如何从一个端口发送数据并从套接字编程c＃中接收另一个端口。 [英] How to Send data from one port and receive from another in socket programming c#.

问题描述

我需要创建客户端服务器应用程序，其中服务器侦听一个端口并在另一个端口上为同一客户端发送响应。我已经创建了这样的东西，这是行不通的，我想我甚至不在附近发送和接收不同的端口。虽然我已经为同一个端口实现了这一点。帮助高度赞赏。谢谢



服务器： -

I need to create client server application in which server listens on one port and sends response on another port for same client. I have created something like this which is not working and i guess i am not even near to send and receive on different port. Though i have achieved this for same port. Help highly Appreciated. Thanks

Server:-

public void createListener()
{

    TcpListener tcpListener = null;
    IPAddress ipAddress = IPAddress.Any;
    try
    {
        tcpListener = new TcpListener(ipAddress, 1818);
        tcpListener.Start();
        output = "Waiting for a connection...";
    }
    catch (Exception e)
    {
        output = "Error: " + e.ToString();
        MessageBox.Show(output);
    }
    while (true)
    {             
        Thread.Sleep(10);            
        TcpClient tcpClient = tcpListener.AcceptTcpClient();
        byte[] bytes = new byte[256];
        NetworkStream stream = tcpClient.GetStream();
        stream.Read(bytes, 0, bytes.Length);
        SocketHelper helper = new SocketHelper();
        helper.processMsg(tcpClient, stream, bytes);                
    }
}

class SocketHelper
{
    TcpClient mscClient;
    string mstrMessage;
    string mstrResponse;
    byte[] bytesSent;
   
    public void processMsg(TcpClient client, NetworkStream stream, byte[] bytesReceived)
    {
        mstrMessage = Encoding.ASCII.GetString(bytesReceived, 0, bytesReceived.Length);
        mscClient = client;
        if (mstrMessage.Length>0)
        {
            mstrResponse = mstrMessage;
        }
        else
        {
            mstrResponse = "You have sent blank message";
        }
        bytesSent = Encoding.ASCII.GetBytes(mstrResponse);
        stream.Write(bytesSent, 0, bytesSent.Length);
    }
   
}
      
private void button1_Click(object sender, EventArgs e)
{
    button1.Text = "Now Listening";
    this.createListener();
}

客户： -

Client:--

static string output = "";
public Client()
{
    InitializeComponent();
}
public void createListener()
{

    TcpListener tcpListener = null;

    IPAddress ipAddress = IPAddress.Any;
    try
    {

        tcpListener = new TcpListener(ipAddress, 1819);
        tcpListener.Start();
        output = "Waiting for a connection...";
    }
    catch (Exception e)
    {
        output = "Error: " + e.ToString();
        MessageBox.Show(output);
    }
    while (true)
    {
        Thread.Sleep(10);
        TcpClient tcpClient = tcpListener.AcceptTcpClient();
        byte[] bytes = new byte[256];
        NetworkStream stream = tcpClient.GetStream();                
        stream.Read(bytes, 0, bytes.Length);
        string output = "";
    }
}
static string Connect(string serverIP, string message)
{
    string output = "";

    try
    {

        Int32 port = 1818;
        TcpClient client = new TcpClient(serverIP, port);

        Byte[] data = new Byte[256];
        data = System.Text.Encoding.ASCII.GetBytes(message);

        NetworkStream stream = client.GetStream();


        stream.Write(data, 0, data.Length);

        output = "Sent: " + message;
        MessageBox.Show(output);
 
        data = new Byte[256];
 
        String responseData = String.Empty;
 
        Int32 bytes = stream.Read(data, 0, data.Length);
        responseData = System.Text.Encoding.ASCII.GetString(data, 0, bytes);
        output = "Received: " + responseData;
        MessageBox.Show(output);
 
        stream.Close();
        client.Close();
        return responseData;
    }
    catch (ArgumentNullException e)
    {
        output = "ArgumentNullException: " + e;
        MessageBox.Show(output);
        return e.Message;
    }
    catch (SocketException e)
    {
        output = "SocketException: " + e.ToString();
        MessageBox.Show(output);
        return e.Message;
    }
}

private void button1_Click(object sender, EventArgs e)
{
    string serverIP = "192.168.0.205";
    string message = textBox1.Text;
    textBox2.Text=Connect(serverIP, message);
}

推荐答案

请参阅我对该问题的评论。您可以在我过去的答案中找到一些有用的想法：

来自同一端口号码的多个客户端 [ ^ ]，

业余爱好者套接字编程中的问题 [ ^ ] 。



您描述的内容与发布者 - 订阅者模型类似。您可以将TCP连接视为订阅。这样，您就不需要客户倾听。即使你需要它，你也不需要一个单独的端口（这没关系）。

-SA

Please see my comments to the question. You can find some useful ideas in my past answers:
Multple clients from same port Number[^],
an amateur question in socket programming[^].

What you describe looks similar to publisher-subscriber model. You can treat TCP connection as subscription. This way, you won't need clients to listen. And even if you needed that, you would not need a separate port (it just doesn't matter).

—SA

以下文章对此有所帮助。

使用异步UDP套接字的聊天应用程序 [ ^ ]



好​​工作hitesh

this following article helped for this.
A Chat Application Using Asynchronous UDP sockets[^]

good job hitesh

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