与众不同 windows phone (32) - Communication（通信）之任意源组播 ASM（Any Source Multicast）
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与众不同 windows phone (32) - Communication（通信）之任意源组播 ASM（Any Source Multicast）
与众不同 windows phone (32) - Communication（通信）之任意源组播 ASM（Any Source Multicast）
作者：webabcd
介绍
与众不同 windows phone 7.5 (sdk 7.1) 之通信
- 实现“任意源多播” - ASM（Any Source Multicast）
示例
实现 ASM 信道
UdpAnySourceMulticastChannel.cs
/* * 实现一个 ASM 信道（即 ASM 帮助类），供外部调用 * * * 通过 UdpAnySourceMulticastClient 实现 ASM（Any Source Multicast），即“任意源多播” * 多播组基于 IGMP（Internet Group Management Protocol），即“Internet组管理协议” * * UdpAnySourceMulticastClient - 一个发送信息到多播组并从任意源接收多播信息的客户端，即 ASM 客户端 * BeginJoinGroup(), EndJoinGroup() - 加入多播组的异步方法 * BeginReceiveFromGroup(), EndReceiveFromGroup() - 从多播组接收信息的异步方法（可以理解为接收多播组内所有成员发送的信息） * BeginSendToGroup(), EndSendToGroup() - 发送信息到多播组的异步方法（可以理解为发送信息到多播组内的全部成员） * ReceiveBufferSize - 接收信息的缓冲区大小 * SendBufferSize - 发送信息的缓冲区大小 * * BeginSendTo(), EndSendTo() - 发送信息到指定目标的异步方法 * BlockSource() - 阻止指定源，以便不再接收该源发来的信息 * UnblockSource() - 取消阻止指定源 * MulticastLoopback - 发出的信息是否需要传给自己 * */ 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; using System.Text; using System.Net.Sockets; namespace Demo.Communication.SocketClient { public class UdpAnySourceMulticastChannel : IDisposable { // ASM 客户端 private UdpAnySourceMulticastClient _client; // 接收信息的缓冲区 private byte[] _buffer; // 此客户端是否加入了多播组 private bool _isJoined; /// <summary> /// 构造函数 /// </summary> /// <param name="groupAddress">多播组地址</param> /// <param name="port">多播组的端口</param> /// <param name="maxMessageSize">接收信息的缓冲区大小</param> /// <remarks> /// 注：udp 报文（Datagram）的最大长度为 65535（包括报文头） /// </remarks> public UdpAnySourceMulticastChannel(IPAddress groupAddress, int port, int maxMessageSize) { _buffer = new byte[maxMessageSize]; // 实例化 ASM 客户端，需要指定的参数为：多播组地址；多播组的端口 _client = new UdpAnySourceMulticastClient(groupAddress, port); } // 收到多播信息后触发的事件 public event EventHandler<UdpPacketEventArgs> Received; private void OnReceived(IPEndPoint source, byte[] data) { var handler = Received; if (handler != null) handler(this, new UdpPacketEventArgs(data, source)); } // 加入多播组后触发的事件 public event EventHandler Opening; private void OnOpening() { var handler = Opening; if (handler != null) handler(this, EventArgs.Empty); } // 断开多播组后触发的事件 public event EventHandler Closing; private void OnClosing() { var handler = Closing; if (handler != null) handler(this, EventArgs.Empty); } /// <summary> /// 加入多播组 /// </summary> public void Open() { if (!_isJoined) { _client.BeginJoinGroup( result => { _client.EndJoinGroup(result); _isJoined = true; Deployment.Current.Dispatcher.BeginInvoke( () => { OnOpening(); Receive(); }); }, null); } } /// <summary> /// 发送信息到多播组，即发送信息到多播组内的所有成员 /// </summary> public void Send(string msg) { if (_isJoined) { byte[] data = Encoding.UTF8.GetBytes(msg); _client.BeginSendToGroup(data, 0, data.Length, result => { _client.EndSendToGroup(result); }, null); } } /// <summary> /// 从多播组接收信息，即接收多播组内所有成员发送的信息 /// </summary> private void Receive() { if (_isJoined) { Array.Clear(_buffer, 0, _buffer.Length); _client.BeginReceiveFromGroup(_buffer, 0, _buffer.Length, result => { IPEndPoint source; _client.EndReceiveFromGroup(result, out source); Deployment.Current.Dispatcher.BeginInvoke( () => { OnReceived(source, _buffer); Receive(); }); }, null); } } // 关闭 ASM 信道 public void Close() { _isJoined = false; OnClosing(); Dispose(); } public void Dispose() { if (_client != null) _client.Dispose(); } } }
演示 ASM
AnySourceMulticast.xaml
<phone:PhoneApplicationPage x:Class="Demo.Communication.SocketClient.AnySourceMulticast" 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"> <ListBox Name="lstAllMsg" MaxHeight="400" /> <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>
AnySourceMulticast.xaml.cs
/* * 用于演示 ASM */ 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.Windows.Navigation; namespace Demo.Communication.SocketClient { public partial class AnySourceMulticast : PhoneApplicationPage { // 实例化自定义的 ASM 信道 private UdpAnySourceMulticastChannel _channel; public AnySourceMulticast() { InitializeComponent(); } protected override void OnNavigatedTo(NavigationEventArgs e) { txtName.Text = "匿名" + new Random().Next(1000, 9999).ToString(); // 多播组地址是必须介于 224.0.0.0 到 239.255.255.255 之间的 IP 地址，其中范围介于 224.0.0.0 到 224.0.0.255 之间的多播地址是保留多播地址 // 比如：224.0.0.0 是基址，224.0.0.1 是代表同一个物理网络中所有系统的多播组地址，而 224.0.0.2 代表同一个物理网络中的所有路由器 _channel = new UdpAnySourceMulticastChannel(IPAddress.Parse("224.0.1.1"), 3368, 2048); _channel.Opening += new EventHandler(_channel_Opening); _channel.Received += new EventHandler<UdpPacketEventArgs>(_channel_Received); _channel.Closing += new EventHandler(_channel_Closing); _channel.Open(); // 需要的使用，应该调用 Close() // _channel.Close(); } void _channel_Opening(object sender, EventArgs e) { _channel.Send(string.Format("{0}: 进来了 - [{1}]", txtName.Text, DateTime.Now.ToString("HH:mm:ss"))); } void _channel_Received(object sender, UdpPacketEventArgs e) { // 因为已经指定了接收信息的缓冲区大小是 2048 ，所以如果信息不够 2048 个字节的的话，空白处均为空字节“\0” string message = string.Format("{0} - 来自：{1}", e.Message.TrimEnd('\0'), e.Source.ToString()); lstAllMsg.Items.Insert(0, message); } void _channel_Closing(object sender, EventArgs e) { _channel.Send(string.Format("{0}: 离开了 - [{1}]", txtName.Text, DateTime.Now.ToString("HH:mm:ss"))); } private void btnSend_Click(object sender, RoutedEventArgs e) { SendMsg(); } private void txtInput_KeyDown(object sender, KeyEventArgs e) { if (e.Key == Key.Enter) { SendMsg(); this.Focus(); } } private void SendMsg() { _channel.Send(string.Format("{0}: {1} - [{2}]", txtName.Text, txtInput.Text, DateTime.Now.ToString("HH:mm:ss"))); txtInput.Text = ""; } } }
OK
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