private bool StartNext(PingerEntry pinger)
{
if (_nextToScan == null)
{
return(false);
}
if (_aliveHosts.ContainsKey(_nextToScan))
{
IPScanHostState results = _aliveHosts[_nextToScan];
results.Prepare();
pinger._results = results;
}
else
{
pinger._results = new IPScanHostState(_nextToScan, _pingsPerScan, _timeout);
}
RaiseOnScanProgressUpdate(_nextToScan);
_nextToScan = _range.GetNext(_nextToScan);
_activePings++;
pinger._ping.SendAsync(pinger._results.Address, _timeout, _pingBuffer, _pingOptions, pinger);
return(true);
}
private void RaiseOnAliveHostFound(IPScanHostState host)
{
if (OnAliveHostFound != null)
{
OnAliveHostFound(this, host);
}
}
void pinger_PingCompleted(object sender, PingCompletedEventArgs e)
{
PingerEntry pinger = (PingerEntry)e.UserState;
IPScanHostState results = pinger._results;
bool raiseEvent = false;
results.StorePingResult(e.Reply.Status == IPStatus.Success ? e.Reply.RoundtripTime : -1);
lock (_resultsLock)
{
if (!results.IsTesting())
{
if (results.IsAlive())
{
raiseEvent = !_aliveHosts.ContainsKey(results.Address);
if (raiseEvent)
{
_aliveHosts.Add(results.Address, results);
}
}
else
{
_aliveHosts.Remove(results.Address);
}
--_activePings;
if (!_active)
{
if (_activePings == 0)
{
_stopEvent.Set();
RaiseOnStopScan();
}
}
else
{
if (_nextToScan == null)
{
if (_activePings == 0)
{
if (_continuousScan)
{
RaiseOnRestartScan();
Restart();
}
else
{
_active = false;
_stopEvent.Set();
RaiseOnStopScan();
}
}
}
else
{
StartNext(pinger);
}
}
}
else
{
pinger._ping.SendAsync(pinger._results.Address, _timeout, _pingBuffer, _pingOptions, pinger);
}
}
if (raiseEvent)
{
RaiseOnAliveHostFound(results);
}
}