Ruby win32ole - how to determine the OLE class type, whether the OLE class supports a method

Question

I am using Ruby 1.8. Using the WIN32OLE module -

1) How do I determine the class name of an OLE object instance? 2) How can I tell whether an object instance supports a particular method?

In an Outlook automation script, I am trying to delete the items in the 'Deleted Items' folder which are older than 21 days. For mail items, I want to use the ReceivedTime property, but in order to do that, I need to check whether the item is actually a MailItem instance.

For the second, the best I have been able to come up with is (really slow):

def MethodExists(obj, methodName)
  obj.ole_methods.each{|method|
    if (method.name == methodName)
      return true
    end
  }
  return false
end

score 7 · Accepted Answer · answered Feb 27 '09 at 18:49

7

With specific regard to WIN32OLE objects...

How do I determine the class name of an OLE object instance?

object.ole_obj_help.name

How can I tell whether an object instance supports a particular method?

object.ole_methods.collect!{ |x| x.to_s }.include?( 'MethodName' )

answered Feb 27 '09 at 18:49

David Mullet

446
2
4

1

I think object.ole_methods.any? { |x| x.to_s == "MethodName" } would be a bit more concise. Or #detect, that would be good too. – Mike Woodhouse Mar 01 '09 at 14:45
@MikeWoodhouse: The code came from [this link](http://rubyonwindows.blogspot.com/2009/02/win32ole-objects-class-names-and.html). I'd personally do `ole_methods.collect(&:to_s)` (ie no bang, and use Symbol#to_proc unless you're on Ruby 1.8.6). – Andrew Grimm Oct 27 '11 at 01:10

score -3 · Answer 2 · edited Nov 11 '11 at 21:52

-3

obj.class

:

if obj.respond_to?(methodName)
    #do your work
end

edited Nov 11 '11 at 21:52

chown

51,908
16
134
170

answered Feb 27 '09 at 15:59

aivarsak

279
1
6

Ruby win32ole - how to determine the OLE class type, whether the OLE class supports a method

2 Answers2