Esempio di socket client sincrono
Mediante il seguente programma di esempio viene creato un client per la connessione a un server. Poiché il client viene generato con un socket sincrono, l'esecuzione dell'applicazione client viene sospesa fino a quando viene restituita una risposta dal server. Viene inviata una stringa al server e la stringa restituita dal server viene visualizzata nella console.
Imports System
Imports System.Net
Imports System.Net.Sockets
Imports System.Text
Public Class SynchronousSocketClient
Public Shared Sub StartClient()
' Data buffer for incoming data.
Dim bytes(1024) As Byte
' Connect to a remote device.
Try
' Establish the remote endpoint for the socket.
' The name of the
' remote device is "host.contoso.com".
Dim ipHostInfo As IPHostEntry = Dns.Resolve("host.contoso.com")
Dim ipAddress As IPAddress = ipHostInfo.AddressList(0)
Dim remoteEP As New IPEndPoint(ipAddress, 11000)
' Create a TCP/IP socket.
Dim sender As New Socket(AddressFamily.InterNetwork, _
SocketType.Stream, ProtocolType.Tcp)
' Connect the socket to the remote endpoint. Catch any errors.
Try
sender.Connect(remoteEP)
Console.WriteLine("Socket connected to {0}", _
sender.RemoteEndPoint.ToString())
' Encode the data string into a byte array.
Dim msg As Byte() = _
Encoding.ASCII.GetBytes("This is a test<EOF>")
' Send the data through the socket.
Dim bytesSent As Integer = sender.Send(msg)
' Receive the response from the remote device.
Dim bytesRec As Integer = sender.Receive(bytes)
Console.WriteLine("Echoed test = {0}", _
Encoding.ASCII.GetString(bytes, 0, bytesRec))
' Release the socket.
sender.Shutdown(SocketShutdown.Both)
sender.Close()
Catch ane As ArgumentNullException
Console.WriteLine("ArgumentNullException : {0}", _
ane.ToString())
Catch se As SocketException
Console.WriteLine("SocketException : {0}", se.ToString())
Catch e As Exception
Console.WriteLine("Unexpected exception : {0}", e.ToString())
End Try
Catch e As Exception
Console.WriteLine(e.ToString())
End Try
End Sub 'StartClient
' Entry point that delegates to C-style main Private Function.
Public Overloads Shared Sub Main()
System.Environment.ExitCode = _
Main(System.Environment.GetCommandLineArgs())
End Sub
Overloads Public Shared Function Main(args() As [String]) As Integer
StartClient()
Return 0
End Function 'Main
End Class 'SynchronousSocketClient
[C#]
using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
public class SynchronousSocketClient {
public static void StartClient() {
// Data buffer for incoming data.
byte[] bytes = new byte[1024];
// Connect to a remote device.
try {
// Establish the remote endpoint for the socket.
// The name of the
// remote device is "host.contoso.com".
IPHostEntry ipHostInfo = Dns.Resolve("host.contoso.com");
IPAddress ipAddress = ipHostInfo.AddressList[0];
IPEndPoint remoteEP = new IPEndPoint(ipAddress,11000);
// Create a TCP/IP socket.
Socket sender = new Socket(AddressFamily.InterNetwork,
SocketType.Stream, ProtocolType.Tcp );
// Connect the socket to the remote endpoint. Catch any errors.
try {
sender.Connect(remoteEP);
Console.WriteLine("Socket connected to {0}",
sender.RemoteEndPoint.ToString());
// Encode the data string into a byte array.
byte[] msg = Encoding.ASCII.GetBytes("This is a test<EOF>");
// Send the data through the socket.
int bytesSent = sender.Send(msg);
// Receive the response from the remote device.
int bytesRec = sender.Receive(bytes);
Console.WriteLine("Echoed test = {0}",
Encoding.ASCII.GetString(bytes,0,bytesRec));
// Release the socket.
sender.Shutdown(SocketShutdown.Both);
sender.Close();
} catch (ArgumentNullException ane) {
Console.WriteLine("ArgumentNullException : {0}",ane.ToString());
} catch (SocketException se) {
Console.WriteLine("SocketException : {0}",se.ToString());
} catch (Exception e) {
Console.WriteLine("Unexpected exception : {0}", e.ToString());
}
} catch (Exception e) {
Console.WriteLine( e.ToString());
}
}
public static int Main(String[] args) {
StartClient();
return 0;
}
}
Vedere anche
Esempio di socket server sincrono | Utilizzo di un socket client sincrono | Esempi di codice di socket