IE can fire onscroll event when using Document Mode: IE7 or IE8, but fail to fire onscroll event when using Document Mode: IE9. I also register the onscroll event on documentElement, it reacts the same way.
The BHO class uses:
public IDispEventImpl<3, CHelloWorldBHO, &DIID_HTMLWindowEvents2, &LIBID_MSHTML, 4, 0>.
And sink the event:
BEGIN_SINK_MAP(CHelloWorldBHO)
SINK_ENTRY_EX(1, DIID_DWebBrowserEvents2, DISPID_DOCUMENTCOMPLETE, OnDocumentComplete)
SINK_ENTRY_EX(1, DIID_DWebBrowserEvents2, DISPID_NAVIGATECOMPLETE2, OnNavigateComplete2)
SINK_ENTRY_EX(1, DIID_DWebBrowserEvents2, DISPID_WINDOWSTATECHANGED, OnWindowStateChanged)
SINK_ENTRY_EX(3, DIID_HTMLWindowEvents2, DISPID_HTMLWINDOWEVENTS2_ONSCROLL, OnScroll)
END_SINK_MAP()
Then Advise it to the window object in Document Complete:
CComQIPtr<IHTMLDocument2> spHTMLDoc = spDispDoc;
CComQIPtr<IHTMLWindow2> spTempWindow2;
spHTMLDoc->get_parentWindow(&spTempWindow2);
IDispEventImpl<3, CHelloWorldBHO, &DIID_HTMLWindowEvents2, &LIBID_MSHTML, 4, 0>::DispEventAdvise(spTempWindow2);
I have been working on this problem for quite a while. Any ideas? Thanks so much!
With IE9 and document mode = IE9 you need to use the "new" Events.
hr = _spDocument->get_parentWindow(reinterpret_cast<IHTMLWindow2 **>(&_spWindow));
if (SUCCEEDED(hr) && _spWindow)
{
// If document mode is lower than 9 we can had the OnScrollEvent the old way
if(_uiDocumentMode < 9)
{
hr = IDispEventImpl<2, CIEPage, &DIID_HTMLWindowEvents2, &LIBID_MSHTML, 4, 0>::DispEventAdvise(_spWindow);
if(SUCCEEDED(hr))
{
...
}
}
else
{
CComPtr<IEventTarget> spIEventTarget;
hr = _spWindow->QueryInterface(IID_IEventTarget, reinterpret_cast<void **>(&spIEventTarget));
if (SUCCEEDED(hr) && spIEventTarget)
{
_spEventScroll = new CIE9UIEvent(); // This class must derive from IDispatchEx
CComPtr<IDispatch> spIDispatch;
HRESULT hr = _spEventScroll->QueryInterface(IID_IDispatch, reinterpret_cast<void **>(&spIDispatch)); // Get the IDispatch
if (SUCCEEDED(hr) && spIDispatch)
{
// If _spEventScroll is used instead of spIDispatch, an exception will occurr!!!
hr = _spIEventTarget->addEventListener(_bstr_t("scroll"), spIDispatch, VARIANT_TRUE);
if (SUCCEEDED(hr))
{
...
}
}
}
}
}
Now on your derived class...
//////////////////////////////////////////////////////////////////////
// InvokeEx
//////////////////////////////////////////////////////////////////////
HRESULT STDMETHODCALLTYPE CIE9UIEvent::InvokeEx(
__in DISPID dispIdMember,
__in LCID lcid,
__in WORD wFlags,
__in DISPPARAMS* pDispParams,
__out_opt VARIANT *pvarRes,
__out_opt EXCEPINFO *pei,
__in_opt IServiceProvider *pspCaller)
{
if(dispIdMember == 0 && pDispParams->cArgs == 2)
{
if(pDispParams->rgvarg[1].vt == VT_DISPATCH && pDispParams->rgvarg[1].pdispVal)
{
CComPtr<IDOMEvent> spIDOMEvent;
HRESULT hr = pDispParams->rgvarg[1].pdispVal->QueryInterface(IID_IDOMEvent, reinterpret_cast<void **>(&spIDOMEvent));
if(SUCCEEDED(hr) && spIDOMEvent)
{
...
}
}
}
return S_OK;
}
Last step is to add in your class QueryInterface method the IDispatchEx
//////////////////////////////////////////////////////////////////////
// QueryInterface
//////////////////////////////////////////////////////////////////////
HRESULT STDMETHODCALLTYPE CIE9EventListener::QueryInterface(REFIID riid, __RPC__deref_out void __RPC_FAR *__RPC_FAR *ppvObject)
{
*ppvObject = NULL;
if(IsEqualGUID(riid, IID_IUnknown))
*ppvObject = reinterpret_cast<void**>(this);
if(IsEqualGUID(riid, IID_IDispatch))
*ppvObject = reinterpret_cast<void**>(this);
if(IsEqualGUID(riid, IID_IDispatchEx))
*ppvObject = reinterpret_cast<void**>(this);
if(*ppvObject)
{
((IUnknown*)*ppvObject)->AddRef();
return S_OK;
}
return E_NOINTERFACE;
}
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