Question

我正在尝试构建一个简单的客户端服务器应用程序，其中服务器一直在监听，客户端可以发送消息。我使用http://brunov.info/blog/2013/02/09/tcpip-client-server-application-exchange-with-string-messages/作为参考。但是，当我在client.exe上的控制台上键入时，没有消息进入服务器并且程序挂起。我究竟做错了什么。请指教。

此致

这是我的Server.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Threading;

namespace ucSim1
{
    class Program
    {
        static void Main(string[] args)
        {
            var loaclAddress = IPAddress.Parse("127.0.0.1");
            var tcpListener = new TcpListener(loaclAddress, 81);
            tcpListener.Start();

            while (true)
            {
                Console.WriteLine("Waiting for a connection");

                var tcpClient = tcpListener.AcceptTcpClient();
                Console.WriteLine("Client Accepted");

                Thread thread = new Thread(() => ClientSession(tcpClient))
                {
                    IsBackground = true
                };

                thread.Start();
                Console.WriteLine( "Client Session thread started");

            }

        }

        private static bool tryRead(Stream stream, byte[] buffer, int offset, int count)
        {
            int bytesRead;
            while (count > 0 && (bytesRead = stream.Read(buffer, offset, count)) > 0)
            {
                offset += bytesRead;
                count -= bytesRead;
            }
            return count == 0;
        }



        private static void ClientSession(TcpClient tcpClient)
        {
            const int totalByteBuffer = 4096;
            byte[] buffer = new byte[256];

            using (var networkStream = tcpClient.GetStream())
            using (var bufferedStream = new BufferedStream(networkStream, totalByteBuffer))
                while (true)
                {
                    if (!tryRead(bufferedStream, buffer, 0, 1))
                    {
                        break;
                    }
                    byte messageLen = buffer[0];
                    if (!tryRead(bufferedStream, buffer, 1, messageLen))
                    {
                        break;
                    }
                    var message = Encoding.ASCII.GetString(buffer,1,messageLen);
                    Console.WriteLine("Message Recieved: {0}", message);

                }
        }
    }
}

这是Client.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Net;
using System.Net.Sockets;


namespace ucSim2
{
    class Program
    {
        private static byte[] msg2ByteArray(string message, Encoding enc)
        {
            var byteCount = enc.GetByteCount(message);
            if (byteCount > byte.MaxValue)
            {
                throw new ArgumentException("Message size is greater than 255 bytes in the provided encoding");
            }
            var byteArray = new byte[byteCount+1];
            byteArray[0] = (byte)byteCount;
            enc.GetBytes(message,0,message.Length,byteArray,1);
            return byteArray;
        }


        static void Main(string[] args)
        {
            String message;
            using (var tcpClient = new TcpClient())
            {
                tcpClient.Connect("127.0.0.1", 81);
                using (var networkStream = tcpClient.GetStream())
                using (var bufferedStream = new BufferedStream(networkStream))
                {
                    while (true)
                    {
                        byte[] buffer = new byte[256];
                        Console.WriteLine("Write Message");
                        message = Console.ReadLine();
                        var byteArray = msg2ByteArray(message, Encoding.ASCII);
                        bufferedStream.Write(byteArray, 0, byteArray.Length);
                    }

                }
            }
        }
    }
}

我在发布问题之后想出来...应该花更多时间才能开枪并发布问题... appologies

Answer 1

发送消息后，您应该拨打Flush() method：

bufferedStream.Write(byteArray, 0, byteArray.Length); 
bufferedStream.Flush(); // add this line

Answer 2

我不知道你想用BufferedStream做什么，但是当你在networkStream上写字时，它可以工作：

while (true)
{
    byte[] buffer = new byte[256];
    Console.WriteLine("Write Message");
    message = Console.ReadLine();
    var byteArray = msg2ByteArray(message, Encoding.ASCII);
    networkStream.Write(byteArray, 0, byteArray.Length);
}

和

if (!tryRead(networkStream, buffer, 0, 1))
{
    Console.WriteLine("No Message, process canceled.");
    break;
}
byte messageLen = buffer[0];
if (!tryRead(bufferedStream, buffer, 1, messageLen))
{
    Console.WriteLine("No Message, process canceled.");
    break;
}

C＃中的Simple Client Server应用程序

2 个答案: