ie bho:如何获取浏览器onscroll事件

Question

我写了一个简单的bho插件。
已经可以处理DISPID_DOCUMENTCOMPLETE。
但是 DISPID_HTMLWINDOWEVENTS2_ONSCROLL 不可以处理。这是class部分的代码class ATL_NO_VTABLE Chellobho :
public CComObjectRootEx<CComSingleThreadModel>,
public CComCoClass<Chellobho, &CLSID_hellobho>,
public IObjectWithSiteImpl<Chellobho>,
public IDispatchImpl<Ihellobho, &IID_Ihellobho, &LIBID_flash_bhoLib, /*wMajor =*/ 1, /*wMinor =*/ 0>,
public IDispEventImpl<1, Chellobho, &DIID_DWebBrowserEvents2, &LIBID_SHDocVw, 1, 1>,
public IDispEventImpl<3, Chellobho, &DIID_HTMLWindowEvents2, &LIBID_MSHTML, 4, 0>
这是注册部分的代码BEGIN_SINK_MAP(Chellobho)
    SINK_ENTRY_EX(1, DIID_DWebBrowserEvents2, DISPID_DOCUMENTCOMPLETE, OnDocumentComplete)
SINK_ENTRY_EX(3, DIID_HTMLWindowEvents2, DISPID_HTMLWINDOWEVENTS2_ONSCROLL, OnScroll)
END_SINK_MAP()
这是SetSite函数STDMETHODIMP Chellobho::SetSite(IUnknown* pUnkSite)
{
Sleep(3000);
MessageBox( NULL, L"SetSite", L"SetSite", MB_OK );
IDispatch *pDisp2;
CComQIPtr<IHTMLDocument2, &IID_IHTMLDocument2> spHTML2;
    CComPtr<IHTMLWindow2> htmlWindow;    if (pUnkSite != NULL)
    {
        // Cache the pointer to IWebBrowser2.
        HRESULT hr = pUnkSite->QueryInterface(IID_IWebBrowser2, (void **)&m_spWebBrowser);
        if (SUCCEEDED(hr))
        {
hr = IDispEventSimpleImpl<1,Chellobho,&DIID_DWebBrowserEvents2>::DispEventAdvise(m_spWebBrowser);
hr = m_spWebBrowser->get_Document(&pDisp2); //test
            spHTML2 = pDisp2;
//if ( spHTML2 ) {
spHTML2->get_parentWindow(&htmlWindow);
hr = IDispEventSimpleImpl<3,Chellobho,&DIID_HTMLWindowEvents2>::DispEventAdvise(htmlWindow);
if (SUCCEEDED(hr))
{
m_fAdvised = TRUE;
}
//}
        }
    }
    else
    {
        // Unregister event sink.
        if (m_fAdvised)
        {
IDispEventSimpleImpl<1,Chellobho,&DIID_DWebBrowserEvents2>::DispEventUnadvise(m_spWebBrowser);
            IDispEventSimpleImpl<3,Chellobho,&DIID_HTMLWindowEvents2>::DispEventUnadvise(htmlWindow);
            m_fAdvised = FALSE;
        }        // Release cached pointers and other resources here.
        m_spWebBrowser.Release();
    }    // Call base class implementation.
    return IObjectWithSiteImpl<Chellobho>::SetSite(pUnkSite);
}
iebhoonscroll

Answer 1

http://stackoverflow.com/questions/9539410/ie9-fails-to-fire-onscroll-event-on-htmlwindow2-in-bho
看看这个有帮助吧

Answer 2

http://efreedom.com/Question/1-8472829/BHO-IE-Capture-OnScroll-Event-Site-Meta-Tag-Content-IE
这个更详细

Answer 3

onscroll可能没有被实现，只有少数几个事件像DISPID_DOCUMENTCOMPLETE是被mshtml实现了的。对于这个问题，我建议你通过定时器实现，让定时器轮训IHTMLElement2的scrollTop和scrollLeft是否发生变化。mshtml的html事件很多都没有实现，而且不同版本的浏览器会有一些问题。

Answer 4

CComPtr<IHTMLElement> elemscroll;
IHTMLElement2* elem2scroll;
CComPtr<IDispatch> spDisp;
IHTMLWindow2 *htmlwin2;
HRESULT hr = mWebBrowser2->get_Document(&spDisp);
CComQIPtr<IHTMLDocument2, &IID_IHTMLDocument2> spHTML(spDisp);
spHTML->QueryInterface(IID_IHTMLDocument3,(void**)&pHTMLDoc3);
pHTMLDoc3->get_documentElement(&elemscroll);
elemscroll->QueryInterface(IID_IHTMLElement2,(void**)&elem2scroll);
elem2scroll->get_scrollTop(&scrolltop);
elem2scroll->get_scrollLeft(&scrollleft);