Error 0x80040200 when trying to handle HTML Element Events

See more:

HTML

MFC

event

I am writing an MFC application that subclasses CHtmlView. I want to be able to handle mouse clicks events from buttons in the browser control.

I have implemented the code from this URL:

http://msdn.microsoft.com/en-us/library/bb508508.aspx
(titled: Handling HTML Element Events)

At runtime, an error is thrown from this code:

void CMyClass::ConnectEvents(IHTMLElement* pElem)
{
    HRESULT hr;
    IConnectionPointContainer* pCPC = NULL;
    IConnectionPoint* pCP = NULL;
    DWORD dwCookie;

    // Check that this is a connectable object.
    hr = pElem->QueryInterface(IID_IConnectionPointContainer, (void**)&pCPC);

    if (SUCCEEDED(hr))
    {
        // Find the connection point.
        hr = pCPC->FindConnectionPoint(DIID_HTMLElementEvents2, &pCP);

        if (SUCCEEDED(hr))
        {
            // Advise the connection point.
            // pUnk is the IUnknown interface pointer for your event sink
            hr = pCP->Advise(pUnk, &dwCookie);

            if (SUCCEEDED(hr))
            {
                // Successfully advised
            }

            pCP->Release();
        }

        pCPC->Release();
    }
} 

The error occurs when executing the FindConnectionPoint statement.

I have verified that the HTML element is being found and the IHTMLElement pointer is being set properly in the calling method by:

hr = pElemDisp->QueryInterface(IID_IHTMLElement, (void**)&pElem);

Can anyone offer suggestions about further debugging steps?

Thank you.