与众不同 windows phone (32) - Communication（通信）之任意源组播 ASM（Any Source Multicast）

[索引页]
[源码下载]

[align=center]与众不同 windows phone (32) - Communication（通信）之任意源组播 ASM（Any Source Multicast）[/align]

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
[源码下载]