/// <summary>
/// Checks whether the compass is supported or not, initialises and
/// starts it.
/// </summary>
private void InitializeAndStartCompass()
{
if (Microsoft.Devices.Sensors.Compass.IsSupported)
{
// Setup and start the compass
_compass = new Microsoft.Devices.Sensors.Compass();
try
{
_compass.TimeBetweenUpdates = TimeSpan.FromMilliseconds(CompassUpdateInterval);
}
catch (InvalidOperationException e)
{
Debug.WriteLine(DebugTag + "MainPage(): Failed to set compass update interval: "
+ e.ToString());
}
// Set call backs for events
_compass.Calibrate +=
new EventHandler<CalibrationEventArgs>(OnCalibrate);
_compass.CurrentValueChanged +=
new EventHandler<SensorReadingEventArgs<CompassReading>>(
OnCompassReadingChanged);
try
{
_compass.Start();
}
catch (InvalidOperationException)
{
MessageBox.Show(AppResources.FailedToStartCompassMessage);
}
}
else
{
MessageBox.Show(AppResources.NoCompassMessage);
}
}
public void getHeading(string options)
{
if (!DeviceCompass.IsSupported)
{
DispatchCommandResult(new PluginResult(PluginResult.Status.ERROR, Not_Supported));
}
else
{
if (compass == null)
{
// Instantiate the compass.
compass = new DeviceCompass();
compass.TimeBetweenUpdates = TimeSpan.FromMilliseconds(40);
compass.CurrentValueChanged += new EventHandler <Microsoft.Devices.Sensors.SensorReadingEventArgs <Microsoft.Devices.Sensors.CompassReading> >(compass_CurrentValueChanged);
compass.Calibrate += new EventHandler <Microsoft.Devices.Sensors.CalibrationEventArgs>(compass_Calibrate);
}
compass.Start();
}
try
{
if (currentStatus != Running)
{
int status = this.start();
if (status == ErrorFailedToStart)
{
DispatchCommandResult(new PluginResult(PluginResult.Status.IO_EXCEPTION, ErrorFailedToStart));
return;
}
long timeout = 2000;
while ((currentStatus == Starting) && (timeout > 0))
{
timeout = timeout - 100;
Thread.Sleep(100);
}
if (currentStatus != Running)
{
DispatchCommandResult(new PluginResult(PluginResult.Status.IO_EXCEPTION, ErrorFailedToStart));
return;
}
}
lock (compass)
{
if (watchers.ContainsKey(getCompassId))
{
compass.CurrentValueChanged -= watchers[getCompassId].compass_CurrentValueChanged;
watchers.Remove(getCompassId);
}
DispatchCommandResult(new PluginResult(PluginResult.Status.OK, GetHeadingFormatted(compass.CurrentValue)));
}
}
catch (UnauthorizedAccessException)
{
DispatchCommandResult(new PluginResult(PluginResult.Status.ILLEGAL_ACCESS_EXCEPTION, ErrorFailedToStart));
}
catch (Exception)
{
DispatchCommandResult(new PluginResult(PluginResult.Status.ERROR, ErrorFailedToStart));
}
}
