Re: COM+ vs DCOM

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From: Alexander Nickolov (agnickolov_at_mvps.org)
Date: 11/04/04 

Date: Thu, 4 Nov 2004 13:56:54 -0800

Depends on the features you are using. COM+ is built on top of
COM and offers configured components with declarative setting
of a bunch of properties. It introduces a new apartment model
(the TNA - thread-neutral apartment) for COM objects, a new
concept of object contexts, eliminates direct caller to object
pointers by introducing interceptors (to adjust the context), a new
declarative role security model, and also offers COM+ services
(COM+ Events for example). I've never dealt with COM+
myself, so I'm not the best person to explain thing about COM+.
I suggest you read a book on the subject first, then ask specific
question on the appropriate group:
microsoft.public.platformsdk.complus_mts

As for the practical quesions:
- you can develop COM+ components with VC6, but the ATL
wizard does not support the TNA, so you'll need to manually
edit your RGS file for those components to specify Neutral
- you can only deploy COM+ components on Win2K and later
(excluding Win Me). Note that Win XP has a later version of
COM+ (1.5) with some new features I know nothing about.
- you can develop on any platform of course, you just can't
debug on a platform without COM+
- when developing COM+ components you usually follow
a specific design paradigm - stateless components. This is
especially necessary for transacted components. There are
other design principles, but you'll have to delve into COM+
yourself 

-- 
=====================================
Alexander Nickolov
Microsoft MVP [VC], MCSD
email: agnickolov@mvps.org
MVP VC FAQ: http://www.mvps.org/vcfaq
=====================================
"Jay" <jay@nowhere.com> wrote in message 
news:OMWRGarwEHA.3832@TK2MSFTNGP10.phx.gbl...
>I am new to COM+ development.
> What is the difference between the COM+ and DCOM?
> I read articles about how COM+ has additional services/features etc.
> But as a developer- How different is the code? Can I use visual studio 
> 6.0?
> Can I deploy the COM+ only to the win2k and above platforms? What are the
> other constraints?
> Can I develop them on NT with VC6.0?
>
> Thanks for your help!
>
>
>
>

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