从套接字读取直到客户端在 C# 中发送 EOL

Question

我有一个看起来像这样的基本套接字服务器：

    IPEndPoint localEndPoint = new IPEndPoint(IPAddress.Any, 8000);
    Socket newsock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
    try
    {
        newsock.Bind(localEndPoint);
    }
    catch (Exception e)
    {
        //Errors handled
    }
    newsock.Listen(10);
    Console.WriteLine("Bound to port 8000");
    Socket client = newsock.Accept();
    while (client.Connected)
    {
        Console.WriteLine("Connection recieved.");
        string outputString = null;
        byte[] buffer = new byte[4];
        client.Receive(buffer);
        string bit = null;
        while (bit != "\r\n" || bit != "\n" || bit != "\r")
        {
            bit = Encoding.ASCII.GetString(buffer);
            outputString += bit;
        }
        Console.WriteLine(outputString);
    }

现在我希望它接受输入，直到用户（当前是 telnet）发送 EOL（按回车键）上面的代码大部分是我迄今为止尝试过的，我应该怎么做？

Answer 1

好吧，TCP 在流中工作，所以为了检测任何东西，你必须预料到 \r\n 不是唯一在你的缓冲区中的情况。

代替

bit != "\r\n" || bit != "\n" || bit != "\r"

和

!bit.Contains("\r") && !bit.Contains("\n")

不要忘记用来自 TCPStream 的数据重新填充“位”......意思是

while (bit != "\r\n" || bit != "\n" || bit != "\r")
{
    bit = Encoding.ASCII.GetString(buffer);
    outputString += bit;
}

你需要

client.Receive(buffer);

所以它看起来像：

while (bit != "\r\n" || bit != "\n" || bit != "\r")
{
    bit = Encoding.ASCII.GetString(buffer);
    outputString += bit;
    client.Receive(buffer);
}

而且...异常处理程序会在客户端断开连接时通知您。

Answer 2

发送 EOL 字符时，您可能会收到多个字符尝试：

while (bit != null && !bit.EndsWith("\r") && !bit.EndsWith("\n") )