Re: Trying to handle events from HTMLElementEvents...

From:

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

Newsgroups:

microsoft.public.vc.mfc

Date:

Thu, 27 Jul 2006 05:04:01 -0700

Message-ID:

<E5741B5B-30AE-4D6E-9FB2-4652089286FA@microsoft.com>

maybe...
The problem was on VTS_VARIANT instead of VTS_UNKNOWN
However, such interface has not the member get_SrcElement, infact it returns
such error...
I to get onclick from a button?
thanks

ale

"Jeff Partch" wrote:

This is just off the top of my head, but it might be because there is no
IHTMLEventObj.

The documentation for the HTMLButtonElementEvents::onclick event prototypes
it as...

VARIANT_BOOL onclick(VOID)

....whereas for the HTMLButtonElementEvents2::onclick event it is...

VARIANT_BOOL onclick(IHTMLEventObj *pEvtObj)

--
Jeff Partch [VC++ MVP]

"Ale" <Ale@discussions.microsoft.com> wrote in message
news: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