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   源码介绍

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Option Explicit On
Option Strict On
Imports System.ComponentModel
Imports System.Drawing
Imports System.Windows.Forms
Imports System.Threading
Imports System.Net.Sockets

Public Class Form1
    Inherits System.Windows.Forms.Form
    
    Private ActiveThreads() As Thread
    Private ActiveThreadsState() As Integer

    Public Sub New()
        MyBase.New()

        Form1 = Me

        '该调用是 Win 窗体设计器所必需的。
        InitializeComponent()

        'TODO：在 InitializeComponent() 调用之后添加任何初始化
    End Sub

    '窗体重写 dispose 以清理组件列表。
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If Disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(Disposing)
    End Sub

#Region " Windows 窗体设计器生成的代码 "

    'Windows 窗体设计器所必需
    Private components As System.ComponentModel.Container
    Private WithEvents lstOutput As System.Windows.Forms.ListBox
    Private WithEvents cmdStop As System.Windows.Forms.Button
    Private WithEvents Label1 As System.Windows.Forms.Label


    Private WithEvents txtClientCount As System.Windows.Forms.TextBox

    Private WithEvents cmdStart As System.Windows.Forms.Button

    Dim WithEvents Form1 As System.Windows.Forms.Form

    '注意：以下过程是 Windows 窗体设计器所必需的
    '可以使用 Windows 窗体设计器修改此过程。
    '不要使用代码编辑器修改它。
    Private Sub InitializeComponent()
        Me.components = New System.ComponentModel.Container()
        Me.txtClientCount = New System.Windows.Forms.TextBox()
        Me.cmdStop = New System.Windows.Forms.Button()
        Me.cmdStart = New System.Windows.Forms.Button()
        Me.lstOutput = New System.Windows.Forms.ListBox()
        Me.Label1 = New System.Windows.Forms.Label()

        '@design Me.TrayHeight = 0
        '@design Me.TrayLargeIcon = False
        '@design Me.TrayAutoArrange = True
        '@design Me.GridSize = New System.Drawing.Size(8, 8)
        txtClientCount.Location = New System.Drawing.Point(160, 8)
        txtClientCount.Text = "10"
        txtClientCount.TabIndex = 2
        txtClientCount.Size = New System.Drawing.Size(32, 20)

        cmdStop.Location = New System.Drawing.Point(208, 8)
        cmdStop.Size = New System.Drawing.Size(64, 24)
        cmdStop.TabIndex = 6
        cmdStop.Text = "停止"

        cmdStart.Location = New System.Drawing.Point(8, 8)
        cmdStart.Size = New System.Drawing.Size(64, 24)
        cmdStart.TabIndex = 0
        cmdStart.Text = "启动"

        lstOutput.Location = New System.Drawing.Point(8, 48)
        lstOutput.Size = New System.Drawing.Size(328, 225)
        lstOutput.TabIndex = 7

        Label1.Location = New System.Drawing.Point(80, 10)
        Label1.Text = "客户端计数:"
        Label1.Size = New System.Drawing.Size(72, 16)
        Label1.TabIndex = 5
        Label1.TextAlign = ContentAlignment.MiddleRight

        Me.Text = "客户端"
        Me.StartPosition = System.Windows.Forms.FormStartPosition.Manual
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(344, 285)

        Me.Controls.Add(lstOutput)
        Me.Controls.Add(cmdStop)
        Me.Controls.Add(Label1)
        Me.Controls.Add(txtClientCount)
        Me.Controls.Add(cmdStart)
    End Sub

#End Region

    Protected Sub cmdStop_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles cmdStop.Click

        Dim i As Integer

        For i = 0 To UBound(ActiveThreads)
            ActiveThreads(i).Abort()
            ActiveThreads(i) = Nothing
        Next

    End Sub

    Protected Sub cmdStart_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles cmdStart.Click

        Dim i As Integer
        Dim ClientCount As Integer
        Dim ActiveThreadStart As ThreadStart
        ClientCount = Int32.Parse(txtClientCount.Text)
        ReDim ActiveThreads(ClientCount - 1)
        ReDim ActiveThreadsState(ClientCount - 1)

        For i = 0 To ClientCount - 1
            '创建 ThreadStart 对象以传递 NewThread 的地址
            ActiveThreadStart = New ThreadStart(AddressOf StartClient)
            '清除任何现有线程（如果多次单击了“开始”按钮）
            ActiveThreads(i) = Nothing
            '创建 Thread 对象
            ActiveThreads(i) = New Thread(ActiveThreadStart)
            '启动线程将调用 ThreadStart 委托
            ActiveThreads(i).Name = i.ToString
            ActiveThreadsState(i) = System.Threading.ThreadState.Running

            ActiveThreads(i).Start()
        Next i

    End Sub

    Protected Sub StartClient()

        Dim NewThread As Thread
        Dim ThreadName As String
        Dim Client As TcpClient
        Dim Buffer() As Byte
        Dim InBuff(100) As Byte
        Dim Temp As String

        NewThread = System.Threading.Thread.CurrentThread
        ThreadName = NewThread.Name

        While True
            Client = New TcpClient()

            Try
                Client.Connect("localhost", 9105)
            Catch e As Exception
                SyncLock NewThread
                    lstOutput.Items.Insert(lstOutput.Items.Count, "与服务器的连接失败，返回代码是: " & e.Message)
                    lstOutput.SelectedIndex = lstOutput.Items.Count - 1
                End SyncLock

                Exit Sub
            End Try

            Temp = System.DateTime.Now & " 来自客户端 # 的消息" & ThreadName
            Buffer = System.Text.Encoding.Default.GetBytes(Temp.ToCharArray)

            Client.GetStream().Write(Buffer, 0, Buffer.Length)

            While Not Client.GetStream.DataAvailable()
                Application.DoEvents()
            End While

            If Client.GetStream.DataAvailable() Then
                Client.GetStream().Read(InBuff, 0, InBuff.Length)
                Temp = "客户端 #" & ThreadName & " " & System.Text.Encoding.Default.GetString(InBuff)
                SyncLock NewThread
                    lstOutput.Items.Insert(lstOutput.Items.Count, Temp)
                    lstOutput.SelectedIndex = lstOutput.Items.Count - 1
                End SyncLock
            End If

            Client.Close()
        End While

    End Sub

End Class