Query Win Registry

some.rb

require 'win32/registry'

  Win32::Registry::HKEY_LOCAL_MACHINE.open('Software\Microsoft\Windows\CurrentVersion\Uninstall') do |reg|
    reg.each_key do |key1,key2|
      k = reg.open(key1)
#      puts key1
#      puts k["DisplayName"]    rescue "?"
#      puts k["DisplayVersion"] rescue "?"
#      puts k["Publisher"]      rescue "?"
#      puts k["URLInfoAbout"]   rescue "?"
#      puts

      app = Hash.new()
      app[:displayname] = k["DisplayName"]   	rescue "?"
      app[:displayversion] = k["DisplayVersion"] 	rescue "?"
      app[:publisher] = k["Publisher"]			rescue "?"
      app[:urlinfoabout] = k["URLInfoAbout"]		rescue "?"

      installed_application[key1.to_sym] = app

    end
  end