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+---
+title: WebSocket Server Vb.NET
+slug: Web/API/WebSockets_API/WebSocket_Server_Vb.NET
+translation_of: Web/API/WebSockets_API/WebSocket_Server_Vb.NET
+---
+<p>{{gecko_minversion_header("2")}}{{draft}}</p>
+
+<p>下面的示例没有优化。没有使用 .NET 4.5 Websocket。<br>
+ <br>
+ 当前版本：</p>
+
+<ul>
+ <li>包含了一个System.Net.Sockets.TcpClient类的泛型集合</li>
+ <li>特性 - 自定义事件和委托处理程序</li>
+ <li>特性 -  线程化和实现Timers.Timer</li>
+ <li>演示如何使用网络流将帧写回客户机(opCode 0001)</li>
+ <li>是否打算作为本教程和其他贡献者的起点</li>
+</ul>
+
+<p> </p>
+
+<pre>Imports System.Net.Sockets
+Imports System.Net
+Imports System
+Imports System.Text
+Imports System.Text.RegularExpressions
+
+
+Namespace TypeDef.WebSocket
+
+    Public Class Client
+        Dim _TcpClient As System.Net.Sockets.TcpClient
+
+        Public Delegate Sub OnClientDisconnectDelegateHandler()
+        Public Event onClientDisconnect As OnClientDisconnectDelegateHandler
+
+
+        Sub New(ByVal tcpClient As System.Net.Sockets.TcpClient)
+            Me._TcpClient = tcpClient
+        End Sub
+
+
+        Function isConnected() As Boolean
+            Return Me._TcpClient.Connected
+        End Function
+
+
+        Sub HandShake()
+            Dim stream As NetworkStream = Me._TcpClient.GetStream()
+            Dim bytes As Byte()
+            Dim data As String
+
+            While Me._TcpClient.Connected
+                While (stream.DataAvailable)
+                    ReDim bytes(Me._TcpClient.Client.Available)
+                    stream.Read(bytes, 0, bytes.Length)
+                    data = System.Text.Encoding.UTF8.GetString(bytes)
+
+                    If (New System.Text.RegularExpressions.Regex("^GET").IsMatch(data)) Then
+
+                        Dim response As Byte() = System.Text.Encoding.UTF8.GetBytes("HTTP/1.1 101 Switching Protocols" &amp; Environment.NewLine &amp; "Connection: Upgrade" &amp; Environment.NewLine &amp; "Upgrade: websocket" &amp; Environment.NewLine &amp; "Sec-WebSocket-Accept: " &amp; Convert.ToBase64String(System.Security.Cryptography.SHA1.Create().ComputeHash(Encoding.UTF8.GetBytes(New Regex("Sec-WebSocket-Key: (.*)").Match(data).Groups(1).Value.Trim() &amp; "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"))) &amp; Environment.NewLine &amp; Environment.NewLine)
+
+                        stream.Write(response, 0, response.Length)
+                        Exit Sub
+                    Else
+                        'We're going to disconnect the client here, because he's not handshacking properly (or at least to the scope of this code sample)
+                        Me._TcpClient.Close() 'The next While Me._TcpClient.Connected Loop Check should fail.. and raise the onClientDisconnect Event Thereafter
+                    End If
+                End While
+            End While
+            RaiseEvent onClientDisconnect()
+        End Sub
+
+
+        Sub CheckForDataAvailability()
+            If (Me._TcpClient.GetStream().DataAvailable) Then
+                Dim stream As NetworkStream = Me._TcpClient.GetStream()
+                Dim frameCount = 2
+                Dim bytes As Byte()
+                Dim data As String
+                ReDim bytes(Me._TcpClient.Client.Available)
+                stream.Read(bytes, 0, bytes.Length) 'Read the stream, don't close it..
+
+                Try
+                    Dim length As UInteger = bytes(1) - 128 'this should obviously be a byte (unsigned 8bit value)
+
+                    If length &gt; -1 Then
+                        If length = 126 Then
+                            length = 4
+                        ElseIf length = 127 Then
+                            length = 10
+                        End If
+                    End If
+
+                    'the following is very inefficient and likely unnecessary..
+                    'the main purpose is to just get the lower 4 bits of byte(0) - which is the OPCODE
+
+                    Dim value As Integer = bytes(0)
+                    Dim bitArray As BitArray = New BitArray(8)
+
+                    For c As Integer = 0 To 7 Step 1
+                        If value - (2 ^ (7 - c)) &gt;= 0 Then
+                            bitArray.Item(c) = True
+                            value -= (2 ^ (7 - c))
+                        Else
+                            bitArray.Item(c) = False
+                        End If
+                    Next
+
+
+                    Dim FRRR_OPCODE As String = ""
+
+                    For Each bit As Boolean In bitArray
+                        If bit Then
+                            FRRR_OPCODE &amp;= "1"
+                        Else
+                            FRRR_OPCODE &amp;= "0"
+                        End If
+                    Next
+
+
+                    Dim FIN As Integer = FRRR_OPCODE.Substring(0, 1)
+                    Dim RSV1 As Integer = FRRR_OPCODE.Substring(1, 1)
+                    Dim RSV2 As Integer = FRRR_OPCODE.Substring(2, 1)
+                    Dim RSV3 As Integer = FRRR_OPCODE.Substring(3, 1)
+                    Dim opCode As Integer = Convert.ToInt32(FRRR_OPCODE.Substring(4, 4), 2)
+
+
+
+                    Dim decoded(bytes.Length - (frameCount + 4)) As Byte
+                    Dim key As Byte() = {bytes(frameCount), bytes(frameCount+1), bytes(frameCount+2), bytes(frameCount+3)}
+
+                    Dim j As Integer = 0
+                    For i As Integer = (frameCount + 4) To (bytes.Length - 2) Step 1
+                        decoded(j) = Convert.ToByte((bytes(i) Xor masks(j Mod 4)))
+                        j += 1
+                    Next
+
+
+
+                    Select Case opCode
+                        Case Is = 1
+                            'Text Data Sent From Client
+
+                            data = System.Text.Encoding.UTF8.GetString(decoded)
+                            'handle this data
+
+                            Dim Payload As Byte() = System.Text.Encoding.UTF8.GetBytes("Text Recieved")
+                            Dim FRRROPCODE As Byte() = Convert.ToByte("10000001", 2) 'FIN is set, and OPCODE is 1 or Text
+                            Dim header as byte() = {FRRROPCODE, Convert.ToByte(Payload.Length)}
+
+
+                            Dim ResponseData As Byte()
+                            ReDim ResponseData((header.length + Payload.Length) - 1)
+                            'NOTEWORTHY: if you Redim ResponseData(header.length + Payload.Length).. you'll add a 0 value byte at the end of the response data..
+                            'which tells the client that your next stream write will be a continuation frame..
+
+                            Dim index as integer = 0
+
+                            Buffer.BlockCopy(header, 0, ResponseData, index, header.length)
+                            index += header.length
+
+                            Buffer.BlockCopy(payload, 0, ResponseData, index, payload.length)
+                            index += payload.length
+                            stream.Write(ResponseData, 0, ResponseData.Length)
+                      Case Is = 2
+                            '// Binary Data Sent From Client
+                            data = System.Text.Encoding.UTF8.GetString(decoded)
+                            Dim response As Byte() = System.Text.Encoding.UTF8.GetBytes("Binary Recieved")
+                             stream.Write(response, 0, response.Length)
+                      Case Is = 9 '// Ping Sent From Client
+                      Case Is = 10 '// Pong Sent From Client
+                      Case Else '// Improper opCode.. disconnect the client
+                            _TcpClient.Close()
+                            RaiseEvent onClientDisconnect()
+                      End Select
+                Catch ex As Exception
+                    _TcpClient.Close()
+                    RaiseEvent onClientDisconnect()
+                End Try
+            End If
+        End Sub
+    End Class
+
+
+
+    Public Class Server
+        Inherits System.Net.Sockets.TcpListener
+
+        Delegate Sub OnClientConnectDelegate(ByVal sender As Object, ByRef Client As WebSocket.Client)
+        Event OnClientConnect As OnClientConnectDelegate
+
+
+        Dim WithEvents PendingCheckTimer As Timers.Timer = New Timers.Timer(500)
+        Dim WithEvents ClientDataAvailableTimer As Timers.Timer = New Timers.Timer(50)
+        Property ClientCollection As List(Of WebSocket.Client) = New List(Of WebSocket.Client)
+
+
+
+        Sub New(ByVal url As String, ByVal port As Integer)
+            MyBase.New(IPAddress.Parse(url), port)
+        End Sub
+
+
+        Sub startServer()
+            Me.Start()
+            PendingCheckTimer.Start()
+        End Sub
+
+
+
+        Sub Client_Connected(ByVal sender As Object, ByRef client As WebSocket.Client) Handles Me.OnClientConnect
+            Me.ClientCollection.Add(client)
+            AddHandler client.onClientDisconnect, AddressOf Client_Disconnected
+            client.HandShake()
+            ClientDataAvailableTimer.Start()
+        End Sub
+
+
+        Sub Client_Disconnected()
+
+        End Sub
+
+
+        Function isClientDisconnected(ByVal client As WebSocket.Client) As Boolean
+            isClientDisconnected = False
+            If Not client.isConnected Then
+                Return True
+            End If
+        End Function
+
+
+        Function isClientConnected(ByVal client As WebSocket.Client) As Boolean
+            isClientConnected = False
+            If client.isConnected Then
+                Return True
+            End If
+        End Function
+
+
+        Private Sub PendingCheckTimer_Elapsed(ByVal sender As Object, ByVal e As System.Timers.ElapsedEventArgs) Handles PendingCheckTimer.Elapsed
+            If Pending() Then
+                RaiseEvent OnClientConnect(Me, New CORE.TypeDef.WebSocket.Client(Me.AcceptTcpClient()))
+            End If
+        End Sub
+
+
+        Private Sub ClientDataAvailableTimer_Elapsed(ByVal sender As Object, ByVal e As System.Timers.ElapsedEventArgs) Handles ClientDataAvailableTimer.Elapsed
+            Me.ClientCollection.RemoveAll(AddressOf isClientDisconnected)
+            If Me.ClientCollection.Count &lt; 1 Then ClientDataAvailableTimer.Stop()
+
+            For Each Client As WebSocket.Client In Me.ClientCollection
+                Client.CheckForDataAvailability()
+            Next
+        End Sub
+    End Class
+End Namespace
+
+Sub Main()  'Program Entry point
+    Dim thread As System.Threading.Thread = New System.Threading.Thread(AddressOf StartWebSocketServer)
+    'Application.Add("WebSocketServerThread", thread) 'Global.asax - context.Application .. I left this part in for web application developers
+    thread.Start()
+End Sub
+
+Public Shared WebSocketServer As TypeDef.WebSocket.Server
+Public Shared Sub StartWebSocketServer()
+    WebSocketServer = New TypeDef.WebSocket.Server("127.0.0.1", 8000)
+    WebSocketServer.startServer()
+End Sub
+</pre>