Ruby, Outlook and yield

How to get unread messages from outlook in Ruby.

require 'Outlook'

outlook = Outlook.new

#GET UNREAD MESSAGES FROM OUTLOOK
outlook.viewMessages(){|msg|
 puts msg
}

require 'win32ole'
require 'date'
require "KeyStorage"

#Class MailItem value Object
class MailItem

 def initialize(subj, to, from, cc, body, path, msgid, unread, created)
   @subj = subj
   @to = to
   @from = from
   @cc = cc
   @body = body
   @path = path
   @msgid  = msgid
   @unread = unread
   @created = created
   #p msgid.length
 end

 attr_reader :subj, :to, :from, :cc, :body, :path, :msgid, :unread, :created

 def eql?(o)
   o.is_a?(MailItem) && msgid == o.msgid
 end

 def hash
   @msgid.hash
 end

 def to_s
   return "MailItem: @subj:" + @subj + "\n @to" + @to + "\n @cc " + @cc  + "\n" + @msgid
 end
end


class Outlook

 OLFolderInbox = 6
 OLMailItem = 43
 OLAppointmentItem = 53

 def initialize()
   @ol = WIN32OLE.new("Outlook.Application")
   puts "Get MAPI"
   olookNameSpace = @ol.GetNameSpace("MAPI")
   puts "Get default Inbox folder"
   @loInbox = olookNameSpace.GetDefaultFolder(OLFolderInbox)
   @unusedFolderPath = @loInbox.folderPath
 end

 def message2Item(loMailItem, folder)
   case loMailItem.Class
   when OLMailItem
     MailItem.new(loMailItem.subject, loMailItem.to, loMailItem.senderName, loMailItem.cc, loMailItem.htmlBody, folder, loMailItem.entryID, loMailItem.UnRead, loMailItem.creationTime)
   when OLAppointmentItem
     #p "AppointmentItem found: [" + loMailItem.subject + "]"
     MailItem.new(loMailItem.subject, "Appointment::", loMailItem.senderName, "", loMailItem.body, folder, loMailItem.entryID, loMailItem.UnRead, loMailItem.creationTime)
   else
     p "UnknownItem found: [" + loMailItem.subject + "]"
   end
 rescue Exception => e:
   puts "Exception in message2Item: " + e
 end

 def processFolderWithSubs(folder, readAll)
   fp = folder.folderPath.gsub(@unusedFolderPath, "").gsub("\\", "/")
   #p "->" + fp
   for loMailItem in folder.Items
     if loMailItem.UnRead || readAll
       messageItem = message2Item(loMailItem, fp)
       if messageItem != nil
         #call block with message
         yield messageItem
       end
     end
   end
   #check subfolders
   for loFolder in folder.Folders
     processFolderWithSubs(loFolder, readAll){|m| yield m}
   end
 end

 def viewMessages(readAll = false)
   processFolderWithSubs(@loInbox, readAll){|m| yield m}
 end

end