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ie编程的一个问题。我该如何捕捉BeforeNavigate2事件
使用MSHTML Editing的browse模式，希望在navigate之前判断一下它的url是什么。使用连接点+IDisppatch捕获事件，我应该advise到哪个连接点？
对com和ie编程不是很熟。不知道问题有没说清楚。请指教。
谢谢。
对com和ie编程不是很熟。不知道问题有没说清楚。请指教。
谢谢。
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蒋晟 2002-05-10
不是每一个document都有webbrowser的，在某些版本的IE中，Frame的Document没有对应的webbrowser
参见http://www.csdn.net/Develop/read_article.asp?id=10175
参见http://www.csdn.net/Develop/read_article.asp?id=10175
chenzhou35 2002-05-10
uuuuuuuup
chenzhou35 2002-05-09
我把上面得代码改写成了如下代码：
IServiceProvider* isp ;
pDoc->QueryInterface(IID_IServiceProvider,(void **)&isp);
IWebBrowser2* iwb2;
hr = isp->QueryService( IID_IWebBrowserApp,IID_IWebBrowser2, (void**)&iwb2);
但是返回E_NOINTERFACE。都不知道是怎么回事了。
IServiceProvider* isp ;
pDoc->QueryInterface(IID_IServiceProvider,(void **)&isp);
IWebBrowser2* iwb2;
hr = isp->QueryService( IID_IWebBrowserApp,IID_IWebBrowser2, (void**)&iwb2);
但是返回E_NOINTERFACE。都不知道是怎么回事了。
蒋晟 2002-05-09
A
This is a common cause for COM consternation. You have the window, document, or browser and you know you should be able to get the others, but everywhere you turn, QueryInterface delivers a big fat NULL. The answer lies in the mysterious IServiceProvider whose job it is, well, to provide services. IServiceProvider is a great interface: it has only one method, QueryService. If you’re using ATL smart pointers, it looks like this. First, you have to get the IServiceProvider.
CComQIPtr<IServiceProvider> isp = pIHTMLDocument2;
This does a QueryInterface on the document for IServiceProvider. Once you have it, you can get the browser like so.
CComQIPtr<IWebBrowser2> iwb2;
isp->QueryService(IID_IWebBrowserApp,
IID_IWebBrowser2, (void**)&iwb2);
If all this seems confusing, there’s a good reason for it. A cardinal rule of COM is that QueryInterface must always return an interface to the object queried. But the document doesn’t implement IWebBrowser2; it only knows how to get the object that does. The document, browser, and window are all separate objects. In general, IServiceProvider is used whenever a bunch of separate but related COM objects together implement some kind of service. QueryInterface asks an object, do you implement this interface? QueryService tells a service provider, "get me whatever object implements this interface, please." With QueryService, the interface pointer returned may or may not be the same object as the one queried. Figure 6 illustrates the system. All the objects implement their various interfaces and store internal pointers to one another; IServiceProvider is your way to get whichever object implements a particular interface. IServiceProvider::QueryService chases the internal pointers to retrieve the object that implements the interface you want.
This is a common cause for COM consternation. You have the window, document, or browser and you know you should be able to get the others, but everywhere you turn, QueryInterface delivers a big fat NULL. The answer lies in the mysterious IServiceProvider whose job it is, well, to provide services. IServiceProvider is a great interface: it has only one method, QueryService. If you’re using ATL smart pointers, it looks like this. First, you have to get the IServiceProvider.
CComQIPtr<IServiceProvider> isp = pIHTMLDocument2;
This does a QueryInterface on the document for IServiceProvider. Once you have it, you can get the browser like so.
CComQIPtr<IWebBrowser2> iwb2;
isp->QueryService(IID_IWebBrowserApp,
IID_IWebBrowser2, (void**)&iwb2);
If all this seems confusing, there’s a good reason for it. A cardinal rule of COM is that QueryInterface must always return an interface to the object queried. But the document doesn’t implement IWebBrowser2; it only knows how to get the object that does. The document, browser, and window are all separate objects. In general, IServiceProvider is used whenever a bunch of separate but related COM objects together implement some kind of service. QueryInterface asks an object, do you implement this interface? QueryService tells a service provider, "get me whatever object implements this interface, please." With QueryService, the interface pointer returned may or may not be the same object as the one queried. Figure 6 illustrates the system. All the objects implement their various interfaces and store internal pointers to one another; IServiceProvider is your way to get whichever object implements a particular interface. IServiceProvider::QueryService chases the internal pointers to retrieve the object that implements the interface you want.
chenzhou35 2002-05-09
通过IHTMLDocument2怎样可以获得IWebBrowser2的接口指针？
蒋晟 2002-05-09
http://www.microsoft.com/msj/defaultframe.asp?page=/msj/0698/browser.htm&nav=/msj/0698/newnav.htm
June 1998
Keeping an Eye on Your Browser by Monitoring Internet Explorer 4.0 Events
June 1998
Keeping an Eye on Your Browser by Monitoring Internet Explorer 4.0 Events
weblove 2002-05-09
留下你的E-MAIL，我给你个源代码
蒋晟 2002-05-09
去看看MFC的CHTMLView里面怎么捕获的
你的lpUnk是Document吧？要用Browser的才可以
你的lpUnk是Document吧？要用Browser的才可以
chenzhou35 2002-05-09
但是我枚举了它的所有连节点，只有如下：
IID_IPropertyNotifySink
IID_HTMLDocumentEvents
IID_HTMLDocumentEvents2
IID_ITridentEventSink
IID_IDispatch
共5个。我已经试过1，2，5。都不能使我捕获到这个消息。而3，4放进去无法编译。说未定义。
我该怎么办？？？？？
IID_IPropertyNotifySink
IID_HTMLDocumentEvents
IID_HTMLDocumentEvents2
IID_ITridentEventSink
IID_IDispatch
共5个。我已经试过1，2，5。都不能使我捕获到这个消息。而3，4放进去无法编译。说未定义。
我该怎么办？？？？？
chenzhou35 2002-05-09
快出手啊！！！！
下个星期我就要去度婚假了。如果弄不出来好难启程的 。:(
多帮忙！！！！！
下个星期我就要去度婚假了。如果弄不出来好难启程的 。:(
多帮忙！！！！！
蒋晟 2002-05-09
BeforeNavigate2是Browser的事件，不是Document的
chenzhou35 2002-05-09
是啊，我也知道。
befornaviage的ID是：DISPID_BEFORENAVIGATE2
但是，我的代码
CImpIDispatch::Invoke(
/* [in] */ DISPID dispIdMember,
/* [in] */ REFIID riid,
/* [in] */ LCID lcid,
/* [in] */ WORD wFlags,
/* [out][in] */ DISPPARAMS* pDispParams,
/* [out] */ VARIANT* pVarResult,
/* [out] */ EXCEPINFO* pExcepInfo,
/* [out] */ UINT* puArgErr)
{
if ( dispIdMember == DISPID_BEFORENAVIGATE2 )
int x = 0;//beforenavigate
if ( dispIdMember == DISPID_HTMLDOCUMENTEVENTS_ONMOUSEUP )
int y = 0;//mouse up
return S_OK;
}
却只能捕捉到鼠标up的事件。
advise的代码如下：
（其中：CImpIDispatch* m_pDocEvents; ）
if ( lpUnk != NULL )
{
IConnectionPointContainer* pCPC;
hr = lpUnk->QueryInterface(IID_IConnectionPointContainer, (void **)&pCPC);
if (hr == S_OK)
{
hr = pCPC->FindConnectionPoint( DIID_HTMLDocumentEvents, &m_pConnectionPoint );
//我想是不是，这个地方的DIID_HTMLDocumentEvents该换成别的，如果是，该是什么呢？
if (hr == S_OK)
{
// Now we can advise the connectionpoint
hr = m_pConnectionPoint->Advise( m_pDocEvents, &m_dwConnectCookie );
}
pCPC->Release();
}
}
befornaviage的ID是：DISPID_BEFORENAVIGATE2
但是，我的代码
CImpIDispatch::Invoke(
/* [in] */ DISPID dispIdMember,
/* [in] */ REFIID riid,
/* [in] */ LCID lcid,
/* [in] */ WORD wFlags,
/* [out][in] */ DISPPARAMS* pDispParams,
/* [out] */ VARIANT* pVarResult,
/* [out] */ EXCEPINFO* pExcepInfo,
/* [out] */ UINT* puArgErr)
{
if ( dispIdMember == DISPID_BEFORENAVIGATE2 )
int x = 0;//beforenavigate
if ( dispIdMember == DISPID_HTMLDOCUMENTEVENTS_ONMOUSEUP )
int y = 0;//mouse up
return S_OK;
}
却只能捕捉到鼠标up的事件。
advise的代码如下：
（其中：CImpIDispatch* m_pDocEvents; ）
if ( lpUnk != NULL )
{
IConnectionPointContainer* pCPC;
hr = lpUnk->QueryInterface(IID_IConnectionPointContainer, (void **)&pCPC);
if (hr == S_OK)
{
hr = pCPC->FindConnectionPoint( DIID_HTMLDocumentEvents, &m_pConnectionPoint );
//我想是不是，这个地方的DIID_HTMLDocumentEvents该换成别的，如果是，该是什么呢？
if (hr == S_OK)
{
// Now we can advise the connectionpoint
hr = m_pConnectionPoint->Advise( m_pDocEvents, &m_dwConnectCookie );
}
pCPC->Release();
}
}
蒋晟 2002-05-09
每个事件都有自己的ID的
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