TcpClient.GetStream Méthode

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

Retours

L'élément NetworkStream sous-jacent.

Exceptions

Exemples

L’exemple de code suivant utilise GetStream pour obtenir le sous-jacent NetworkStream. Après avoir obtenu , il envoie et reçoit à l’aide NetworkStreamde ses Write méthodes et 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

Remarques

La GetStream méthode retourne un NetworkStream que vous pouvez utiliser pour envoyer et recevoir des données. La NetworkStream classe hérite de la Stream classe , qui fournit une collection riche de méthodes et de propriétés utilisées pour faciliter les communications réseau.

Vous devez d’abord appeler la Connect méthode, sinon la GetStream méthode lève un InvalidOperationException. Une fois que vous avez obtenu , NetworkStreamappelez la Write méthode pour envoyer des données à l’hôte distant. Appelez la Read méthode pour recevoir des données provenant de l’hôte distant. Ces deux méthodes se bloquent jusqu’à ce que l’opération spécifiée soit effectuée. Vous pouvez éviter de bloquer une opération de lecture en vérifiant la DataAvailable propriété . Une true valeur signifie que les données sont arrivées de l’hôte distant et qu’elles peuvent être lues. Dans ce cas, Read est garanti de se terminer immédiatement. Si l’hôte distant a arrêté sa connexion, Read retourne immédiatement avec zéro octet.

S’applique à

Voir aussi

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