Question

我只是在问这个问题之前四处搜索，在C＃中查找TCP服务器和客户端的示例。

我找到this链接，我只是通过链接使用了给定的代码，但不幸的是有问题而且我已经存货了！

以下代码是Server（控制台）的完整代码

function parent(val) {
    val.someProp = "abc";
    val(val);
}

parent(function(val){
    console.log(val.someProp);
});

以下代码是客户端的完整代码（Windows窗体）：

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

namespace TCP_Server_Console
{
    class Program
    {
        static void Main(string[] args)
        {
            TcpListener serverSocket = new TcpListener(8888);
            int requestCount = 0;
            TcpClient clientSocket = default(TcpClient);
            serverSocket.Start();
            Console.WriteLine(" >> Server Started");
            clientSocket = serverSocket.AcceptTcpClient();
            Console.WriteLine(" >> Accept connection from client");
            requestCount = 0;
            while ((true))
            {
                try
                {
                    requestCount = requestCount + 1;
                    NetworkStream networkStream = clientSocket.GetStream();
                    byte[] bytesFrom = new byte[10025];
                    networkStream.Read(bytesFrom, 0, (int)clientSocket.ReceiveBufferSize);
                    string dataFromClient = System.Text.Encoding.ASCII.GetString(bytesFrom);
                    dataFromClient = dataFromClient.Substring(0, dataFromClient.IndexOf("$"));
                    Console.WriteLine(" >> Data from client - " + dataFromClient);
                    string serverResponse = "Last Message from client" + dataFromClient;
                    Byte[] sendBytes = Encoding.ASCII.GetBytes(serverResponse);
                    networkStream.Write(sendBytes, 0, sendBytes.Length);
                    networkStream.Flush();
                    Console.WriteLine(" >> " + serverResponse);
                }
                catch (Exception ex)
                {
                    Console.WriteLine(ex.ToString());
                }
            }
            clientSocket.Close();
            serverSocket.Stop();
            Console.WriteLine(" >> exit");
            Console.ReadLine();
        }
    }
}


/*HandleClient Class */
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace TCP_Server_Console
{
    public class HandleClient
    {
        TcpClient clientSocket;
        string clNo;
        public void startClient(TcpClient inClientSocket, string clineNo)
        {
            this.clientSocket = inClientSocket;
            this.clNo = clineNo;
            Thread ctThread = new Thread(doChat);
            ctThread.Start();
        }

        private void doChat()
        {
            int requestCount = 0;
            byte[] bytesFrom = new byte[10025];
            string dataFromClient = null;
            Byte[] sendBytes = null;
            string serverResponse = null;
            string rCount = null;
            requestCount = 0;
            while ((true))
            {
                try
                {
                    requestCount = requestCount + 1;
                    NetworkStream networkStream = clientSocket.GetStream();
                    networkStream.Read(bytesFrom, 0, (int)clientSocket.ReceiveBufferSize);
                    dataFromClient = System.Text.Encoding.ASCII.GetString(bytesFrom);
                    dataFromClient = dataFromClient.Substring(0, dataFromClient.IndexOf("$"));
                    Console.WriteLine(" >> " + "From client-" + clNo + dataFromClient);
                    rCount = Convert.ToString(requestCount);
                    serverResponse = "Server to clinet(" + clNo + ") " + rCount;
                    sendBytes = Encoding.ASCII.GetBytes(serverResponse);
                    networkStream.Write(sendBytes, 0, sendBytes.Length);
                    networkStream.Flush();
                    Console.WriteLine(" >> " + serverResponse);
                }
                catch (Exception ex)
                {
                    Console.WriteLine(" >> " + ex.ToString());
                }
            }
        }
    }
}

每次我执行服务器代码时，它都可以工作并启动。但是当我执行客户端时，服务器会给我一个异常错误“using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Net.Sockets; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; namespace TCP_Client_Sample { public partial class Form1 : Form { System.Net.Sockets.TcpClient clientSocket = new System.Net.Sockets.TcpClient(); NetworkStream serverStream; public Form1() { InitializeComponent(); } private void Form1_Load(object sender, EventArgs e) { label_status.Text = "Client Started, Connecting..."; try { clientSocket.Connect("127.0.0.1", 8888); if (clientSocket.Connected) { label_status.Text = "Connected"; label_status.ForeColor = Color.Green; } } catch (Exception xe) { MessageBox.Show("OOPS!!! SERVER MUST BE STARTED FIRST! \n\n" + xe.ToString()); } } //Function to Send Message to Server (On Button Click) private void btn_send_Click(object sender, EventArgs e) { try { NetworkStream serverStream = clientSocket.GetStream(); byte[] outStream = System.Text.Encoding.ASCII.GetBytes("Message From Client$"); serverStream.Write(outStream, 0, outStream.Length); serverStream.Flush(); byte[] inStream = new byte[10025]; serverStream.Read(inStream, 0, (int)clientSocket.ReceiveBufferSize); string returnData = System.Text.Encoding.ASCII.GetString(inStream); chatBox.AppendText(">> Server: " + returnData); } catch (Exception ex) { MessageBox.Show("Unable to Send Data: " + ex); } } } }”。

以下是完整的例外错误：

Specified Argument was out of the range

每次点击客户端表单中的System.ArgumentOutOfRangeException: Specified argument was out of the range of valid values. Parameter name: size at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size) at TCP_Server_Console.Program.Main(String[] args) in C:\Users\user\Documents\Visual Studio 2015\Projects\TCP_Server_Console\TCP_Server_Console\Program.cs:line 50时，我也会收到相同的错误。

我在这里存货，我不知道是什么问题，因为这是我第一次使用TCP Socket。

Anynone可以帮助我吗？

Answer 1

问题在于您的代码使用了两种不同的大小

byte[] inStream = new byte[10025];
serverStream.Read(inStream, 0, (int)clientSocket.ReceiveBufferSize);

在此。你保留了10025字节的空间，但是RecieveBufferSize可能是另一个尺寸，更大或更小，但如果更大，它将会出错。

如果您使读取调用的调用长度与字节数组相同，则不会出现问题。

多线程TCP服务器和客户端

1 个答案: