Trying to handle events from HTMLElementEvents...

From:

=?Utf-8?B?QWxl?= <Ale@discussions.microsoft.com>

Newsgroups:

microsoft.public.vc.mfc

Date:

Wed, 26 Jul 2006 18:52:02 -0700

Message-ID:

<C3657EF5-0B66-419A-BDD1-923C741C5FE1@microsoft.com>

Hi all,
I'm having problem in handling the ONCLICK event from HTMLElementEvents

I've connect the interface to my Sink object- code follow - but when
accessing to ElementObject I got an access violation...

To catch the event I've derived a class from CCmdTarget:

class CEventSink : public CCmdTarget
{
public:
    void OnClick( IHTMLEventObj *pEvtObj );

    DECLARE_DISPATCH_MAP()
};

in cpp:

// For HTML Events
BEGIN_DISPATCH_MAP(CEventSink, CCmdTarget)
    DISP_FUNCTION_ID(CEventSink, "OnClick", DISPID_HTMLELEMENTEVENTS2_ONCLICK,
OnClick, VT_EMPTY, VTS_VARIANT )
END_DISPATCH_MAP()
// END HTML Events

void CEventSink::OnClick(IHTMLEventObj *pEvtObj)
{
    AfxMessageBox( _T("ONCLICK sink") );
}

each time I access to pEvtObj I got an access violation...

To connect tht interface I've used DIID_HTMLButtonElementEvents because
DIID_HTMLElementEvents is not supported by the HTMLElement... I do not know
why!!

The element is a button inside a html page...

here is the code I've used to connect the event interface:

HRESULT hr;

    LPDISPATCH pBrowserDispatch = NULL;
    IUnknown* pUnkBrowser = NULL;
    IHTMLDocument2* pDocument2 = NULL;
    IDispatch* pDocumentDispatch = NULL;

    pUnkBrowser = m_Browser.GetControlUnknown();
    if( !pUnkBrowser )
        return;

    pUnkBrowser->QueryInterface( IID_IDispatch, (void**)&pBrowserDispatch );
    if( !pBrowserDispatch )
        return;

    if( pDisp == pBrowserDispatch )
    {
        pDocumentDispatch = m_Browser.get_Document();

        if( pDocumentDispatch )
        {
            pDocumentDispatch->QueryInterface( IID_IHTMLDocument2,
(void**)&pDocument2 );

            BOOL a = AfxConnectionAdvise( pDocument2, DIID_HTMLDocumentEvents2,
m_pEventSink->GetIDispatch(FALSE), FALSE, &m_dwEventSink );

            IHTMLElementCollection* pElemCollection = NULL;

            hr = pDocument2->get_all( &pElemCollection );

            if( SUCCEEDED(hr) )
            {
                // Obtained element collection.
                IDispatch* pElementDispatch = NULL;
                IHTMLElement* pElement = NULL;

                pElemCollection->item( COleVariant( _T("ale")), COleVariant((long)0),
&pElementDispatch );

                if( pElementDispatch )
                {
                    hr = pElementDispatch->QueryInterface(IID_IHTMLElement,
(void**)&pElement);

                    if( pElement )
                    {
                        //ConnectEvents( pElement );
                        AfxConnectionAdvise( pElement, DIID_HTMLButtonElementEvents,
m_pEventSink->GetIDispatch(FALSE), FALSE, &m_dwEventSink );
                        pElement->Release();
                    }

                    pElementDispatch->Release();

                }

                pElemCollection->Release();
            }

            pDocument2->Release();
        }
    }

    pBrowserDispatch->Release();

Thanks
Ale