Re: How do I propogate error information from FinalConstruct?

From:

"Alexander Nickolov" <agnickolov@mvps.org>

Newsgroups:

microsoft.public.vc.atl

Date:

Thu, 12 Jul 2007 16:42:34 -0700

Message-ID:

<uEx5S5NxHHA.4076@TK2MSFTNGP02.phx.gbl>

Failure return value from FinalConstruct becomes the return value
of IClassFactory::CreateInstance (propagated to you through
CoCreateInstance[Ex]) and class objects naturally don't support
rich error information.

As Brian already said, you should return specific HRESULTs
of your choosing. Though I'd advise against using custom
HRESULTs since IClassFactory is a standard interface, not
one you define yourself.

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

<news.nospam.cechner@gmail.com> wrote in message
news:1184264141.983982.19090@57g2000hsv.googlegroups.com...

Hi,

I have a COM object that can fail during the FinalConstruct, but Id
like to propogate a bit more information out to the (C#) host than
just an error code.

It seems I cant use the CreateErrorInfo/SetErrorInfo at this stage,
presumably because the object wasnt fully constructed and
InterfaceSupportsErrorInfo never gets called.

Whats the typical mechanism for sending arbitrary errors out of an ATL
object constructor?

Thanks in advance,

--
Paul