C# ping操作，MSDN版（不是socket自己写值的版本）
class PingClass {
private static long ms = -1;
public static long ping(string ip) {
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 = 2000;
// 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(ip, 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.");
return ms;
}
private 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);
ms = reply.RoundtripTime;
} else {
ms = -1;
}
}
}
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