.Net网络通讯编程[利用Socket实现字串、文件、序列化对象传输]--使用封装的网络服务4[聊天室]

本案例使用前面封装的网络服务类编写简易聊天室,采用Tcp和异步套接字相关技术：

App.config文件：

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <appSettings>
        <!--本地服务器名-->
        <add key="ServerName" value="127.0.0.1"/>
        <!--本地端口-->
        <add key="ServerPort" value="6001"/>

        <!--远程服务器名-->
        <add key="RemoteServerName" value="127.0.0.1"/>
        <!--远程服务器端口-->
        <add key="RemoteServerPort" value="6002"/>
    </appSettings>
</configuration>

聊天窗体完整代码：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using TcpLabCommon;
using System.Net.Sockets;
using System.Net;
using System.Configuration;
using System.Threading;
using System.IO;

namespace TcpLabChat1
{
    public partial class FrmChat : Form
    {
        delegate void UpdateViewHandler(NetPacket packet);
        delegate void UpdateViewWithMsgHandler(string msg);

        /// <summary>
        /// 文件对话框
        /// </summary>
        OpenFileDialog fd = new OpenFileDialog();

        /// <summary>
        /// Tcp服务对象[提供发包和收包功能]，接收消息和文件使用
        /// </summary>
        NetPacketService tcpPacketServiceSvr = null;

        /// <summary>
        /// Tcp服务对象[提供发包和收包功能],发送消息和文件使用
        /// </summary>
        NetPacketService tcpPacketServiceClient = null;
               
        /// <summary>
        /// 客户端Socket[发送消息和文件]
        /// </summary>
        Socket clientSocket = null;

        /// <summary>
        /// 本地服务器名
        /// </summary>
        public string ServerName
        {
            get
            {
                return ConfigurationManager.AppSettings["ServerName"];
            }
        }

        /// <summary>
        /// 本地监听端口
        /// </summary>
        public Int32 ServerPort
        {
            get
            {
                return Convert.ToInt32(ConfigurationManager.AppSettings["ServerPort"]);
            }
        }

        /// <summary>
        /// 对方服务器名
        /// </summary>
        public String RemoteServerName
        {
            get
            {
                return ConfigurationManager.AppSettings["RemoteServerName"];
            }
        }

        /// <summary>
        /// 对方服务器监听端口
        /// </summary>
        public Int32 RemoteServerPort
        {
            get
            {
                return Convert.ToInt32(ConfigurationManager.AppSettings["RemoteServerPort"]);
            }
        }

        public FrmChat()
        {
            InitializeComponent();
        }



        private void FrmChat_Load(object sender, EventArgs e)
        {
            ReceiveMessage();
        }

        /// <summary>
        /// 异步接收对方发来的消息
        /// </summary>
        private void ReceiveMessage()
        {
            Socket serverSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            EndPoint endPoint = new IPEndPoint(IPAddress.Parse(ServerName), ServerPort);//创建一个终结点
            serverSocket.Bind(endPoint);//绑定终结点
            serverSocket.Listen(0);//开始监听

            serverSocket.BeginAccept(new AsyncCallback(AsyncCallbackAccept),serverSocket);//接收一个请求
           
        }

        private void AsyncCallbackAccept(IAsyncResult result)
        {
            Socket serverSocket = (Socket)result.AsyncState;
            Socket ctSocket = serverSocket.EndAccept(result);
            NetworkStream netStream = new NetworkStream(ctSocket);
            tcpPacketServiceSvr = new NetPacketTcpAsynService(netStream);
            (tcpPacketServiceSvr as NetPacketTcpAsynService).OnReceivedPacket += new TcpAsynHandler1(FrmChat_OnReceivedPacket);
            
           
            tcpPacketServiceSvr.ReceivePacket();                
            
        }

        void FrmChat_OnReceivedPacket(NetPacket packet)
        {
            //在窗口界面所在的线程运行委托指向的方法,避免跨线程访问UI问题
            Invoke(new UpdateViewHandler(UpdateView), packet);
        }

        /// <summary>
        /// 更新界面
        /// </summary>
        /// <param name="packet"></param>
        private void UpdateView(NetPacket packet)
        {
            String msglist = txtMsgList.Text;
            switch (packet.PacketHead.PType)
            {
                case PacketType.STRING:
                    msglist += "\r\n对方说:"+packet.Data.ToString();
                    break;
                case PacketType.BINARY:
                    NetFile f = tcpPacketServiceSvr.ParseFile((Byte[])packet.Data);
                    msglist += "\r\n接收了对方发送的文件:"+f.FileName;
                    FileStream fs = null;
                    try
                    {
                        string fname = Application.StartupPath+"\\"+f.FileName;
                        fs = new FileStream(fname, FileMode.Create);                        
                        fs.Write(f.Content, 0, f.Content.Length);                        
                        fs.Flush();                       
                    }
                    catch (Exception e)
                    {
                        MessageBox.Show(e.Message);
                    }
                    finally
                    {
                        fs.Close();
                    }
                    break;
                case PacketType.COMPLEX:
                    break;
                default:
                    break;
            }

            txtMsgList.Text = msglist;
        }


        private void UpdateView(string msg)
        {
            String msglist = txtMsgList.Text;
            msglist += "\r\n"+msg;
            txtMsgList.Text = msglist;       
        }

        /// <summary>
        /// 发送消息
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnSendMsg_Click(object sender, EventArgs e)
        {
            if (txtMsg.Text.Trim().Length == 0)
                return;

            if (clientSocket == null)
            {
                clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
                clientSocket.Connect(IPAddress.Parse(RemoteServerName), RemoteServerPort);
                NetworkStream netStream = new NetworkStream(clientSocket);
                tcpPacketServiceClient = new NetPacketTcpAsynService(netStream);
            }
            //注册事件,当发送成功后执行的函数[注意该事件只注册一次]
            //取消订阅事件
            (tcpPacketServiceClient as NetPacketTcpAsynService).OnAfterSendPacket -= new TcpAsynHandler2(FrmChat_OnAfterSendPacket);
            //再次订阅事件
            (tcpPacketServiceClient as NetPacketTcpAsynService).OnAfterSendPacket += new TcpAsynHandler2(FrmChat_OnAfterSendPacket);
            //发包
            tcpPacketServiceClient.SendText(txtMsg.Text.Trim());            
        }

        /// <summary>
        /// 当发送成功后执行的函数
        /// </summary>
        /// <param name="msg"></param>
        void FrmChat_OnAfterSendPacket(NetPacketHead packetHead)
        {
            switch (packetHead.PType)
            {
                case PacketType.STRING:
                    String msglist = txtMsgList.Text;
                    msglist += "\r\n我说:" + txtMsg.Text.Trim();
                    txtMsgList.Text = msglist;
                    break;
                case PacketType.BINARY:
                    //在窗口界面所在的线程运行委托指向的方法,避免跨线程访问UI问题                
                    Invoke(new UpdateViewWithMsgHandler(UpdateView), "我发送了文件:" + new FileInfo(fd.FileName).Name);
                    break;
                case PacketType.COMPLEX:
                    break;
                default:
                    break;
            }
            
        }


        /// <summary>
        /// 发送文件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnSendFile_Click(object sender, EventArgs e)
        {
            
            if (fd.ShowDialog() == System.Windows.Forms.DialogResult.Cancel)
            {
                return;
            }

            if (clientSocket == null)
            {
                clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
                clientSocket.Connect(IPAddress.Parse(RemoteServerName), RemoteServerPort);
                NetworkStream netStream = new NetworkStream(clientSocket);
                tcpPacketServiceClient = new NetPacketTcpAsynService(netStream);
            }

            //注册事件,当发送成功后执行的函数[注意该事件只注册一次]
            //取消订阅事件
            (tcpPacketServiceClient as NetPacketTcpAsynService).OnAfterSendPacket -= new TcpAsynHandler2(FrmChat_OnAfterSendPacket);
            //再次订阅事件
            (tcpPacketServiceClient as NetPacketTcpAsynService).OnAfterSendPacket += new TcpAsynHandler2(FrmChat_OnAfterSendPacket);
                        

            tcpPacketServiceClient.SendFile(fd.FileName);

            
            
        }
    }
}