Trying to handle events from HTMLElementEvents...

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From: Ale on 26 Jul 2006 21:52

---

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

From: Jeff Partch on 27 Jul 2006 02:15

---

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(a)discussions.microsoft.com> wrote in message
news:C3657EF5-0B66-419A-BDD1-923C741C5FE1(a)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

From: Ale on 27 Jul 2006 08:04

---

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(a)discussions.microsoft.com> wrote in message
> news:C3657EF5-0B66-419A-BDD1-923C741C5FE1(a)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
>
>
>

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