同期クライアント ソケットの例

サーバーに接続するクライアントを作成するプログラム例を次に示します。このクライアントは同期ソケットを使用して構築されるため、クライアント アプリケーションの実行はサーバーが応答を返すまで中断されます。アプリケーションは、サーバーに文字列を送信し、サーバーから返された文字列をコンソールに表示します。

Imports System
Imports System.Net
Imports System.Net.Sockets
Imports System.Text

Public Class SynchronousSocketClient

    Public Shared Sub Main()
        ' Data buffer for incoming data.
        Dim bytes(1024) As Byte

        ' Connect to a remote device.

        ' Establish the remote endpoint for the socket.
        ' This example uses port 11000 on the local computer.
        Dim ipHostInfo As IPHostEntry = Dns.Resolve(Dns.GetHostName())
        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.
        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()
    End Sub

End Class 'SynchronousSocketClient

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.
            // This example uses port 11000 on the local computer.
            IPHostEntry ipHostInfo = Dns.Resolve(Dns.GetHostName())
            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;
    }
}

参照

概念

同期サーバー ソケットの例
同期クライアント ソケットの使用

その他の技術情報

ソケットのコード例