Module Module1
    Public s As SMS
    Sub Main()
        Do

            Console.WriteLine("Please Input PDU code(e to exit):")
            Dim PDUCode As String = Console.ReadLine()
            If UCase(PDUCode) = "E" Then Exit Do
            Dim T As SMS.SMSType = GetSMSType(PDUCode)
            Console.WriteLine(T.ToString)
            Select Case T
                Case SMS.SMSType.EMS_RECEIVED
                    s = New EMS_RECEIVED(PDUCode)
                Case SMS.SMSType.SMS_RECEIVED
                    s = New SMS_RECEIVED(PDUCode)
                Case SMS.SMSType.EMS_SUBMIT
                    s = New EMS_SUBMIT(PDUCode)
                Case SMS.SMSType.SMS_SUBMIT
                    s = New SMS_SUBMIT(PDUCode)
                Case SMS.SMSType.SMS_STATUS_REPORT
                    s = New SMS_STATUS_REPORT(PDUCode)
                Case Else
                    Stop
            End Select
            Console.WriteLine(s.UnicodeToGB(s.TP_UD))
        Loop
    End Sub


    Public Function GetSMSType(ByVal PDUCode As String) As SMS.SMSType
        '取得FirstOctet
        Dim FirstOctet As Byte
        Dim L As Integer = SMS.GetByte(PDUCode)
        SMS.GetByte(PDUCode)
        SMS.GetString(PDUCode, (L - 1) * 2)
        FirstOctet = SMS.GetByte(PDUCode)
        '取得特征碼
        '取得基本碼 最后兩個bit + 是否有header作為標記
        Dim t1 As Integer = FirstOctet And 3 '00000011
        Dim t2 As Integer = FirstOctet And 64 '01000000
        '特別處理
        If t1 = 3 And t2 = 64 Then Return SMS.SMSType.EMS_SUBMIT
        Return t1 + t2
    End Function

End Module