(IE BHO) Get IWebBrowser2 from BeforeNavigate2 event

[aj3423]

I'm working on an IE BHO, in the BeforeNavigate2 event, how can I get the pointer to IWebBrowser2? here's my code:

STDMETHODIMP CEventSink::Invoke(DISPID dispIdMember, .....) {
    IWebBrowser2* pSite = 0;
    HRESULT hr;

if(dispIdMember == DISPID_BEFORENAVIGATE2) {

    hr = ((IDispatch*)pDispParams->rgvarg[0].pdispVal)->QueryInterface(IID_IWebBrowser2, (void**)&pSite);// This line Crashes 

the MSDN http://msdn.microsoft.com/en-us/library/aa768280%28VS.85%29.aspx
says the first parameter is

A pointer to the IDispatch interface for the WebBrowser object that represents the window or frame. This interface can be queried for the IWebBrowser2 interface.

What's wrong with my code ?

Thanks in advance.

[andywestken]

You shouldn't need the IDispatch* cast as that's the type of pdispVal (casts should not be used unnecessarily.)

Is the vt (VARTYPE) member of rgvarg[0] set to VT_DISPATCH as you expect? (pdispVal is only valid if this is the case.)

What hr value is QueryInterface returning? Or is your code blowing up??

Andy

[aj3423]

Thanks, it turns out that the parameters are in the reverse order, so rgvarg[6] is the correct arg.