/// <summary>
/// Loops through the IP address and does the pings.
/// </summary>
/// <param name="o">Start and end IP addresses to ping.</param>
private void pingWorker_DoWork(object o)
{
PingRange pingRange = (PingRange)o;
//
// Get the starting and ending address as a byte array to make it easier to
// loop through.
//
byte[] start = pingRange.StartRange.GetAddressBytes();
byte[] end = pingRange.EndRange.GetAddressBytes();
LinkedList <Thread> threads = new LinkedList <Thread>();
//
// Loop through each octet in the IP address, and ping on a background thread.
//
for (byte o0 = start[0]; o0 <= end[0]; o0++)
{
for (byte o1 = start[1]; o1 <= end[1]; o1++)
{
for (byte o2 = start[2]; o2 <= end[2]; o2++)
{
for (byte o3 = start[3]; o3 <= end[3]; o3++)
{
pingBlock.WaitOne();
Thread t = new Thread(new ParameterizedThreadStart(DoPing));
t.Start(new IPAddress(new byte[] { o0, o1, o2, o3 }));
threads.AddLast(t);
}
}
}
}
//
// Wait until all the pings are done.
//
foreach (Thread ln in threads)
{
ln.Join();
}
//
// Raise an event saying the pings are done on the main UI thread.
//
try
{
this.Invoke(new RaiseNetScanCompleteHandler(RaiseNetScanComplete));
}
catch (InvalidOperationException)
{
// Can happen if the application is closed while pings are going on in
// the background. Safe to ignore.
}
}
/// <summary>
/// Starts ping operations, running on background thread
/// </summary>
/// <param name="pr">Contains the starting and ending IP address for the pings.</param>
public void Start(PingRange pr)
{
Thread t = new Thread(new ParameterizedThreadStart(pingWorker_DoWork));
t.Start(new PingRange(pr.StartRange, pr.EndRange));
}