Problem with capturing OnClick event using HTMLDocumentEvents2 in BHO

Question

I fire BHO and I try to catch OnClick events using HTMLDocumentEvents2 however the events never reach the handler.

this is what i am doing:

class ATL_NO_VTABLE CBlastBhoBHO :
  public CComObjectRootEx<CComSingleThreadModel>,
  public CComCoClass<CBlastBhoBHO, &CLSID_BlastBhoBHO>,
  public IObjectWithSiteImpl<CBlastBhoBHO>,
  public IDispatchImpl<IBlastBhoBHO, &IID_IBlastBhoBHO, &LIBID_BlastBhoLib, /*wMajor     =*/ 1, /*wMinor =*/ 0>,
  public IDispEventImpl<0, CBlastBhoBHO, &DIID_HTMLDocumentEvents2, &LIBID_MSHTML, 1, 0>,
  public IDispEventImpl<1, CBlastBhoBHO, &DIID_DWebBrowserEvents2, &LIBID_SHDocVw, 1, 1>



BEGIN_SINK_MAP(CBlastBhoBHO)
SINK_ENTRY_EX(0, DIID_HTMLDocumentEvents2, DISPID_HTMLDOCUMENTEVENTS2_ONCLICK,   OnClickTrigger)
SINK_ENTRY_EX(1, DIID_DWebBrowserEvents2, DISPID_DOCUMENTCOMPLETE,      OnDocumentComplete)
END_SINK_MAP()


// Handlers
void STDMETHODCALLTYPE CBlastBhoBHO::OnDocumentComplete( IDispatch *pDisp, VARIANT *url) { // works fine }
void STDMETHODCALLTYPE CBlastBhoBHO::OnClickTrigger(IHTMLEventObj *pEvtObj) { // Never called }

// From SetSite()
  ATL::IDispEventSimpleImpl<1,CBlastBhoBHO,&DIID_DWebBrowserEvents2>::DispEventAdvise(m_spWebBrowser); 


// From OnDocumentComplete
 CComQIPtr<IHTMLDocument3> doc_;
m_spWebBrowser->get_Document((IDispatch**) &doc_);
ATL::IDispEventSimpleImpl<0,CBlastBhoBHO,&DIID_HTMLDocumentEvents2>::DispEventAdvise(doc_);

I tried several options (using HTMLElementEvents2, etc.) or Consulting on various objects or Consulting on a document from SetSite. my handler is never called.

Any help would be greatly appreciated. all i need is an onClick event.

Answer 1

Perhaps due to a mismatch in the version of LIBID_MSHTML, try changing it to version 4.0, i.e. change everything

IDispEventImpl<0, CBlastBhoBHO, &DIID_HTMLDocumentEvents2, &LIBID_MSHTML, 1, 0>

to

IDispEventImpl<0, CBlastBhoBHO, &DIID_HTMLDocumentEvents2, &LIBID_MSHTML, 4, 0>

Answer 2

-

VARIANT_BOOL attachEvent( _bstr_t event, IDispatch *pdisp)

Ex: -

MSHTML::IHTMLDocument3Ptr pDoc3 = 0;
pDoc.QueryInterface(IID_IHTMLDocument3,&pDoc3);
IDispatchEx evtClick;

pDoc3->attachEvent(_bstr_t(L"onclick"),&evtClick);