Ruby获取windows系统安装的所有软件

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 k["DisplayName"]    rescue "?"        puts k["DisplayVersion"] rescue "?"        puts k["Publisher"]      rescue "?"        puts k["URLInfoAbout"]   rescue "?"        puts    endend