C＃客戶端套接字多次發送和接收

我正在使用套接字進行TCP-IP連接，並且想從客戶端建立簡單的系統發送接收。C＃客戶端套接字多次發送和接收

Socket sck; 
     sck = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); 
     IPEndPoint localEndpt = new IPEndPoint(IPAddress.Parse("123.123.123.1"), 12345); 
     try 
     { 
      sck.Connect(localEndpt); 
     } 
     catch 
     { 
      Console.Write("Unable to Connect"); 
     } 
     while (true) 
     { 
      Console.WriteLine("Enter Text"); 
      string sendtext = Console.ReadLine(); 
      byte[] Data = Encoding.ASCII.GetBytes(sendtext); 
      sck.Send(Data); 
      Console.WriteLine("Data Sent!"); 

      byte[] bytesReceived = new byte[sck.ReceiveBufferSize]; 
      int bytes = 0; 
      String strReceived = ""; 

      int dataAvailable = 0; 
      while (dataAvailable == 0 || dataAvailable != sck.Available) 
      { 
       dataAvailable = sck.Available; 
       Thread.Sleep(100); // if no new data after 100ms assume transmission finished 
      } 

      if (sck.Available > 0) 
      { 
       bytes = sck.Receive(bytesReceived, bytesReceived.Length, 0); 
       strReceived+=Encoding.ASCII.GetString(bytesReceived, 0, bytes); 
      } 

      Console.WriteLine("Received from server: " + strReceived); 
     } 
     Console.Read();

的問題是，首先要求去throught但第二次卻不會，因爲插座已不存在（插座「速效」的屬性值是0）。我究竟做錯了什麼？（按順序）建立多個發送請求請求的最簡單方法是什麼？

來源

2017-04-20 michael24B

Socket. Available確實不表明插座是否可用，但傳入的數據可用於閱讀：
https://msdn.microsoft.com/en-us/library/ee425135.aspx

你的程序了發送消息後立即退出，因爲它會檢查答覆（輸入數據）。在檢查數據之前使用Thread.Sleep。

也許該消息還沒有被髮送，因爲Socket.Send只是將它放在網絡接口卡的輸出緩衝區中。當套接字最終發送消息時，它會調整連接狀態。如果它沒有回覆（在TCP連接上），它會告訴你，當你查詢狀態時，它被斷開。在UDP上，它會告訴你什麼，因爲UDP是無連接的。

來源

2017-04-30 06:58:50

此代碼工作正常，我

private List<Socket> _clients = new List<Socket>(); 
    private Thread _dataReceiveThread; 
    private bool _isConnected; 

    private void DataReceive() 
    { 
     while (_isConnected) 
     { 
      List<Socket> clients = new List<Socket>(_clients); 
      foreach (Socket client in clients) 
      { 
       try 
       { 
        if (!client.Connected) continue; 
        string txt = ""; 
        while (client.Available > 0) 
        { 
         byte[] bytes = new byte[client.ReceiveBufferSize]; 
         int byteRec = client.Receive(bytes); 
         if (byteRec > 0) 
          txt += Encoding.UTF8.GetString(bytes, 0, byteRec); 
        } 
        if (!string.IsNullOrEmpty(txt)) 
         /* Here you can access the text received in the "txt" */ 
       } 
       catch (Exception e) 
       { 
        Exception_Handler(e); 
       } 
      } 
     } 
    }

只需運行該代碼上手

_isConnected = true; 
_dataReceiveThread = new Thread(DataReceive); 
_dataReceiveThread.Start();

來源

2017-08-27 10:14:04

C＃客戶端套接字多次發送和接收

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