TcpListener.BeginAcceptSocket(AsyncCallback, Object) TcpListener.BeginAcceptSocket(AsyncCallback, Object) TcpListener.BeginAcceptSocket(AsyncCallback, Object) TcpListener.BeginAcceptSocket(AsyncCallback, Object) Method

Définition

Démarre une opération asynchrone pour accepter une tentative de connexion entrante.Begins an asynchronous operation to accept an incoming connection attempt.

public:
 IAsyncResult ^ BeginAcceptSocket(AsyncCallback ^ callback, System::Object ^ state);
public IAsyncResult BeginAcceptSocket (AsyncCallback callback, object state);
member this.BeginAcceptSocket : AsyncCallback * obj -> IAsyncResult
Public Function BeginAcceptSocket (callback As AsyncCallback, state As Object) As IAsyncResult

Paramètres

callback
AsyncCallback AsyncCallback AsyncCallback AsyncCallback

Délégué AsyncCallback qui fait référence à la méthode à appeler quand l'opération est terminée.An AsyncCallback delegate that references the method to invoke when the operation is complete.

state
Object Object Object Object

Objet défini par l'utilisateur comportant des informations sur l'opération d'acceptation.A user-defined object containing information about the accept operation. Cet objet est passé au délégué callback quand l'opération est terminée.This object is passed to the callback delegate when the operation is complete.

Retours

IAsyncResult qui fait référence à la création asynchrone de Socket.An IAsyncResult that references the asynchronous creation of the Socket.

Exceptions

Une erreur s'est produite lors de la tentative d'accès au socket.An error occurred while attempting to access the socket.

Exemples

L’exemple de code suivant illustre l’utilisation de BeginAcceptSocket la méthode pour créer et connecter un Socket.The following code example demonstrates the use of the BeginAcceptSocket method to create and connect a socket. Le délégué de rappel appelle EndAcceptSocket la méthode pour mettre fin à la requête asynchrone.The callback delegate calls the EndAcceptSocket method to end the asynchronous request.

    // Thread signal.
public:
    static ManualResetEvent^ ClientConnected;

    // Accept one client connection asynchronously.
public:
    static void DoBeginAcceptSocket(TcpListener^ listener)
    {
        // Set the event to nonsignaled state.
        ClientConnected->Reset();

        // Start to listen for connections from a client.
        Console::WriteLine("Waiting for a connection...");

        // Accept the connection.
        // BeginAcceptSocket() creates the accepted socket.
        listener->BeginAcceptSocket(
            gcnew AsyncCallback(DoAcceptSocketCallback), listener);
        // Wait until a connection is made and processed before
        // continuing.
        ClientConnected->WaitOne();
    }

    // Process the client connection.
public:
    static void DoAcceptSocketCallback(IAsyncResult^ result)
    {
        // Get the listener that handles the client request.
        TcpListener^ listener = (TcpListener^) result->AsyncState;

        // End the operation and display the received data on the
        //console.
        Socket^ clientSocket = listener->EndAcceptSocket(result);

        // Process the connection here. (Add the client to a
        // server table, read data, etc.)
        Console::WriteLine("Client connected completed");

        // Signal the calling thread to continue.
        ClientConnected->Set();
    }
    // Thread signal.
    public static ManualResetEvent clientConnected = 
        new ManualResetEvent(false);

    // Accept one client connection asynchronously.
    public static void DoBeginAcceptSocket(TcpListener listener)
    {
        // Set the event to nonsignaled state.
        clientConnected.Reset();

        // Start to listen for connections from a client.
        Console.WriteLine("Waiting for a connection...");

        // Accept the connection. 
        // BeginAcceptSocket() creates the accepted socket.
        listener.BeginAcceptSocket(
            new AsyncCallback(DoAcceptSocketCallback), listener);
        // Wait until a connection is made and processed before 
        // continuing.
        clientConnected.WaitOne();
    }

    // Process the client connection.
    public static void DoAcceptSocketCallback(IAsyncResult ar) 
    {
        // Get the listener that handles the client request.
        TcpListener listener = (TcpListener) ar.AsyncState;
        
        // End the operation and display the received data on the
        //console.
        Socket clientSocket = listener.EndAcceptSocket(ar);

        // Process the connection here. (Add the client to a 
        // server table, read data, etc.)
        Console.WriteLine("Client connected completed");

        // Signal the calling thread to continue.
        clientConnected.Set();
    }
' Thread signal.
Public Shared clientConnected As New ManualResetEvent(False)


' Accept one client connection asynchronously.
Public Shared Sub DoBeginAcceptSocket(listener As TcpListener)
   ' Set the event to nonsignaled state.
   clientConnected.Reset()
   
   ' Start to listen for connections from a client.
   Console.WriteLine("Waiting for a connection...")
   
   ' Accept the connection. 
   ' BeginAcceptSocket() creates the accepted socket.
   listener.BeginAcceptSocket(New AsyncCallback(AddressOf DoAcceptSocketCallback), listener)
   ' Wait until a connection is made and processed before 
   ' continuing.
   clientConnected.WaitOne()
End Sub


' Process the client connection.
Public Shared Sub DoAcceptSocketCallback(ar As IAsyncResult)
   ' Get the listener that handles the client request.
   Dim listener As TcpListener = CType(ar.AsyncState, TcpListener)
   
   ' End the operation and display the received data on the
   'console.
   Dim clientSocket As Socket = listener.EndAcceptSocket(ar)
   
   ' Process the connection here. (Add the client to a 
   ' server table, read data, etc.)
   Console.WriteLine("Client connected completed")
   
   ' Signal the calling thread to continue.
   clientConnected.Set()
End Sub

Remarques

L’opération BeginAcceptSocket asynchrone doit être effectuée en appelant la EndAcceptSocket méthode.The asynchronous BeginAcceptSocket operation must be completed by calling the EndAcceptSocket method. En général, la méthode est appelée par le callback délégué.Typically, the method is invoked by the callback delegate.

Cette méthode n’est pas bloquée tant que l’opération n’est pas terminée.This method does not block until the operation completes. Pour bloquer jusqu’à la fin de l’opération, AcceptSocket utilisez la méthode.To block until the operation completes, use the AcceptSocket method.

Pour plus d’informations sur l’utilisation du modèle de programmation asynchrone, consultez appel de méthodes synchrones de façon asynchrone.For detailed information about using the asynchronous programming model, see Calling Synchronous Methods Asynchronously.

Notes

Vous pouvez appeler la RemoteEndPoint propriété du retourné Socket pour identifier l’adresse réseau et le numéro de port de l’hôte distant.You can call the RemoteEndPoint property of the returned Socket to identify the remote host's network address and port number.

Notes

Si vous recevez un SocketException, utilisez la SocketException.ErrorCode propriété pour obtenir le code d’erreur spécifique et reportez-vous à la documentation sur les codes d’erreur de l' API Windows Sockets version 2 pour obtenir une description détaillée de l’erreur.If you receive a SocketException, use the SocketException.ErrorCode property to obtain the specific error code and refer to the Windows Sockets version 2 API error code documentation for a detailed description of the error.

Notes

Ce membre génère des informations de traçage lorsque vous activez le traçage réseau dans votre application.This member outputs trace information when you enable network tracing in your application. Pour plus d’informations, consultez la page traçage réseau dans le .NET Framework.For more information, see Network Tracing in the .NET Framework.

S’applique à