SslStream.BeginRead(Byte[], Int32, Int32, AsyncCallback, Object) Yöntem

public:
 override IAsyncResult ^ BeginRead(cli::array <System::Byte> ^ buffer, int offset, int count, AsyncCallback ^ asyncCallback, System::Object ^ asyncState);

public override IAsyncResult BeginRead (byte[] buffer, int offset, int count, AsyncCallback? asyncCallback, object? asyncState);

public override IAsyncResult BeginRead (byte[] buffer, int offset, int count, AsyncCallback asyncCallback, object asyncState);

override this.BeginRead : byte[] * int * int * AsyncCallback * obj -> IAsyncResult

Public Overrides Function BeginRead (buffer As Byte(), offset As Integer, count As Integer, asyncCallback As AsyncCallback, asyncState As Object) As IAsyncResult

Parametreler

Döndürülenler

IAsyncResult Zaman uyumsuz işlemin durumunu gösteren nesne.

Özel durumlar

Örnekler

Aşağıdaki kod örneği zaman uyumsuz okuma işlemini başlatma işlemini gösterir.

// readData and buffer holds the data read from the server.
// They is used by the ReadCallback method.
static StringBuilder^ readData = gcnew StringBuilder;
static array<Byte>^buffer = gcnew array<Byte>(2048);

// readData and buffer holds the data read from the server.
// They is used by the ReadCallback method.
static StringBuilder readData = new StringBuilder();
static byte [] buffer = new byte[2048];

' readData and buffer holds the data read from the server.
' They is used by the ReadCallback method.
Shared readData As New StringBuilder()
Shared buffer As Byte() = New Byte(2048) {}

static void WriteCallback( IAsyncResult^ ar )
{
   SslStream^ stream = dynamic_cast<SslStream^>(ar->AsyncState);
   try
   {
      Console::WriteLine( L"Writing data to the server." );
      stream->EndWrite( ar );
      
      // Asynchronously read a message from the server.
      stream->BeginRead( buffer, 0, buffer->Length, gcnew AsyncCallback( ReadCallback ), stream );
   }
   catch ( Exception^ writeException ) 
   {
      e = writeException;
      complete = true;
      return;
   }

}

static void WriteCallback(IAsyncResult ar)
{
    SslStream stream = (SslStream) ar.AsyncState;
    try
    {
        Console.WriteLine("Writing data to the server.");
        stream.EndWrite(ar);
        // Asynchronously read a message from the server.
        stream.BeginRead(buffer, 0, buffer.Length,
            new AsyncCallback(ReadCallback),
            stream);
    }
    catch (Exception writeException)
    {
        e = writeException;
        complete = true;
        return;
    }
}

Shared Sub WriteCallback(ar As IAsyncResult)
    Dim stream = CType(ar.AsyncState, SslStream)
    Try
        Console.WriteLine("Writing data to the server.")
        stream.EndWrite(ar)
        ' Asynchronously read a message from the server.
        stream.BeginRead(buffer, 0, buffer.Length, New AsyncCallback(AddressOf ReadCallback), stream)
    Catch writeException As Exception
        e = writeException
        complete = True
        Return
    End Try
End Sub

Okuma tamamlandığında aşağıdaki yöntem çağrılır.

static void ReadCallback( IAsyncResult^ ar )
{
   
   // Read the  message sent by the server.
   // The end of the message is signaled using the
   // "<EOF>" marker.
   SslStream^ stream = dynamic_cast<SslStream^>(ar->AsyncState);
   int byteCount = -1;
   try
   {
      Console::WriteLine( L"Reading data from the server." );
      byteCount = stream->EndRead( ar );
      
      // Use Decoder class to convert from bytes to UTF8
      // in case a character spans two buffers.
      Decoder^ decoder = Encoding::UTF8->GetDecoder();
      array<Char>^chars = gcnew array<Char>(decoder->GetCharCount( buffer, 0, byteCount ));
      decoder->GetChars( buffer, 0, byteCount, chars, 0 );
      readData->Append( chars );
      
      // Check for EOF or an empty message.
      if ( readData->ToString()->IndexOf( L"<EOF>" ) == -1 && byteCount != 0 )
      {
         
         // We are not finished reading.
         // Asynchronously read more message data from  the server.
         stream->BeginRead( buffer, 0, buffer->Length, gcnew AsyncCallback( ReadCallback ), stream );
      }
      else
      {
         Console::WriteLine( L"Message from the server: {0}", readData );
      }
   }
   catch ( Exception^ readException ) 
   {
      e = readException;
      complete = true;
      return;
   }

   complete = true;
}

static void ReadCallback(IAsyncResult ar)
{
    // Read the  message sent by the server.
    // The end of the message is signaled using the
    // "<EOF>" marker.
    SslStream stream = (SslStream) ar.AsyncState;
    int byteCount = -1;
    try
    {
        Console.WriteLine("Reading data from the server.");
        byteCount = stream.EndRead(ar);
        // Use Decoder class to convert from bytes to UTF8
        // in case a character spans two buffers.
        Decoder decoder = Encoding.UTF8.GetDecoder();
        char[] chars = new char[decoder.GetCharCount(buffer,0, byteCount)];
        decoder.GetChars(buffer, 0, byteCount, chars,0);
        readData.Append (chars);
        // Check for EOF or an empty message.
        if (readData.ToString().IndexOf("<EOF>") == -1 && byteCount != 0)
        {
            // We are not finished reading.
            // Asynchronously read more message data from  the server.
            stream.BeginRead(buffer, 0, buffer.Length,
                new AsyncCallback(ReadCallback),
                stream);
        }
        else
        {
            Console.WriteLine("Message from the server: {0}", readData.ToString());
        }
    }
    catch (Exception readException)
    {
        e = readException;
        complete = true;
        return;
    }
    complete = true;
}

Shared Sub ReadCallback(ar As IAsyncResult)
    ' Read the  message sent by the server.
    ' The end of the message is signaled using the
    ' "<EOF>" marker.
    Dim stream = CType(ar.AsyncState, SslStream)
    Dim byteCount As Integer
    Try
        Console.WriteLine("Reading data from the server.")
        byteCount = stream.EndRead(ar)
        ' Use Decoder class to convert from bytes to UTF8
        ' in case a character spans two buffers.
        Dim decoder As Decoder = Encoding.UTF8.GetDecoder()
        Dim chars = New Char(decoder.GetCharCount(buffer, 0, byteCount)) {}
        decoder.GetChars(buffer, 0, byteCount, chars, 0)
        readData.Append(chars)
        ' Check for EOF or an empty message.
        If readData.ToString().IndexOf("<EOF>") = -1 AndAlso byteCount <> 0 Then
            ' We are not finished reading.
            ' Asynchronously read more message data from  the server.
            stream.BeginRead(buffer, 0, buffer.Length, New AsyncCallback(AddressOf ReadCallback), stream)
        Else
            Console.WriteLine("Message from the server: {0}", readData.ToString())
        End If
    Catch readException As Exception
        e = readException
        complete = True
        Return
    End Try
    complete = True
End Sub

Açıklamalar

Şifreleme ve veya imzalama etkinleştirildiyse, okuma işlemi temel alınan akıştaki verileri okur, verilerin bütünlüğünü denetler ve/veya şifresini çözer. Zaman uyumsuz okuma işlemi yöntemi çağrılarak EndRead tamamlanmalıdır. Genellikle, yöntemi temsilci tarafından çağrılır asyncCallback .

İşlem tamamlarken bu yöntem engellemez. İşlem tamamlanana kadar engellemek için yöntemini kullanın Read .

Zaman uyumsuz programlama modelini kullanma hakkında ayrıntılı bilgi için bkz. Zaman Uyumlu Yöntemleri Zaman Uyumsuz Olarak Çağırma

sınıfı SslStream birden çok eşzamanlı okuma işlemini desteklemez.

Kimlik doğrulaması başarılı olana kadar bu yöntemi çağıramazsınız. Kimlik doğrulaması yapmak için , veya BeginAuthenticateAsClient, AuthenticateAsServer, BeginAuthenticateAsServer yöntemlerinden birini AuthenticateAsClientçağırın.

Şunlara uygulanır