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1、屏蔽错误信息提示
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m_pBrowserApp->put_Silent(VARIANT_TRUE); |
在CDHtmlDialog::OnInitDialog()的代码中首先了创建WebBrowser控件，然后把控件的Browser对象赋值给m_pBrowserApp（这是CDHtmlDialog完成的不需要自己处理）。WebBrowser的put_Silent函数在官方给出的说明是禁用所有的对话框，但例外情况是它不会影响SSL安全认证需要的进示对话框。绝大多数情况下这就可以解决问题了，记得很久以前我遇到过一种情况就是虽然调用了put_Silent但是还是有极个别的js错误是无法屏蔽掉的依然会显示出来(在网页含有嵌套页面时会错误无法屏蔽，不知道是否还有其它情况)，现在找不到这样的网页了，如果谁遇到这种情况了建议给我发上个URL让我也重温一下当年阳光灿烂的时刻。
2、控制错误提示并进行记录
这要比第一种方法复杂上许多，简短的来说就是自定义COleControlSite类并实现IOleCommandTarget接口，IOleCommandTarget接口是错误控制的关健，错误发生时会触发此接口的Exec函数并为nCmdID参数赋值为OLECMDID_SHOWSCRIPTERROR,这样就可以得到错误信息了。
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IOleCommandTarget : public IUnknown { public: virtual /* [input_sync] */ HRESULT STDMETHODCALLTYPE QueryStatus( /* [unique][in] */ __RPC__in_opt const GUID *pguidCmdGroup, /* [in] */ ULONG cCmds, /* [out][in][size_is] */ __RPC__inout_ecount_full(cCmds) OLECMD prgCmds[ ], /* [unique][out][in] */ __RPC__inout_opt OLECMDTEXT *pCmdText) = 0; virtual HRESULT STDMETHODCALLTYPE Exec( /* [unique][in] */ __RPC__in_opt const GUID *pguidCmdGroup, /* [in] */ DWORD nCmdID, /* [in] */ DWORD nCmdexecopt, /* [unique][in] */ __RPC__in_opt VARIANT *pvaIn, /* [unique][out][in] */ __RPC__inout_opt VARIANT *pvaOut) = 0; }; |
现在我们开始实现自定义的COleControlSite
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class CMyControlSite : public COleControlSite { public: CMyControlSite(COleControlContainer *pCntr):COleControlSite(pCntr) {}protected: DECLARE_INTERFACE_MAP() BEGIN_INTERFACE_PART(OleCommandTarget, IOleCommandTarget) STDMETHOD(QueryStatus)(const GUID *pguidCmdGroup, ULONG cCmds, OLECMD prgCmds[], OLECMDTEXT *pCmdText); STDMETHOD(Exec)(const GUID* pguidCmdGroup, DWORD nCmdID, DWORD nCmdexecopt, VARIANTARG* pvaIn, VARIANTARG* pvaOut); END_INTERFACE_PART(OleCommandTarget) |
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MFC提供了很多宏用于简化COM相关功能的开发，对COM接口的实现方式在MFC中具体体现方式是内嵌类，背后的设计思想是COM聚合，每个接口都产生一个内嵌类，所有的接口都聚合到外层的类。DECLARE_INTERFACE_MAP() 实际上就是定义一个数组以及查询操作，BEGIN_INTERFACE_PART定义一个命名为XOleCommandTarget的内嵌类(内嵌类的命名规则是XName)并定义IUnknown接口的三个方法AddRef、Release、QueryInterface。END_INTERFACE_PART定义一个m_xOleCommandTarget的成员类型为XOleCommandTarget(定义的成员命名规则就是m_xName)，并把XOleCommandTarget类声明为外层类的友元类在示例中外层类指CMyControlSite。
STDMETHOD宏定义为virtual __declspec(nothrow) HRESULT __stdcall，该宏定义函数为虚函数返回值为HRESULT，函数调用约定为__stdcall，并且在此函数上禁止异常。__declspec(nothrow)用定告诉编译器它修饰的函数以及此函数调用的函数不会产生C++异常调用从可以优化代码性能和代码尺寸（默认情况下C++编译器为了进行异常处理会在拥有throw调用的函数中自动生成相关的异常处理代码)。通常情况下HRESULT返回值就表达了错误信息，HRESULT是个32位值，不同的位域用于不同的目的，也可以使用自定义的位域，具体的信息可以参考http://en.wikipedia.org/wiki/HRESULT。由于COM本身的语言中立性所以不应该在COM组件对外公布的信息中掺杂特定语言相关的特性。如果需要提供更详尽的错误信息那么应该实现COM的IErrorInfo接口。言归正传以下是CMyControlSite的类实现代码
BEGIN_INTERFACE_MAP(CMyControlSite, COleControlSite) INTERFACE_PART(CMyControlSite, IID_IOleCommandTarget, OleCommandTarget)
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<em id="__mceDel"><em id="__mceDel">END_INTERFACE_MAP() HRESULT CMyControlSite::XOleCommandTarget::Exec (const GUID* pguidCmdGroup, DWORD nCmdID, DWORD nCmdexecopt, VARIANTARG* pvaIn, VARIANTARG* pvaOut ) { HRESULT hr = OLECMDERR_E_NOTSUPPORTED; //return S_OK; if (pguidCmdGroup && IsEqualGUID(*pguidCmdGroup, CGID_DocHostCommandHandler)) { switch (nCmdID) { case OLECMDID_SHOWSCRIPTERROR: { IHTMLDocument2* pDoc = NULL; IHTMLWindow2* pWindow = NULL; IHTMLEventObj* pEventObj = NULL; BSTR rgwszNames[5] = { <span>SysAllocString(L"errorLine"), </span><br><span>SysAllocString(L"errorCharacter"), </span><br><span>SysAllocString(L"errorCode"), </span><br><span>SysAllocString(L"errorMessage"), </span><br><span>SysAllocString(L"errorUrl")</span> }; DISPID rgDispIDs[5]; VARIANT rgvaEventInfo[5]; DISPPARAMS params; BOOL fContinueRunningScripts = true; params.cArgs = 0; params.cNamedArgs = 0; hr = pvaIn->punkVal->QueryInterface(IID_IHTMLDocument2, (void **) &pDoc); hr = pDoc->get_parentWindow(&pWindow); pDoc->Release(); hr = pWindow->get_event(&pEventObj); for (int i = 0; i < 5; i++) { hr = pEventObj->GetIDsOfNames(IID_NULL, &rgwszNames[i], 1, LOCALE_SYSTEM_DEFAULT, &rgDispIDs[i]); hr = pEventObj->Invoke(rgDispIDs[i], IID_NULL, LOCALE_SYSTEM_DEFAULT, DISPATCH_PROPERTYGET, ¶ms, &rgvaEventInfo[i], NULL, NULL); //可以在此记录错误信息</em></em> |
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//必须使用SysFreeString来释放SysAllocString分配的内存,SysAllocString在分配的内存中记录了字符的长度 SysFreeString(rgwszNames[i]); } // At this point, you would normally alert the user with // the information about the error, which is now contained // in rgvaEventInfo[]. Or, you could just exit silently. (*pvaOut).vt = VT_BOOL; if (fContinueRunningScripts) { // 在页面中继续执行脚本 (*pvaOut).boolVal = VARIANT_TRUE; } else { // 停止在页面中执行脚本 (*pvaOut).boolVal = VARIANT_FALSE; } break; } default: hr =OLECMDERR_E_NOTSUPPORTED; break; } } else { hr = OLECMDERR_E_UNKNOWNGROUP; } return (hr); } ULONG FAR EXPORT CMyControlSite::XOleCommandTarget::AddRef() { METHOD_PROLOGUE(CMyControlSite, OleCommandTarget) return pThis->ExternalAddRef(); } ULONG FAR EXPORT CMyControlSite::XOleCommandTarget::Release() { METHOD_PROLOGUE(CMyControlSite, OleCommandTarget) return pThis->ExternalRelease(); } HRESULT FAR EXPORT CMyControlSite::XOleCommandTarget::QueryInterface(REFIID riid, void **ppvObj) { METHOD_PROLOGUE(CMyControlSite, OleCommandTarget) HRESULT hr = (HRESULT)pThis->ExternalQueryInterface(&riid, ppvObj); return hr; } STDMETHODIMP CMyControlSite::XOleCommandTarget::QueryStatus( /* [unique][in] */ const GUID __RPC_FAR *pguidCmdGroup, /* [in] */ ULONG cCmds, /* [out][in][size_is] */ OLECMD __RPC_FAR prgCmds[ ], /* [unique][out][in] */ OLECMDTEXT __RPC_FAR *pCmdText ) { METHOD_PROLOGUE(CMyControlSite, OleCommandTarget) return OLECMDERR_E_NOTSUPPORTED; } |
实现CMyControlSite后需要应用到CDHtmlDialog上，重写CreateControlSite虚函数既可
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virtual BOOL CreateControlSite(COleControlContainer* pContainer, COleControlSite** ppSite, UINT nID , REFCLSID clsid ){ if(ppSite == NULL) { ASSERT(FALSE); return FALSE; } CMyControlSite *pBrowserSite = new CMyControlSite (pContainer, this); if (!pBrowserSite) return FALSE; *ppSite = pBrowserSite; return TRUE;} |
现在就可以去编译测试了。到目前还有一个问题没有考虑，如果这段代码整合到现有的CDHtmlDialog应用中而现有的代码使用了其它默认的设定比如说自定义WebBrowser的右健菜单或使用了GetIDispatch函数等情况下原有的代码就不能正常工作了。这部分功能是在MFC的CBrowserControlSite类中处理的，所以CMyControlSite应该把CBrowserControlSite的功能也实现一遍以使CDHtmlDialog的原有封装性不被破坏。在CMyControlSite中实现IDocHostUIHandler接口既可完成此功能。代码声明如下
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public: |
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CMyControlSite(COleControlContainer *pCnt, CDHtmlDialog *pHandler):COleControlSite(pCnt),m_pHandler(pHandler) {} |
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CDHtmlDialog *m_pHandler; |
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BEGIN_INTERFACE_PART(DocHostUIHandler, IDocHostUIHandler) STDMETHOD(ShowContextMenu)(DWORD, LPPOINT, LPUNKNOWN, LPDISPATCH); STDMETHOD(GetHostInfo)(DOCHOSTUIINFO*); STDMETHOD(ShowUI)(DWORD, LPOLEINPLACEACTIVEOBJECT, LPOLECOMMANDTARGET, LPOLEINPLACEFRAME, LPOLEINPLACEUIWINDOW); STDMETHOD(HideUI)(void); STDMETHOD(UpdateUI)(void); STDMETHOD(EnableModeless)(BOOL); STDMETHOD(OnDocWindowActivate)(BOOL); STDMETHOD(OnFrameWindowActivate)(BOOL); STDMETHOD(ResizeBorder)(LPCRECT, LPOLEINPLACEUIWINDOW, BOOL); STDMETHOD(TranslateAccelerator)(LPMSG, const GUID*, DWORD); STDMETHOD(GetOptionKeyPath)(OLECHAR **, DWORD); STDMETHOD(GetDropTarget)(LPDROPTARGET, LPDROPTARGET*); STDMETHOD(GetExternal)(LPDISPATCH*); STDMETHOD(TranslateUrl)(DWORD, OLECHAR*, OLECHAR **); STDMETHOD(FilterDataObject)(LPDATAOBJECT , LPDATAOBJECT*); END_INTERFACE_PART(DocHostUIHandler) |
以下是实现代码
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BEGIN_INTERFACE_MAP(CMyControlSite, COleControlSite) INTERFACE_PART(CMyControlSite, IID_IDocHostUIHandler, DocHostUIHandler) INTERFACE_PART(CMyControlSite, IID_IOleCommandTarget, OleCommandTarget)END_INTERFACE_MAP() STDMETHODIMP CMyControlSite::XDocHostUIHandler::GetExternal(LPDISPATCH *lppDispatch){ METHOD_PROLOGUE_EX_(CMyControlSite, DocHostUIHandler) return pThis->m_pHandler->GetExternal(lppDispatch);}STDMETHODIMP CMyControlSite::XDocHostUIHandler::ShowContextMenu( DWORD dwID, LPPOINT ppt, LPUNKNOWN pcmdTarget, LPDISPATCH pdispReserved){ METHOD_PROLOGUE_EX_(CMyControlSite, DocHostUIHandler) return pThis->m_pHandler->ShowContextMenu(dwID, ppt, pcmdTarget, pdispReserved);}STDMETHODIMP CMyControlSite::XDocHostUIHandler::GetHostInfo( DOCHOSTUIINFO *pInfo){ METHOD_PROLOGUE_EX_(CMyControlSite, DocHostUIHandler) return pThis->m_pHandler->GetHostInfo(pInfo);}STDMETHODIMP CMyControlSite::XDocHostUIHandler::ShowUI( DWORD dwID, LPOLEINPLACEACTIVEOBJECT pActiveObject, LPOLECOMMANDTARGET pCommandTarget, LPOLEINPLACEFRAME pFrame, LPOLEINPLACEUIWINDOW pDoc){ METHOD_PROLOGUE_EX_(CMyControlSite, DocHostUIHandler) return pThis->m_pHandler->ShowUI(dwID, pActiveObject, pCommandTarget, pFrame, pDoc);}STDMETHODIMP CMyControlSite::XDocHostUIHandler::HideUI(void){ METHOD_PROLOGUE_EX_(CMyControlSite, DocHostUIHandler) return pThis->m_pHandler->HideUI();}STDMETHODIMP CMyControlSite::XDocHostUIHandler::UpdateUI(void){ METHOD_PROLOGUE_EX_(CMyControlSite, DocHostUIHandler) return pThis->m_pHandler->UpdateUI();}STDMETHODIMP CMyControlSite::XDocHostUIHandler::EnableModeless(BOOL fEnable){ METHOD_PROLOGUE_EX_(CMyControlSite, DocHostUIHandler) return pThis->m_pHandler->EnableModeless(fEnable);}STDMETHODIMP CMyControlSite::XDocHostUIHandler::OnDocWindowActivate(BOOL fActivate){ METHOD_PROLOGUE_EX_(CMyControlSite, DocHostUIHandler) return pThis->m_pHandler->OnDocWindowActivate(fActivate);}STDMETHODIMP CMyControlSite::XDocHostUIHandler::OnFrameWindowActivate( BOOL fActivate){ METHOD_PROLOGUE_EX_(CMyControlSite, DocHostUIHandler) return pThis->m_pHandler->OnFrameWindowActivate(fActivate);}STDMETHODIMP CMyControlSite::XDocHostUIHandler::ResizeBorder( LPCRECT prcBorder, LPOLEINPLACEUIWINDOW pUIWindow, BOOL fFrameWindow){ METHOD_PROLOGUE_EX_(CMyControlSite, DocHostUIHandler) return pThis->m_pHandler->ResizeBorder(prcBorder, pUIWindow, fFrameWindow);}STDMETHODIMP CMyControlSite::XDocHostUIHandler::TranslateAccelerator( LPMSG lpMsg, const GUID* pguidCmdGroup, DWORD nCmdID){ METHOD_PROLOGUE_EX_(CMyControlSite, DocHostUIHandler) return pThis->m_pHandler->TranslateAccelerator(lpMsg, pguidCmdGroup, nCmdID);}STDMETHODIMP CMyControlSite::XDocHostUIHandler::GetOptionKeyPath( LPOLESTR* pchKey, DWORD dwReserved){ METHOD_PROLOGUE_EX_(CMyControlSite, DocHostUIHandler) return pThis->m_pHandler->GetOptionKeyPath(pchKey, dwReserved);}STDMETHODIMP CMyControlSite::XDocHostUIHandler::GetDropTarget( LPDROPTARGET pDropTarget, LPDROPTARGET* ppDropTarget){ METHOD_PROLOGUE_EX_(CMyControlSite, DocHostUIHandler) return pThis->m_pHandler->GetDropTarget(pDropTarget, ppDropTarget);}STDMETHODIMP CMyControlSite::XDocHostUIHandler::TranslateUrl( DWORD dwTranslate, OLECHAR* pchURLIn, OLECHAR** ppchURLOut){ METHOD_PROLOGUE_EX_(CMyControlSite, DocHostUIHandler) return pThis->m_pHandler->TranslateUrl(dwTranslate, pchURLIn, ppchURLOut);}STDMETHODIMP CMyControlSite::XDocHostUIHandler::FilterDataObject( LPDATAOBJECT pDataObject, LPDATAOBJECT* ppDataObject){ METHOD_PROLOGUE_EX_(CMyControlSite, DocHostUIHandler) return pThis->m_pHandler->FilterDataObject(pDataObject, ppDataObject);}STDMETHODIMP_(ULONG) CMyControlSite::XDocHostUIHandler::AddRef(){ METHOD_PROLOGUE_EX_(CMyControlSite, DocHostUIHandler) return pThis->ExternalAddRef();}STDMETHODIMP_(ULONG) CMyControlSite::XDocHostUIHandler::Release(){ METHOD_PROLOGUE_EX_(CMyControlSite, DocHostUIHandler) return pThis->ExternalRelease();}STDMETHODIMP CMyControlSite::XDocHostUIHandler::QueryInterface( REFIID iid, LPVOID far* ppvObj) { METHOD_PROLOGUE_EX_(CMyControlSite, DocHostUIHandler) return pThis->ExternalQueryInterface(&iid, ppvObj);} |
STDMETHODIMP宏的定义是HRESULT __stdcall，STDMETHODIMP_宏指定了返回值，这两个宏用在cpp实现文件中，对应用于声明时使用的STDMETHOD和STDMETHOD_。
METHOD_PROLOGUE_EX_宏定义了pThis指针来指向外层类。
以上代码基于VS2008，由于不同版本的VS所带的MFC库版本不尽一致所以需要根本具体的版本来处理，目前已知的不同部分主要集中在CreateControlSite上。
CDHtmlDialog探索----WebBrowser扩展和网页Javascript错误处理
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原文地址：http://www.cnblogs.com/liaocheng/p/4221690.html
