Re: Do I need to call Release on smart pointer

"jean" <>
31 May 2006 11:00:12 -0700

I have the following question. Thanks.
1. How do I figure out if a Microsoft SDK function return AddRef'd
pointers, e.g GetHtmlDocument()?
2. What's the consequence if I don't call Release? Is it memory leak? I
have the following code using GetHtmlDocument(), but I didn't use
Release, the program runs fine.
    IHTMLDocument2 *document;
    LPDISPATCH lpDispatch = GetHtmlDocument();
    //get html document from IDispatch
    LRESULT hr=lpDispatch->QueryInterface(IID_IHTMLDocument2, (void**)

    WriteToDocument( document, xmlStr );


Jeff Partch [MVP] wrote:

"Igor Tandetnik" <> wrote in message

With apologies and hesitation... Doesn't it depend on whether the
OtherFunc1 and/or OtherFunc2 AddRef the interface pointers they

Well, I assumed OtherFunc1 and OtherFunc2 are correctly written. They
should return either a non-AddRef'ed raw pointer, or a smart pointer.

More apologies, but the reason I asked is that I routinely encounter wizard
generated wrappers which are keen to expose methods like: LPDISPATCH
GetHtmlDocument() -- that do return AddRef'd pointers, so in a function

VOID CSomeClass::SomeFunc(VOID)
    ISmartPointer p = m_someWrapper.GetSomeDispatch();
} can expect the ref count to go up, up and up.

Jeff Partch [VC++ MVP]

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