UdpClient.Receive(IPEndPoint) Método

public:
 cli::array <System::Byte> ^ Receive(System::Net::IPEndPoint ^ % remoteEP);

public byte[] Receive (ref System.Net.IPEndPoint? remoteEP);

public byte[] Receive (ref System.Net.IPEndPoint remoteEP);

member this.Receive : IPEndPoint -> byte[]

Public Function Receive (ByRef remoteEP As IPEndPoint) As Byte()

Parâmetros

Retornos

Uma matriz do tipo Byte que contém dados de datagrama.

Exceções

Exemplos

O exemplo a seguir demonstra o Receive método. O Receive método bloqueia a execução até receber uma mensagem. Usando o IPEndPoint passado para Receive, a identidade do host que responde é revelada.

//Creates a UdpClient for reading incoming data.
UdpClient^ receivingUdpClient = gcnew UdpClient( 11000 );

//Creates an IPEndPoint to record the IP Address and port number of the sender. 
// The IPEndPoint will allow you to read datagrams sent from any source.
IPEndPoint^ RemoteIpEndPoint = gcnew IPEndPoint( IPAddress::Any,0 );
try
{
   // Blocks until a message returns on this socket from a remote host.
   array<Byte>^receiveBytes = receivingUdpClient->Receive(  RemoteIpEndPoint );

   String^ returnData = Encoding::ASCII->GetString( receiveBytes );

   Console::WriteLine( "This is the message you received {0}", returnData );
   Console::WriteLine( "This message was sent from {0} on their port number {1}",
      RemoteIpEndPoint->Address, RemoteIpEndPoint->Port );
}
catch ( Exception^ e ) 
{
   Console::WriteLine( e->ToString() );
}

 //Creates a UdpClient for reading incoming data.
 UdpClient receivingUdpClient = new UdpClient(11000);

 //Creates an IPEndPoint to record the IP Address and port number of the sender.
// The IPEndPoint will allow you to read datagrams sent from any source.
 IPEndPoint RemoteIpEndPoint = new IPEndPoint(IPAddress.Any, 0);
 try{

     // Blocks until a message returns on this socket from a remote host.
     Byte[] receiveBytes = receivingUdpClient.Receive(ref RemoteIpEndPoint);

     string returnData = Encoding.ASCII.GetString(receiveBytes);

     Console.WriteLine("This is the message you received " +
                               returnData.ToString());
     Console.WriteLine("This message was sent from " +
                                 RemoteIpEndPoint.Address.ToString() +
                                 " on their port number " +
                                 RemoteIpEndPoint.Port.ToString());
 }
 catch ( Exception e ){
     Console.WriteLine(e.ToString());
 }

   'Creates a UdpClient for reading incoming data.
   Dim receivingUdpClient As New UdpClient(11000)
   
   'Creates an IPEndPoint to record the IP address and port number of the sender. 
   ' The IPEndPoint will allow you to read datagrams sent from any source.
   Dim RemoteIpEndPoint As New IPEndPoint(IPAddress.Any, 0)
   Try
      
      ' Blocks until a message returns on this socket from a remote host.
      Dim receiveBytes As [Byte]() = receivingUdpClient.Receive(RemoteIpEndPoint)
      
      Dim returnData As String = Encoding.ASCII.GetString(receiveBytes)
      
      Console.WriteLine(("This is the message you received " + returnData.ToString()))
      Console.WriteLine(("This message was sent from " + RemoteIpEndPoint.Address.ToString() + " on their port number " + RemoteIpEndPoint.Port.ToString()))
   Catch e As Exception
      Console.WriteLine(e.ToString())
   End Try
End Sub

Comentários

O Receive método será bloqueado até que um datagrama chegue de um host remoto. Quando os dados estiverem disponíveis, o Receive método lerá o primeiro datagrama enfileirado e retornará a parte de dados como uma matriz de bytes. Esse método preenche o remoteEP parâmetro com o IPAddress número da porta e do remetente.

Se você especificar um host remoto padrão no Connect método , o Receive método aceitará apenas datagramas desse host. Todos os outros datagramas serão descartados.

Se você receber um SocketException, use SocketException.ErrorCode para obter o código de erro específico. Depois de obter esse código, você pode consultar a documentação do código de erro da API do Windows Sockets versão 2 para obter uma descrição detalhada do erro.

Aplica-se a

Confira também

• Send(Byte[], Int32, IPEndPoint)
• IPEndPoint
• Connect(String, Int32)
• IPAddress