Question

我正在尝试实现一个客户端服务器应用程序服务器程序有一个计数器，根据请求递增1（没有提供给客户端的计数器值可以复制）
客户端程序要求服务器程序递增计数器并获得递增值
服务器程序应该能够一次处理多个客户端（至少5个）计数器值应该由所有服务器线程共享，如果有的话

我已经在单独的项目中实现了服务器和客户端应用程序。当我开始运行服务器然后客户端时，服务器程序跟随行会产生NullReferanceException。

NetworkStream netstream = ((TcpClient)client).GetStream();

我是C＃的新手。我想知道客户端如何连接到服务器并获得递增的值。我在这里附上了我的代码。提前致谢。

MyServer.cs

public abstract class MyServer
    {

        private static int port = 8080;
        private static TcpListener listener;
        private static Thread thread;
        private static int clientId = 0;

        static void Main(string[] args)
        {

            listener = new TcpListener(new IPAddress(new byte[] {127,0,0,1}),port);
            thread = new Thread(new ThreadStart(Listen));
            thread.Start();
        }


        private static void Listen()
        {
            listener.Start();
            Console.WriteLine("Listening on: " + port.ToString());

            while(true)
            {
                Console.WriteLine("Waiting for connection....");
                Console.WriteLine("Client No: " + clientId);
                TcpClient client = listener.AcceptTcpClient();
                Thread listenThread = new Thread(new ParameterizedThreadStart(ListenThread));
                listenThread.Start();
            }
        }

        private static void ListenThread(Object client)
        {

                NetworkStream netstream = ((TcpClient)client).GetStream();
                Console.WriteLine("Request made");
                clientId = clientId + 1;
                // String message = "Hello world";
                byte[] resMessage = Encoding.ASCII.GetBytes(clientId.ToString());
                netstream.Write(resMessage, 0, resMessage.Length);
                netstream.Close();


        }
    }

MyClient.cs

 class MyClient
    {
        static void Main(string[] args)
        {
            TcpClient tcpClient;
            int port = 8080;
            NetworkStream stream = null;

            tcpClient = new TcpClient("127.0.0.1", port);
            Console.WriteLine("Connection was established....");

            stream = tcpClient.GetStream();

            Byte[] response = new Byte[tcpClient.ReceiveBufferSize];
            stream.Read(response,0,(int)tcpClient.ReceiveBufferSize);

            String returnData = Encoding.UTF8.GetString(response);
            Console.WriteLine("Server Response " + returnData);

            tcpClient.Close();
            stream.Close();

        }
    }

Answer 1

你正在启动没有参数的线程，而它期望一个（客户端的TcpStream）。改变这个：

listenThread.Start();

到此：

listenThread.Start(client);

顺便说一句，我称之为clientThread而不是listenThread;线程没有收听，它正在关注客户端。

使用C＃实现TCP客户端服务器应用程序

1 个答案: