Re: Suspected memory leak in ATLCOM.h in CComCreator::CreateInstan

From:

"Igor Tandetnik" <itandetnik@mvps.org>

Newsgroups:

microsoft.public.vc.atl

Date:

Mon, 6 Nov 2006 11:28:42 -0500

Message-ID:

<Od4egCcAHHA.3316@TK2MSFTNGP02.phx.gbl>

technoway <technoway@community.nospam> wrote:

But, I am referring to p, not the returned interface.

Returned interface is normally just the base class of the object pointed
to by p.

1. Pointer ppv is set by QueryInterface. Does that contain the same
value as 'p'?

Usually, it contains the pointer to one of its base classes. So yes, it
refers to the same object, but may be at a small offset from p.

2. I am running BoundsChecker, and I am seeing 'p' leaked after the
program exits, but I am also seeing all instances of the object
Released by our own tracking code.

Either BoundsChecker or your tracking code are wrong.

3. Could this be due to 'slicing', which occurs due to multiple
inheritance? I know if you cast an object which uses mutliple
inheritance to one of the base classes, the pointer value can change
(See Effective C++ by Scott Meyers).

Yes it may. QueryInterface should take care of that.
--
With best wishes,
Igor Tandetnik

With sufficient thrust, pigs fly just fine. However, this is not
necessarily a good idea. It is hard to be sure where they are going to
land, and it could be dangerous sitting under them as they fly
overhead. -- RFC 1925