用vb.net實(shí)現(xiàn)網(wǎng)絡(luò)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.net從一臺(tái)主機(jī)通過socket同時(shí)向多臺(tái)主機(jī)傳送信息，如何操作？

用VB5 Winsock控件創(chuàng)建TCP/IP通訊程序 隨著Windows 95中文版和Windows NT Server 4.0中文版的流行， Microsoft公司推出了相應(yīng)平臺(tái)上的開發(fā)軟件: Visual Basic 5.0 中文企業(yè) 版。它為Windows環(huán)境下的網(wǎng)絡(luò)開發(fā)提供了強(qiáng)大的工具，Winsock控件就是其中之一。 Winsock控件建立在TCP、UDP協(xié)議的基礎(chǔ)上，完成與遠(yuǎn)程計(jì)算機(jī)的通信。即使對TCP/IP不太熟悉的用戶，使用該控件也可以在十幾分鐘內(nèi)創(chuàng)建一個(gè)簡單的客戶機(jī)/服務(wù)器程序。下面我們對Winsock控件的事件、方法、屬性按其在程序中出現(xiàn)的順序分別作詳細(xì)的介紹，以便更好地理解程序源代碼。

VB.NET 2003中 想做一個(gè)基于TCP/IP的網(wǎng)絡(luò)通信程序

就可以了，我有一段不太成熟的代碼：

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

'異步委托

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 = "啟動(dòng)服務(wù)端 "

TextBox2.AppendText( "服務(wù)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( "等待連接... " vbCrLf)

TextBox2.AppendText( "服務(wù)器已啟動(dòng)！ " vbCrLf)

TCPListenerRun = True

Button1.Text = "停止服務(wù)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 = "啟動(dòng)客戶端 "

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 = "停止客戶端 "

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 = "啟動(dòng)客戶端 "

TextBox2.AppendText(ex.Message vbCrLf)

End Try

End Sub

Private Sub Listen()

ServerClient = ControlTCPListener.AcceptTcpClient

TextBox2.BeginInvoke(New InvokeDelegate(AddressOf InvokeMethod_Receive), "成功連接... ")

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