与众不同 windows phone (31) - Communication（通信）之基于 Socket UDP 开发一个多人聊天室

/*
 * Socket UDP 聊天室的服务端
 * 
 * 注：udp 报文（Datagram）的最大长度为 65535（包括报文头）
 */

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 System.Net.Sockets;
using System.Net;
using System.Threading;
using System.IO;

namespace SocketServerUdp
{
    public partial class Main : Form
    {
        SynchronizationContext _syncContext;

        System.Timers.Timer _timer;

        // 客户端终结点集合
        private List<IPEndPoint> _clientList = new List<IPEndPoint>();

        public Main()
        {
            InitializeComponent();

            // UI 线程
            _syncContext = SynchronizationContext.Current;

            // 启动后台线程接收数据
            Thread thread = new Thread(new ThreadStart(ReceiveData));
            thread.IsBackground = true;
            thread.Start();

            // 每 10 秒运行一次计时器所指定的方法，群发信息
            _timer = new System.Timers.Timer();
            _timer.Interval = 10000d;
            _timer.Elapsed += new System.Timers.ElapsedEventHandler(_timer_Elapsed);
            _timer.Start();
        }

        // 接收数据
        private void ReceiveData()
        {
            // 实例化一个 UdpClient，监听指定端口，用于接收信息
            UdpClient listener = new UdpClient(3367);
            // 客户端终结点
            IPEndPoint clientEndPoint = null;

            try
            {
                while (true)
                {
                    // 一直等待，直至接收到数据为止（可以获得接收到的数据和客户端终结点）
                    byte[] bytes = listener.Receive(ref clientEndPoint);
                    string strResult = Encoding.UTF8.GetString(bytes);

                    OutputMessage(strResult);

                    // 将发送此信息的客户端加入客户端终结点集合
                    if (!_clientList.Any(p => p.Equals(clientEndPoint)))
                        _clientList.Add(clientEndPoint);
                }
            }
            catch (Exception ex)
            {
                OutputMessage(ex.ToString());
            }
        }

        private void _timer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
        {
            // 每 10 秒群发一次信息
            SendData(string.Format("webabcd 对所有人说：大家好！ 【信息来自服务端 {0}】", DateTime.Now.ToString("hh:mm:ss")));
        }

        // 发送数据
        private void SendData(string data)
        {
            // 向每一个曾经向服务端发送过信息的客户端发送信息
            foreach (IPEndPoint ep in _clientList)
            {
                // 实例化一个 UdpClient，用于发送信息
                UdpClient udpClient = new UdpClient();

                try
                {
                    byte[] byteData = UTF8Encoding.UTF8.GetBytes(data);
                    // 发送信息到指定的客户端终结点，并返回发送的字节数
                    int count = udpClient.Send(byteData, byteData.Length, ep);
                }
                catch (Exception ex)
                {
                    OutputMessage(ex.ToString());
                }

                // 关闭 UdpClient
                // udpClient.Close();
            }
        }

        // 在 UI 上输出指定信息
        private void OutputMessage(string data)
        {
            _syncContext.Post((p) => { txtMsg.Text += p.ToString() + "\r\n"; }, data);
        }
    }
}

/*
 * 演示 ASM 和 SSM 用
 */

using System;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;

namespace Demo.Communication.SocketClient
{
    public class UdpPacketEventArgs : EventArgs
    {
        // UDP 包的内容
        public string Message { get; set; }
        // UDP 包的来源的 IPEndPoint 
        public IPEndPoint Source { get; set; }

        public UdpPacketEventArgs(byte[] data, IPEndPoint source)
        {
            this.Message = System.Text.Encoding.UTF8.GetString(data, 0, data.Length);
            this.Source = source;
        }
    }
}

<phone:PhoneApplicationPage 
    x:Class="Demo.Communication.SocketClient.UdpDemo"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"
    xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    FontFamily="{StaticResource PhoneFontFamilyNormal}"
    FontSize="{StaticResource PhoneFontSizeNormal}"
    Foreground="{StaticResource PhoneForegroundBrush}"
    SupportedOrientations="Portrait" Orientation="Portrait"
    mc:Ignorable="d" d:DesignHeight="768" d:DesignWidth="480"
    shell:SystemTray.IsVisible="True">

    <Grid x:Name="LayoutRoot" Background="Transparent">
        <StackPanel HorizontalAlignment="Left">

            <ScrollViewer x:Name="svChat" Height="400">
                <TextBlock x:Name="txtChat" TextWrapping="Wrap" />
            </ScrollViewer>

            <TextBox x:Name="txtName" />
            <TextBox x:Name="txtInput" KeyDown="txtInput_KeyDown" />
            <Button x:Name="btnSend" Content="发送" Click="btnSend_Click" />

        </StackPanel>
    </Grid>

</phone:PhoneApplicationPage>

/*
 * Socket UDP 聊天室的客户端
 */

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using Microsoft.Phone.Controls;

using System.Net.Sockets;
using System.Text;
using System.Threading;

namespace Demo.Communication.SocketClient
{
    public partial class UdpDemo : PhoneApplicationPage
    {
        // 客户端 Socket
        private Socket _socket;

        // 用于发送数据的 Socket 异步操作对象
        private SocketAsyncEventArgs _socketAsyncSend;

        // 用于接收数据的 Socket 异步操作对象
        private SocketAsyncEventArgs _socketAsyncReceive;

        // 是否已发送过数据
        private bool _sent = false;

        private ManualResetEvent _signalSend = new ManualResetEvent(false);

        public UdpDemo()
        {
            InitializeComponent();

            this.Loaded += new RoutedEventHandler(UdpDemo_Loaded);
        }

        void UdpDemo_Loaded(object sender, RoutedEventArgs e)
        {
            // 初始化姓名和需要发送的默认文字
            txtName.Text = "匿名用户" + new Random().Next(0, 9999).ToString().PadLeft(4, '0');
            txtInput.Text = "hi";

            // 实例化 Socket
            _socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);


            // 实例化 SocketAsyncEventArgs ，用于发送数据
            _socketAsyncSend = new SocketAsyncEventArgs();
            // 服务端的 EndPoint
            _socketAsyncSend.RemoteEndPoint = new DnsEndPoint("192.168.8.217", 3367);
            // 异步操作完成后执行的事件
            _socketAsyncSend.Completed += new EventHandler<SocketAsyncEventArgs>(_socketAsyncSend_Completed);
        }

        public void SendData()
        {
            byte[] payload = Encoding.UTF8.GetBytes(txtName.Text + "：" + txtInput.Text);
            // 设置需要发送的数据的缓冲区
            _socketAsyncSend.SetBuffer(payload, 0, payload.Length);

            _signalSend.Reset(); // 无信号

            // 异步地向服务端发送信息（SendToAsync - UDP；SendAsync - TCP）
            _socket.SendToAsync(_socketAsyncSend);
           
            _signalSend.WaitOne(3000); // 阻塞
        }

        void _socketAsyncSend_Completed(object sender, SocketAsyncEventArgs e)
        {
            if (e.SocketError != SocketError.Success)
            {
                OutputMessage(e.SocketError.ToString());
            }

            _signalSend.Set(); // 有信号

            if (!_sent)
            {
                _sent = true;
                // 注：只有发送过数据，才能接收数据，否则 ReceiveFromAsync() 时会出现异常
                ReceiveData();
            }
        }

        // 接收信息
        public void ReceiveData()
        {
            // 实例化 SocketAsyncEventArgs，并指定端口，以接收数据
            _socketAsyncReceive = new SocketAsyncEventArgs();
            _socketAsyncReceive.RemoteEndPoint = new IPEndPoint(IPAddress.Any, 3367);

            // 设置接收数据的缓冲区，udp 报文（Datagram）的最大长度为 65535（包括报文头）
            _socketAsyncReceive.SetBuffer(new Byte[65535], 0, 65535);
            _socketAsyncReceive.Completed += new EventHandler<SocketAsyncEventArgs>(_socketAsyncReceive_Completed);

            // 异步地接收数据（ReceiveFromAsync - UDP；ReceiveAsync - TCP）
            _socket.ReceiveFromAsync(_socketAsyncReceive);
        }

        void _socketAsyncReceive_Completed(object sender, SocketAsyncEventArgs e)
        {
            if (e.SocketError == SocketError.Success)
            {
                // 接收数据成功，将接收到的数据转换成字符串，并去掉两头的空字节
                var response = Encoding.UTF8.GetString(e.Buffer, e.Offset, e.BytesTransferred);
                response = response.Trim('\0');

                OutputMessage(response);
            }
            else
            {
                OutputMessage(e.SocketError.ToString());
            }

            // 继续异步地接收数据
            _socket.ReceiveFromAsync(e);
        }

        private void OutputMessage(string data)
        {
            // 在聊天文本框中输出指定的信息，并将滚动条滚到底部
            this.Dispatcher.BeginInvoke(
                delegate
                {
                    txtChat.Text += data + "\r\n";
                    svChat.ScrollToVerticalOffset(txtChat.ActualHeight - svChat.Height);
                }
            );
        }

        private void btnSend_Click(object sender, RoutedEventArgs e)
        {
            SendData();
        }

        private void txtInput_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.Key == Key.Enter)
            {
                SendData();
                this.Focus();
            }
        }
    }
}