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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>