MulticastOption Classe

Definição

Namespace:

System.Net.Sockets

Assembly:

System.Net.Sockets.dll

Origem:

MulticastOption.cs

Contém valores IPAddress usados para unir e soltar grupos de multicast.

C#

public class MulticastOption

Herança

Object

MulticastOption

Exemplos

Os exemplos a seguir unem a interface IP padrão a um grupo de multicast de IP. Eles pressupõem o endereço do grupo de multicast ip no intervalo de 224.0.0.0 a 239.255.255.255.

C#

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

// This is the listener example that shows how to use the MulticastOption class.
// In particular, it shows how to use the MulticastOption(IPAddress, IPAddress)
// constructor, which you need to use if you have a host with more than one
// network card.
// The first parameter specifies the multicast group address, and the second
// specifies the local address of the network card you want to use for the data
// exchange.
// You must run this program in conjunction with the sender program as
// follows:
// Open a console window and run the listener from the command line.
// In another console window run the sender. In both cases you must specify
// the local IPAddress to use. To obtain this address run the ipconfig command
// from the command line.
//
namespace Mssc.TransportProtocols.Utilities
{
    public class TestMulticastOption
    {
        private static IPAddress s_mcastAddress;
        private static int s_mcastPort;
        private static Socket s_mcastSocket;
        private static MulticastOption s_mcastOption;

        private static void MulticastOptionProperties()
        {
            Console.WriteLine("Current multicast group is: " + s_mcastOption.Group);
            Console.WriteLine("Current multicast local address is: " + s_mcastOption.LocalAddress);
        }

        private static void StartMulticast()
        {
            try
            {
                s_mcastSocket = new Socket(AddressFamily.InterNetwork,
                                         SocketType.Dgram,
                                         ProtocolType.Udp);

                Console.Write("Enter the local IP address: ");

                IPAddress localIPAddr = IPAddress.Parse(Console.ReadLine());

                //IPAddress localIP = IPAddress.Any;
                EndPoint localEP = (EndPoint)new IPEndPoint(localIPAddr, s_mcastPort);

                s_mcastSocket.Bind(localEP);


                // Define a MulticastOption object specifying the multicast group
                // address and the local IPAddress.
                // The multicast group address is the same as the address used by the server.
                s_mcastOption = new MulticastOption(s_mcastAddress, localIPAddr);

                s_mcastSocket.SetSocketOption(SocketOptionLevel.IP,
                                            SocketOptionName.AddMembership,
                                            s_mcastOption);
            }

            catch (Exception e)
            {
                Console.WriteLine(e.ToString());
            }
        }

        private static void ReceiveBroadcastMessages()
        {
            bool done = false;
            byte[] bytes = new byte[100];
            IPEndPoint groupEP = new(s_mcastAddress, s_mcastPort);
            EndPoint remoteEP = (EndPoint)new IPEndPoint(IPAddress.Any, 0);

            try
            {
                while (!done)
                {
                    Console.WriteLine("Waiting for multicast packets.......");
                    Console.WriteLine("Enter ^C to terminate.");

                    s_mcastSocket.ReceiveFrom(bytes, ref remoteEP);

                    Console.WriteLine("Received broadcast from {0} :\n {1}\n",
                      groupEP.ToString(),
                      Encoding.ASCII.GetString(bytes, 0, bytes.Length));
                }

                s_mcastSocket.Close();
            }

            catch (Exception e)
            {
                Console.WriteLine(e.ToString());
            }
        }

        public static void Main(string[] args)
        {
            // Initialize the multicast address group and multicast port.
            // Both address and port are selected from the allowed sets as
            // defined in the related RFC documents. These are the same
            // as the values used by the sender.
            s_mcastAddress = IPAddress.Parse("224.168.100.2");
            s_mcastPort = 11000;

            // Start a multicast group.
            StartMulticast();

            // Display MulticastOption properties.
            MulticastOptionProperties();

            // Receive broadcast messages.
            ReceiveBroadcastMessages();
        }
    }
}

C#

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

// This sender example must be used in conjunction with the listener program.
// You must run this program as follows:
// Open a console window and run the listener from the command line.
// In another console window run the sender. In both cases you must specify
// the local IPAddress to use. To obtain this address,  run the ipconfig command
// from the command line.
//
namespace Mssc.TransportProtocols.Utilities
{
    class TestMulticastOption2
    {
        static IPAddress s_mcastAddress;
        static int s_mcastPort;
        static Socket s_mcastSocket;

        static void JoinMulticastGroup()
        {
            try
            {
                // Create a multicast socket.
                s_mcastSocket = new Socket(AddressFamily.InterNetwork,
                                         SocketType.Dgram,
                                         ProtocolType.Udp);

                // Get the local IP address used by the listener and the sender to
                // exchange multicast messages.
                Console.Write("\nEnter local IPAddress for sending multicast packets: ");
                IPAddress localIPAddr = IPAddress.Parse(Console.ReadLine());

                // Create an IPEndPoint object.
                IPEndPoint IPlocal = new IPEndPoint(localIPAddr, 0);

                // Bind this endpoint to the multicast socket.
                s_mcastSocket.Bind(IPlocal);

                // Define a MulticastOption object specifying the multicast group
                // address and the local IP address.
                // The multicast group address is the same as the address used by the listener.
                MulticastOption mcastOption;
                mcastOption = new MulticastOption(s_mcastAddress, localIPAddr);

                s_mcastSocket.SetSocketOption(SocketOptionLevel.IP,
                                            SocketOptionName.AddMembership,
                                            mcastOption);
            }
            catch (Exception e)
            {
                Console.WriteLine("\n" + e.ToString());
            }
        }

        static void BroadcastMessage(string message)
        {
            IPEndPoint endPoint;

            try
            {
                //Send multicast packets to the listener.
                endPoint = new IPEndPoint(s_mcastAddress, s_mcastPort);
                s_mcastSocket.SendTo(ASCIIEncoding.ASCII.GetBytes(message), endPoint);
                Console.WriteLine("Multicast data sent.....");
            }
            catch (Exception e)
            {
                Console.WriteLine("\n" + e.ToString());
            }

            s_mcastSocket.Close();
        }

        static void Main(string[] args)
        {
            // Initialize the multicast address group and multicast port.
            // Both address and port are selected from the allowed sets as
            // defined in the related RFC documents. These are the same
            // as the values used by the sender.
            s_mcastAddress = IPAddress.Parse("224.168.100.2");
            s_mcastPort = 11000;

            // Join the listener multicast group.
            JoinMulticastGroup();

            // Broadcast the message to the listener.
            BroadcastMessage("Hello multicast listener.");
        }
    }
}

Comentários

Use um MulticastOption para armazenar o IPAddress de um grupo multicast que você deseja unir ou remover. Use o Socket.SetSocketOption método com os parâmetros a seguir para unir um grupo multicast.

Parâmetro	Valor
Socketoptionlevel	SocketOptionLevel.Udp
Socketoptionname	AddMembership
objeto	MulticastOption

Use DropMembership para remover um grupo multicast.

Construtores

MulticastOption(IPAddress)	Inicializa uma nova versão da classe MulticastOption para o grupo de multicast do IP especificado.
MulticastOption(IPAddress, Int32)	Inicializa uma nova instância da classe MulticastOption com o endereço de grupo de multicast IP e índice de interface especificados.
MulticastOption(IPAddress, IPAddress)	Inicializa uma nova instância da classe MulticastOption com o endereço de grupo de multicast IP especificado e o endereço IP local associado a um adaptador de rede.

Propriedades

Group	Obtém ou define o endereço IP de um grupo de multicast.
InterfaceIndex	Obtém ou define o índice da interface usada para enviar e receber pacotes multicast.
LocalAddress	Obtém ou define o endereço local associado a um grupo de multicast.

Métodos

Equals(Object)	Determina se o objeto especificado é igual ao objeto atual. (Herdado de Object)
GetHashCode()	Serve como a função de hash padrão. (Herdado de Object)
GetType()	Obtém o Type da instância atual. (Herdado de Object)
MemberwiseClone()	Cria uma cópia superficial do Object atual. (Herdado de Object)
ToString()	Retorna uma cadeia de caracteres que representa o objeto atual. (Herdado de Object)

Aplica-se a