Re: In COM Addref() and Release() function is called implicitly or exp

"Alexander Nickolov" <>
Thu, 8 Mar 2007 12:33:55 -0800
Additionally, clients usually use smart pointer classes
in order to automate reference counting and avoid nasty
reference count leak errors. For example ATL offers
CComPtr<> and CComQIPtr<> for that purpose.

Alexander Nickolov
Microsoft MVP [VC], MCSD

"Bruno van Dooren [MVP VC++]" <> wrote
in message

Hi Guys, can u please tell me in COM Addref() and Release() function
is called automatically or called by user explicitly. please tell me
what is the exact solution.

Normally, AddRef is called by the creator of an interface pointer.
then you get the interface pointer, and as soon as you are done with it,
call Release.

for example: if you use CoCreateInstanceEx to create a new object and
request an interface, the object will call AddReff in its QueryInterface
method before returning the interface pointer to you.
You do something, and then you call Release.

As soon as the refcount of that object drops to 0, it is free to

Kind regards,
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