public GeoLocationProvider(GeoLocationAccuracy desiredAccuracy)
{
m_desiredAccuracy = desiredAccuracy;
m_provider = new GeoLocationProviderInternal(desiredAccuracy);
if (SynchronizationContext.Current == null)
{
//
// Create a SynchronizationContext if there isn't one on calling thread
//
m_synchronizationContext = new SynchronizationContext();
}
else
{
m_synchronizationContext = SynchronizationContext.Current;
}
m_provider.StatusChanged += new EventHandler <GeoLocationStatusChangedEventArgs>(OnInternalStatusChanged);
}
// <summary>
// Creates an instance of GeoLocationProviderInternal with the specified desired accuracy
// </summary>
public GeoLocationProviderInternal(GeoLocationAccuracy desiredAccuracy)
{
//
// Create the native location object on a worker thread, so that it exists
// in a multithreaded apartment.
//
m_eventCreateDone = new ManualResetEvent(false);
ThreadPool.QueueUserWorkItem(new WaitCallback(this.CreateHandler), desiredAccuracy);
#if _DEBUG
m_eventCreateDone.WaitOne(5000);
#else
m_eventCreateDone.WaitOne(500);
#endif
Utility.Trace("GeoLocationProviderInternal.ctor: " +
"desiredAccuracy: " + desiredAccuracy.ToString() +
" m_latLongRegistered: " + m_latLongRegistered.ToString() +
" m_civicAddrRegistered: " + m_civicAddrRegistered.ToString() +
" m_latLongStatus: " + m_latLongStatus.ToString() +
" m_curStatus: " + m_curStatus.ToString());
}
/// <summary>
/// Thread pool callback used to ensure location COM API is instantiated from
/// multi-thread apartment, and register for location events.
/// </summary>
/// <param name="state"></param>
private void CreateHandler(object state)
{
lock (this.InternalSyncObject)
{
try
{
m_location = new COMLocation();
}
catch (COMException)
{
Utility.Trace("Failed to CoCreate ILocation COM object.");
}
if (null != m_location)
{
Utility.Trace("Done creating ILocation COM object");
//
// Mapping to platform accuracy
//
GeoLocationAccuracy desiredAccuracy = (GeoLocationAccuracy)state;
DesiredAccuracy accuracy = (desiredAccuracy == GeoLocationAccuracy.Low) ?
DesiredAccuracy.DefaultAccuracy : DesiredAccuracy.HighAccuracy;
Guid reportKey = LocationReportKey.LatLongReport;
m_location.SetDesiredAccuracy(ref reportKey, accuracy);
//
// Always listen for latlong reports
//
if (m_location.RegisterForReport(this, ref reportKey, 0) == 0)
{
m_latLongRegistered = true;
}
//
// Check the latlong status. If latlong reports are not supported, then register
// for civic address reports.
//
m_location.GetReportStatus(ref reportKey, ref m_latLongStatus);
if (ReportStatus.NotSupported == m_latLongStatus)
{
reportKey = LocationReportKey.CivicAddressReport;
if (m_location.RegisterForReport(this, ref reportKey, 0) == 0)
{
m_civicAddrRegistered = true;
m_location.GetReportStatus(ref reportKey, ref m_civicAddrStatus);
}
}
//
// set the current status to the available report type status
//
ReportStatus status = (ReportStatus.NotSupported != m_latLongStatus) ? m_latLongStatus : m_civicAddrStatus;
m_curStatus = m_geoStatusMap[(int)status];
}
Utility.DebugAssert(m_eventCreateDone != null, "m_eventCreateDone is null");
ManualResetEvent eventDone = m_eventCreateDone;
if (eventDone != null)
{
eventDone.Set();
}
}
}
