From: Robert Dober <robert.dober@...>
Date: 2006-04-07T22:42:20+09:00
Subject: Re: win32ole with COM method taking two out refs

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On 4/7/06, Adam Gardiner <adam.gardiner@bt.com> wrote:
>
> 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


WIN32OLE::VARIANT springs into mind, but I have no idea ;). RDoc can be
trusted though sometimes.

Cheers
Robert

--
> Posted via http://www.ruby-forum.com/.
>
>


--
Deux choses sont infinies : l'univers et la b=EAtise humaine ; en ce qui
concerne l'univers, je n'en ai pas acquis la certitude absolue.

- Albert Einstein

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