From: gregarican <greg.kujawa@...>
Date: 2005-09-28T03:21:44+09:00
Subject: Re: Outlook calendar

Whether you are working with Contact, Calendar, Tasks, etc. MAPI
objects the Ruby code is the same. Here's an example that will give you
the MAPI CDOPR_ENTRYID values for all calendar entries. In this case
it's a Vacation Calendar out in the Public Folders:

require 'win32ole'

CDOPR_ENTRYID = 0x0FFF0102 # the MAPI property ID for Entry ID's

# create the Exchange server session
  @session = WIN32OLE.new('Mapi.Session')
  @session.logon('Greg Kujawa')

# navigate to the Sales Contacts entry underneath All Public Folders
  publicFolders = String.new
  recordCount = @session.InfoStores.count
  recordCount.times { |i|
    publicFolders = @session.InfoStores.Item(i+1).RootFolder.Folders if
@session.InfoStores.Item(i+1).name == "Public Folders"
  }
  allPublicFolders = String.new
  recordCount = publicFolders.count
  recordCount.times { |i|
   allPublicFolders = publicFolders.Item(i+1).Folders if
publicFolders.Item(i+1).name == "All Public Folders"
  }
  vacationCalendar = String.new
  recordCount = allPublicFolders.count
  recordCount.times { |i|
    vacationCalendar = allPublicFolders.Item(i+1).messages if
allPublicFolders.Item(i+1).name == "Vacation Calendar"
  }

  recordCount = vacationCalendar.count
  recordCount.times { |i|
    p vacationCalendar.Item(i+1).Fields.Item(CDOPR_ENTRYID).value.to_s
  }

For a listing off all of the MAPI property ID's check out
http://www.cdolive.com/cdo10.htm. You will have to translate the VB
some, as the &H0FFF0102 means 0x0FFF0102 or '0FFF0102'.hex. The trick
(as I have mentioned) when pulling data is that any nil/null field
values cause MAPI to return an error code. So you have to write a Ruby
routine that will catch this error and simply return a nil/null field
value instead of raising a runtime error. Does this help?