From: Gordon Thiesfeld <gthiesfeld@...>
Date: 2006-08-16T02:11:26+09:00
Subject: Re: Setting Windows Environment Variables

You can use WMI via win32ole:


require 'win32ole'

def append_to_system_path(path)
  wmi = WIN32OLE.connect("winmgmts:\\\\.\\root\\cimv2")
  wql = "Select * from Win32_Environment Where Name = 'PATH' and UserName = '<SYSTEM>'"
  system_path = wmi.ExecQuery(wql)

  system_path.each do |i|
    i.VariableValue += ";#{path}"
    i.Put_
  end

end

def create_environment_variable(var_name, value)
  wmi = WIN32OLE.connect("winmgmts:\\\\.\\root\\cimv2")
  env_var = wmi.Get('Win32_Environment').SpawnInstance_
    
  env_var.Name = var_name
  env_var.UserName = "<SYSTEM>"
  env_var.VariableValue = value
  env_var.Put_
end
  

path = "C:\\something_you_want_appended"
append_to_system_path(path)


var_name = 'test'
value = 'SOME_VALUE'

create_environment_variable(var_name, value)