/// <summary>
/// Method to dispose of current Lamp instance
/// and release all resources
/// </summary>
private void DisposeLamp()
{
lampToggle.IsEnabled = false;
lamp.AvailabilityChanged -= Lamp_AvailabilityChanged;
lamp.IsEnabled = false;
lamp.Dispose();
lamp = null;
}
/// <summary>
/// acquires Lamp instance by getting class selection string
/// for Lamp devices, then selecting the first lamp device on
/// the back of the device
/// </summary>
/// <param name="sender">Contains information regarding button that fired event</param>
/// <param name="e">Contains state information and event data associated with the event</param>
private async void InitLampBtn_Click(object sender, RoutedEventArgs e)
{
try
{
await LogStatusToOutputBoxAsync("Getting class selection string for lamp devices...");
// Returns class selection string for Lamp devices
string selectorStr = Lamp.GetDeviceSelector();
await LogStatusToOutputBoxAsync(string.Format(CultureInfo.InvariantCulture, "Lamp class selection string:\n {0}", selectorStr));
await LogStatusToOutputBoxAsync("Finding all lamp devices...");
// Finds all devices based on lamp class selector string
DeviceInformationCollection devices = await DeviceInformation.FindAllAsync(selectorStr);
await LogStatusToOutputBoxAsync(string.Format(CultureInfo.InvariantCulture, "Number of lamp devices found: {0}", devices.Count.ToString()));
// Select the first lamp device found on the back of the device
await LogStatusToOutputBoxAsync("Selecting first lamp device found on back of the device");
DeviceInformation deviceInfo = devices.FirstOrDefault(di => di.EnclosureLocation != null && di.EnclosureLocation.Panel == Windows.Devices.Enumeration.Panel.Back);
if (deviceInfo == null)
{
throw new InvalidOperationException("Error: No lamp device was found");
}
await LogStatusToOutputBoxAsync(string.Format(CultureInfo.InvariantCulture, "Acquiring Lamp instance from Id:\n {0}", deviceInfo.Id));
Lamp lamp = await Lamp.FromIdAsync(deviceInfo.Id);
await LogStatusAsync(string.Format(CultureInfo.InvariantCulture, "Lamp instance acquired, Device Id:\n {0}", lamp.DeviceId), NotifyType.StatusMessage);
// Here we must Dispose of the lamp object once we are no longer
// using it to release any native resources
await LogStatusToOutputBoxAsync("Disposing of lamp instance");
lamp.Dispose();
lamp = null;
await LogStatusToOutputBoxAsync("Disposed");
}
catch (Exception eX)
{
await LogStatusAsync(eX.Message, NotifyType.ErrorMessage);
}
}
