udp单播,广播,多播实现(ReceiveFromAsync,SendToAsync)

注意:客户端和服务器实现基本一致,本地host和port和多播的host和port可以一样

(1)多播

1.将本地host加入多播组中,只有加入多播组的成员才能接受同组的节点发送的多播

MulticastOption mcastOption = new MulticastOption(IPAddress.Parse(MultiCastHost), IPAddress.Parse(localHost));
socket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.AddMembership, mcastOption);

2.将本地host移出多播组中

socket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.DropMembership, mcastOption);

3.多播生存时间 millisecond

socket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.MulticastTimeToLive, 10);

 

发送信息指定MultiCastHost发送

 (2)广播

开启广播

socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Broadcast, true);

 发送信息指定255.255.255.255发送

 

参考:MSDN

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public class UdpServiceSocket
{
    private readonly string broadCastHost = "255.255.255.255";
 
    //接收数据事件
    public Action<string> recvMessageEvent = null;
    //发送结果事件
    public Action<int> sendResultEvent = null;
 
    //接收缓存数组
    private byte[] recvBuff = null;
    //发送缓存数组
    private byte[] sendBuff = null;
    //用于发送数据的SocketAsyncEventArgs
    private SocketAsyncEventArgs sendEventArg = null;
    //用于接收数据的SocketAsyncEventArgs
    private SocketAsyncEventArgs recvEventArg = null;
    //监听socket
    private Socket socket = null;
    //用于socket发送和接收的缓存区大小
    private int bufferSize = 1024;
    //udp服务器绑定地址
    private string localHost = "";
    //udp服务器监听端口
    private int localPort = 0;
    //udp广播组地址
    private string MultiCastHost = "";
    //udp广播组端口
    private int MultiCastPort = 0;
 
    /// <summary>
    /// 构造函数
    /// </summary>
    /// <param name="bufferSize">用于socket发送和接受的缓存区大小</param>
    public UdpServiceSocket()
    {
        //设置用于发送数据的SocketAsyncEventArgs
        sendBuff = new byte[bufferSize];
        sendEventArg = new SocketAsyncEventArgs();
        sendEventArg.Completed += new EventHandler<SocketAsyncEventArgs>(IO_Completed);
        sendEventArg.SetBuffer(sendBuff, 0, bufferSize);
        //设置用于接受数据的SocketAsyncEventArgs
        recvBuff = new byte[bufferSize];
        recvEventArg = new SocketAsyncEventArgs();
        recvEventArg.Completed += new EventHandler<SocketAsyncEventArgs>(IO_Completed);
        recvEventArg.SetBuffer(recvBuff, 0, bufferSize);
    }
 
    /// <summary>
    ///  开启udp服务器,等待udp客户端数据(设置广播)
    /// </summary>
    public void Start(string localHost, int localPort)
    {
        if (string.IsNullOrEmpty(localHost))
            throw new ArgumentNullException("localHost cannot be null");
        if (localPort < 1 || localPort > 65535)
            throw new ArgumentOutOfRangeException("localPort is out of range");
 
        this.localHost = localHost;
        this.localPort = localPort;
 
        try
        {
            socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
 
            //设置广播
            socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Broadcast, true);
 
            IPEndPoint endpoint = new IPEndPoint(IPAddress.Parse(localHost), localPort);
            socket.Bind(endpoint);//设置监听地址和端口
            StartRecvFrom();
        }
        catch (Exception ex)
        {
            throw ex;
        }
    }
 
    /// <summary>
    ///  开启udp服务器,等待udp客户端数据(设置多播,广播)
    /// </summary>
    /// <param name="ip"></param>
    /// <param name="port"></param>
    public void Start(string localHost, int localPort, string MultiCastHost, int MultiCastPort)
    {
        if (string.IsNullOrEmpty(localHost))
            throw new ArgumentNullException("localHost cannot be null");
        if (localPort < 1 || localPort > 65535)
            throw new ArgumentOutOfRangeException("localPort is out of range");
 
        if (string.IsNullOrEmpty(MultiCastHost))
            throw new ArgumentNullException("MultiCastHost cannot be null");
        if (MultiCastPort < 1 || MultiCastPort > 65535)
            throw new ArgumentOutOfRangeException("MultiCastPort is out of range");
 
        this.localHost = localHost;
        this.localPort = localPort;
        this.MultiCastHost = MultiCastHost;
        this.MultiCastPort = MultiCastPort;
 
        try
        {
            socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
 
            //设置广播
            socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Broadcast, true);
 
            //设置多播
            socket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.MulticastLoopback, true);
            MulticastOption mcastOption = new MulticastOption(IPAddress.Parse(MultiCastHost), IPAddress.Parse(localHost));
            socket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.AddMembership, mcastOption);
 
            IPEndPoint endpoint = new IPEndPoint(IPAddress.Parse(localHost), localPort);
            socket.Bind(endpoint);//设置监听地址和端口
            StartRecvFrom();
        }
        catch (Exception ex)
        {
            throw ex;
        }
    }
 
    /// <summary>
    /// 开始接受udp客户端发送的数据
    /// </summary>
    private void StartRecvFrom()
    {
        recvEventArg.RemoteEndPoint = new IPEndPoint(IPAddress.Any, 0);
        bool willRaiseEvent = socket.ReceiveFromAsync(recvEventArg);
        if (!willRaiseEvent)
        {
            ProcessReceive(recvEventArg);
        }
    }
 
    /// <summary>
    /// socket.sendAsync和socket.recvAsync的完成回调函数
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void IO_Completed(object sender, SocketAsyncEventArgs e)
    {
        switch (e.LastOperation)
        {
            case SocketAsyncOperation.ReceiveFrom:
                ProcessReceive(e);
                break;
            case SocketAsyncOperation.SendTo:
                ProcessSend(e);
                break;
            default:
                throw new ArgumentException("The last operation completed on the socket was not a receive or send");
        }
    }
 
    /// <summary>
    /// 处理接收到的udp客户端数据
    /// </summary>
    /// <param name="e"></param>
    private void ProcessReceive(SocketAsyncEventArgs e)
    {
        if (e.BytesTransferred > 0 && e.SocketError == SocketError.Success)
        {
            if (recvMessageEvent != null)
                //一定要指定GetString的长度
                recvMessageEvent(Encoding.UTF8.GetString(e.Buffer, e.Offset, e.BytesTransferred));
 
            StartRecvFrom();
        }
        else
        {
            Restart();
        }
    }
 
    /// <summary>
    /// 处理udp服务器发送的结果
    /// </summary>
    /// <param name="e"></param>
    private void ProcessSend(SocketAsyncEventArgs e)
    {
        AsyncUserToken token = (AsyncUserToken)e.UserToken;
        if (e.SocketError == SocketError.Success)
        {
            if (sendResultEvent != null)
                sendResultEvent(e.BytesTransferred);
        }
        else
        {
            if (sendResultEvent != null)
                sendResultEvent(e.BytesTransferred);
            Restart();
        }
    }
 
    /// <summary>
    /// 关闭udp服务器
    /// </summary>
    public void CloseSocket()
    {
        if (socket == null)
            return;
 
        try
        {
            socket.Shutdown(SocketShutdown.Both);
        }
        catch { }
 
        try
        {
            socket.Close();
        }
        catch { }
    }
 
    /// <summary>
    /// 重新启动udp服务器
    /// </summary>
    public void Restart()
    {
        CloseSocket();
        if (string.IsNullOrEmpty(MultiCastHost))
            Start(localHost, localPort, MultiCastHost, MultiCastPort);
        else
            Start(localHost, localPort);
    }
 
    /// <summary>
    /// 发送广播
    /// </summary>
    /// <param name="message"></param>
    public void SendMessageByBroadcast(string message)
    {
        if (socket == null)
            throw new ArgumentNullException("socket cannot be null");
        if (string.IsNullOrEmpty(message))
            throw new ArgumentNullException("message cannot be null");
 
        byte[] buff = Encoding.UTF8.GetBytes(message);
        if (buff.Length > bufferSize)
            throw new ArgumentOutOfRangeException("message is out off range");
 
        sendEventArg.RemoteEndPoint = new IPEndPoint(IPAddress.Parse(broadCastHost), localPort);
        buff.CopyTo(sendEventArg.Buffer, 0);
        sendEventArg.SetBuffer(0, buff.Length);
        bool willRaiseEvent = socket.SendToAsync(sendEventArg);
        if (!willRaiseEvent)
        {
            ProcessSend(sendEventArg);
        }
    }
 
    /// <summary>
    /// 发送单播
    /// </summary>
    /// <param name="message"></param>
    public void SendMessageByUnicast(string message, string destHost, int destPort)
    {
        if (socket == null)
            throw new ArgumentNullException("socket cannot be null");
        if (string.IsNullOrEmpty(message))
            throw new ArgumentNullException("message cannot be null");
        if (string.IsNullOrEmpty(destHost))
            throw new ArgumentNullException("destHost cannot be null");
        if (destPort < 1 || destPort > 65535)
            throw new ArgumentOutOfRangeException("destPort is out of range");
 
        byte[] buff = Encoding.UTF8.GetBytes(message);
        if (buff.Length > bufferSize)
            throw new ArgumentOutOfRangeException("message is out off range");
 
        sendEventArg.RemoteEndPoint = new IPEndPoint(IPAddress.Parse(destHost), destPort);
        buff.CopyTo(sendEventArg.Buffer, 0);
        sendEventArg.SetBuffer(0, buff.Length);
        bool willRaiseEvent = socket.SendToAsync(sendEventArg);
        if (!willRaiseEvent)
        {
            ProcessSend(sendEventArg);
        }
    }
 
    /// <summary>
    /// 发送组播(多播)
    /// </summary>
    /// <param name="message"></param>
    public void SendMessageByMulticast(string message)
    {
        if (socket == null)
            throw new ArgumentNullException("socket cannot be null");
        if (string.IsNullOrEmpty(message))
            throw new ArgumentNullException("message cannot be null");
        if (string.IsNullOrEmpty(MultiCastHost))
            throw new ArgumentNullException("MultiCastHost cannot be null");
        if (MultiCastPort < 1 || MultiCastPort > 65535)
            throw new ArgumentOutOfRangeException("MultiCastPort is out of range");
 
        byte[] buff = Encoding.UTF8.GetBytes(message);
        if (buff.Length > bufferSize)
            throw new ArgumentOutOfRangeException("message is out off range");
 
        sendEventArg.RemoteEndPoint = new IPEndPoint(IPAddress.Parse(MultiCastHost), MultiCastPort);
        buff.CopyTo(sendEventArg.Buffer, 0);
        sendEventArg.SetBuffer(0, buff.Length);
        bool willRaiseEvent = socket.SendToAsync(sendEventArg);
        if (!willRaiseEvent)
        {
            ProcessSend(sendEventArg);
        }
    }
}

  

 

 

 

  

posted @   翻白眼的哈士奇  阅读(2427)  评论(0编辑  收藏  举报
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