CoCreateGuid(@data)
  end

  def to_s
    ret = 0.chr * BUFFER_SIZE
    i = StringFromGUID2(@data, ret, BUFFER_SIZE)
    wide_to_multi(ret[0..i*2]).nstrip
  end

private

  include Windows::COM
  include Windows::Unicode

end

if File.expand_path(__FILE__) == File.expand_path($0)
  puts Guid.new.to_s
end