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UdpClient.JoinMulticastGroup Método

  • Referencia

Definición

Espacio de nombres:
System.Net.Sockets
Ensamblado:
System.Net.Sockets.dll
Ensamblado:
System.dll
Ensamblado:
netstandard.dll

Agrega una clase UdpClient a un grupo de multidifusión.

Sobrecargas

JoinMulticastGroup(IPAddress)

Agrega una clase UdpClient a un grupo de multidifusión.
JoinMulticastGroup(Int32, IPAddress)

Agrega una clase UdpClient a un grupo de multidifusión.
JoinMulticastGroup(IPAddress, Int32)

Agrega una clase UdpClient a un grupo de multidifusión con el período de vida (TTL) especificado.
JoinMulticastGroup(IPAddress, IPAddress)

Agrega una clase UdpClient a un grupo de multidifusión.

JoinMulticastGroup(IPAddress)

Source:
UDPClient.cs
Source:
UDPClient.cs
Source:
UDPClient.cs

Agrega una clase UdpClient a un grupo de multidifusión.

public:
 void JoinMulticastGroup(System::Net::IPAddress ^ multicastAddr);
public void JoinMulticastGroup (System.Net.IPAddress multicastAddr);
member this.JoinMulticastGroup : System.Net.IPAddress -> unit
Public Sub JoinMulticastGroup (multicastAddr As IPAddress)

Parámetros

multicastAddr
IPAddress

Clase IPAddress de multidifusión del grupo al que se piensa incorporar.

Excepciones

ObjectDisposedException

El objeto Socket subyacente se ha cerrado.

SocketException

Se produjo un error al acceder al socket.

ArgumentException

La dirección IP no es compatible con el valor de AddressFamily que define el esquema de direcciones del socket.

Ejemplos

En el ejemplo de código siguiente se muestra cómo unirse a un grupo de multidifusión proporcionando una dirección de multidifusión.

#using <System.dll>

using namespace System;
using namespace System::Net;
using namespace System::Net::Sockets;
using namespace System::Text;
using namespace System::IO;
using namespace System::Threading;

// The following Receive class is used by both the ClientOriginator and
// the ClientTarget class to receive data from one another..
public ref class Receive
{
public:

   // The following static method performs the actual data
   // exchange. In particular, it performs the following tasks:
   // 1)Establishes a communication endpoint.
   // 2)Receive data through this end point on behalf of the
   // caller.
   // 3) Returns the received data in ASCII format.
   static String^ ReceiveUntilStop( UdpClient^ c )
   {
      String^ strData = "";
      String^ Ret = "";
      ASCIIEncoding^ ASCII = gcnew ASCIIEncoding;
      
      // Establish the communication endpoint.
      IPEndPoint^ endpoint = gcnew IPEndPoint( IPAddress::IPv6Any,50 );
      while (  !strData->Equals( "Over" ) )
      {
         array<Byte>^data = c->Receive( endpoint );
         strData = ASCII->GetString( data );
         Ret = String::Concat( Ret, strData, "\n" );
      }

      return Ret;
   }

};


// The following Send class is used by both the ClientOriginator and
// ClientTarget classes to send data to one another.
public ref class Send
{
private:
   static array<Char>^greetings = {'H','e','l','l','o',' ','T','a','r','g','e','t','->'};
   static array<Char>^nice = {'H','a','v','e',' ','a',' ','n','i','c','e',' ','d','a','y','->'};
   static array<Char>^eom = {'O','v','e','r'};
   static array<Char>^tGreetings = {'H','e','l','l','o',' ','O','r','i','g','i','n','a','t','o','r','!'};
   static array<Char>^tNice = {'Y','o','u',' ','t','o','o','->'};

public:

   // The following static method sends data to the ClientTarget on
   // behalf of the ClientOriginator.
   static void OriginatorSendData( UdpClient^ c, IPEndPoint^ ep )
   {
      Console::WriteLine( gcnew String( greetings ) );
      c->Send( GetByteArray( greetings ), greetings->Length, ep );
      Thread::Sleep( 1000 );
      Console::WriteLine( gcnew String( nice ) );
      c->Send( GetByteArray( nice ), nice->Length, ep );
      Thread::Sleep( 1000 );
      Console::WriteLine( gcnew String( eom ) );
      c->Send( GetByteArray( eom ), eom->Length, ep );
   }


   // The following static method sends data to the ClientOriginator on
   // behalf of the ClientTarget.
   static void TargetSendData( UdpClient^ c, IPEndPoint^ ep )
   {
      Console::WriteLine( gcnew String( tGreetings ) );
      c->Send( GetByteArray( tGreetings ), tGreetings->Length, ep );
      Thread::Sleep( 1000 );
      Console::WriteLine( gcnew String( tNice ) );
      c->Send( GetByteArray( tNice ), tNice->Length, ep );
      Thread::Sleep( 1000 );
      Console::WriteLine( gcnew String( eom ) );
      c->Send( GetByteArray( eom ), eom->Length, ep );
   }


private:

   // Internal utility
   static array<Byte>^ GetByteArray( array<Char>^ChArray )
   {
      array<Byte>^Ret = gcnew array<Byte>(ChArray->Length);
      for ( int i = 0; i < ChArray->Length; i++ )
         Ret[ i ] = (Byte)ChArray[ i ];
      return Ret;
   }

};


// The ClientTarget class is the receiver of the ClientOriginator
// messages. The StartMulticastConversation method contains the
// logic for exchanging data between the ClientTarget and its
// counterpart ClientOriginator in a multicast operation.
public ref class ClientTarget
{
private:
   static UdpClient^ m_ClientTarget;
   static IPAddress^ m_GrpAddr;

public:

   // The following StartMulticastConversation method connects the UDP
   // ClientTarget with the ClientOriginator.
   // It performs the following main tasks:
   // 1)Creates a UDP client to receive data on a specific port and using
   // IPv6 addresses. The port is the same one used by the ClientOriginator
   // to define its communication endpoint.
   // 2)Joins or creates a multicast group at the specified address.
   // 3)Defines the endpoint port to send data to the ClientOriginator.
   // 4)Receives data from the ClientOriginator until the end of the
   // communication.
   // 5)Sends data to the ClientOriginator.
   // Note this method is the counterpart of the
   // ClientOriginator::ConnectOriginatorAndTarget().
   static void StartMulticastConversation()
   {
      String^ Ret;
      
      // Bind and listen on port 1000. Specify the IPv6 address family type.
      m_ClientTarget = gcnew UdpClient( 1000,AddressFamily::InterNetworkV6 );
      
      // Join or create a multicast group
      m_GrpAddr = IPAddress::Parse( "FF01::1" );
      
      // Use the overloaded JoinMulticastGroup method.
      // Refer to the ClientOriginator method to see how to use the other
      // methods.
      m_ClientTarget->JoinMulticastGroup( m_GrpAddr );
      
      // Define the endpoint data port. Note that this port number
      // must match the ClientOriginator UDP port number which is the
      // port on which the ClientOriginator is receiving data.
      IPEndPoint^ ClientOriginatordest = gcnew IPEndPoint( m_GrpAddr,2000 );
      
      // Receive data from the ClientOriginator.
      Ret = Receive::ReceiveUntilStop( m_ClientTarget );
      Console::WriteLine( "\nThe ClientTarget received: \n\n {0}\n", Ret );
      
      // Done receiving, now respond to the ClientOriginator.
      // Wait to make sure the ClientOriginator is ready to receive.
      Thread::Sleep( 2000 );
      Console::WriteLine( "\nThe ClientTarget sent:\n" );
      Send::TargetSendData( m_ClientTarget, ClientOriginatordest );
      
      // Exit the multicast conversation.
      m_ClientTarget->DropMulticastGroup( m_GrpAddr );
   }

};


// The following ClientOriginator class starts the multicast conversation
// with the ClientTarget class..
// It performs the following main tasks:
// 1)Creates a socket and binds it to the port on which to communicate.
// 2)Specifies that the connection must use an IPv6 address.
// 3)Joins or create a multicast group.
//   Note that the multicast address ranges to use are specified
//   in the RFC#2375.
// 4)Defines the endpoint to send the data to and starts the
// client target (ClientTarget) thread.
public ref class ClientOriginator
{
private:
   static UdpClient^ clientOriginator;
   static IPAddress^ m_GrpAddr;
   static IPEndPoint^ m_ClientTargetdest;
   static Thread^ m_t;

public:

   // The ConnectOriginatorAndTarget method connects the
   // ClientOriginator with the ClientTarget.
   // It performs the following main tasks:
   // 1)Creates a UDP client to receive data on a specific port
   //   using IPv6 addresses.
   // 2)Joins or create a multicast group at the specified address.
   // 3)Defines the endpoint port to send data to on the ClientTarget.
   // 4)Starts the ClientTarget thread that also creates the ClientTarget Object*.
   // Note this method is the counterpart of the
   // ClientTarget::StartMulticastConversation().
   static bool ConnectOriginatorAndTarget()
   {
      try
      {
         
         // Bind and listen on port 2000. This constructor creates a socket
         // and binds it to the port on which to receive data. The family
         // parameter specifies that this connection uses an IPv6 address.
         clientOriginator = gcnew UdpClient( 2000,AddressFamily::InterNetworkV6 );
         
         // Join or create a multicast group. The multicast address ranges
         // to use are specified in RFC#2375. You are free to use
         // different addresses.
         // Transform the String* address into the internal format.
         m_GrpAddr = IPAddress::Parse( "FF01::1" );
         
         // Display the multicast address used.
         Console::WriteLine( "Multicast Address: [ {0}]", m_GrpAddr );
         
         // Exercise the use of the IPv6MulticastOption.
         Console::WriteLine( "Instantiate IPv6MulticastOption(IPAddress)" );
         
         // Instantiate IPv6MulticastOption using one of the
         // overloaded constructors.
         IPv6MulticastOption^ ipv6MulticastOption = gcnew IPv6MulticastOption( m_GrpAddr );
         
         // Store the IPAdress multicast options.
         IPAddress^ group = ipv6MulticastOption->Group;
         __int64 interfaceIndex = ipv6MulticastOption->InterfaceIndex;
         
         // Display IPv6MulticastOption properties.
         Console::WriteLine( "IPv6MulticastOption::Group: [ {0}]", group );
         Console::WriteLine( "IPv6MulticastOption::InterfaceIndex: [ {0}]", interfaceIndex );
         
         // Instantiate IPv6MulticastOption using another
         // overloaded constructor.
         IPv6MulticastOption^ ipv6MulticastOption2 = gcnew IPv6MulticastOption( group,interfaceIndex );
         
         // Store the IPAdress multicast options.
         group = ipv6MulticastOption2->Group;
         interfaceIndex = ipv6MulticastOption2->InterfaceIndex;
         
         // Display the IPv6MulticastOption2 properties.
         Console::WriteLine( "IPv6MulticastOption::Group: [ {0} ]", group );
         Console::WriteLine( "IPv6MulticastOption::InterfaceIndex: [ {0} ]", interfaceIndex );
         
         // Join the specified multicast group using one of the
         // JoinMulticastGroup overloaded methods.
         clientOriginator->JoinMulticastGroup( (int)interfaceIndex, group );
         
         // Define the endpoint data port. Note that this port number
         // must match the ClientTarget UDP port number which is the
         // port on which the ClientTarget is receiving data.
         m_ClientTargetdest = gcnew IPEndPoint( m_GrpAddr,1000 );
         
         // Start the ClientTarget thread so it is ready to receive.
         m_t = gcnew Thread( gcnew ThreadStart( ClientTarget::StartMulticastConversation ) );
         m_t->Start();
         
         // Make sure that the thread has started.
         Thread::Sleep( 2000 );
         return true;
      }
      catch ( Exception^ e ) 
      {
         Console::WriteLine( "[ClientOriginator::ConnectClients] Exception: {0}", e );
         return false;
      }

   }


   // The SendAndReceive performs the data exchange
   // between the ClientOriginator and the ClientTarget classes.
   static String^ SendAndReceive()
   {
      String^ Ret = "";
      
      // Send data to ClientTarget.
      Console::WriteLine( "\nThe ClientOriginator sent:\n" );
      Send::OriginatorSendData( clientOriginator, m_ClientTargetdest );
      
      // Receive data from ClientTarget
      Ret = Receive::ReceiveUntilStop( clientOriginator );
      
      // Stop the ClientTarget thread
      m_t->Abort();
      
      // Abandon the multicast group.
      clientOriginator->DropMulticastGroup( m_GrpAddr );
      
      return Ret;
   }

};


//This is the console application entry point.
int main()
{
   
   // Join the multicast group.
   if ( ClientOriginator::ConnectOriginatorAndTarget() )
   {
      
      // Perform a multicast conversation with the ClientTarget.
      String^ Ret = ClientOriginator::SendAndReceive();
      Console::WriteLine( "\nThe ClientOriginator received: \n\n {0}", Ret );
   }
   else
   {
      Console::WriteLine( "Unable to Join the multicast group" );
   }
}

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

namespace Mssc.TransportProtocols.Utilities
{

  // The following Receive class is used by both the ClientOriginator and
  // the ClientTarget class to receive data from one another..
  public class Receive
  {
    // The following static method performs the actual data
    // exchange. In particular, it performs the following tasks:
    // 1)Establishes a communication endpoint.
    // 2)Receive data through this end point on behalf of the
    // caller.
    // 3) Returns the received data in ASCII format.
    public static string ReceiveUntilStop(UdpClient c)
    {
        String strData = "";
        String Ret = "";
        ASCIIEncoding ASCII = new ASCIIEncoding();

        // Establish the communication endpoint.
        IPEndPoint endpoint = new IPEndPoint(IPAddress.IPv6Any, 50);

        while (!strData.Equals("Over"))
        {
          Byte[] data = c.Receive(ref endpoint);
          strData = ASCII.GetString(data);
          Ret += strData  + "\n";
        }
        return Ret;
    }
  }

  // The following Send class is used by both the ClientOriginator and
  // ClientTarget classes to send data to one another.
  public class Send
  {
    private static char[] greetings = { 'H', 'e', 'l', 'l', 'o', ' ',
                                      'T', 'a', 'r', 'g', 'e', 't', '.' };
    private static char[] nice      = { 'H', 'a', 'v', 'e', ' ', 'a', ' ', 'n', 'i',
                                      'c', 'e', ' ', 'd', 'a', 'y', '.' };
    private static char [] eom      = { 'O', 'v', 'e', 'r'};

    private static char[] tGreetings = { 'H', 'e', 'l', 'l', 'o', ' ',
                                       'O', 'r', 'i', 'g', 'i', 'n', 'a', 't', 'o', 'r', '!' };
    private static char[] tNice  = { 'Y', 'o', 'u', ' ', 't', 'o', 'o', '.'};

    // The following static method sends data to the ClientTarget on
    // behalf of the ClientOriginator.
    public static void OriginatorSendData(UdpClient c, IPEndPoint ep)
    {
      Console.WriteLine(new string(greetings));
      c.Send(GetByteArray(greetings), greetings.Length, ep);
      Thread.Sleep(1000);

      Console.WriteLine(new String(nice));
      c.Send(GetByteArray(nice), nice.Length, ep);

      Thread.Sleep(1000);
      Console.WriteLine(new String(eom));
      c.Send(GetByteArray(eom), eom.Length, ep);
    }

    // The following static method sends data to the ClientOriginator on
    // behalf of the ClientTarget.
    public static void TargetSendData(UdpClient c, IPEndPoint ep)
    {
      Console.WriteLine(new string(tGreetings));
      c.Send(GetByteArray(tGreetings), tGreetings.Length, ep);
      Thread.Sleep(1000);

      Console.WriteLine(new String(tNice));
      c.Send(GetByteArray(tNice), tNice.Length, ep);

      Thread.Sleep(1000);
      Console.WriteLine(new String(eom));
      c.Send(GetByteArray(eom), eom.Length, ep);
    }
    // Internal utility
    private static Byte[] GetByteArray(Char[] ChArray)
    {
      Byte[] Ret = new Byte[ChArray.Length];
      for (int i = 0; i < ChArray.Length; i++)
        Ret[i] = (Byte) ChArray[i];
      return Ret;
    }
  }

  // The ClientTarget class is the receiver of the ClientOriginator
  // messages. The StartMulticastConversation method contains the
  // logic for exchanging data between the ClientTarget and its
  // counterpart ClientOriginator in a multicast operation.
  public class ClientTarget
  {
    private static UdpClient m_ClientTarget;
    private static IPAddress m_GrpAddr;

    // The following StartMulticastConversation method connects the UDP
    // ClientTarget with the ClientOriginator.
    // It performs the following main tasks:
    // 1)Creates a UDP client to receive data on a specific port and using
    // IPv6 addresses. The port is the same one used by the ClientOriginator
    // to define its communication endpoint.
    // 2)Joins or creates a multicast group at the specified address.
    // 3)Defines the endpoint port to send data to the ClientOriginator.
    // 4)Receives data from the ClientOriginator until the end of the
    // communication.
    // 5)Sends data to the ClientOriginator.
    // Note this method is the counterpart of the
    // ClientOriginator.ConnectOriginatorAndTarget().
    public static void StartMulticastConversation()
    {
      string Ret;

      // Bind and listen on port 1000. Specify the IPv6 address family type.
      m_ClientTarget = new UdpClient(1000, AddressFamily.InterNetworkV6);

      // Join or create a multicast group
      m_GrpAddr = IPAddress.Parse("FF01::1");

      // Use the overloaded JoinMulticastGroup method.
      // Refer to the ClientOriginator method to see how to use the other
      // methods.
      m_ClientTarget.JoinMulticastGroup(m_GrpAddr);

      // Define the endpoint data port. Note that this port number
      // must match the ClientOriginator UDP port number which is the
      // port on which the ClientOriginator is receiving data.
      IPEndPoint ClientOriginatordest = new IPEndPoint(m_GrpAddr, 2000);

      // Receive data from the ClientOriginator.
      Ret = Receive.ReceiveUntilStop(m_ClientTarget);
      Console.WriteLine("\nThe ClientTarget received: " + "\n\n" + Ret + "\n");

      // Done receiving, now respond to the ClientOriginator.

      // Wait to make sure the ClientOriginator is ready to receive.
      Thread.Sleep(2000);

      Console.WriteLine("\nThe ClientTarget sent:\n");

      Send.TargetSendData(m_ClientTarget, ClientOriginatordest);

      // Exit the multicast conversation.
      m_ClientTarget.DropMulticastGroup(m_GrpAddr);
    }
  }

  // The following ClientOriginator class starts the multicast conversation
  // with the ClientTarget class..
  // It performs the following main tasks:
  // 1)Creates a socket and binds it to the port on which to communicate.
  // 2)Specifies that the connection must use an IPv6 address.
  // 3)Joins or create a multicast group.
  //   Note that the multicast address ranges to use are specified
  //   in the RFC#2375.
  // 4)Defines the endpoint to send the data to and starts the
  // client target (ClientTarget) thread.
  public class ClientOriginator
  {
    private static UdpClient clientOriginator;
    private static IPAddress m_GrpAddr;
    private static IPEndPoint m_ClientTargetdest;
    private static Thread m_t;

    // The ConnectOriginatorAndTarget method connects the
    // ClientOriginator with the ClientTarget.
    // It performs the following main tasks:
    // 1)Creates a UDP client to receive data on a specific port
    //   using IPv6 addresses.
    // 2)Joins or create a multicast group at the specified address.
    // 3)Defines the endpoint port to send data to on the ClientTarget.
    // 4)Starts the ClientTarget thread that also creates the ClientTarget object.
    // Note this method is the counterpart of the
    // ClientTarget.StartMulticastConversation().
    public static bool ConnectOriginatorAndTarget()
    {
      try
      {

        // Bind and listen on port 2000. This constructor creates a socket
        // and binds it to the port on which to receive data. The family
        // parameter specifies that this connection uses an IPv6 address.
        clientOriginator = new UdpClient(2000, AddressFamily.InterNetworkV6);

        // Join or create a multicast group. The multicast address ranges
        // to use are specified in RFC#2375. You are free to use
        // different addresses.

        // Transform the string address into the internal format.
        m_GrpAddr = IPAddress.Parse("FF01::1");

        // Display the multicast address used.
        Console.WriteLine("Multicast Address: [" + m_GrpAddr.ToString() + "]");

        // Exercise the use of the IPv6MulticastOption.
        Console.WriteLine("Instantiate IPv6MulticastOption(IPAddress)");

        // Instantiate IPv6MulticastOption using one of the
        // overloaded constructors.
        IPv6MulticastOption ipv6MulticastOption = new IPv6MulticastOption(m_GrpAddr);

        // Store the IPAdress multicast options.
        IPAddress group =  ipv6MulticastOption.Group;
        long interfaceIndex = ipv6MulticastOption.InterfaceIndex;

        // Display IPv6MulticastOption properties.
        Console.WriteLine("IPv6MulticastOption.Group: [" + group  + "]");
        Console.WriteLine("IPv6MulticastOption.InterfaceIndex: [" + interfaceIndex + "]");



        // Instantiate IPv6MulticastOption using another
        // overloaded constructor.
        IPv6MulticastOption ipv6MulticastOption2 = new IPv6MulticastOption(group, interfaceIndex);

        // Store the IPAdress multicast options.
        group =  ipv6MulticastOption2.Group;
        interfaceIndex = ipv6MulticastOption2.InterfaceIndex;

        // Display the IPv6MulticastOption2 properties.
        Console.WriteLine("IPv6MulticastOption.Group: [" + group  + "]");
        Console.WriteLine("IPv6MulticastOption.InterfaceIndex: [" + interfaceIndex + "]");

        // Join the specified multicast group using one of the
        // JoinMulticastGroup overloaded methods.
        clientOriginator.JoinMulticastGroup((int)interfaceIndex, group);


        // Define the endpoint data port. Note that this port number
        // must match the ClientTarget UDP port number which is the
        // port on which the ClientTarget is receiving data.
        m_ClientTargetdest = new IPEndPoint(m_GrpAddr, 1000);


        // Start the ClientTarget thread so it is ready to receive.
        m_t = new Thread(new ThreadStart(ClientTarget.StartMulticastConversation));
        m_t.Start();

        // Make sure that the thread has started.
        Thread.Sleep(2000);

        return true;
      }
      catch (Exception e)
      {
        Console.WriteLine("[ClientOriginator.ConnectClients] Exception: " + e.ToString());
        return false;
      }
    }

    // The SendAndReceive performs the data exchange
    // between the ClientOriginator and the ClientTarget classes.
    public static string SendAndReceive()
    {
      string Ret = "";


      // Send data to ClientTarget.
      Console.WriteLine("\nThe ClientOriginator sent:\n");
      Send.OriginatorSendData(clientOriginator, m_ClientTargetdest);

      // Receive data from ClientTarget
      Ret = Receive.ReceiveUntilStop(clientOriginator);

      // Stop the ClientTarget thread
      m_t.Abort();

      // Abandon the multicast group.
      clientOriginator.DropMulticastGroup(m_GrpAddr);


      return Ret;
    }

    //This is the console application entry point.
    public static void Main()
    {
      // Join the multicast group.
      if (ConnectOriginatorAndTarget())
      {
        // Perform a multicast conversation with the ClientTarget.
        string Ret = SendAndReceive();
        Console.WriteLine("\nThe ClientOriginator received: " + "\n\n" + Ret);
      }
      else
      {
        Console.WriteLine("Unable to Join the multicast group");
      }
    }
}
}

Imports System.Net
Imports System.Net.Sockets
Imports System.Text
Imports System.IO
Imports System.Threading

' The following Receive class is used by both the ClientOriginator and 
' the ClientTarget class to receive data from one another..

Public Class Receive
   
   ' The following static method performs the actual data
   ' exchange. In particular, it performs the following tasks:
   ' 1)Establishes a communication endpoint.
   ' 2)Receive data through this end point on behalf of the
   ' caller.
   ' 3) Returns the received data in ASCII format.
   Public Shared Function ReceiveUntilStop(c As UdpClient) As String
      Dim strData As [String] = ""
      Dim Ret As [String] = ""
      Dim ASCII As New ASCIIEncoding()
      
      ' Establish the communication endpoint.
      Dim endpoint As New IPEndPoint(IPAddress.IPv6Any, 50)
      
      While Not strData.Equals("Over")
         Dim data As [Byte]() = c.Receive(endpoint)
         strData = ASCII.GetString(data)
         Ret += strData + ControlChars.Lf
      End While
      Return Ret
   End Function 'ReceiveUntilStop
End Class

' The following Send class is used by both the ClientOriginator and 
' ClientTarget classes to send data to one another.

Public Class Send
   Private Shared greetings As Char() =  {"H"c, "e"c, "l"c, "l"c, "o"c, " "c, "T"c, "a"c, "r"c, "g"c, "e"c, "t"c, "."c}
   Private Shared nice As Char() =  {"H"c, "a"c, "v"c, "e"c, " "c, "a"c, " "c, "n"c, "i"c, "c"c, "e"c, " "c, "d"c, "a"c, "y"c, "."c}
   Private Shared eom As Char() =  {"O"c, "v"c, "e"c, "r"c}
   
   Private Shared tGreetings As Char() =  {"H"c, "e"c, "l"c, "l"c, "o"c, " "c, "O"c, "r"c, "i"c, "g"c, "i"c, "n"c, "a"c, "t"c, "o"c, "r"c, "!"c}
   Private Shared tNice As Char() =  {"Y"c, "o"c, "u"c, " "c, "t"c, "o"c, "o"c, "."c}
   
   
   ' The following static method sends data to the ClientTarget on 
   ' behalf of the ClientOriginator.
   Public Shared Sub OriginatorSendData(c As UdpClient, ep As IPEndPoint)
      Console.WriteLine(New String(greetings))
      c.Send(GetByteArray(greetings), greetings.Length, ep)
      Thread.Sleep(1000)
      
      Console.WriteLine(New [String](nice))
      c.Send(GetByteArray(nice), nice.Length, ep)
      
      Thread.Sleep(1000)
      Console.WriteLine(New [String](eom))
      c.Send(GetByteArray(eom), eom.Length, ep)
   End Sub
   
   
   ' The following static method sends data to the ClientOriginator on 
   ' behalf of the ClientTarget.
   Public Shared Sub TargetSendData(c As UdpClient, ep As IPEndPoint)
      Console.WriteLine(New String(tGreetings))
      c.Send(GetByteArray(tGreetings), tGreetings.Length, ep)
      Thread.Sleep(1000)
      
      Console.WriteLine(New [String](tNice))
      c.Send(GetByteArray(tNice), tNice.Length, ep)
      
      Thread.Sleep(1000)
      Console.WriteLine(New [String](eom))
      c.Send(GetByteArray(eom), eom.Length, ep)
   End Sub
   
   ' Internal utility 
   Public Shared Function GetByteArray(ChArray() As [Char]) As [Byte]()
      Dim Ret(ChArray.Length) As [Byte]
      
      Dim i As Integer
      For i = 0 To ChArray.Length - 1
         Ret(i) = AscW(ChArray(i))
      Next i 
      Return Ret
   End Function 'GetByteArray

End Class


' The ClientTarget class is the receiver of the ClientOriginator 
' messages. The StartMulticastConversation method contains the 
' logic for exchanging data between the ClientTarget and its 
' counterpart ClientOriginator in a multicast operation.

Public Class ClientTarget
   Private Shared m_ClientTarget As UdpClient
   Private Shared m_GrpAddr As IPAddress
   
   
   ' The following StartMulticastConversation method connects the UDP 
   ' ClientTarget with the ClientOriginator. 
   ' It performs the following main tasks:
   ' 1)Creates a UDP client to receive data on a specific port and using 
   ' IPv6 addresses. The port is the same one used by the ClientOriginator 
   ' to define its communication endpoint.
   ' 2)Joins or creates a multicast group at the specified address.  
   ' 3)Defines the endpoint port to send data to the ClientOriginator.
   ' 4)Receives data from the ClientOriginator until the end of the 
   ' communication.
   ' 5)Sends data to the ClientOriginator.
   ' Note this method is the counterpart of the 
   ' ClientOriginator.ConnectOriginatorAndTarget().
   Public Shared Sub StartMulticastConversation()
      Dim Ret As String
      
      ' Bind and listen on port 1000. Specify the IPv6 address family type.
      m_ClientTarget = New UdpClient(1000, AddressFamily.InterNetworkV6)
      
      ' Join or create a multicast group
      m_GrpAddr = IPAddress.Parse("FF01::1")
      
      ' Use the overloaded JoinMulticastGroup method.  
      ' Refer to the ClientOriginator method to see how to use the other 
      ' methods.
      m_ClientTarget.JoinMulticastGroup(m_GrpAddr)
      
      ' Define the endpoint data port. Note that this port number
      ' must match the ClientOriginator UDP port number which is the
      ' port on which the ClientOriginator is receiving data.
      Dim ClientOriginatordest As New IPEndPoint(m_GrpAddr, 2000)
      
      ' Receive data from the ClientOriginator.
      Ret = Receive.ReceiveUntilStop(m_ClientTarget)
      Console.WriteLine((ControlChars.Lf + "The ClientTarget received: " + ControlChars.Lf + ControlChars.Lf + Ret + ControlChars.Lf))
      
      ' Done receiving, now respond to the ClientOriginator.
      ' Wait to make sure the ClientOriginator is ready to receive.
      Thread.Sleep(2000)
      
      Console.WriteLine(ControlChars.Lf + "The ClientTarget sent:" + ControlChars.Lf)
      
      Send.TargetSendData(m_ClientTarget, ClientOriginatordest)
      
      ' Exit the multicast conversation. 
      m_ClientTarget.DropMulticastGroup(m_GrpAddr)
   End Sub
End Class


' The following ClientOriginator class starts the multicast conversation
' with the ClientTarget class.. 
' It performs the following main tasks:
' 1)Creates a socket and binds it to the port on which to communicate.
' 2)Specifies that the connection must use an IPv6 address.
' 3)Joins or create a multicast group. 
'   Note that the multicast address ranges to use are specified 
'   in the RFC#2375. 
' 4)Defines the endpoint to send the data to and starts the 
' client target (ClientTarget) thread.

Public Class ClientOriginator
   Private Shared clientOriginator As UdpClient
   Private Shared m_GrpAddr As IPAddress
   Private Shared m_ClientTargetdest As IPEndPoint
   Private Shared m_t As Thread
   
   
   ' The ConnectOriginatorAndTarget method connects the 
   ' ClientOriginator with the ClientTarget.
   ' It performs the following main tasks:
   ' 1)Creates a UDP client to receive data on a specific port 
   '   using IPv6 addresses. 
   ' 2)Joins or create a multicast group at the specified address.  
   ' 3)Defines the endpoint port to send data to on the ClientTarget.
   ' 4)Starts the ClientTarget thread that also creates the ClientTarget object.
   ' Note this method is the counterpart of the 
   ' ClientTarget.StartMulticastConversation().
   Public Shared Function ConnectOriginatorAndTarget() As Boolean
      Try
         ' Bind and listen on port 2000. This constructor creates a socket 
         ' and binds it to the port on which to receive data. The family 
         ' parameter specifies that this connection uses an IPv6 address.
         clientOriginator = New UdpClient(2000, AddressFamily.InterNetworkV6)
         
         ' Join or create a multicast group. The multicast address ranges 
         ' to use are specified in RFC#2375. You are free to use 
         ' different addresses.
         ' Transform the string address into the internal format.
         m_GrpAddr = IPAddress.Parse("FF01::1")
         
         ' Display the multicast address used.
         Console.WriteLine(("Multicast Address: [" + m_GrpAddr.ToString() + "]"))
         
         ' Exercise the use of the IPv6MulticastOption.
         Console.WriteLine("Instantiate IPv6MulticastOption(IPAddress)")
         
         ' Instantiate IPv6MulticastOption using one of the 
         ' overloaded constructors.
         Dim ipv6MulticastOption As New IPv6MulticastOption(m_GrpAddr)
         
         ' Store the IPAdress multicast options.
         Dim group As IPAddress = ipv6MulticastOption.Group
         Dim interfaceIndex As Long = ipv6MulticastOption.InterfaceIndex
         
         ' Display IPv6MulticastOption properties.
         Console.WriteLine(("IPv6MulticastOption.Group: [" + group.ToString() + "]"))
         Console.WriteLine(("IPv6MulticastOption.InterfaceIndex: [" + interfaceIndex.ToString() + "]"))
         
         ' Instantiate IPv6MulticastOption using another 
         ' overloaded constructor.
         Dim ipv6MulticastOption2 As New IPv6MulticastOption(group, interfaceIndex)
         
         ' Store the IPAdress multicast options.
         group = ipv6MulticastOption2.Group
         interfaceIndex = ipv6MulticastOption2.InterfaceIndex
         
         ' Display the IPv6MulticastOption2 properties.
         Console.WriteLine(("IPv6MulticastOption.Group: [" + group.ToString() + "]"))
         Console.WriteLine(("IPv6MulticastOption.InterfaceIndex: [" + interfaceIndex.ToString() + "]"))
         
         ' Join the specified multicast group using one of the 
         ' JoinMulticastGroup overloaded methods.
         clientOriginator.JoinMulticastGroup(Fix(interfaceIndex), group)
         
         ' Define the endpoint data port. Note that this port number
         ' must match the ClientTarget UDP port number which is the
         ' port on which the ClientTarget is receiving data.
         m_ClientTargetdest = New IPEndPoint(m_GrpAddr, 1000)
         
         ' Start the ClientTarget thread so it is ready to receive.
         m_t = New Thread(New ThreadStart(AddressOf ClientTarget.StartMulticastConversation))
         m_t.Start()
         
         ' Make sure that the thread has started.
         Thread.Sleep(2000)
         
         Return True
      Catch e As Exception
         Console.WriteLine(("[ClientOriginator.ConnectClients] Exception: " + e.ToString()))
         Return False
      End Try
   End Function 'ConnectOriginatorAndTarget
   
   
   ' The SendAndReceive performs the data exchange  
   ' between the ClientOriginator and the ClientTarget classes.
   Public Shared Function SendAndReceive() As String
      Dim Ret As String = ""
      
      ' Send data to ClientTarget.
      Console.WriteLine(ControlChars.Lf + "The ClientOriginator sent:" + ControlChars.Lf)
      Send.OriginatorSendData(clientOriginator, m_ClientTargetdest)
      
      ' Receive data from ClientTarget
      Ret = Receive.ReceiveUntilStop(clientOriginator)
      
      ' Stop the ClientTarget thread
      m_t.Abort()
      
      ' Abandon the multicast group.
      clientOriginator.DropMulticastGroup(m_GrpAddr)
      
      Return Ret
   End Function 'SendAndReceive
   
   
   'This is the console application entry point.
   Public Shared Sub Main()
      ' Join the multicast group.
      If ConnectOriginatorAndTarget() Then
         ' Perform a multicast conversation with the ClientTarget.
         Dim Ret As String = SendAndReceive()
         Console.WriteLine((ControlChars.Lf + "The ClientOriginator received: " + ControlChars.Lf + ControlChars.Lf + Ret))
      Else
         Console.WriteLine("Unable to Join the multicast group")
      End If
   End Sub
End Class

Comentarios

El JoinMulticastGroup método suscribe a UdpClient un grupo de multidifusión mediante el especificado IPAddress. Después de llamar al JoinMulticastGroup método , el subyacente Socket envía un paquete del Protocolo de administración de grupos de Internet (IGMP) al enrutador que solicita pertenencia al grupo de multidifusión. El intervalo de direcciones de multidifusión es de 224.0.0.0 a 239.255.255.255. Si especifica una dirección fuera de este intervalo o si el enrutador al que se realiza la solicitud no está habilitada la multidifusión, UdpClient producirá un SocketException. Si recibe un SocketException, use SocketException.ErrorCode para obtener el código de error específico. Una vez que haya obtenido este código, puede consultar la documentación del código de error de la API de Windows Sockets versión 2 para obtener una descripción detallada del error. Una vez que el UdpClient elemento aparece con el enrutador como miembro del grupo de multidifusión, podrá recibir datagramas multidifusión enviados al especificado IPAddress.

Nota

Debe crear mediante UdpClient el número de puerto de multidifusión; de lo contrario, no podrá recibir datagramas multidifusión. No llame al Connect método antes de llamar al JoinMulticastGroup método o el Receive método no funcionará. No es necesario pertenecer a un grupo de multidifusión para enviar datagramas a una dirección IP de multidifusión.

Antes de unir un grupo de multidifusión, asegúrese de que el socket esté enlazado al puerto o al punto de conexión. Para ello, debe llamar a uno de los constructores que aceptan un puerto o un punto de conexión como parámetro.

Para dejar de recibir datagramas multidifusión, llame al DropMulticastGroup método y proporcione el IPAddress del grupo desde el que desea retirar.

Nota

En el caso de IPv6, hay varios intervalos de direcciones de multidifusión entre los que puede elegir. Por favor, consulte el RFC 2375 de IETF.

Nota

No se puede llamar JoinMulticastGroup a en un UdpClient construido sin un puerto local específico (es decir, mediante el UdpClient() constructor o UdpClient(AddressFamily) ).

Consulte también

Se aplica a

JoinMulticastGroup(Int32, IPAddress)

Source:
UDPClient.cs
Source:
UDPClient.cs
Source:
UDPClient.cs

Agrega una clase UdpClient a un grupo de multidifusión.

public:
 void JoinMulticastGroup(int ifindex, System::Net::IPAddress ^ multicastAddr);
public void JoinMulticastGroup (int ifindex, System.Net.IPAddress multicastAddr);
member this.JoinMulticastGroup : int * System.Net.IPAddress -> unit
Public Sub JoinMulticastGroup (ifindex As Integer, multicastAddr As IPAddress)

Parámetros

ifindex
Int32

Índice de interfaz asociado a la dirección IP local donde se va unir al grupo de multidifusión.

multicastAddr
IPAddress

Clase IPAddress de multidifusión del grupo al que se piensa incorporar.

Excepciones

ObjectDisposedException

El objeto Socket subyacente se ha cerrado.

SocketException

Se produjo un error al acceder al socket.

Ejemplos

// Instantiate IPv6MulticastOption using another
// overloaded constructor.
IPv6MulticastOption^ ipv6MulticastOption2 = gcnew IPv6MulticastOption( group,interfaceIndex );

// Store the IPAdress multicast options.
group = ipv6MulticastOption2->Group;
interfaceIndex = ipv6MulticastOption2->InterfaceIndex;

// Display the IPv6MulticastOption2 properties.
Console::WriteLine( "IPv6MulticastOption::Group: [ {0} ]", group );
Console::WriteLine( "IPv6MulticastOption::InterfaceIndex: [ {0} ]", interfaceIndex );

// Join the specified multicast group using one of the
// JoinMulticastGroup overloaded methods.
clientOriginator->JoinMulticastGroup( (int)interfaceIndex, group );


// Instantiate IPv6MulticastOption using another
// overloaded constructor.
IPv6MulticastOption ipv6MulticastOption2 = new IPv6MulticastOption(group, interfaceIndex);

// Store the IPAdress multicast options.
group =  ipv6MulticastOption2.Group;
interfaceIndex = ipv6MulticastOption2.InterfaceIndex;

// Display the IPv6MulticastOption2 properties.
Console.WriteLine("IPv6MulticastOption.Group: [" + group  + "]");
Console.WriteLine("IPv6MulticastOption.InterfaceIndex: [" + interfaceIndex + "]");

// Join the specified multicast group using one of the
// JoinMulticastGroup overloaded methods.
clientOriginator.JoinMulticastGroup((int)interfaceIndex, group);

' Instantiate IPv6MulticastOption using another 
' overloaded constructor.
Dim ipv6MulticastOption2 As New IPv6MulticastOption(group, interfaceIndex)

' Store the IPAdress multicast options.
group = ipv6MulticastOption2.Group
interfaceIndex = ipv6MulticastOption2.InterfaceIndex

' Display the IPv6MulticastOption2 properties.
Console.WriteLine(("IPv6MulticastOption.Group: [" + group.ToString() + "]"))
Console.WriteLine(("IPv6MulticastOption.InterfaceIndex: [" + interfaceIndex.ToString() + "]"))

' Join the specified multicast group using one of the 
' JoinMulticastGroup overloaded methods.
clientOriginator.JoinMulticastGroup(Fix(interfaceIndex), group)

Comentarios

Antes de unir un grupo de multidifusión, asegúrese de que el socket esté enlazado al puerto o al punto de conexión. Para ello, llame a uno de los constructores que acepte un puerto o un punto de conexión como parámetro.

El infindex parámetro se usa para identificar una interfaz de hardware en el mismo vínculo.

Nota

Hay varios intervalos de direcciones de multidifusión entre los que elegir. Consulte el RFC 2375 de IETF.

Nota

No se puede llamar JoinMulticastGroup a en un UdpClient construido sin un puerto local específico (es decir, mediante el UdpClient.UdpClient() constructor o UdpClient.UdpClient(AddressFamily) ).

Se aplica a

JoinMulticastGroup(IPAddress, Int32)

Source:
UDPClient.cs
Source:
UDPClient.cs
Source:
UDPClient.cs

Agrega una clase UdpClient a un grupo de multidifusión con el período de vida (TTL) especificado.

public:
 void JoinMulticastGroup(System::Net::IPAddress ^ multicastAddr, int timeToLive);
public void JoinMulticastGroup (System.Net.IPAddress multicastAddr, int timeToLive);
member this.JoinMulticastGroup : System.Net.IPAddress * int -> unit
Public Sub JoinMulticastGroup (multicastAddr As IPAddress, timeToLive As Integer)

Parámetros

multicastAddr
IPAddress

Clase IPAddress del grupo de multidifusión que se piensa incorporar.

timeToLive
Int32

Período de vida, medido en saltos del enrutador.

Excepciones

ArgumentOutOfRangeException

El TTL proporcionado no se encuentra entre 0 y 255.

ObjectDisposedException

El objeto Socket subyacente se ha cerrado.

SocketException

Se produjo un error al acceder al socket.

ArgumentNullException

multicastAddr es null.

ArgumentException

La dirección IP no es compatible con el valor de AddressFamily que define el esquema de direcciones del socket.

Ejemplos

En el ejemplo siguiente se muestra cómo combinar un grupo de multidifusión proporcionando dos parámetros, una dirección de multidifusión y un número que representa el TTL.

UdpClient^ udpClient = gcnew UdpClient;
// Creates an IPAddress to use to join and drop the multicast group.
IPAddress^ multicastIpAddress = IPAddress::Parse( "239.255.255.255" );

try
{
   // The packet dies after 50 router hops.
   udpClient->JoinMulticastGroup( multicastIpAddress, 50 );
}
catch ( Exception^ e ) 
{
   Console::WriteLine( e->ToString() );
}

UdpClient udpClient = new UdpClient();
// Creates an IPAddress to use to join and drop the multicast group.
IPAddress multicastIpAddress = IPAddress.Parse("239.255.255.255");

try{
     // The packet dies after 50 router hops.
     udpClient.JoinMulticastGroup(multicastIpAddress, 50);
}
catch ( Exception e ){
    Console.WriteLine( e.ToString());
}

Dim udpClient As New UdpClient()
' Creates an IP address to use to join and drop the multicast group.
Dim multicastIpAddress As IPAddress = IPAddress.Parse("239.255.255.255")

Try
   ' The packet dies after 50 router hops.
   udpClient.JoinMulticastGroup(multicastIpAddress, 50)
Catch e As Exception
   Console.WriteLine(e.ToString())
End Try

Comentarios

El JoinMulticastGroup método suscribe a UdpClient un grupo de multidifusión mediante el especificado IPAddress. Después de llamar al JoinMulticastGroup método , el subyacente Socket envía un paquete del Protocolo de administración de grupos de Internet (IGMP) al enrutador que solicita pertenencia al grupo de multidifusión. El intervalo de direcciones de multidifusión es de 224.0.0.0 a 239.255.255.255. Si especifica una dirección fuera de este intervalo o si el enrutador al que se realiza la solicitud no está habilitada la multidifusión, UdpClient producirá un SocketException. Si recibe un SocketException, use SocketException.ErrorCode para obtener el código de error específico. Una vez que haya obtenido este código, puede consultar la documentación del código de error de la API de Windows Sockets versión 2 para obtener una descripción detallada del error. El timeToLive parámetro especifica cuántos saltos de enrutador se permitirán para un datagrama multidifusión antes de descartarse. Una vez que el UdpClient elemento aparece con el enrutador como miembro del grupo de multidifusión, podrá recibir datagramas multidifusión enviados al especificado IPAddress.

Nota

Debe crear mediante UdpClient el número de puerto de multidifusión; de lo contrario, no podrá recibir datagramas multidifusión. No llame al Connect método antes de llamar al JoinMulticastGroup método o al método receive no funcionará. No es necesario pertenecer a un grupo de multidifusión para enviar datagramas a una dirección IP de multidifusión.

Antes de unir un grupo de multidifusión, asegúrese de que el socket está enlazado al puerto o al punto de conexión. Para ello, llame a uno de los constructores que aceptan como parámetro un puerto o un punto de conexión.

Para dejar de recibir datagramas multidifusión, llame al DropMulticastGroup método y proporcione el IPAddress del grupo desde el que desea retirar.

Nota

No se puede llamar JoinMulticastGroup a en un UdpClient construido sin un puerto local específico (es decir, mediante el UdpClient() constructor o UdpClient(AddressFamily) ).

Consulte también

Se aplica a

JoinMulticastGroup(IPAddress, IPAddress)

Source:
UDPClient.cs
Source:
UDPClient.cs
Source:
UDPClient.cs

Agrega una clase UdpClient a un grupo de multidifusión.

public:
 void JoinMulticastGroup(System::Net::IPAddress ^ multicastAddr, System::Net::IPAddress ^ localAddress);
public void JoinMulticastGroup (System.Net.IPAddress multicastAddr, System.Net.IPAddress localAddress);
member this.JoinMulticastGroup : System.Net.IPAddress * System.Net.IPAddress -> unit
Public Sub JoinMulticastGroup (multicastAddr As IPAddress, localAddress As IPAddress)

Parámetros

multicastAddr
IPAddress

Clase IPAddress de multidifusión del grupo al que se piensa incorporar.

localAddress
IPAddress

IPAddress local.

Excepciones

ObjectDisposedException

El objeto Socket subyacente se ha cerrado.

SocketException

Se produjo un error al acceder al socket.

Ejemplos

En el ejemplo de código siguiente se muestra el uso del JoinMulticastGroup método .

// Subscribe to a multicast group.
static void DoJoinMulticastGroup( UdpClient^ u, String^ mcast, String^ local )
{
   array<IPAddress^>^ multicastAddress = Dns::GetHostAddresses( mcast );

   u->JoinMulticastGroup( multicastAddress[0] );
   Console::WriteLine(  "Joined multicast Address {0}", multicastAddress );
}

// Subscribe to a multicast group.
public static void DoJoinMulticastGroup(UdpClient u, string mcast)
{
    IPAddress[] multicastAddress = Dns.GetHostAddresses(mcast);

    u.JoinMulticastGroup(multicastAddress[0]);
    Console.WriteLine("Joined multicast Address {0}",
        multicastAddress[0]);
}

Comentarios

Antes de unir un grupo de multidifusión, asegúrese de que el socket está enlazado al puerto o al punto de conexión. Para ello, llame a uno de los constructores que acepte un puerto o un punto de conexión como parámetro.

Nota

Hay varios intervalos de direcciones de multidifusión entre los que elegir. Puede encontrarlos en el IETF RFC 2375.

Nota

No se puede llamar JoinMulticastGroup a en un UdpClient construido sin un puerto local específico (es decir, mediante el UdpClient() constructor o UdpClient(AddressFamily) ).

Se aplica a