Re: COM_INTERFACE_ENTRY2 ?

From:
"Igor Tandetnik" <itandetnik@mvps.org>
Newsgroups:
microsoft.public.vc.atl
Date:
Thu, 26 Mar 2009 08:07:29 -0400
Message-ID:
<uzG1ytgrJHA.2368@TK2MSFTNGP06.phx.gbl>
"Goran" <goran.pusic@gmail.com> wrote in message
news:fc5a78f9-0768-4e57-9d52-ce3c4da192bc@e3g2000vbe.googlegroups.com

I am putting COM interface onto existing code. Let's say I have 3
classes, and that "3" contains data of type "1" and "2". I simply want
a similar "containment" structure in COM interface.

So I have the following quasi-idl that follows:

interface I1 : IDispatch {stuff here}
interface I2 : IDispatch {stuff here}

interface I3 : IDispatch
{
property I1 i1;
property I2 i2;
property T MyOwnProp;
}

Let's say that II1, II2 and II3 are corresponding implementations that
should wrap my data of type "1", "2" and "3".

So I came with the following use of only one implementation for all,
like this:

class II1 /*abstract*/: public IDispatchImpl<I1> {}
class II2 /*abstract*/ : public IDispatchImpl<I2> {}
class II3 : public II1, public II2, public IDispatchImpl<I3>


Why do you have II3 implement interfaces I1 and I2? I thought you wanted
II3 to have properties that return separate objects, one implementing I1
and another implementing I2. Why don't you just do that?

See also http://vcfaq.mvps.org/com/12.htm
--
With best wishes,
    Igor Tandetnik

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