TcpClient.GetStream Método

public:
 System::Net::Sockets::NetworkStream ^ GetStream();

public System.Net.Sockets.NetworkStream GetStream ();

member this.GetStream : unit -> System.Net.Sockets.NetworkStream

Public Function GetStream () As NetworkStream

Retornos

O NetworkStream subjacente.

Exceções

Exemplos

O exemplo de código a seguir usa GetStream para obter o subjacente NetworkStream. Depois de obter o NetworkStream, ele envia e recebe usando seus Write métodos e Read .

TcpClient^ tcpClient = gcnew TcpClient;

// Uses the GetStream public method to return the NetworkStream.
NetworkStream^ netStream = tcpClient->GetStream();
if ( netStream->CanWrite )
{
   array<Byte>^sendBytes = Encoding::UTF8->GetBytes( "Is anybody there?" );
   netStream->Write( sendBytes, 0, sendBytes->Length );
}
else
{
   Console::WriteLine( "You cannot write data to this stream." );
   tcpClient->Close();
   
   // Closing the tcpClient instance does not close the network stream.
   netStream->Close();
   return;
}

if ( netStream->CanRead )
{
   
   // Reads NetworkStream into a byte buffer.
   array<Byte>^bytes = gcnew array<Byte>(tcpClient->ReceiveBufferSize);
   
   // Read can return anything from 0 to numBytesToRead. 
   // This method blocks until at least one byte is read.
   netStream->Read( bytes, 0, (int)tcpClient->ReceiveBufferSize );
   
   // Returns the data received from the host to the console.
   String^ returndata = Encoding::UTF8->GetString( bytes );
   Console::WriteLine( "This is what the host returned to you: {0}", returndata );
}
else
{
   Console::WriteLine( "You cannot read data from this stream." );
   tcpClient->Close();
   
   // Closing the tcpClient instance does not close the network stream.
   netStream->Close();
   return;
}

using TcpClient tcpClient = new TcpClient();
tcpClient.ConnectAsync("contoso.com", 5000);

using NetworkStream netStream = tcpClient.GetStream();

// Send some data to the peer.
byte[] sendBuffer = Encoding.UTF8.GetBytes("Is anybody there?");
netStream.Write(sendBuffer);

// Receive some data from the peer.
byte[] receiveBuffer = new byte[1024];
int bytesReceived = netStream.Read(receiveBuffer);
string data = Encoding.UTF8.GetString(receiveBuffer.AsSpan(0, bytesReceived));

Console.WriteLine($"This is what the peer sent to you: {data}");

     Dim tcpClient As New TcpClient()
     ' Uses the GetStream public method to return the NetworkStream.

        Dim netStream As NetworkStream = tcpClient.GetStream()
        If netStream.CanWrite Then
           Dim sendBytes As [Byte]() = Encoding.UTF8.GetBytes("Is anybody there?")
           netStream.Write(sendBytes, 0, sendBytes.Length)
        Else
           Console.WriteLine("You cannot write data to this stream.")
           tcpClient.Close()
           ' Closing the tcpClient instance does not close the network stream.
           netStream.Close()
           Return
        End If
        If netStream.CanRead Then
           
           ' Reads the NetworkStream into a byte buffer.
           Dim bytes(tcpClient.ReceiveBufferSize) As Byte
           ' Read can return anything from 0 to numBytesToRead. 
           ' This method blocks until at least one byte is read.
           netStream.Read(bytes, 0, CInt(tcpClient.ReceiveBufferSize))
           
           ' Returns the data received from the host to the console.
           Dim returndata As String = Encoding.ASCII.GetString(bytes)
           Console.WriteLine(("This is what the host returned to you: " + returndata))
        Else
           Console.WriteLine("You cannot read data from this stream.")
           tcpClient.Close()
           ' Closing the tcpClient instance does not close the network stream.
           netStream.Close()
           Return
        End If

     ' Uses the Close public method to close the network stream and socket.
     tcpClient.Close()
  End Sub

Comentários

O GetStream método retorna um NetworkStream que você pode usar para enviar e receber dados. A NetworkStream classe herda da Stream classe , que fornece uma coleção avançada de métodos e propriedades usadas para facilitar as comunicações de rede.

Você deve chamar o Connect método primeiro ou o GetStream método gerará um InvalidOperationException. Depois de obter o NetworkStream, chame o Write método para enviar dados para o host remoto. Chame o Read método para receber dados que chegam do host remoto. Esses dois métodos são bloqueados até que a operação especificada seja executada. Você pode evitar o bloqueio em uma operação de leitura verificando a DataAvailable propriedade . Um true valor significa que os dados chegaram do host remoto e estão disponíveis para leitura. Nesse caso, Read é garantido que seja concluído imediatamente. Se o host remoto tiver desligado sua conexão, Read retornará imediatamente com zero bytes.

Aplica-se a

Confira também

• NetworkStream
• Write(Byte[], Int32, Int32)
• Read(Byte[], Int32, Int32)
• DataAvailable
• Stream
• Connect(String, Int32)