在 Visual Basic.NET 應用程式中的文件事件的處理方式

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結論
本文將告訴您,如何在 Visual Basic.NET 中攔截 WebBrowser 控制項的文件事件。

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需求

下列清單列出建議的硬體、 軟體、 網路基礎結構及您需要的服務套件:
  • Microsoft Visual Studio.NET
  • Microsoft 網際網路總管 5.5 Service Pack 2 (SP2) 或更新版本
本文假設您已熟悉下列主題:
  • Visual Studio.NET
  • Internet Explorer
  • WebBrowser 控制項
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該技巧的描述

WebBrowser 控制項是在 Visual Studio.NET 或較早版本的 Microsoft Visual Studio 中使用簡單控制項。但是,您可能會發現它更難處理 WebBrowser 控制項在 Visual Studio.NET 中的事件。

下列的事件介面公開大部分的應用程式中處理的文件事件:
Mshtml.HTMLDocumentEvents2_Event				
若要處理事件,您必須建立您自己的 Sub 程序或事件發生時,您可以呼叫的函式。您必須符合所引發事件的簽章。下列的 Sub 程序處理文件的 MouseOver 事件時,例如:
Private Sub document_onmouseover(ByVal e As mshtml.IHTMLEventObj)				
事件處理常式是就地之後必須攔截該事件。您可以在 WebBrowser 控制項引發攔截事件 DocumentComplete 事件之後的任何時間。以下是勾點語法:
AddHandler CType(document, _mshtml.HTMLDocumentEvents2_Event).onmouseover, _AddressOf Me.document_onmouseover				
這個程式碼會呼叫 AddHandler 陳述式,並使用 CType 函式傳遞事件。CType 函式轉換為適當的型別 (mshtml.HTMLDocumentEvents2_Event) 文件物件,並再從所傳遞 OnMouseOver 事件。Me.document_onmouseoverSub 程序會傳遞至第二個參數 AddressOf 陳述式提供您處理常式的位址。

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建立專案並加入程式碼

下列範例中 WebBrowser 控制項瀏覽 http://www.microsoft.com。載入頁面之後此範例會攔截 OnMouseOverOnClick 事件。範例再加入文字至清單方塊時引發事件。
  1. 啟動 Visual Studio.NET。
  2. 在 Visual Basic.NET 中建立新的 Windows 應用程式專案
  3. 在專案中加入 Microsoft.mshtml 的參考。
  4. 在工具箱按一下 [一般]。
  5. 開啟面板上按一下滑鼠右鍵,然後按一下 [自訂工具箱]。
  6. 選取 [Microsoft Web 瀏覽器] 核取方塊,然後按一下 [確定]
  7. 在工具箱按兩下 [檔案總管]。
  8. 在工具箱中按一下 Windows Form,然後再連按兩下 清單方塊 控制項。
  9. 使它們容易檢視表單上排列控制項。
  10. 將下列程式碼加入至 AssemblyInfo.vb 頂端,取代現有的匯入句子
    Imports SystemImports System.DrawingImports System.CollectionsImports System.ComponentModelImports System.Windows.FormsImports System.DataImports System.ReflectionImports System.Runtime.InteropServicesImports System.ThreadingImports System.Diagnostics
  11. Add the following code between Windows Form Designer generated code and End Class in the code view of Form1.vb Public
    Shared dwCookie2 As Integer    Public Sub add_list(ByVal a As Object)        ListBox1.Items.Insert(0, a)    End Sub    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load        AxWebBrowser1.Navigate2("http://www.microsoft.com")        Dim x As IEEvents = New IEEvents(AxWebBrowser1)        x.fm = Me    End Sub    Private Sub AxWebBrowser1_Enter(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles AxWebBrowser1.Enter    End Sub    Private Sub AxWebBrowser1_DocumentComplete(ByVal sender As Object, ByVal e As AxSHDocVw.DWebBrowserEvents2_DocumentCompleteEvent) Handles AxWebBrowser1.DocumentComplete        Dim doc As mshtml.HTMLDocument        doc = AxWebBrowser1.Document        AddHandler CType(doc, _            mshtml.HTMLDocumentEvents2_Event).onclick, AddressOf Document_onclick        AddHandler CType(doc, _     mshtml.HTMLDocumentEvents2_Event).onmouseover, AddressOf Document_onmouseover    End Sub    Private Sub AxWebBrowser1_BeforeNavigate2(ByVal sender As Object, ByVal e As AxSHDocVw.DWebBrowserEvents2_BeforeNavigate2Event) Handles AxWebBrowser1.BeforeNavigate2        Dim doc As mshtml.HTMLDocument        doc = AxWebBrowser1.Document        RemoveHandler CType(doc, _            mshtml.HTMLDocumentEvents2_Event).onclick, _            AddressOf Document_onclick        RemoveHandler CType(doc, _            mshtml.HTMLDocumentEvents2_Event).onmouseover, _            AddressOf Document_onmouseover    End Sub    Private Sub Document_onmouseover(ByVal e As mshtml.IHTMLEventObj)        ListBox1.Items.Insert(0, "onMouseOver: " & _            e.srcElement.tagName.ToString())    End Sub    Private Function Document_onclick(ByVal e As mshtml.IHTMLEventObj) _            As Boolean        ListBox1.Items.Insert(0, "onClick: " & _            e.srcElement.tagName.ToString())        Return True    End Function
  12. Add the following code after End Class
    Public Class IEHTMLDocumentEvents    Implements mshtml.HTMLDocumentEvents2    Public Sub onactivate(ByVal pEvtObj As mshtml.IHTMLEventObj) Implements mshtml.HTMLDocumentEvents2.onactivate    End Sub    Public Sub onafterupdate(ByVal pEvtObj As mshtml.IHTMLEventObj) Implements mshtml.HTMLDocumentEvents2.onafterupdate    End Sub    Public Function onbeforeactivate(ByVal pEvtObj As mshtml.IHTMLEventObj) As Boolean Implements mshtml.HTMLDocumentEvents2.onbeforeactivate        Return True    End Function    Public Function onbeforedeactivate(ByVal pEvtObj As mshtml.IHTMLEventObj) As Boolean Implements mshtml.HTMLDocumentEvents2.onbeforedeactivate        Return True    End Function    Public Sub onbeforeeditfocus(ByVal pEvtObj As mshtml.IHTMLEventObj) Implements mshtml.HTMLDocumentEvents2.onbeforeeditfocus    End Sub    Public Function onbeforeupdate(ByVal pEvtObj As mshtml.IHTMLEventObj) As Boolean Implements mshtml.HTMLDocumentEvents2.onbeforeupdate        Return True    End Function    Public Sub oncellchange(ByVal pEvtObj As mshtml.IHTMLEventObj) Implements mshtml.HTMLDocumentEvents2.oncellchange    End Sub    Public Function onclick(ByVal pEvtObj As mshtml.IHTMLEventObj) As Boolean Implements mshtml.HTMLDocumentEvents2.onclick        Return True    End Function    Public Function oncontextmenu(ByVal pEvtObj As mshtml.IHTMLEventObj) As Boolean Implements mshtml.HTMLDocumentEvents2.oncontextmenu        Return True    End Function    Public Function oncontrolselect(ByVal pEvtObj As mshtml.IHTMLEventObj) As Boolean Implements mshtml.HTMLDocumentEvents2.oncontrolselect        Return True    End Function    Public Sub ondataavailable(ByVal pEvtObj As mshtml.IHTMLEventObj) Implements mshtml.HTMLDocumentEvents2.ondataavailable    End Sub    Public Sub ondatasetchanged(ByVal pEvtObj As mshtml.IHTMLEventObj) Implements mshtml.HTMLDocumentEvents2.ondatasetchanged    End Sub    Public Sub ondatasetcomplete(ByVal pEvtObj As mshtml.IHTMLEventObj) Implements mshtml.HTMLDocumentEvents2.ondatasetcomplete    End Sub    Public Function ondblclick(ByVal pEvtObj As mshtml.IHTMLEventObj) As Boolean Implements mshtml.HTMLDocumentEvents2.ondblclick        Return True    End Function    Public Sub ondeactivate(ByVal pEvtObj As mshtml.IHTMLEventObj) Implements mshtml.HTMLDocumentEvents2.ondeactivate    End Sub    Public Function ondragstart(ByVal pEvtObj As mshtml.IHTMLEventObj) As Boolean Implements mshtml.HTMLDocumentEvents2.ondragstart        Return True    End Function    Public Function onerrorupdate(ByVal pEvtObj As mshtml.IHTMLEventObj) As Boolean Implements mshtml.HTMLDocumentEvents2.onerrorupdate        Return True    End Function    Public Sub onfocusin(ByVal pEvtObj As mshtml.IHTMLEventObj) Implements mshtml.HTMLDocumentEvents2.onfocusin    End Sub    Public Sub onfocusout(ByVal pEvtObj As mshtml.IHTMLEventObj) Implements mshtml.HTMLDocumentEvents2.onfocusout    End Sub    Public Function onhelp(ByVal pEvtObj As mshtml.IHTMLEventObj) As Boolean Implements mshtml.HTMLDocumentEvents2.onhelp        Return True    End Function    Public Sub onkeydown(ByVal pEvtObj As mshtml.IHTMLEventObj) Implements mshtml.HTMLDocumentEvents2.onkeydown    End Sub    Public Function onkeypress(ByVal pEvtObj As mshtml.IHTMLEventObj) As Boolean Implements mshtml.HTMLDocumentEvents2.onkeypress        Return True    End Function    Public Sub onkeyup(ByVal pEvtObj As mshtml.IHTMLEventObj) Implements mshtml.HTMLDocumentEvents2.onkeyup    End Sub    Public Sub onmousedown(ByVal pEvtObj As mshtml.IHTMLEventObj) Implements mshtml.HTMLDocumentEvents2.onmousedown    End Sub    Public Sub onmousemove(ByVal pEvtObj As mshtml.IHTMLEventObj) Implements mshtml.HTMLDocumentEvents2.onmousemove    End Sub    Public Sub onmouseout(ByVal pEvtObj As mshtml.IHTMLEventObj) Implements mshtml.HTMLDocumentEvents2.onmouseout    End Sub    Public Sub onmouseover(ByVal pEvtObj As mshtml.IHTMLEventObj) Implements mshtml.HTMLDocumentEvents2.onmouseover    End Sub    Public Sub onmouseup(ByVal pEvtObj As mshtml.IHTMLEventObj) Implements mshtml.HTMLDocumentEvents2.onmouseup    End Sub    Public Function onmousewheel(ByVal pEvtObj As mshtml.IHTMLEventObj) As Boolean Implements mshtml.HTMLDocumentEvents2.onmousewheel        Return True    End Function    Public Sub onpropertychange(ByVal pEvtObj As mshtml.IHTMLEventObj) Implements mshtml.HTMLDocumentEvents2.onpropertychange    End Sub    Public Sub onreadystatechange(ByVal pEvtObj As mshtml.IHTMLEventObj) Implements mshtml.HTMLDocumentEvents2.onreadystatechange    End Sub    Public Sub onrowenter(ByVal pEvtObj As mshtml.IHTMLEventObj) Implements mshtml.HTMLDocumentEvents2.onrowenter    End Sub    Public Function onrowexit(ByVal pEvtObj As mshtml.IHTMLEventObj) As Boolean Implements mshtml.HTMLDocumentEvents2.onrowexit        Return True    End Function    Public Sub onrowsdelete(ByVal pEvtObj As mshtml.IHTMLEventObj) Implements mshtml.HTMLDocumentEvents2.onrowsdelete    End Sub    Public Sub onrowsinserted(ByVal pEvtObj As mshtml.IHTMLEventObj) Implements mshtml.HTMLDocumentEvents2.onrowsinserted    End Sub    Public Sub onselectionchange(ByVal pEvtObj As mshtml.IHTMLEventObj) Implements mshtml.HTMLDocumentEvents2.onselectionchange    End Sub    Public Function onselectstart(ByVal pEvtObj As mshtml.IHTMLEventObj) As Boolean Implements mshtml.HTMLDocumentEvents2.onselectstart        Return True    End Function    Public Function onstop(ByVal pEvtObj As mshtml.IHTMLEventObj) As Boolean Implements mshtml.HTMLDocumentEvents2.onstop        Return True    End FunctionEnd ClassPublic Class IEEvents    Implements SHDocVw.DWebBrowserEvents2    Public fm As Form1    Private icp As System.Runtime.InteropServices.UCOMIConnectionPoint    Private cookie As Integer = -1    Private m_ie As AxSHDocVw.AxWebBrowser    Public Sub New(ByRef ie As AxSHDocVw.AxWebBrowser)        ' Call QueryInterface for IConnectionPointContainer        m_ie = ie        Dim icpc As System.Runtime.InteropServices.UCOMIConnectionPointContainer = CType(ie.GetOcx(), System.Runtime.InteropServices.UCOMIConnectionPointContainer)        ' Find the connection point for the        ' DWebBrowserEvents2 source interface        Dim g As Guid = GetType(SHDocVw.DWebBrowserEvents2).GUID        icpc.FindConnectionPoint(g, icp)        'Pass a pointer to the host to the connection point        icp.Advise(Me, cookie)        ' Show the browser        ie.Visible = True        Dim oURL As Object = "http://www.microsoft.com"        Dim oEmpty As Object = ""        ie.Navigate2(oURL, oEmpty, oEmpty, oEmpty, oEmpty)    End Sub    Public Sub BeforeNavigate2(ByVal pDisp As Object, ByRef URL As Object, ByRef Flags As Object, ByRef TargetFrameName As Object, ByRef PostData As Object, ByRef Headers As Object, ByRef Cancel As Boolean) Implements SHDocVw.DWebBrowserEvents2.BeforeNavigate2    End Sub    Public Sub ClientToHostWindow(ByRef CX As Integer, ByRef CY As Integer) Implements SHDocVw.DWebBrowserEvents2.ClientToHostWindow    End Sub    Public Sub CommandStateChange(ByVal Command As Integer, ByVal Enable As Boolean) Implements SHDocVw.DWebBrowserEvents2.CommandStateChange    End Sub    Public Sub DocumentComplete(ByVal pDisp As Object, ByRef URL As Object) Implements SHDocVw.DWebBrowserEvents2.DocumentComplete        Dim doc As mshtml.HTMLDocument = CType(CType(pDisp, SHDocVw.IWebBrowser2).Document, mshtml.HTMLDocument)        Dim pConPtCon As System.Runtime.InteropServices.UCOMIConnectionPointContainer = CType(doc, System.Runtime.InteropServices.UCOMIConnectionPointContainer)        Dim guid As Guid = System.Type.GetType("mshtml.HTMLDocumentEvents2").GUID        Dim pConPt As System.Runtime.InteropServices.UCOMIConnectionPoint        pConPtCon.FindConnectionPoint(guid, pConPt)        Dim d As IEHTMLDocumentEvents = New IEHTMLDocumentEvents        pConPt.Advise(d, Form1.dwCookie2)        Dim iEvent As mshtml.HTMLDocumentEvents2_Event        iEvent = CType(doc, mshtml.HTMLDocumentEvents2_Event)        AddHandler iEvent.onclick, AddressOf ClickEventHandler        AddHandler iEvent.onmouseover, AddressOf MouseOverEventHandler    End Sub    Private Function ClickEventHandler(ByVal e As mshtml.IHTMLEventObj) As Boolean        fm.add_list(e.type + ":" + e.srcElement.tagName)        Return True    End Function    Private Sub MouseOverEventHandler(ByVal e As mshtml.IHTMLEventObj)        fm.add_list(e.type + ":" + e.srcElement.tagName)    End Sub    Public Sub DownloadBegin() Implements SHDocVw.DWebBrowserEvents2.DownloadBegin    End Sub    Public Sub DownloadComplete() Implements SHDocVw.DWebBrowserEvents2.DownloadComplete    End Sub    Public Sub FileDownload(ByRef Cancel As Boolean) Implements SHDocVw.DWebBrowserEvents2.FileDownload    End Sub    Public Sub NavigateComplete2(ByVal pDisp As Object, ByRef URL As Object) Implements SHDocVw.DWebBrowserEvents2.NavigateComplete2    End Sub    Public Sub NavigateError(ByVal pDisp As Object, ByRef URL As Object, ByRef Frame As Object, ByRef StatusCode As Object, ByRef Cancel As Boolean) Implements SHDocVw.DWebBrowserEvents2.NavigateError    End Sub    Public Sub NewWindow2(ByRef ppDisp As Object, ByRef Cancel As Boolean) Implements SHDocVw.DWebBrowserEvents2.NewWindow2    End Sub    Public Sub OnFullScreen(ByVal FullScreen As Boolean) Implements SHDocVw.DWebBrowserEvents2.OnFullScreen    End Sub    Public Sub OnMenuBar(ByVal MenuBar As Boolean) Implements SHDocVw.DWebBrowserEvents2.OnMenuBar    End Sub    Public Sub OnQuit() Implements SHDocVw.DWebBrowserEvents2.OnQuit    End Sub    Public Sub OnStatusBar(ByVal StatusBar As Boolean) Implements SHDocVw.DWebBrowserEvents2.OnStatusBar    End Sub    Public Sub OnTheaterMode(ByVal TheaterMode As Boolean) Implements SHDocVw.DWebBrowserEvents2.OnTheaterMode    End Sub    Public Sub OnToolBar(ByVal ToolBar As Boolean) Implements SHDocVw.DWebBrowserEvents2.OnToolBar    End Sub    Public Sub OnVisible(ByVal Visible As Boolean) Implements SHDocVw.DWebBrowserEvents2.OnVisible    End Sub    Public Sub PrintTemplateInstantiation(ByVal pDisp As Object) Implements SHDocVw.DWebBrowserEvents2.PrintTemplateInstantiation    End Sub    Public Sub PrintTemplateTeardown(ByVal pDisp As Object) Implements SHDocVw.DWebBrowserEvents2.PrintTemplateTeardown    End Sub    Public Sub PrivacyImpactedStateChange(ByVal bImpacted As Boolean) Implements SHDocVw.DWebBrowserEvents2.PrivacyImpactedStateChange    End Sub    Public Sub ProgressChange(ByVal Progress As Integer, ByVal ProgressMax As Integer) Implements SHDocVw.DWebBrowserEvents2.ProgressChange    End Sub    Public Sub PropertyChange(ByVal szProperty As String) Implements SHDocVw.DWebBrowserEvents2.PropertyChange    End Sub    Public Sub SetSecureLockIcon(ByVal SecureLockIcon As Integer) Implements SHDocVw.DWebBrowserEvents2.SetSecureLockIcon    End Sub    Public Sub StatusTextChange(ByVal Text As String) Implements SHDocVw.DWebBrowserEvents2.StatusTextChange    End Sub    Public Sub TitleChange(ByVal Text As String) Implements SHDocVw.DWebBrowserEvents2.TitleChange    End Sub    Public Sub UpdatePageStatus(ByVal pDisp As Object, ByRef nPage As Object, ByRef fDone As Object) Implements SHDocVw.DWebBrowserEvents2.UpdatePageStatus    End Sub    Public Sub WindowClosing(ByVal IsChildWindow As Boolean, ByRef Cancel As Boolean) Implements SHDocVw.DWebBrowserEvents2.WindowClosing    End Sub    Public Sub WindowSetHeight(ByVal Height As Integer) Implements SHDocVw.DWebBrowserEvents2.WindowSetHeight    End Sub    Public Sub WindowSetLeft(ByVal Left As Integer) Implements SHDocVw.DWebBrowserEvents2.WindowSetLeft    End Sub    Public Sub WindowSetResizable(ByVal Resizable As Boolean) Implements SHDocVw.DWebBrowserEvents2.WindowSetResizable    End Sub    Public Sub WindowSetTop(ByVal Top As Integer) Implements SHDocVw.DWebBrowserEvents2.WindowSetTop    End Sub    Public Sub WindowSetWidth(ByVal Width As Integer) Implements SHDocVw.DWebBrowserEvents2.WindowSetWidth    End SubEnd Class
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額外的備忘稿

  • 如果您將自動化 Internet Explorer 這個處理程序都是一樣的。取代 AxWebBrowser1 Internet Explorer 您本機變數名稱。
  • 這個範例並不會考慮框架組。當您瀏覽到一個框架組時,您可能不在您的應用程式中會看到任何事件。在您的應用程式中必要時您必須加入程式碼來處理框架組的可能性。
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参考
如 WebBrowser] 控制項,以及方法的相關資訊,請將屬性及事件 WebBrowser 控制項公開,參閱下列 MSDN 文件: 如需有關 Microsoft Internet Explorer 開發 Web 為基礎的解決方案的詳細資訊,請造訪下列 Microsoft 網站:back to the top
網頁瀏覽器

警告:本文為自動翻譯

內容

文章識別碼:311284 - 最後檢閱時間:12/07/2015 08:05:19 - 修訂: 3.1

Microsoft Visual Basic .NET 2002 Standard Edition, Microsoft Visual Basic .NET 2003 Standard Edition

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