Re: Using the VB/VBA Collection class in C++ code

From:
"Alexander Nickolov" <agnickolov@mvps.org>
Newsgroups:
microsoft.public.vc.atl
Date:
Tue, 22 Aug 2006 10:07:11 -0700
Message-ID:
<uHoUp1gxGHA.4192@TK2MSFTNGP06.phx.gbl>
Ah, you simply accept IDispatch* as the property type.
My explanation was how you use the collection, accepting
it is trivial...

--
=====================================
Alexander Nickolov
Microsoft MVP [VC], MCSD
email: agnickolov@mvps.org
MVP VC FAQ: http://www.mvps.org/vcfaq
=====================================

"Rob Perkins" <finitedev@community.nospam> wrote in message
news:4l0rd7Fe42iqU1@individual.net...

Alexander Nickolov wrote:

You need to call IDispatch::Invoke with DISPID_NEWENUM (-4)
and you get a VARIANT with VT_UNKNOWN as a result.
QI that IUnknown pointer for IEnumVARIANT and off
you go...

_NewEnum (the usual name for the hidden DISPID_NEWENUM
property) is a read-only property defined on all collection
objects.


That doesn't make much sense to me, in terms of typing my interface's
property so that VB6 agrees to send it VBA.Collection objects. From that
point I suppose I could just call the Item() and Count() methods and
enumerate manually.

Unless you're recommending that I type the property as IUnknown, and pass
the collection in "As Object", followed by what you're recommending?

Rob

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