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你可以使用WMI来获取MAC ID。。加上一些特定的条件也可以实现获取WLAN MAC_ID
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发送接收的过程都放在Try...Catch里面，一旦连接中断，就会出错，此时可以关闭现有连接，重新连服务端
就可以了，我有一段不太成熟的代码：
Imports System.Net
Imports System.Net.Sockets
Imports System.Threading
Imports System.IO
Public Class Form1
Dim TCPListenerRun, TCPClientRun As Boolean
Dim ControlTCPClient, ServerClient As TcpClient
Dim ControlTCPListener As TcpListener
Dim TCPClientT, TCPListenerT As Thread
Private ControlStream, SControlStream As NetworkStream
Private ControlReadStream, SControlReadStream As StreamReader
Private ControlWriteStream, SControlWriteStream As StreamWriter
'异步委托
Private Delegate Sub InvokeDelegate(ByVal iMessage As String)
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Try
If TCPListenerRun Then
TCPListenerT.Abort()
ControlTCPListener.Stop()
TCPListenerRun = False
Button1.Text = "启动服务端 "
TextBox2.AppendText( "服务器已停止！ " vbCrLf)
Else
ControlTCPListener = New TcpListener(IPAddress.Parse( "127.0.0.1 "), 13000)
ControlTCPListener.Start()
TCPListenerT = New Thread(AddressOf Listen)
TCPListenerT.Start()
TextBox2.AppendText( "等待连接... " vbCrLf)
TextBox2.AppendText( "服务器已启动！ " vbCrLf)
TCPListenerRun = True
Button1.Text = "停止服务端 "
End If
Catch ex As Exception
TextBox2.AppendText(ex.Message vbCrLf)
End Try
End Sub
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
Try
If TCPClientRun Then
TCPClientT.Abort()
ControlTCPClient.Close()
TCPClientRun = False
Button2.Text = "启动客户端 "
Else
ControlTCPClient = New TcpClient(New IPEndPoint(IPAddress.Parse( "127.0.0.1 "), 13001))
ControlTCPClient.Connect(New IPEndPoint(IPAddress.Parse( "127.0.0.1 "), 13000))
TCPClientRun = True
Button2.Text = "停止客户端 "
TCPClientT = New Thread(AddressOf Receive)
TCPClientT.Start()
ControlStream = ControlTCPClient.GetStream()
ControlReadStream = New StreamReader(ControlStream)
ControlWriteStream = New StreamWriter(ControlStream)
End If
Catch ex As SocketException
'If ex.ErrorCode = 10048 Then
ControlTCPClient.Close()
'End If
TCPClientRun = False
Button2.Text = "启动客户端 "
TextBox2.AppendText(ex.Message vbCrLf)
End Try
End Sub
Private Sub Listen()
ServerClient = ControlTCPListener.AcceptTcpClient
TextBox2.BeginInvoke(New InvokeDelegate(AddressOf InvokeMethod_Receive), "成功连接... ")
SControlStream = ServerClient.GetStream()
SControlReadStream = New StreamReader(SControlStream)
SControlWriteStream = New StreamWriter(SControlStream)
While True
TextBox2.BeginInvoke(New InvokeDelegate(AddressOf InvokeMethod_Receive), SControlReadStream.ReadLine())
End While
End Sub
Private Sub Receive()
While True
TextBox2.BeginInvoke(New InvokeDelegate(AddressOf InvokeMethod_Receive), ControlReadStream.ReadLine())
'Console.WriteLine(ControlTCPClient.Available)
End While
End Sub
Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
TCPListenerRun = False
TCPClientRun = False
End Sub
Private Sub InvokeMethod_Receive(ByVal iMessage As String)
TextBox2.AppendText(iMessage vbCrLf)
End Sub
Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
ControlWriteStream.WriteLine(TextBox1.Text)
ControlWriteStream.Flush()
End Sub
Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click
SControlWriteStream.WriteLine(TextBox3.Text)
SControlWriteStream.Flush()
End Sub
End Class