Re: Non-creatable classes

From:
"Alexander Nickolov" <agnickolov@mvps.org>
Newsgroups:
microsoft.public.vc.atl
Date:
Tue, 30 Jan 2007 10:09:38 -0800
Message-ID:
<uI4cPnJRHHA.912@TK2MSFTNGP06.phx.gbl>
Actually, it's essential for VB programmers if the object
has an outgoing interface (events in VB lingo). E.g. the
coclass has a [default, source] (disp)interface.

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

"Igor Tandetnik" <itandetnik@mvps.org> wrote in message
news:%23ZXy9SIRHHA.1228@TK2MSFTNGP06.phx.gbl...

Ignacio Burgue?o <blabla@blabla.com> wrote:

I have a com server which returns new instances of class A. I don't
want A to be createable. Only when requesting it to my server. So,
following the article on private hierarchies, I removed its .rgs
file, deleted its OBJECT_ENTRY and DECLARE_REGISTRY_RESOURCEID. So
far, so good. My question is: what's the difference between leaving the
definition
of the coclass A in the IDL and marking it as [noncreatable], and
removing the definition from the IDL, and not inheriting from
CComCoClass ?


Not much. Some languages, most notably VB, can use coclass name as a
synonym for its default interface when they see coclass statement in the
TLB. VB programmers like this, for some reason.

It also can be viewed as a means of documentation.
--
With best wishes,
   Igor Tandetnik

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