Re: How to return a collection object

From:

"Alexander Nickolov" <agnickolov@mvps.org>

Newsgroups:

microsoft.public.platformsdk.com_ole,microsoft.public.vc.atl

Date:

Mon, 30 Jul 2007 11:13:25 -0700

Message-ID:

<uyZITVt0HHA.5380@TK2MSFTNGP04.phx.gbl>

Well, you instantiate the object and return it. See CComObject<>
and friends. If you need to always return the same object though,
have a look at FAQ article 12:

http://vcfaq.mvps.org/com/12.htm

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

"Brian Jones" <brian@aol.com> wrote in message
news:%23Wdz4tg0HHA.4928@TK2MSFTNGP03.phx.gbl...

I have a COM object called ILibrary. It has a property called OldBooks. I
want to return a collection of IBooks in this property. I have created a
collection object called IBooksEnum, which I want to return. I'm wondering
what is the syntax to copy the collection into an IDispatch**.

IDL for the OldBooks property:

[id(7), propget, helpstring("Retrieves a list of old books in the
library.")]
HRESULT OldBooks([out, retval] IDispatch** disp);Implementation:

STDMETHODIMP CLibrary::get_OldBooks(IDispatch** disp)
{
   // *******************************************************
   // what is the correct way to return an IBooksEnum object (via disp)
here?
   // ****************************************************

return S_OK;
}