c# - 为什么 Environment.NewLine 在字节数组和字符串之间转换时不起作用

Question

我正在使用 TCP 在服务器和客户端之间发送数据。我发送字节流，所以我将字符串转换为字节数组，发送给客户端，然后将其转换回字符串。然后我将这个字符串插入一个多行文本框，每行文本框后面都有 Environment.NewLine。但是，没有出现新行。

我尝试了多种将字符串转换为数组并返回字符串的方法，结果都相同。 Environment.NewLine 不起作用。 \n\r 不起作用。

我试过使用以下技术进行转换:

1. Encoding.ASCII.GetString() 和 Encoding.ASCII.GetBytes()
2. Encoding.Unicode.GetString() 和 Encoding.Unicode.GetBytes()

3. 我还在以下网站上使用了代码:

   System.Text.UTF8Encoding encoding=new System.Text.UTF8Encoding();
   String to Byte Array Conversion in C# and VB.NET (and back)

我应该如何来回转换这些字符串才能使其正常工作？我的客户端目前使用 C#，但在生产环境中将使用 Java。

编辑:

    AttachMessage(ByteArrayToStr(messageInByteArray)); // Doesn't work
    AttachMessage("TEST"); // works


    public void AttachMessage(string data)
    {
        textBox2.Text += data + Environment.NewLine;
    }

    public static string ByteArrayToStr(byte[] arr)
    {
        System.Text.UTF8Encoding encoding = new System.Text.UTF8Encoding();
        return encoding.GetString(arr);
    }

    public static byte[] StrToByteArray(string str)
    {
        System.Text.UTF8Encoding encoding = new System.Text.UTF8Encoding();
        return encoding.GetBytes(str);
    }

这是一个转换问题，因为它适用于未转换的字符串。

编辑 2:

public partial class Form1 : Form
{
    public volatile List<TcpClient> connectedClients;
    public volatile bool ServerOn;
    public volatile TcpListener server;
    public delegate void txtBoxDelegate(string data);
    public delegate void tcpCommand(string ipAddress);
    public delegate void chatMessageDelegate(byte[] message);

    public Form1()
    {
        InitializeComponent();
        connectedClients = new List<TcpClient>();
        ServerOn = false;
        server = new TcpListener(System.Net.IPAddress.Parse("127.0.0.1"), 6789);
    }

    private void button1_Click(object sender, EventArgs e)
    {
        if (!ServerOn)
        {
            Thread serverThread = new Thread(new ThreadStart(TcpServer));
            serverThread.IsBackground = true;
            serverThread.Start();
            lblServerStatus.Text = "The server is On.";
            lblServerStatus.ForeColor = Color.Green;
            lstServerUpdates.Text = String.Empty;
            button1.Text = "Turn server Off";
            ServerOn = true;
        }
        else
        {
            ServerOn = false;
            lstServerUpdates.Text = "Server has been turned off.";
            lblServerStatus.Text = "The server is Off.";
            lblServerStatus.ForeColor = Color.Red;
        }
    }

    public static string ByteArrayToStr(byte[] arr)
    {
        System.Text.UTF8Encoding encoding = new System.Text.UTF8Encoding();
        return encoding.GetString(arr);
    }

    public static byte[] StrToByteArray(string str)
    {
        System.Text.UTF8Encoding encoding = new System.Text.UTF8Encoding();
        return encoding.GetBytes(str);
    }

    private void TcpServer()
    {
        printToTextBox("Starting TCP Server.");

        server.Start();
        while (ServerOn)
        {
            if (!server.Pending())
            {
                Thread.Sleep(10);
                continue;
            }
            TcpClient clientSocket = server.AcceptTcpClient();

            NetworkStream stream = clientSocket.GetStream();

            connectedClients.Add(clientSocket);

            Thread clientThread = new Thread(new ParameterizedThreadStart(ClientThreads));
            clientThread.Start(clientSocket);

            byte[] bytes = StrToByteArray("Successfully connected to the server.");

            stream.Write(bytes, 0, bytes.Length);
            printToTextBox("Client successfully connected to server.");
        }


        server.Stop();
    }

    public void ClientThreads(object tcpClient)
    {
        TcpClient clientSocket = (TcpClient)tcpClient;
        NetworkStream clientStream = clientSocket.GetStream();

        byte[] clientMessage = new byte[100];

        while (ServerOn)
        {
            clientStream.Read(clientMessage, 0, clientMessage.Length);
            string message = ByteArrayToStr(clientMessage);
            if (message.Contains("!chat"))
            {
                SendChatMessage(StrToByteArray(message.Substring(5) + Environment.NewLine));
            }
            else if (message.Contains("!start")) 
            {
                StartWebcam(((IPEndPoint)clientSocket.Client.RemoteEndPoint).Address.ToString());
            }
            else if (message.Contains("!stop"))
            {
                StopWebcam(((IPEndPoint)clientSocket.Client.RemoteEndPoint).Address.ToString());
            }
        }
        clientSocket.Close();
        connectedClients.Clear();
    }

    public void printToTextBox(string data)
    {
        if (this.InvokeRequired)
        {
            this.BeginInvoke(new txtBoxDelegate(printToTextBox), data);
            return;
        }
        lstServerUpdates.Text += data + Environment.NewLine;
    }

    public void SendChatMessage(byte[] message)
    {
        foreach (TcpClient client in connectedClients)
        {
            NetworkStream stream = client.GetStream();
            stream.Write(message, 0, message.Length);
            printToTextBox(ByteArrayToStr(message));
        }
    }

    public void StartWebcam(string IPAddress)
    {
        if (this.InvokeRequired)
        {
            this.BeginInvoke(new tcpCommand(StartWebcam), IPAddress);
            return;
        }

        //code to stop webcam for the specified client
        printToTextBox("Starting webcam for IP: " + IPAddress);
    }

    public void StopWebcam(string IPAddress)
    {
        if (this.InvokeRequired)
        {
            this.BeginInvoke(new tcpCommand(StopWebcam), IPAddress);
            return;
        }

        //code to stop webcam for specified client
        printToTextBox("Stopping webcam for IP: " + IPAddress);
    }
}

Answer 1

I send a stream of bytes

没错，TCP 是一个流。它不支持任何类似“数据包”的东西。就像一行文字。除了在客户端关闭连接之前接收一切 之外，没有明显的方法可以将流转换为 byte[]。这当然意味着您将显示一切，然后是单个 Environment.NewLine。

重新考虑您的方法。就像实际发送数据中的行尾一样，因此您不必将它们添加到接收器中。通过首先发送编码数据包长度的 4 个字节来人工创建数据包是另一种方法。