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How to ping a URL from C#

P: n/a
All,
I have an offline application that works online for some data
syncronization. For data syncronization I access a webservice. I want
to show whether my application is online or not by checking whether
the application is able to access the webservice.

If the webservice is accessible, the application is online. otherwise
it is offline

What is the best way to ping a url in C# ?

Thanks much
Kris

Feb 15 '07 #1
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1 Reply


P: n/a
Krish,

There are a few ways to do this. First, you could create a method within
your web service that returns void and call this method first. If this
method is accessible, your web service is online.

Also, if you want to actually ping the domain on which the web service is
hosted, you could use the following code:

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.");
}

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);
}
}
}
}

Let me know if you have any additional questions.

Shaun McDonnell

"Krish" <ba****@gmail.comwrote in message
news:11**********************@v45g2000cwv.googlegr oups.com...
All,
I have an offline application that works online for some data
syncronization. For data syncronization I access a webservice. I want
to show whether my application is online or not by checking whether
the application is able to access the webservice.

If the webservice is accessible, the application is online. otherwise
it is offline

What is the best way to ping a url in C# ?

Thanks much
Kris
Feb 15 '07 #2

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