From: Adam Gardiner <adam.gardiner@...>
Date: 2006-04-07T21:16:46+09:00
Subject: win32ole with COM method taking two out refs

Hi,

I've got a challenge with a COM API that has a method with the 
signature:

   OpenApplication arg0, arg1, arg2, arg3, arg4
where
   arg0, arg1, arg2 are String IN paramters (VT_BSTR)
   arg3, arg4 are Variant OUT parameters (VT_BYREF|VT_VARIANT)

Arg3 and Arg4 are both objects returned by OpenApplication - in 
particular, arg3 is a HsxServer object for getting (mostly useless) info 
about the server, and arg4 is a HsvSession object needed for any useful 
work.

I know I need to retrieve the values of arg3 and arg4 after the call to 
OpenApplication using WIN32OLE::ARGV - the problem I have is: What do I 
pass as placeholders for arg3 and arg4 so that the call will succeed, 
and win32ole will know the types on return?

I've tried passing nil, which leads to a Type mismatch error.
I've tried passing Object.new, which allows the method to succeed and 
returns WIN32OLE objects in ARGV[3] and ARGV[4]. However, these objects 
have no associated type library information, so I then receive 
"undefined method" errors if I try to call any methods on them.

In VB, the example code defines variables for arg3 and arg4 that are of 
types defined in the type library (HsxServer and HsvSession), i.e.

    Dim session as HsvSession
    Dim server as HsxServer

Is there any way to achieve the same thing in Ruby with win32ole?

Many thanks,

Adam

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