TcpClient Classe

Definição

public ref class TcpClient : IDisposable

public class TcpClient : IDisposable

type TcpClient = class
    interface IDisposable

Public Class TcpClient
Implements IDisposable

Herança

Object

TcpClient

Implementações

IDisposable

Exemplos

O seguinte exemplo de código estabelece uma TcpClient ligação.

static void Connect(String server, String message)
{
  try
  {
    // Create a TcpClient.
    // Note, for this client to work you need to have a TcpServer
    // connected to the same address as specified by the server, port
    // combination.
    Int32 port = 13000;

    // Prefer a using declaration to ensure the instance is Disposed later.
    using TcpClient client = new TcpClient(server, port);

    // Translate the passed message into ASCII and store it as a Byte array.
    Byte[] data = System.Text.Encoding.ASCII.GetBytes(message);

    // Get a client stream for reading and writing.
    NetworkStream stream = client.GetStream();

    // Send the message to the connected TcpServer.
    stream.Write(data, 0, data.Length);

    Console.WriteLine("Sent: {0}", message);

    // Receive the server response.

    // Buffer to store the response bytes.
    data = new Byte[256];

    // String to store the response ASCII representation.
    String responseData = String.Empty;

    // Read the first batch of the TcpServer response bytes.
    Int32 bytes = stream.Read(data, 0, data.Length);
    responseData = System.Text.Encoding.ASCII.GetString(data, 0, bytes);
    Console.WriteLine("Received: {0}", responseData);

    // Explicit close is not necessary since TcpClient.Dispose() will be
    // called automatically.
    // stream.Close();
    // client.Close();
  }
  catch (ArgumentNullException e)
  {
    Console.WriteLine("ArgumentNullException: {0}", e);
  }
  catch (SocketException e)
  {
    Console.WriteLine("SocketException: {0}", e);
  }

  Console.WriteLine("\n Press Enter to continue...");
  Console.Read();
}

Shared Sub Connect(server As [String], message As [String])
   Try
      ' Create a TcpClient.
      ' Note, for this client to work you need to have a TcpServer 
      ' connected to the same address as specified by the server, port
      ' combination.
      Dim port As Int32 = 13000

      ' Prefer using declaration to ensure the instance is Disposed later.
      Using client As New TcpClient(server, port)
      
         ' Translate the passed message into ASCII and store it as a Byte array.
         Dim data As [Byte]() = System.Text.Encoding.ASCII.GetBytes(message)
         
         ' Get a client stream for reading and writing.
         Dim stream As NetworkStream = client.GetStream()
         
         ' Send the message to the connected TcpServer. 
         stream.Write(data, 0, data.Length)
         
         Console.WriteLine("Sent: {0}", message)
         
         ' Receive the server response.
         ' Buffer to store the response bytes.
         data = New [Byte](256) {}
         
         ' String to store the response ASCII representation.
         Dim responseData As [String] = [String].Empty
         
         ' Read the first batch of the TcpServer response bytes.
         Dim bytes As Int32 = stream.Read(data, 0, data.Length)
         responseData = System.Text.Encoding.ASCII.GetString(data, 0, bytes)
         Console.WriteLine("Received: {0}", responseData)
         
         ' Explicit close is not necessary since TcpClient.Dispose() will be
         ' called automatically.
         ' stream.Close()
         ' client.Close()
      End Using
   Catch e As ArgumentNullException
      Console.WriteLine("ArgumentNullException: {0}", e)
   Catch e As SocketException
      Console.WriteLine("SocketException: {0}", e)
   End Try
   
   Console.WriteLine(ControlChars.Cr + " Press Enter to continue...")
   Console.Read()
End Sub

Observações

A TcpClient classe fornece métodos simples para ligar, enviar e receber dados de fluxo através de uma rede em modo de bloqueio síncrono.

Para TcpClient poder ligar e trocar dados, um TcpListener ou Socket criado com o TCP ProtocolType deve estar a ouvir pedidos de ligação recebidos. Pode ligar-se a este ouvinte de uma das seguintes duas formas:

• Crie um TcpClient e chame um dos três métodos disponíveis Connect .

• Crie um TcpClient usando o nome do host e o número de porta do host remoto. Este construtor tentará automaticamente uma ligação.

Notas para Herdeiros

Para enviar e receber dados, use o GetStream() método para obter um NetworkStream. Chame os Write(Byte[], Int32, Int32) métodos e Read(Byte[], Int32, Int32) do NetworkStream para enviar e receber dados com o host remoto. Use o Close(Int32) método para libertar todos os recursos associados ao TcpClient.

Ver também

• TcpListener
• NetworkStream
• Socket
• ProtocolType
• IPEndPoint
• Connect(String, Int32)
• Write(Byte[], Int32, Int32)
• Read(Byte[], Int32, Int32)
• TCP-UDP