private void ScanThreadProc()
{
lock (m_syncRoot)
{
Debug.WriteLine("+WiFiService.ScanThreadProc");
Scanning = true;
do
{
if (m_wzc == null)
{
break;
}
if (!WiFiEnabled)
{
break;
}
try
{
var et = Environment.TickCount;
if (m_currentAPs == null)
{
m_currentAPs = m_wzc.NearbyAccessPoints;
}
else
{
m_currentAPs.Refresh();
}
if (!WiFiEnabled)
{
break;
}
var added = m_currentAPs.Except(m_knownAPs);
var lost = m_knownAPs.Except(m_currentAPs);
var updated = m_knownAPs.Intersect(m_currentAPs);
m_knownAPs = m_currentAPs.ToList();
RaisePropertyChanged("KnownAPs");
var handler = ScanComplete;
et = Environment.TickCount - et;
Debug.WriteLine(string.Format("Network scan took {0}ms", et));
if (!WiFiEnabled)
{
break;
}
if (handler != null)
{
ThreadPool.QueueUserWorkItem(delegate
{
handler(added.ToArray(), lost.ToArray(), updated.ToArray());
});
}
}
catch (Exception ex)
{
Debug.WriteLine(string.Format("Exception in WiFi network scan. If you disabled the adapter, you can ignore this error: ", ex.Message));
// if we disable the WiFi adapter while this loop is executing, bad things can happen
// it's better to just catch around the whole thing and ignore
if (!WiFiEnabled)
{
break;
}
}
} while (!m_stopScanEvent.WaitOne(ScanPeriod, false));
Debug.WriteLine("-WiFiService.ScanThreadProc");
Scanning = false;
m_currentAPs = null;
}
}
internal unsafe void RefreshListPreferred(bool nearbyOnly)
{
// If the caller wants only the local preferred APs,
// we check nearby list and, if the AP is not there,
// we don't add it to our own preferred list.
AccessPointCollection apc = null;
if (nearbyOnly)
{
apc = adapter.NearbyAccessPoints;
}
// First step is to get the INTF_ENTRY for the adapter.
// This includes the list of preferred SSID values.
INTF_ENTRY ie = INTF_ENTRY.GetEntry(this.adapter.Name);
// The field rdStSSIDList is the preferred list. It comes
// in the form of a WZC_802_11_CONFIG_LIST.
RAW_DATA rd = ie.rdStSSIDList;
WZC_WLAN_CONFIG_LIST cl = new WZC_WLAN_CONFIG_LIST(rd);
// Step through the list and add a new AP to the
// collection for each entry.
for (int i = 0; i < cl.NumberOfItems; i++)
{
WZC_WLAN_CONFIG c = cl.Item(0);
// Get a NDIS_WLAN_BSSID corresponding to the
// part of the WZC_WLAN_CONFIG entry and use that
// to build an AccessPoint instance for this
// entry.
NDIS_WLAN_BSSID bssid = c.ToBssid();
// If we're only showing those which we can hear,
// see if the current SSID is in the nearby list.
if (nearbyOnly)
{
// Find the currently active AP with the SSID
// to match the one we're working on.
AccessPoint activeAP = apc.FindBySSID(bssid.SSID);
int ss;
// If the given SSID is not in range, don't add
// an entry to the list.
if (activeAP != null)
{
// Update signal strength.
ss = activeAP.SignalStrengthInDecibels;
// Copy the signal strength value to the
// NDIS_WLAN_BSSID structure for the
// preferred list entry.
bssid.Rssi = ss;
// Create the AP instance and add it to the
// preferred list.
AccessPoint ap = new AccessPoint(bssid);
this.List.Add(ap);
}
}
else
{
// Create the AP instance and add it to the
// preferred list. The signal strength will
// not necessarily be valid.
AccessPoint ap = new AccessPoint(bssid);
this.List.Add(ap);
}
}
}
