2.在"项目"菜单上选择"添加类"。在"添加类对话框",选择"MFC 类"。在"MFC 类向导",在"名称"页的在类基类上选择"CCmdTarget",类名为CMySink,然后在选择支持自动化,下选择"自动化"。如下图所示:
3.MySink.h代码如下:
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// MySink.h : 头文件 #pragma once class CMySink : public CCmdTarget { DECLARE_DYNAMIC(CMySink) public: CMySink(CHtmlView *pParentHtmlView = NULL); virtual ~CMySink(); virtual void OnFinalRelease(); /** 捕获HTML滚动事件 */ void OnHtmlScroll(IHTMLEventObj *pEvtObj); protected: /** 父对象(CHtmlView指针) */ CHtmlView *m_pParentHtmlView; DECLARE_MESSAGE_MAP() DECLARE_DISPATCH_MAP() DECLARE_INTERFACE_MAP() }; |
MySink.cpp代码如下:
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// MySink.cpp : 实现文件 #include "stdafx.h" #include "TestHtmlView.h" #include "MySink.h" #include <mshtmdid.h> IMPLEMENT_DYNAMIC(CMySink, CCmdTarget) CMySink::CMySink(CHtmlView *pParentHtmlView) { m_pParentHtmlView = pParentHtmlView; EnableAutomation(); } CMySink::~CMySink() { } void CMySink::OnFinalRelease() { CCmdTarget::OnFinalRelease(); } BEGIN_MESSAGE_MAP(CMySink, CCmdTarget) END_MESSAGE_MAP() BEGIN_DISPATCH_MAP(CMySink, CCmdTarget) DISP_FUNCTION_ID(CMySink,"onscroll", DISPID_HTMLWINDOWEVENTS2_ONSCROLL, OnHtmlScroll, VT_EMPTY, VTS_DISPATCH) END_DISPATCH_MAP() BEGIN_INTERFACE_MAP(CMySink, CCmdTarget) INTERFACE_PART(CMySink, DIID_HTMLWindowEvents2, Dispatch) END_INTERFACE_MAP() void CMySink::OnHtmlScroll( IHTMLEventObj *pEvtObj ) { if (m_pParentHtmlView && m_pParentHtmlView->m_wndBrowser) { LPDISPATCH lpDispatch; lpDispatch = m_pParentHtmlView->GetHtmlDocument(); if (lpDispatch) { IHTMLDocument2 *pDocument2 = NULL; if (S_OK == lpDispatch->QueryInterface(IID_IHTMLDocument2, (LPVOID*)&pDocument2)) { IHTMLElement *pElement = NULL; if (S_OK == pDocument2->get_body(&pElement)) { IHTMLTextContainer *pTextContainer = NULL; if (S_OK == pElement->QueryInterface(IID_IHTMLTextContainer, (LPVOID*)&pTextContainer)) { long scrollTop, scrollLeft; if (S_OK == pTextContainer->get_scrollTop(&scrollTop) && S_OK == pTextContainer->get_scrollLeft(&scrollLeft)) { TRACE("Top %ld Left %ld\r\n", scrollTop, scrollLeft); } pTextContainer->Release(); } pElement->Release(); } pDocument2->Release(); } lpDispatch->Release(); } } } |
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#include "MySink.h" class CTestHtmlViewView : public CHtmlView { //... public: virtual void DocumentComplete(LPDISPATCH pDisp, VARIANT* URL); afx_msg void OnDestroy(); protected: CMySink *m_pSink; DWORD m_dwCookie; IHTMLWindow2 *m_pHTMLWindow2; BOOL IsMainFrame(LPDISPATCH pDisp); void SetHTMLWindow2Handler(); } |
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#include <afxctl.h> CTestHtmlViewView::CTestHtmlViewView() { m_pHTMLWindow2 = NULL; m_pSink = NULL; m_dwCookie = 0L; } void CTestHtmlViewView::OnInitialUpdate() { CHtmlView::OnInitialUpdate(); m_pSink = new CMySink(this); Navigate2(_T("g:\\a.html"), NULL, NULL); } void CTestHtmlViewView::OnDestroy() { if (m_pSink) { if (m_dwCookie) { AfxConnectionUnadvise(m_pHTMLWindow2, DIID_HTMLWindowEvents2, m_pSink->GetIDispatch(FALSE), FALSE, m_dwCookie); m_dwCookie = 0L; } if (m_pHTMLWindow2) { m_pHTMLWindow2->Release(); } delete m_pSink; TRACE("OnDestroy\r\n"); } CHtmlView::OnDestroy(); } void CTestHtmlViewView::DocumentComplete( LPDISPATCH pDisp, VARIANT* URL ) { UNUSED_ALWAYS(pDisp); ASSERT(V_VT(URL) == VT_BSTR); if (m_wndBrowser.m_hWnd && IsMainFrame(pDisp)) { TRACE("MainFrame DocumentComplete\r\n"); SetHTMLWindow2Handler(); } CString str(V_BSTR(URL)); OnDocumentComplete(str); } BOOL CTestHtmlViewView::IsMainFrame( LPDISPATCH pDisp ) { CComQIPtr<IWebBrowser2> spTempWebBrowser = pDisp; if (spTempWebBrowser && m_pBrowserApp && m_pBrowserApp.IsEqualObject(spTempWebBrowser)) return TRUE; return FALSE; } void CTestHtmlViewView::SetHTMLWindow2Handler() { LPDISPATCH pDisp = GetHtmlDocument(); if (pDisp) { IHTMLDocument2 *pDocument2 = NULL; if (S_OK == pDisp->QueryInterface(IID_IHTMLDocument2, (LPVOID*)&pDocument2)) { if (m_pHTMLWindow2) { if (m_dwCookie) { AfxConnectionUnadvise(m_pHTMLWindow2, DIID_HTMLWindowEvents2, m_pSink->GetIDispatch(FALSE), FALSE, m_dwCookie); m_dwCookie = 0L; } m_pHTMLWindow2->Release(); m_pHTMLWindow2 = NULL; } if (S_OK == pDocument2->get_parentWindow(&m_pHTMLWindow2)) { AfxConnectionAdvise(m_pHTMLWindow2, DIID_HTMLWindowEvents2, m_pSink->GetIDispatch(FALSE), FALSE, &m_dwCookie); } pDocument2->Release(); } pDisp->Release(); } } |
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