为什么我的 TCP 客户端发送的是汉字？ [复制]

Question

所以我正在做一个非常简单的项目，一个连接到可以接收数据的预制服务器的客户端。 我正在尝试发送一个缓冲区，但是当它恢复缓冲区时，即使我正在尝试发送“Hello World！”，它也会获得中文字符。

我如何正确编码我的缓冲区，以便当服务器接收到它时，它不会接收到中文字符？

还有..客户端发送完后就卡住了，这是为什么呢？

Visual representation showing what it looks like

const string IP = "127.0.0.1";
        const int port = 12345;
        TcpClient Client = new TcpClient();

        public Form1()
        {
            Client.NoDelay = true;
            InitializeComponent();
        }

        private void SendMessage()
        {
            //Create the message we are going to send.
            string texttoSend = DateTime.Now.ToString();

            //Create a network stream to get all the data that comes and goes through the client.
            NetworkStream nwStream = Client.GetStream();

            //Convert out string message to a byteArray because we will send it as a buffer later.
            byte[] bytesToSend = Encoding.ASCII.GetBytes(texttoSend);

            //Write out to the console what we are sending.
            Console.WriteLine("Sending: " + texttoSend);

            //Use the networkstream to send the byteArray we just declared above, start at the offset of zero, and the size of the packet we are sending is the size of the messages length.
            nwStream.Write(bytesToSend, 0, bytesToSend.Length);

            //Recieve the bytes that are coming from the other end (server) through the client and store them in an array.
            byte[] bytesToRead = new byte[Client.ReceiveBufferSize];

            //read the bytes, starting from the offset 0, and the size is what ever the client has recieved.
            int bytesRead = nwStream.Read(bytesToRead, 0, Client.ReceiveBufferSize);

            //Decode the bytes we just recieved using the Encoding.ASCII.GetString function and give it the correct parameters
            //1. What it should decode
            //2. Starting to decode from what offset
            //3. How much do we want to decode?
            Console.WriteLine("Recieved: " + Encoding.ASCII.GetString(bytesToRead, 0, bytesRead));
            Console.ReadLine();

            //Close the client so we're not leaving it open for people to eavesdrop.
            Client.Close();
        }

        private async Task Connect()
        {

            try
            {
                await Client.ConnectAsync(IP, port);
                btnConnect.BackColor = Color.Green;
                btnConnect.Text = "Connected.";
            }
            catch (Exception e)
            {
                MessageBox.Show("Server refused the connection.", "Error", MessageBoxButtons.RetryCancel, MessageBoxIcon.Warning);
                Debug.Print(e.ToString());
            }
        }

        private async void btnConnect_ClickAsync(object sender, EventArgs e)
        {
            await Connect();
        }

        private void btnSendAll_Click(object sender, EventArgs e)
        {
            SendMessage();
        }

Answer 1

您确定服务器期待使用 ASCII 编码的请求吗？您看到的问题很可能是服务器和客户端之间的编码不匹配。 NET 默认使用 UTF8。

您还可以使用StreamReader 和StreamWriter 来简化一些代码。

private void SendMessage()
{
    //---data to send to the server---
    string textToSend = DateTime.Now.ToString();

    NetworkStream nwStream = Client.GetStream();

    //---send the text---
    Console.WriteLine("Sending : " + textToSend);
    using (StreamWriter nwsWriter = new StreamWriter(nwStream, Encoding.ASCII))
    {
        nwsWriter.Write(textToSend);
    }

    //---read back the text---
    using (StreamReader reader = new StreamReader(nwStream, Encoding.ASCII))
    {
        string responseText = reader.ReadToEnd();
        Debug.Print("Received : " + responseText);
    }

    Client.Close();
}

Answer 2

服务器似乎正在与您的应用程序使用 Unicode 或其他编码。

我做了一个与你类似的快速版本，但在“服务器”上解码为 un​​icode 并获取一些中文字符。

http://share.linqpad.net/4bf7ag.linq

发送：20/01/2018 12:33:59 PM

收件：〲〯⼱〲㠱ㄠ㨲㌳㔺‹䵐

//Create the message we are going to send.
string texttoSend = DateTime.Now.ToString();

//Create a network stream to get all the data that com
MemoryStream nwStream = new MemoryStream();

//Convert out string message to a byteArray because we
byte[] bytesToSend = Encoding.ASCII.GetBytes(texttoSen

//Write out to the console what we are sending.
Console.WriteLine("Sending: " + texttoSend);

//Use the networkstream to send the byteArray we just 
nwStream.Write(bytesToSend, 0, bytesToSend.Length);

Encoding.Unicode.GetString(nwStream.ToArray()).Dump();

Answer 3

将缓冲区的编码更改为 Unicode！

byte[] bytesToSend = Encoding.Unicode.GetBytes(texttoSend);