vb.net 教程 12-4 msHtml 3

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相比之前学习的HtmlDocument类和HtmlElement类，mshtml还提供了网页元素更详细的分类，比如

IHTMLScriptElement :脚本元素

IHTMLStyleSheet ：样式表

IHTMLFormElement：表单元素

等等

这些不同的元素分类有着自己的特殊属性和方法。

获得脚本信息：

    Private Sub Button3_Click(sender As Object, e As EventArgs) Handles Button3.Click
        Dim doc As mshtml.IHTMLDocument
        doc = wbMain.Document.DomDocument
        Dim scrs As mshtml.IHTMLElementCollection = doc.scripts
        Dim scr As mshtml.IHTMLScriptElement

        For i As Integer = 0 To scrs.length - 1
            scr = CType(scrs.item(i), mshtml.IHTMLScriptElement)
            txtInfo.Text &= "htmlFor:" & scr.htmlFor & vbCrLf
            txtInfo.Text &= "event:" & scr.event & vbCrLf
            txtInfo.Text &= "src:" & scr.src & vbCrLf
            txtInfo.Text &= "text:" & scr.text & vbCrLf
            txtInfo.Text &= "type:" & scr.type & vbCrLf
            txtInfo.Text &= "====================" & vbCrLf
        Next

    End Sub

运行如下：

获得样式表信息：

    Private Sub Button4_Click(sender As Object, e As EventArgs) Handles Button4.Click
        Dim doc As mshtml.IHTMLDocument2
        doc = wbMain.Document.DomDocument
        Dim styles As mshtml.HTMLStyleSheetsCollection = doc.styleSheets
        Dim style As mshtml.IHTMLStyleSheet
        For i As Integer = 0 To styles.length - 1
            style = CType(styles.item(i), mshtml.IHTMLStyleSheet)
            txtInfo.Text &= "cssText:" & style.cssText & vbCrLf
            txtInfo.Text &= "href:" & style.href & vbCrLf
            txtInfo.Text &= "id:" & style.id & vbCrLf
            txtInfo.Text &= "title:" & style.title & vbCrLf
            txtInfo.Text &= "type:" & style.type & vbCrLf
            txtInfo.Text &= "====================" & vbCrLf
        Next

    End Sub

运行如下：

获得表单信息：

    Private Sub Button5_Click(sender As Object, e As EventArgs) Handles Button5.Click
        Dim doc As mshtml.HTMLDocument
        doc = wbMain.Document.DomDocument

        doc.sc
        Dim eles As mshtml.IHTMLElementCollection = doc.forms
        Dim frm As mshtml.IHTMLFormElement
        For i As Integer = 0 To eles.length - 1
            frm = CType(eles.item(i), mshtml.IHTMLFormElement)

            txtInfo.Text &= "action:" & frm.action & vbCrLf
            txtInfo.Text &= "encoding:" & frm.encoding & vbCrLf
            txtInfo.Text &= "method:" & frm.method & vbCrLf
            txtInfo.Text &= "name:" & frm.name & vbCrLf
            txtInfo.Text &= "target:" & frm.target & vbCrLf
            txtInfo.Text &= "====================" & vbCrLf
        Next
    End Sub

运行如下：

由于.net平台下C#和vb.NET很相似，本文也可以为C#爱好者提供参考。

学习更多vb.net知识，请参看 vb.net 教程 目录