C# SuperSocket 基础八【FixedHeaderReceiveFilter--头部格式固定并且包含内容长度的协议】

一、服务端
public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            MyServer appServer = new MyServer();
            var se = new SuperSocket.SocketBase.Config.ServerConfig();
            se.TextEncoding = "Unicode";// System.Text.Encoding.
            se.TextEncoding = "gbk";// System.Text.Encoding.
            se.Ip = "127.0.0.1";
            se.Port = 2020;
            se.Mode = SocketMode.Tcp;


            if (!appServer.Setup(se)) //Setup with listening port
            {
                Console.WriteLine("Failed to setup!");
                Console.ReadKey();
                return;
            }
            Console.WriteLine();
            //Try to start the appServer
            if (!appServer.Start())
            {
                Console.WriteLine("Failed to start!");
                Console.ReadKey();
                return;
            }

            //appServer.NewSessionConnected += appServer_NewSessionConnected;
            //appServer.SessionClosed += appServer_SessionClosed;
            appServer.NewRequestReceived += appServer_NewRequestReceived;
        }
        static void appServer_NewRequestReceived(MySession session, BinaryRequestInfo requestInfo)
        {
            string key = requestInfo.Key;
            switch (key)
            {
                case "1":
                    Console.WriteLine("Get message from " + session.RemoteEndPoint.ToString() + ":" + System.Text.Encoding.UTF8.GetString(requestInfo.Body));
                    break;
                case "2":
                    Console.WriteLine("Get image");
                    break;
                default:
                    Console.WriteLine("Get unknown message.");
                    break;
            }
        }
    }

 public class MyServer : AppServer<MySession, BinaryRequestInfo>
    {
        public MyServer()
            : base(new DefaultReceiveFilterFactory<MyReceiveFilter, BinaryRequestInfo>()) //使用默认的接受过滤器工厂 (DefaultReceiveFilterFactory)
        {
        }
    }

    public class MySession : AppSession<MySession, BinaryRequestInfo>
    {
    }

public class MyReceiveFilter : FixedHeaderReceiveFilter<BinaryRequestInfo>
    {

        public MyReceiveFilter()
            : base(10)//消息头部长度
        { }
        /// <summary>
        ///
        /// </summary>
        /// <param name="header">*byte[] header * 缓存的数据，这个并不是单纯只包含协议头的数据,有时候tcp协议长度为409600,很多</param>
        /// <param name="offset">头部数据从 缓存的数据 中开始的索引,一般为0.(tcp协议有可能从405504之类的一个很大数据开始)</param>
        /// <param name="length">这个length和base(10)中的参数相等</param>
        /// <returns></returns>
        protected override int GetBodyLengthFromHeader(byte[] header, int offset, int length)
        {
            return GetBodyLengthFromHeader(header, offset, length, 6, 4);//6表示第几个字节开始表示长度.4:由于是int来表示长度,int占用4个字节
        }
        protected override BinaryRequestInfo ResolveRequestInfo(ArraySegment<byte> header, byte[] bodyBuffer, int offset, int length)
        {

            byte[] body = new byte[length];
            Array.Copy(bodyBuffer, offset, body, 0, length);

            Int16 type = BitConverter.ToInt16(header.Array, 4);

            BinaryRequestInfo r = new BinaryRequestInfo(type.ToString(), body);
            return r;

            //以下的代码,不解析body,全部返给上一层
            //byte[] h = header.ToArray();
            //byte[] full = new byte[h.Count()+length];
            //Array.Copy(h, full, h.Count());
            //Array.Copy(body, 0, full, h.Count(), body.Length );
            //BinaryRequestInfo r = new BinaryRequestInfo("",full);
            //return r;

        }

        /// <summary>
        ///
        /// </summary>
        /// <param name="header">需要解析的数据</param>
        /// <param name="offset">头部数据从header中开始的索引,一般为0,也可能不是0</param>
        /// <param name="length">这个length和base(10)中的参数相等</param>
        /// <param name="lenStartIndex">表示长度的字节从第几个开始</param>
        /// <param name="lenBytesCount">几个字节来表示长度:4个字节=int,2个字节=int16,1个字节=byte</param>
        /// <returns></returns>
        private int GetBodyLengthFromHeader(byte[] header, int offset, int length, int lenStartIndex, int lenBytesCount)
        {
            var headerData = new byte[lenBytesCount];
            Array.Copy(header, offset + lenStartIndex, headerData, 0, lenBytesCount);//
            if (lenBytesCount == 1)
            {
                int i = headerData[0];
                return i;
            }
            else if (lenBytesCount == 2)
            {
                int i = BitConverter.ToInt16(headerData, 0);
                return i;
            }
            else //  if (lenBytesCount == 4)
            {
                int i = BitConverter.ToInt32(headerData, 0);
                return i;
            }
        }
    }

二、客户端
 public class MyTcpClient
    {
        private System.Net.Sockets.TcpClient tcpClient;
        public MyTcpClient(string ip, int port)
        {

            tcpClient = new System.Net.Sockets.TcpClient(ip, port);
            byte[] recData = new byte[1024];
            Action a = new Action(() =>
            {
                while (true)
                {
                    tcpClient.Client.Receive(recData);
                    var msg = System.Text.Encoding.UTF8.GetString(recData);
                    Console.WriteLine(msg);
                }
            });
            a.BeginInvoke(null, null);

        }

        public void Send(string message)
        {
            var data = System.Text.Encoding.UTF8.GetBytes(message);
            tcpClient.Client.Send(data);
        }
        public void Send(byte[] message)
        {
            tcpClient.Client.Send(message);
        }
    }

public class SuperSocketMessage
    {
        public byte[] Start;//4个字节
        public ushort Type;//2个字节, 1表示文字消息,2表示图片消息,其他表示未知,不能解析
        public int Len;//4个字节
        public string Message;//文本信息
        public byte[] Tail;//消息结尾

        public SuperSocketMessage()
        {
            Start = new byte[] { 0xFF, 0xFF, 0xFF, 0xFF };
            Tail = new byte[] { 0x1F, 0x1F, 0x1F, 0x1F };
        }

        public byte[] ToBytes()
        {
            List<byte> list = new List<byte>();
            list.AddRange(Start);
            var t = BitConverter.GetBytes(Type);
            list.AddRange(t);

            var t3 = System.Text.Encoding.UTF8.GetBytes(Message);
            var t2 = BitConverter.GetBytes(t3.Length);//注意,这里不是Message.Length,而是Message转化成字节数组后的Lenght

            list.AddRange(t2);
            list.AddRange(t3);

            return list.ToArray();
        }
    }

        private void button1_Click(object sender, EventArgs e)
        {
            MyTcpClient c = new MyTcpClient("127.0.0.1", 2020);
            SuperSocketMessage msg = new SuperSocketMessage();
            msg.Type = 1;
            msg.Message = "aaa"; ;
            byte[] bytes = msg.ToBytes();
            string hexString = BitConverter.ToString(bytes).Replace("-", "");
            c.Send(msg.ToBytes());

        }

来源:https://blog.csdn.net/ba_wang_mao/article/details/118788365