如何建立TCP客户端服务器连接 [英] How to make TCP client server connection

问题描述

我创建了客户端（Windows）和服务器（控制台......并尝试在这两者之间建立连接并从客户端向服务器发送消息。



以下是错误：

I created Client(Windows) and Server(Console...and trying to make connection between these two and send message from client to server.

The following is the Error:

InvalidOperationException was unhandled.
An unhandled exception of type 'System.InvalidOperationException' occurred in System.dll

发生了，发生了System =InvalidOperationException'

我尝试了什么：



服务器：

What I have tried:

Server:

static void Main(string[] args)
        {
            TcpListener serverSocket = new TcpListener(8281);
            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();

        }

客户：

Client:

    public partial class Form1 : Form
    {
        System.Net.Sockets.TcpClient clientSocket = new System.Net.Sockets.TcpClient();

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            msg("Client Started");
            clientSocket.Connect("127.0.0.1", 8281);
            label1.Text = "Client Socket Program - Server Connected ...";
        }


        public void msg(string mesg)
        {
            textBox1.Text = textBox1.Text + Environment.NewLine + " >> " + mesg;
        }

        private void button1_Click_1(object sender, EventArgs e)
        {
            NetworkStream serverStream = clientSocket.GetStream();
            byte[] outStream = System.Text.Encoding.ASCII.GetBytes(textBox2.Text + "$");
            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);
            msg(returndata);
            textBox2.Text = "";
            textBox2.Focus();
        }
}

推荐答案

））;
Console.WriteLine（ >>来自客户的数据 - + dataFromClient）;
string serverResponse = 来自客户端的最后消息 + dataFromClient;
字节 [] sendBytes = Encoding.ASCII.GetBytes（serverResponse）;
networkStream.Write（sendBytes， 0 ，sendBytes.Length）;
networkStream.Flush（）;
Console.WriteLine（ >> + serverResponse）;
}
catch （例外情况）
{
Console.WriteLine（ex.ToString（））;
}
}

clientSocket.Close（）;
serverSocket.Stop（）;
Console.WriteLine（ >>退出）;
Console.ReadLine（）;

}

")); 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(); }

客户：

Client:

    public partial class Form1 : Form
    {
        System.Net.Sockets.TcpClient clientSocket = new System.Net.Sockets.TcpClient();

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            msg("Client Started");
            clientSocket.Connect("127.0.0.1", 8281);
            label1.Text = "Client Socket Program - Server Connected ...";
        }


        public void msg(string mesg)
        {
            textBox1.Text = textBox1.Text + Environment.NewLine + " >> " + mesg;
        }

        private void button1_Click_1(object sender, EventArgs e)
        {
            NetworkStream serverStream = clientSocket.GetStream();
            byte[] outStream = System.Text.Encoding.ASCII.GetBytes(textBox2.Text + "

）;
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）;
msg（returndata）;
textBox2.Text = ;
textBox2.Focus（）;
}
}

"); 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); msg(returndata); textBox2.Text = ""; textBox2.Focus(); } }

MSDN上有一些很好的入门示例。

< a href =https://msdn.microsoft.com/en-us/library/w89fhyex(v=vs.110).aspx>套接字代码示例 [ ^ ]



你最好先看看那里，忘记你到目前为止所编写的代码。

特别是在异步服务器套接字示例。

（这就是谢尔盖所说的）

客户可以是或者，根据您的需要。

There are some good "getting-started" examples on MSDN.
Socket Code Examples[^]

It is better that you start looking there and kind of forget about the code you have written so far.
Especially look in the the Asynchronous Server Socket Example.
(This is what Sergey is talking about)
The client can be either or, depending on your needs.

这篇关于如何建立TCP客户端服务器连接的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！