C# 中用Socket实现判断网络是否断开的实例
1 using System;
2 using System.Net;
3 using System.Net.Sockets;
4 using System.Text;
5
6 public class SynchronousSocketClient {
7
8 public static void StartClient() {
9 // Data buffer for incoming data.
10 byte[] bytes = new byte[1024];
11
12 // Connect to a remote device.
13 try {
14 // Establish the remote endpoint for the socket.
15 // This example uses port 11000 on the local computer.
16 IPHostEntry ipHostInfo = Dns.Resolve(Dns.GetHostName())
17 IPAddress ipAddress = ipHostInfo.AddressList[0];
18 IPEndPoint remoteEP = new IPEndPoint(ipAddress,11000);
19
20 // Create a TCP/IP socket.
21 Socket sender = new Socket(AddressFamily.InterNetwork,
22 SocketType.Stream, ProtocolType.Tcp );
23
24 // Connect the socket to the remote endpoint. Catch any errors.
25 try {
26 sender.Connect(remoteEP);
27
28 Console.WriteLine("Socket connected to {0}",
29 sender.RemoteEndPoint.ToString());
30
31 // Encode the data string into a byte array.
32 byte[] msg = Encoding.ASCII.GetBytes("This is a test<EOF>");
33
34 // Send the data through the socket.
35 int bytesSent = sender.Send(msg);
36
37 // Receive the response from the remote device.
38 int bytesRec = sender.Receive(bytes);
39 Console.WriteLine("Echoed test = {0}",
40 Encoding.ASCII.GetString(bytes,0,bytesRec));
41
42 // Release the socket.
43 sender.Shutdown(SocketShutdown.Both);
44 sender.Close();
45
46 } catch (ArgumentNullException ane) {
47 Console.WriteLine("ArgumentNullException : {0}",ane.ToString());
48 } catch (SocketException se) {
49 Console.WriteLine("SocketException : {0}",se.ToString());
50 } catch (Exception e) {
51 Console.WriteLine("Unexpected exception : {0}", e.ToString());
52 }
53
54 } catch (Exception e) {
55 Console.WriteLine( e.ToString());
56 }
57 }
58
59 public static int Main(String[] args) {
60 StartClient();
61 return 0;
62 }
63 }
//服务器端：
1 using System;
2 using System.Net;
3 using System.Net.Sockets;
4 using System.Text;
5
6 public class SynchronousSocketListener {
7
8 // Incoming data from the client.
9 public static string data = null;
10
11 public static void StartListening() {
12 // Data buffer for incoming data.
13 byte[] bytes = new Byte[1024];
14
15 // Establish the local endpoint for the socket.
16 // Dns.GetHostName returns the name of the
17 // host running the application.
18 IPHostEntry ipHostInfo = Dns.Resolve(Dns.GetHostName());
19 IPAddress ipAddress = ipHostInfo.AddressList[0];
20 IPEndPoint localEndPoint = new IPEndPoint(ipAddress, 11000);
21
22 // Create a TCP/IP socket.
23 Socket listener = new Socket(AddressFamily.InterNetwork,
24 SocketType.Stream, ProtocolType.Tcp );
25
26 // Bind the socket to the local endpoint and
27 // listen for incoming connections.
28 try {
29 listener.Bind(localEndPoint);
30 listener.Listen(10);
31
32 // Start listening for connections.
33 while (true) {
34 Console.WriteLine("Waiting for a connection
");
35 // Program is suspended while waiting for an incoming connection.
36 Socket handler = listener.Accept();
37 data = null;
38
39 // An incoming connection needs to be processed.
40 while (true) {
41 bytes = new byte[1024];
42 int bytesRec = handler.Receive(bytes);
43 data += Encoding.ASCII.GetString(bytes,0,bytesRec);
44 if (data.IndexOf("<EOF>") > -1) {
45 break;
46 }
47 }
48
49 // Show the data on the console.
50 Console.WriteLine( "Text received : {0}", data);
51
52 // Echo the data back to the client.
53 byte[] msg = Encoding.ASCII.GetBytes(data);
54
55 handler.Send(msg);
56 handler.Shutdown(SocketShutdown.Both);
57 handler.Close();
58 }
59
60 } catch (Exception e) {
61 Console.WriteLine(e.ToString());
62 }
63
64 Console.WriteLine("\nPress ENTER to continue");
65 Console.Read();
66
67 }
68
69 public static int Main(String[] args) {
70 StartListening();
71 return 0;
72 }
73 }
// 服务器端（固定的实例）
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Diagnostics;
using System.ServiceProcess;
using System.Text;
using System.Net;
using System.Net.Sockets;
namespace SynchronousSocketListener
{
partial class SocketListener : ServiceBase
{
public static string strData = null;
System.Timers.Timer tmTrick = new System.Timers.Timer();
public delegate void OperationDelegate();
public SocketListener()
{
InitializeComponent();
}
protected override void OnStart(string[] args)
{
tmTrick.Enabled = true;
tmTrick.Interval = 3;
tmTrick.Elapsed += new System.Timers.ElapsedEventHandler(StartListening);
tmTrick.Start();
DataEventLog.WriteEntry("调运系统网络状态监控服务成功启动!");
}
protected override void OnStop()
{
DataEventLog.WriteEntry("调运系统网络状态监控服务成功停止!");
}
protected void StartListening(object sender, EventArgs e)
{
tmTrick.Stop();
byte[] bytes = new Byte[1024];
IPHostEntry ipHostInfo = Dns.Resolve(Dns.GetHostName());
IPAddress ipAddress = ipHostInfo.AddressList[0];
IPEndPoint localEndPoint = new IPEndPoint(ipAddress, 10000);
Socket listener = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
try
{
listener.Bind(localEndPoint);
listener.Listen(30);
while (true)
{
Socket sktHandler = listener.Accept();
strData = null;
while (true)
{
bytes = new byte[1024];
int bytesRec = sktHandler.Receive(bytes);
strData += Encoding.ASCII.GetString(bytes, 0, bytesRec);
if (strData.IndexOf("<EOF>") > -1)
{
break;
}
}
byte[] btMessage = Encoding.ASCII.GetBytes(strData);
sktHandler.Send(btMessage);
sktHandler.Shutdown(SocketShutdown.Both);
sktHandler.Close();
}
}
catch (Exception ex)
{
DataEventLog.WriteEntry(ex.ToString());
}
}
}
}
