Problem catching OnClick event using HTMLDocumentEvents2 in a BHO

Question

I am running a BHO and i am trying to catch OnClick events using HTMLDocumentEvents2 however, the events never seem to 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 have tried several variations(using HTMLElementEvents2 etc) or Advising on different objects or Advising on the document from SetSite. my handler is never called.

Any help would be much appreciated. all i need is the onClick event.

Answer 1

Probably because of the version mismatch of the LIBID_MSHTML, try change it to version 4.0, i.e. change all

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

to

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

Answer 2

Try This -

Function -

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);