Re: Default Implementation for IUnknown

From:
Stefan Weber <stefan.weber@gmail.com>
Newsgroups:
microsoft.public.vc.atl
Date:
8 May 2007 07:14:49 -0700
Message-ID:
<1178633689.626418.272730@u30g2000hsc.googlegroups.com>

Yes you can. Something like this:


No


What do you mean, no? Have you tried my code, and found it lacking? What
specifically seems to be the problem?


I'm sorry, I was about to type "now" but somehow forgot the "w".
Anyway, you were right that I was mixing your solutions with
Alexander's somehow. Now, I'm sticking to yours as well and have the
folloing event sink:

class ATL_NO_VTABLE DOMEventHandler :
    public IDispEventImpl<1, DOMEventHandler, &DIID_HTMLElementEvents2,
&LIBID_MSHTML, 1, 1> {

    typedef IDispEventImpl<1, DOMEventHandler, &DIID_HTMLElementEvents2,
&LIBID_MSHTML, 1, 1> BaseClass;

protected:
    long m_dwRef;

public:

    DOMEventHandler(void) {}
    virtual ~DOMEventHandler(void) {}

    void STDMETHODCALLTYPE OnClick(IHTMLEventObj *pEvtObj);

    BEGIN_SINK_MAP(DOMEventHandler)
        SINK_ENTRY_EX(1, DIID_HTMLElementEvents2,
DISPID_HTMLELEMENTEVENTS2_ONCLICK, OnClick)
    END_SINK_MAP()

    IDispatch* GetIDispatch() {
        return
            reinterpret_cast<IDispatch*>(static_cast<BaseClass*>(this));
    }

};

Then I tried to attach the sink to an HTML element:

    VARIANT v;
    CComPtr<IHTMLElement> spElement; // assume we have for example a div
element attached here
    DOMEventHandler* pDEH = new DOMEventHandler();
    v.vt = VT_DISPATCH;
    v.pdispVal = pDEH->GetIDispatch();
    hr = spElement->put_onclick(v); // ***
    CHECK_OK(hr);

Unfortunately, this is not working, I get a read access violation at
the line marked with ***. Do you have an idea what the problem could
be here?

Thanks a lot for your help!

Cheers,

Stefan

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