PingCompletedEventHandler デリゲート
アセンブリ: System (system.dll 内)

Public Delegate Sub PingCompletedEventHandler ( _ sender As Object, _ e As PingCompletedEventArgs _ )
/** @delegate */ public delegate void PingCompletedEventHandler ( Object sender, PingCompletedEventArgs e )


PingCompletedEventHandler を指定して PingCompleted イベントに応答するコード例を次に示します。
using System; using System.Text; using System.Net; using System.Net.NetworkInformation; using System.ComponentModel; using System.Threading; namespace Examples.System.Net.NetworkInformation.PingTest { public class PingExample { public static void Main (string[] args) { if (args.Length == 0) throw new ArgumentException ("Ping needs a host or IP Address."); string who = args[0]; AutoResetEvent waiter = new AutoResetEvent (false); Ping pingSender = new Ping (); // When the PingCompleted event is raised, // the PingCompletedCallback method is called. pingSender.PingCompleted += new PingCompletedEventHandler (PingCompletedCallback); // Create a buffer of 32 bytes of data to be transmitted. string data = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"; byte[] buffer = Encoding.ASCII.GetBytes (data); // Wait 12 seconds for a reply. int timeout = 12000; // Set options for transmission: // The data can go through 64 gateways or routers // before it is destroyed, and the data packet // cannot be fragmented. PingOptions options = new PingOptions (64, true); Console.WriteLine ("Time to live: {0}", options.Ttl); Console.WriteLine ("Don't fragment: {0}", options.DontFragment); // Send the ping asynchronously. // Use the waiter as the user token. // When the callback completes, it can wake up this thread. pingSender.SendAsync(who, timeout, buffer, options, waiter); // Prevent this example application from ending. // A real application should do something useful // when possible. waiter.WaitOne (); Console.WriteLine ("Ping example completed."); } public static void PingCompletedCallback (object sender, PingCompletedEventArgs e) { // If the operation was canceled, display a message to the user. if (e.Cancelled) { Console.WriteLine ("Ping canceled."); // Let the main thread resume. // UserToken is the AutoResetEvent object that the main thread // is waiting for. ((AutoResetEvent)e.UserState).Set (); } // If an error occurred, display the exception to the user. if (e.Error != null) { Console.WriteLine ("Ping failed:"); Console.WriteLine (e.Error.ToString ()); // Let the main thread resume. ((AutoResetEvent)e.UserState).Set(); } PingReply reply = e.Reply; DisplayReply (reply); // Let the main thread resume. ((AutoResetEvent)e.UserState).Set(); } public static void DisplayReply (PingReply reply) { if (reply == null) return; Console.WriteLine ("ping status: {0}", reply.Status); if (reply.Status == IPStatus.Success) { Console.WriteLine ("Address: {0}", reply.Address.ToString ()); Console.WriteLine ("RoundTrip time: {0}", reply.RoundtripTime); Console.WriteLine ("Time to live: {0}", reply.Options.Ttl); Console.WriteLine ("Don't fragment: {0}", reply.Options.DontFragment); Console.WriteLine ("Buffer size: {0}", reply.Buffer.Length); } } } }

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
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