Let's make a head for 6 Total length of bit message , And the length does not include the example of the length field itself . Like this Socket message 000006123456.

  1. add to SuperSocket.Engine, Use it directly Nuget Search for SuperSocket.Engine Can be installed , The dependency is SuperSocket and log4net.

    Note here ,SuperSocket 2.0 There will be no SuperSocket.Engine 了 , Use it directly SuperSocket that will do , But because I'm in .net framework 4.7 Used in the environment of ,SuperSocket 2.0 The minimum support .net standard 2.1 It can only support .net core already .net 5 6 了 , So it can't be used here .

  2. Create a ReceiveFilter.

public class LengthReceiveFilter: FixedHeaderReceiveFilter<StringRequestInfo>

    {

        public LengthReceiveFilter() : base(6)

        {

        }

        protected override int GetBodyLengthFromHeader(byte[] header, int offset, int length)

        {

            return int.Parse(Encoding.Default.GetString(header, offset, length));

        }

        protected override StringRequestInfo ResolveRequestInfo(ArraySegment<byte> header, byte[] bodyBuffer, int offset, int length)

        {

            return new StringRequestInfo("", Encoding.UTF8.GetString(bodyBuffer, offset, length), null);

        }

    }

Here we need to rewrite two methods , And call the constructor of the parent class .

public LengthReceiveFilter() : base(6) there 6 The length of the representative head is 6 position .

stay protected override int GetBodyLengthFromHeader(byte[] header, int offset, int length) In the method ,header Is the intercepted 6 Bit header byte Array ,offset It's the offset ,length It's length. , The return value is the total length of the message .

Because the first six digits in our message format are the message length in digital format , So we can use int.Parse(Encoding.Default.GetString(header, offset, length)) To get the message length , If the length includes the length itself , That's where we're going -6, Here, the length of the newspaper style is returned , If the length returned is too long , Will continue to wait for subsequent packages .

protected override StringRequestInfo ResolveRequestInfo(ArraySegment<byte> header, byte[] bodyBuffer, int offset, int length) It's the real parsing method ,

Convert our message into RequestInfo. Here we use StringRequestInfo, It is to convert the message directly into a string . among header It is the data of our message header , If you still need message headers here, start from header Take in ,bodyBuffer Is the content of our message ,offset It's the offset ,length It's length. .

If we were GetBodyLengthFromHeader The length returned in the method is longer than that of the report style , Then I will never walk to ResolveRequestInfo In this method .

  1. Create a new one MyAppServer Inherit AppServer

public class MyAppServer : AppServer

    {

        public MyAppServer() : base(new DefaultReceiveFilterFactory<LengthReceiveFilter,StringRequestInfo>())

        {

        }

    }

Here we use DefaultReceiveFilterFactory This built-in factory binds our Filter.

  1. Start the server 

private void button1_Click(object sender, EventArgs e)

        {

            AppServer appServer = new MyAppServer();

            appServer.NewSessionConnected += session =>

            {

            };

            appServer.NewRequestReceived += (session, info) =>

            {

                MessageBox.Show(info.Body);

                session.Send("hello");

                session.Close();

            };

            if (!appServer.Setup(1234))

            {

                MessageBox.Show(" Server setup failed ");

                return;

            }

            if (!appServer.Start())

            {

                MessageBox.Show(" Server start failed ");

                return;

            }

        }

We can directly new MyAppServer To create a server .Setup The parameter of the method is the port number , We use appServer.Setup(1234) Namely the SocketServer The listening port number is set to 1234,appServer.Start() Officially open the server .

appServer.NewSessionConnected It is an event when a new client connects , At this time, we can send a welcome message to the client , Or do something else .

appServer.NewRequestReceived It is the event of receiving a new message , We can get it here RequestInfo, So as to obtain the corresponding information . And you can go straight through Send Method to return a message .

The thing to note here is if Send Use string overloading directly , Then the default encoding format will be used , If the message UTF-8 Of , Then it is suggested to use Encoding.UTF8.GetBytes Turn into byte Array , And then use Send Array overload to send content .

  1. Shut down the server 

appServer.Stop();

You can turn off the server .

SuperSocket 1.6 Create a simple message length in the header Socket More articles about servers

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