用vb.net实现网络通信

用 vb.net socket通信

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Dim th As Threading.Thread

2 Dim tcpl As System.Net.Sockets.TcpListener

3

4 Private Sub Form1_Load()Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

5 th = New System.Threading.Thread(New System.Threading.ThreadStart(AddressOf MyListen))

6 th.Start()

7 End Sub

8

9 Public Sub SendMessage()Sub SendMessage(ByVal IP As String, ByVal SendMsg As String)

10 Try

11 If IP "" Then

12 Dim tcpc As New System.Net.Sockets.TcpClient(IP, 5656)

13 Dim tcpStream As Net.Sockets.NetworkStream = tcpc.GetStream

14 Dim reqStream As New IO.StreamWriter(tcpStream)

15 reqStream.Write(SendMsg)

16 reqStream.Flush()

17 tcpStream.Close()

18 tcpc.Close()

19 End If

20 Catch ex As Exception

21 MsgBox(ex.Message.ToString)

22 End Try

23 End Sub

24 Private Sub MyListen()Sub MyListen()

25 Try

26 Dim ipAddress As System.Net.IPAddress = System.Net.Dns.Resolve(System.Net.Dns.GetHostName).AddressList(0)

27 tcpl = New System.Net.Sockets.TcpListener(ipAddress, 5656)

28 tcpl.Start()

29 While True

30 Dim s As System.Net.Sockets.Socket = tcpl.AcceptSocket()

31 Dim MyBuffer(1024) As Byte

32 Dim i As Integer

33 i = s.Receive(MyBuffer)

34 If i 0 Then

35 Dim lstrRec As String

36 Dim j As Integer

37 For j = 0 To i - 1

38 TextBox1.Text += Chr(MyBuffer(j)) ","

39 Next

40 End If

41 End While

42 Catch ex As Exception

43 MsgBox(ex.Message.ToString)

44 End Try

45 End Sub

46

47 Private Sub Button1_Click()Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

48 SendMessage("192.168.0.61", TextBox2.Text)

49 End Sub

VB与VB.NET串口及以太网通迅

关于串口通讯的问题：

很明显，你还不知道（不会、不习惯）使用事件驱动的方式接收数据。

建议你仔细看看串口组件（无论VB6还是VB.net）的OnComm事件，你的问题很容易解决。

关于以太网通讯：

在TCP通讯中端口确实可以重用，你百度一下“TCP端口重用”能查到很多示例。

但绝大多数情况下不推荐端口重用，而应该采取服务器端建立连接池的方法。

或者，干脆不用TCP，用UDP解决也可以。

有关VB.NET socket通信断开后重连问题

这个很正常，因为服务器（对方）还没对客户端（本地）做Close动作。还有一个说法是本地端控件的缓存还存在着与服务器对应Handle，只是State属性状态不是sckConnected而已。继续进行测试，你也会发现只要超过60秒通信闲置，也会自动Not sckConnected。

TCP连线，可以使用Load 控件数组进行尝试连线，当控件Close后就Unload，这可以取代必须关闭窗体、重新打开连接的问题。

vb.net 做的通信程序，设备掉电后出错：无法从传输连接中读取数据: 远程主机强迫关闭了一个现有的连接

看下这个异常的类型 在捕捉异常的时候处理为关闭并重新打开端口监听（这个看你自己需求） 然后在socketException下面再catch其它exception 进行弹出错误提示之类的操作 就可以了

VB.NET 服务器与客户端数据交互问题？

客户端简单代码：

Imports System.Net.Sockets

Imports System.IO

Private Output As NetworkStream

Private Writer As BinaryWriter

Private Reader As BinaryReader

Dim StrSend As String

Dim client As New TcpClient '

client.Connect(servIP, 2006)

Output = client.GetStream

Writer = New BinaryWriter(Output)

Reader = New BinaryReader(Output)

StrSend = "字符串"

System.Threading.Thread.Sleep(100)

Writer.Write(StrSend)

Try

Message = Reader.ReadString

If Message = "OK" Then

LBinfo.Text = "成功！" '测试

Else

LBinfo.Text = "失败！"

End If

System.Threading.Thread.Sleep(100)

Catch ex As Exception

MessageBox.Show("Client Application Closing!")

Finally

Writer.Close()

Reader.Close()

Output.Close()

client.Close()

End Try

服务器端

用线程

Imports System.Net.Sockets

Imports System.IO

Imports System.Threading

Imports System.Windows.Forms

Private Connection As Socket

Private readThread As Thread

Private SocketStream As NetworkStream

Private Writer As BinaryWriter

Private Reader As BinaryReader

Public Sub New()

MyBase.New()

'该调用是 Windows 窗体设计器所必需的。

InitializeComponent()

'在 InitializeComponent() 调用之后添加任何初始化

readThread = New Thread(AddressOf RunServer)

readThread.Start()

End Sub

Public Sub RunServer()

Dim Listener As TcpListener

Try

Listener = New TcpListener(Net.IPAddress.Parse("192.168.1.16"), 2006)

Listener.Start()

While True

Connection = Listener.AcceptSocket 'accept an incoming connection

SocketStream = New NetworkStream(Connection) 'create networkstream object associated with socket

Writer = New BinaryWriter(SocketStream) 'create object for transferring data across stream

Reader = New BinaryReader(SocketStream) 'read string data sent from client

Try

Do

strIncept = Reader.ReadString

strIncept = DataDisp(strIncept) '此处插入数据处理程序()

SendInfoToClient(strIncept) 'send to client

Loop While Connection.Connected

Catch ex As Exception

MsgBox(ex.ToString)

Finally

Writer.Close()

Reader.Close()

SocketStream.Close()

End Try

End While

Catch ex As Exception

MsgBox(ex.ToString)

End Try

End Sub

Public Sub SendInfoToClient(ByVal Info As String)

'Send to client

Try

If Connection.Connected Then

Writer.Write(Info)

Connection.Close()

End If

Catch ex As SocketException

MessageBox.Show(ex.ToString)

End Try

End Sub

整个过程都有了

用VB.NET编程，实现一个客户端和一个服务器能连接并通讯，急啊

自学还是必要的

你去看看TcpServerChannel TcpClient类

msdn链接地址

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