From: Tallak Tveide <tallak@...>
Date: 2010-01-23T00:13:09+09:00
Subject: Re: win32ole with COM method taking two out refs

Hi

I realize this is an old thread, but I am struggeling, I think, with the 
same issues. It occurs on a COM server that if freely available, namely 
Matrikon OPC Simulator 
(http://www.matrikonopc.com/products/opc-desktop-tools/index.aspx). I 
have attached the olegen file and also a script that fails in the same 
manner as described.

I'm failrly sure that this should be scriptable as a pure python library 
exists that does the same (OpenOPC)

What I did:

  ruby olegen.rb 'OPC Automation 2.0' > olegen_opc_automation.rb

My application:
  ...
  items =  Object.new # output
  errors =  Object.new # output
  group.OPCItems.AddItems 1, ['', 'Random.Int1'], [0, 1], items, errors
  ..

The olegen code for the method looks like this:

  # VOID AddItems
  # Adds OPCItem objects to the collection
  #   I4 arg0 --- NumItems [IN]
  #   BSTR arg1 --- ItemIDs [IN]
  #   I4 arg2 --- ClientHandles [IN]
  #   I4 arg3 --- ServerHandles [OUT]
  #   I4 arg4 --- Errors [OUT]
  #   VARIANT arg5 --- RequestedDataTypes [IN]
  #   VARIANT arg6 --- AccessPaths [IN]
  def AddItems(arg0, arg1, arg2, arg3, arg4, arg5=nil, arg6=nil)
    ret = _invoke(1610743820, [arg0, arg1, arg2, arg3, arg4, arg5, 
arg6], [VT_I4, VT_BYREF|VT_ARRAY|VT_BSTR, VT_BYREF|VT_ARRAY|VT_I4, 
VT_BYREF|VT_ARRAY|VT_I4, VT_BYREF|VT_ARRAY|VT_I4, VT_VARIANT, 
VT_VARIANT])
    @lastargs = WIN32OLE::ARGV
    ret
  end


OPC is widely used in the automation industry, and I would so much like 
to use ruby as a tool. The possibilities are endless, but OPC is a key 
enabler for this to happen. So - any help is REALLLY appreciated ;-)

Btw: I'm using

ruby 1.9.1p243 (2009-07-16 revision 24175) [i386-mingw32]

Attachments:
http://www.ruby-forum.com/attachment/4408/files.zip

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