IE 可以在使用文档模式时触发 onscroll 事件:IE7 或 IE8,但fail在使用文档模式时触发 onscroll 事件:<强>IE9。我还在 documentElement 上注册了 onscroll 事件,它的 react 方式相同。
BHO 类使用:
public IDispEventImpl<3, CHelloWorldBHO, &DIID_HTMLWindowEvents2, &LIBID_MSHTML, 4, 0>.
并接收事件:
BEGIN_SINK_MAP(CHelloWorldBHO)
SINK_ENTRY_EX(1, DIID_DWebBrowserEvents2, DISPID_DOCUMENTCOMPLETE, OnDocumentComplete)
SINK_ENTRY_EX(1, DIID_DWebBrowserEvents2, DISPID_NAVIGATECOMPLETE2, OnNavigateComplete2)
SINK_ENTRY_EX(1, DIID_DWebBrowserEvents2, DISPID_WINDOWSTATECHANGED, OnWindowStateChanged)
SINK_ENTRY_EX(3, DIID_HTMLWindowEvents2, DISPID_HTMLWINDOWEVENTS2_ONSCROLL, OnScroll)
END_SINK_MAP()
然后将其通知到Document Complete中的window对象:
CComQIPtr<IHTMLDocument2> spHTMLDoc = spDispDoc;
CComQIPtr<IHTMLWindow2> spTempWindow2;
spHTMLDoc->get_parentWindow(&spTempWindow2);
IDispEventImpl<3, CHelloWorldBHO, &DIID_HTMLWindowEvents2, &LIBID_MSHTML, 4, 0>::DispEventAdvise(spTempWindow2);
我已经研究这个问题很长一段时间了。有任何想法吗?非常感谢!
最佳答案
对于 IE9 和文档模式 = IE9,您需要使用"new"事件。
hr = _spDocument->get_parentWindow(reinterpret_cast<IHTMLWindow2 **>(&_spWindow));
if (SUCCEEDED(hr) && _spWindow)
{
// If document mode is lower than 9 we can had the OnScrollEvent the old way
if(_uiDocumentMode < 9)
{
hr = IDispEventImpl<2, CIEPage, &DIID_HTMLWindowEvents2, &LIBID_MSHTML, 4, 0>::DispEventAdvise(_spWindow);
if(SUCCEEDED(hr))
{
...
}
}
else
{
CComPtr<IEventTarget> spIEventTarget;
hr = _spWindow->QueryInterface(IID_IEventTarget, reinterpret_cast<void **>(&spIEventTarget));
if (SUCCEEDED(hr) && spIEventTarget)
{
_spEventScroll = new CIE9UIEvent(); // This class must derive from IDispatchEx
CComPtr<IDispatch> spIDispatch;
HRESULT hr = _spEventScroll->QueryInterface(IID_IDispatch, reinterpret_cast<void **>(&spIDispatch)); // Get the IDispatch
if (SUCCEEDED(hr) && spIDispatch)
{
// If _spEventScroll is used instead of spIDispatch, an exception will occurr!!!
hr = _spIEventTarget->addEventListener(_bstr_t("scroll"), spIDispatch, VARIANT_TRUE);
if (SUCCEEDED(hr))
{
...
}
}
}
}
}
现在在你的派生类上...
//////////////////////////////////////////////////////////////////////
// InvokeEx
//////////////////////////////////////////////////////////////////////
HRESULT STDMETHODCALLTYPE CIE9UIEvent::InvokeEx(
__in DISPID dispIdMember,
__in LCID lcid,
__in WORD wFlags,
__in DISPPARAMS* pDispParams,
__out_opt VARIANT *pvarRes,
__out_opt EXCEPINFO *pei,
__in_opt IServiceProvider *pspCaller)
{
if(dispIdMember == 0 && pDispParams->cArgs == 2)
{
if(pDispParams->rgvarg[1].vt == VT_DISPATCH && pDispParams->rgvarg[1].pdispVal)
{
CComPtr<IDOMEvent> spIDOMEvent;
HRESULT hr = pDispParams->rgvarg[1].pdispVal->QueryInterface(IID_IDOMEvent, reinterpret_cast<void **>(&spIDOMEvent));
if(SUCCEEDED(hr) && spIDOMEvent)
{
...
}
}
}
return S_OK;
}
最后一步是在您的类 QueryInterface 方法中添加 IDispatchEx
//////////////////////////////////////////////////////////////////////
// QueryInterface
//////////////////////////////////////////////////////////////////////
HRESULT STDMETHODCALLTYPE CIE9EventListener::QueryInterface(REFIID riid, __RPC__deref_out void __RPC_FAR *__RPC_FAR *ppvObject)
{
*ppvObject = NULL;
if(IsEqualGUID(riid, IID_IUnknown))
*ppvObject = reinterpret_cast<void**>(this);
if(IsEqualGUID(riid, IID_IDispatch))
*ppvObject = reinterpret_cast<void**>(this);
if(IsEqualGUID(riid, IID_IDispatchEx))
*ppvObject = reinterpret_cast<void**>(this);
if(*ppvObject)
{
((IUnknown*)*ppvObject)->AddRef();
return S_OK;
}
return E_NOINTERFACE;
}
关于c++ - IE9 无法在 BHO 中的 HTMLWindow2 上触发 onscroll 事件,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/8472829/