Re: When To AddRef

From:

Alexander Mueller <millerax@hotmail.com>

Newsgroups:

microsoft.public.vc.atl

Date:

Fri, 16 Nov 2007 13:00:27 +0100

Message-ID:

<473d8659$0$27135$9b4e6d93@newsspool1.arcor-online.net>

Igor Tandetnik schrieb:

Alexander Mueller <millerax@hotmail.com> wrote:

Btw is there a COM-call or something else (macro,
smartpointer, an ATL-Wrapper) that does both in one, copy the pointer
and call AddRef? just to not forget to addref?

CComPtr automatically AddRef's on construction or assignment, and
Release's in destructor.

Hi

Thanks for the info.
How do I release/delete/remove from memory a pointer wrapped with CComPtr?
Simply NULL it?
Do I have to take care of relasing it at all?

MfG,
Alex

My code was :

  IWMWriter * _pAsfWriter;

  ...

  _pAsfWriter = pAsfWriterTmp
  _pAsfWriter->AddRef();

  ...
  SAFE_RELEASE(pAsfWriter);

  SAFE_REASE expands to:
  if(_pAsfWriter) {_pAsfWriter-Release();_pAsfWriter = NULL;}

Now it is:

  CComPtr<IWMWriter> _pAsfWriter;
  ...
  _pAsfWriter = pAsfWriterTmp;

  //doesn't work any longer for obvious reasns:
  //SAFE_RELEASE(pAsfWriter);

  //also fails, cause object wasn't new'ed
  //SAFE_DELETE(pAsfWriter);

  _pAsfWriter = NULL; //doesn't fail but is it crrect?