Senden von UDP-Daten, einschließlich hex mit VB.NET

Könnten Sie zusammen einen quickie decoder wie diese:

Function HexCodeToHexChar(ByVal m as System.Text.RegularExpressions.Match) As String
    Return Chr(Integer.Parse(m.Value.Substring("<0x".Length, 2), _
         Globalization.NumberStyles.HexNumber))
End Function

dann verwenden Sie diese zu transformieren:

Dim r As New System.Text.RegularExpressions.Regex("<0x[0-9a-fA-F]{2}>")
Dim s As String = r.Replace("abc<0x44>efg", AddressOf HexCodeToHexChar)
' s should now be "abcDefg"

könnte man auch einen encoder-Funktion, macht diese Decodierung (obwohl ein wenig komplizierter)

Function HexCharToHexCode(ByVal m As Match) As String
    If m.Value.StartsWith("<0x") And m.Value.EndsWith(">") And m.Value.Length = "<0x??>".Length Then
        Return "<0<0x78>" + m.Value.Substring("<0x".Length)
    ElseIf Asc(m.Value) >= 0 And Asc(m.Value) <= &HFF Then
        Return "<0x" + Right("0" + Hex(Asc(m.Value)), 2) + ">"
    Else
        Throw New ArgumentException("Non-SBCS ANSI characters not supported")
    End If
End Function

und verwenden Sie diese zu transformieren:

Dim r As New Regex("[^ -~]|<0x[0-9a-fA-F]{2}>")
Dim s As String = r.Replace("abc"+chr(4)+"efg", AddressOf HexCharToHexCode)
' s should now be "abc<0x04>efg"

oder Sie können einfach erstellen Sie die Zeichenfolge mit Sonderzeichen in es zu beginnen, wie diese:

Dim packet As String = Chr(&H01) + "Z30" + Chr(&H02) + "AA" + Chr(&H06) + _
    Chr(&H1B) + "0b" + Chr(&H1C) + "1" + Chr(&H1A) + _
    "1This message will show up on the screen" + Chr(&H04)

für das senden eines UDP-Pakets, das folgende sollte genügen:

Dim i As New IPEndPoint(IPAddress.Parse("192.168.0.5"), 3001) ''//Target IP:port
Dim u As New UdpClient()
Dim b As Byte() = Encoding.UTF8.GetBytes(s) ''//Where s is the decoded string
u.Send(b, b.Length, i)

InformationsquelleAutor Hafthor

Den UDP-client schickt ein array von bytes.

Sie könnte einen memory-stream und schreiben bytes in ein array.

Public Class MainClass
   Shared client As UdpClient
   Shared receivePoint As IPEndPoint


   Public Shared Sub Main()
      receivePoint = New IPEndPoint(New IPAddress(0), 0)
      client = New UdpClient(8888)
      Dim thread As Thread = New Thread(New ThreadStart(AddressOf WaitForPackets))
      thread.Start()


      Dim packet As Packet = New Packet("client")
      Console.WriteLine("Sending packet containing: ")
      Dim data As Byte() = packet.Data

      client.Send(data, data.Length, "localhost", 5000)
      Console.WriteLine("Packet sent")

   End Sub

   Public Shared Sub WaitForPackets()
      While True
         Dim data As Byte() = client.Receive(receivePoint)
         Console.WriteLine("Packet received:" & _
            vbCrLf & "Length: " & data.Length & vbCrLf & _
            System.Text.Encoding.ASCII.GetString(data))

      End While

   End Sub ' WaitForPackets  

End Class  

Public Class Packet  
   Private _message As String  

   Public Sub New(ByVal message As String)
      _message = message
   End Sub

   Public Function Data() As Byte()

      Dim ret(13 + _message.Length) As Byte

      Dim ms As New MemoryStream(ret, True)

      ms.WriteByte(&H1)

      '<0x01>Z30<0x02>AA<0x06><0x1B>0b<0x1C>1<0x1A>1This message will show up on the screen<0x04>  
      ms.Write(System.Text.Encoding.ASCII.GetBytes("Z30"), 0, 3)

      ms.WriteByte(&H2)

      ms.Write(System.Text.Encoding.ASCII.GetBytes("AA"), 0, 2)

      ms.WriteByte(&H6)

      ms.Write(System.Text.Encoding.ASCII.GetBytes("0b"), 0, 2)

      ms.WriteByte(&H1C)

      ms.Write(System.Text.Encoding.ASCII.GetBytes("1"), 0, 1)

      ms.WriteByte(&H1A)

      ms.Write(System.Text.Encoding.ASCII.GetBytes(_message), 0, _message.Length)

      ms.WriteByte(&H4)

      ms.Close()

      Data = ret
   End Function
End Class

InformationsquelleAutor Hamish Smith