本文的重點在於幫助交易員拆解 XML 取得 RSS 股市新聞標題, 取得新聞標題最大的用意在於預警, 可避免投資標的物暴漲或暴跌, 甚至搶得投資先機 !

簡單的說, RSS 顯示出的網頁會是以 XML 為基礎的文字檔案, 自行拆解比使用一般市面上的 RSS Reader 閱讀器最大優點在於自己可以掌握主動通知, 可以容易的結合自行開發的程式, 亦可以定義自己需要的【關鍵字】提醒 !

首先, 我們先用 WebBrowser1.DocumentType.ToString() = "XML Document" 來驗證是否為 XML 格式, 再使用 Net.WebClient 的 DownloadData 將 XML 全部抓回來處理, 最後, 並將每個節點資訊拆開即可 !

Private Sub WebBrowser1_DocumentCompleted(ByVal sender As Object, ByVal e As System.Windows.Forms.WebBrowserDocumentCompletedEventArgs) Handles WebBrowser1.DocumentCompleted
    Try
        If WebBrowser1.DocumentType.ToString() = "XML Document" Then
            '下載 XML
            Dim myWebClient As New Net.WebClient
            Dim myByte() As Byte
            Dim strXML As String = ""
            myByte = myWebClient.DownloadData(TextBox1.Text.ToString())
            Select Case TextBox2.Text.Trim.ToUpper()
                Case "UTF-8".Trim.ToUpper()
                    strXML = Encoding.UTF8.GetString(myByte, 0, myByte.Length)
                Case "UTF-16".Trim.ToUpper()
                    strXML = Encoding.Unicode.GetString(myByte, 0, myByte.Length)
                Case "UTF-32".Trim.ToUpper()
                    strXML = Encoding.UTF32.GetString(myByte, 0, myByte.Length)
                Case "ASCII".Trim.ToUpper()
                    strXML = Encoding.ASCII.GetString(myByte, 0, myByte.Length)
                Case Else
                    If TextBox2.Text.Trim.Length > 0 Then
                        Try
                            myByte = Encoding.Convert(Encoding.Default, Encoding.GetEncoding(TextBox2.Text.Trim), myByte)
                            strXML = Encoding.Default.GetString(myByte, 0, myByte.Length)
                        Catch exErr As Exception
                            strXML = ""
                        End Try
                    Else
                        strXML = ""
                    End If
            End Select
            '拆解 XML
            Dim strNode() As String
            strNode = Split(strXML, "")
            '讀取節點
            If strNode.Length > 1 Then
                Dim iIndex As Integer = 0
                For iIndex = strNode.Length - 2 To 0 Step -1
                    If iIndex = 0 Then
                        If InStr(strNode(0), " 0 Then
                            Dim strTmp() As String
                            strTmp = Split(strNode(0), "                            strNode(0) = strTmp(strTmp.Length - 1)
                        Else
                            strNode(0) = ""
                        End If
                    End If
                    Dim strAddTitle As String = ""
                    Dim strAddUrl As String = ""
                    Dim strAddTime As String = ""
                    '抓取