C#学习教程:TCP / IP消息帧分享


TCP / IP消息帧

我已经建立了一个TCP / IP服务器/客户端,它是异步的,但它连接了消息。 我如何正确地在开始时添加标题,然后在最后使用字符串构建器来取消连接完整的消息。

服务器阅读消息:

Private Sub ReadCallback(ByVal result As IAsyncResult) Try allDone.Set() Dim success As Boolean = result.AsyncWaitHandle.WaitOne(500, True) If success Then Dim client As ServerClient = TryCast(result.AsyncState, ServerClient) If client Is Nothing Then Return End If Dim networkStream As NetworkStream = client.NetworkStream Dim read As Integer = networkStream.EndRead(result) If read = 0 Then SyncLock Me.Clients Me.Clients.Remove(client.ClientID) Return End SyncLock End If If client.NetworkStream.CanRead Then dataString.Append(Me.Encoding.GetString(client.buffer, 0, read)) networkStream.BeginRead(client.buffer, 0, client.buffer.Length, AddressOf ReadCallback, client) allDone.WaitOne(500, True) End If End If Catch ex As IO.IOException Dim client As ServerClient = TryCast(result.AsyncState, ServerClient) SyncLock Me.Clients Me.Clients.Remove(client.ClientID) Return End SyncLock Catch ex As Exception If Not Me.tcpListener.Server.Connected Then Return End If End Try End Sub 

客户写信息:

  Public Function Write(value As String, encoding As Encoding) As Guid Dim buffer As Byte() = encoding.GetBytes(value) Return Me.Write(buffer) End Function Public Function Write(buffer As Byte()) As Guid Dim guid__1 As Guid = Guid.NewGuid() Dim networkStream As NetworkStream = Me.client.GetStream() Dim result As IAsyncResult = networkStream.BeginWrite(buffer, 0, buffer.Length, Nothing, guid__1) result.AsyncWaitHandle.WaitOne() networkStream.EndWrite(result) Return guid__1 End Function 

您需要在TCP / IP之上定义(可能很简单和简单)协议,以便您知道一条消息的开始和结束位置。 TCP / IP可以并将对您发送的消息进行分段,以便接收方可以获取消息,整个消息或多条消息的一部分。 一种简单的方法是编写消息长度,然后是消息。 接收器然后读入字节缓冲区,一旦接收到适当的字节数(基于发送的长度),就可以拉出消息并将其编码成字符串。

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