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   源码介绍

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nMqtt类实现客户端和服务端

服务端：

客户端：

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Net.Sockets;
using System.Threading;
using System.Net;
using System.IO;
using LitJson;
using AsyncIocpServer;
using nMqtt.Messages;

namespace nMqttServer
{
    public partial class Form1 : Form
    {
        //主窗体
        public static Form1 mainform = null;
        //server服务
        public static IocpServer serverSocket;
        public static MqttServer mqttServer = new MqttServer();

        public string IPAddr;
        public int maxRecePackIndex;
        public int recePackIndex;
        public int ipNum;
        public int qos;
        public bool isShowUser;
        public bool startButton;

        public delegate void SetListBoxCallBack(string str);
        public SetListBoxCallBack setlistboxcallback;

        public static void Dubeg(string str)//跨线程调用
        {
            Form1.mainform.Invoke(Form1.mainform.setlistboxcallback, str);
        }

        public void SetListBox(string str)
        {
            if (listBox1.Items.Count > 100)
                listBox1.Items.Clear();
            listBox1.Items.Insert(0, str);
            listBox1.SelectedIndex = 0;
        }

        //获取主窗体
        public static Form1 GetMainForm()
        {
            if (mainform != null)
                return mainform;
            return null;
        }

        /// <summary>
        /// 验证IP地址是否有效
        /// </summary>
        /// <param name="ip"></param>
        /// <returns></returns>
        private static bool IsCorrentIP(string ip)
        {
            string pattrn = @"(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])";
            if (System.Text.RegularExpressions.Regex.IsMatch(ip, pattrn))
                return true;
            else
                return false;
        }

        public Form1()
        {
            InitializeComponent();
            setlistboxcallback = new SetListBoxCallBack(SetListBox);
            Form1.mainform = this;
            isShowUser = false;
            startButton = false;
            qosComboBox.SelectedIndex = 0;
            ipNum = 0;
            mqttServer.ReaderRetainMessages();
            IPAddress[] addressList = Dns.GetHostEntry(Environment.MachineName).AddressList;
            foreach (IPAddress ip in addressList)
            {
                if (IsCorrentIP(ip.ToString()))
                {
                    ipNum  ;
                    ipComboBox.Items.Add(ip);
                    //SetListBox(String.Format("addressList {0} ", ip));
                    if (ipComboBox.Items.Count > 0)
                        ipComboBox.SelectedIndex = ipComboBox.Items.Count - 1;
                }
            }
            if (ipNum > 0)
                msg.Text = "有多个IP!";
        }

        // 断开客户端事件
        public void disconnect(object sender, SocketAsyncEventArgs e)
        {
            AsyncUserToken userToken = e.UserToken as AsyncUserToken;
            try
            {
                mqttServer.RemoveIdFromSubscribeTopic(userToken.ConnectionId);
                mqttServer.DelMqttClientToConnectionId(userToken.ConnectionId);
            }
            catch (Exception ex)
            {
            }
        }

        // 接收到数据事件
        public void clientread(object sender, SocketAsyncEventArgs e)
        {
            AsyncUserToken userToken = e.UserToken as AsyncUserToken;
            try
            {
                byte[] destArray = new byte[e.BytesTransferred];// 目的字节数组
                Array.Copy(userToken.ReceiveBuffer, e.Offset, destArray, 0, e.BytesTransferred);
                //string str = System.Text.Encoding.UTF8.GetString(destArray);
                if (destArray[0] == 0xAB && destArray[2] == 0xAB)
                {
                    //自定义协议
                }
                else
                {
                    //MQTT协议解码
                    //mqttServer.DecodeMessage(destArray, userToken.ConnectionId);//解码消息
                }
                recePackIndex  ;
            }
            catch (Exception ex) 
            {
                MessageBox.Show(ex.ToString());
            }
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            topicNum.Text = mqttServer.SubscribeTopicCount.ToString();
            userNum.Text = mqttServer.ActiveMqttClientCount.ToString();
            if (serverSocket != null)
                connCnt.Text = serverSocket.ClientCount.ToString();
        }

        private void timer2_Tick(object sender, EventArgs e)
        {
            if (recePackIndex > maxRecePackIndex)
                maxRecePackIndex = recePackIndex;
            packIndex.Text = maxRecePackIndex.ToString();
            msg.Text = "每秒接收 "   recePackIndex   " 个数据包";
            recePackIndex = 0;
        }

        private void startBtn_Click(object sender, EventArgs e)
        {
            try
            {
                int m_port = 0;
                int count = 0;
                int buffersize = 0;
                if (startButton == false)
                {
                    if (!int.TryParse(maxNum.Text, out count))
                    {
                        MessageBox.Show("连接数量错误!请重新填写!");
                        return;
                    }
                    if (!int.TryParse(buffer.Text, out buffersize))
                    {
                        MessageBox.Show("缓冲区填写错误!请重新填写!");
                        return;
                    }
                    if (!int.TryParse(port.Text, out m_port))
                    {
                        MessageBox.Show("端口填写错误,请重新填写!");
                        return;
                    }
                    if (count > 62000)
                    {
                        MessageBox.Show("连接数量最大62000!请重新填写!");
                        return;
                    }
                    if (buffersize > 1024)
                    {
                        MessageBox.Show("缓冲区最大1024!请重新填写!");
                        return;
                    }
                    if (m_port > 65535)
                    {
                        MessageBox.Show("端口填写错误,请重新填写!");
                        return;
                    }
                    startButton = true;
                    startBtn.Text = "停止监听";
                    serverSocket = new IocpServer(count, buffersize);
                    serverSocket.Start(IPAddr, m_port);
                    serverSocket.OnClientRead  = new EventHandler<SocketAsyncEventArgs>(clientread);
                    serverSocket.OnClientDisconnect  = new EventHandler<SocketAsyncEventArgs>(disconnect);
                    serverSocket.mainForm = this;
                    SetListBox("开始监听");
                    timer2.Enabled = true;
                }
                else
                {
                    startButton = false;
                    startBtn.Text = "开始监听";
                    serverSocket.Stop();
                    SetListBox("停止监听");
                    timer2.Enabled = false;
                }
            }
            catch (Exception ex)
            {
                //SetListBox("异常来自于 Form1.cs StartServer  "   ex.ToString());
            }
        }

        private void ipComboBox_SelectedIndexChanged(object sender, EventArgs e)
        {
            IPAddr = ipComboBox.SelectedItem.ToString();
        }

        private void qosComboBox_SelectedIndexChanged(object sender, EventArgs e)
        {
            string str = qosComboBox.SelectedItem.ToString();
            str = str.Substring(0, 1);
            if (!int.TryParse(str, out qos))
                MessageBox.Show("值错误!");
        }

        private void cleanListBox_Click(object sender, EventArgs e)
        {
            listBox1.Items.Clear();
        }

        private void peekTopic_Click(object sender, EventArgs e)
        {
            mqttServer.PeekTopic();
        }

        //单独发送给某个主题,或者群发消息
        private void sendBtn_Click(object sender, EventArgs e)
        {
            if (topicTextBox.Text == "")
            {
                SetListBox("主题为空");
                return;
            }
            if (sendTextBox.Text == "")
            {
                SetListBox("消息为空");
                return;
            }
            byte[] data = System.Text.Encoding.UTF8.GetBytes(sendTextBox.Text);
            if (startButton)
            {
                if (mqttServer.ActiveMqttClientCount == 0)
                {
                    SetListBox("没有用户");
                    return;
                }
                if (multiSendCheckBox.Checked)//群发
                {
                    qosComboBox.SelectedIndex = 0;//设置Qos=0
                    mqttServer.ToAllMqttClientPublishMsg(topicTextBox.Text, data, qos);
                    SetListBox("群发完成");
                    return;
                }
                mqttServer.ToPublishSubscribeTopicMsg(topicTextBox.Text, data, qos);
            }
            else
            {
                SetListBox("请开启服务器");
            }
        }

        //搜索用户
        private void findBtn_Click(object sender, EventArgs e)
        {
            if (inUser.Text == "")
            {
                SetListBox("请输入用户名");
                return;
            }
            mqttServer.FindMqttClient(inUser.Text);
        }

        //剔除一个用户
        private void delBtn_Click(object sender, EventArgs e)
        {
            if (inUser.Text == "")
            {
                SetListBox("请输入用户名");
                return;
            }
            mqttServer.DelMqttClienToUserName(inUser.Text);
        }

        //关闭窗口时出发的事件
        private void Form1_FormClosed(object sender, FormClosedEventArgs e)
        {
            try
            {
                mqttServer.PubThreadClose();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message.ToString());
            }

        }

        public enum stateFlag
        {
            None = 0,
            Add,
            Remove,
            Clear
        }
  
    }

    public class obj1
    {
        public string username;
        public string connectid;
        public override string ToString()
        {
            return username;
        }
    }

}