public async void GetLampUsingSelectionString()
{
//<SnippetGetLampWithSelectionString>
string selectorString = Lamp.GetDeviceSelector();
DeviceInformationCollection devices = await DeviceInformation.FindAllAsync(selectorString);
DeviceInformation deviceInfo =
devices.FirstOrDefault(di => di.EnclosureLocation != null &&
di.EnclosureLocation.Panel == Windows.Devices.Enumeration.Panel.Back);
if (deviceInfo == null)
{
ShowErrorMessage("No Lamp device found");
}
lamp = await Lamp.FromIdAsync(deviceInfo.Id);
//</SnippetGetLampWithSelectionString>
}
private static async void EnableFlashlightAsync(WSANativeColour colour = null)
{
string selectorString = Lamp.GetDeviceSelector();
DeviceInformationCollection devices = await DeviceInformation.FindAllAsync(selectorString);
DeviceInformation deviceInfo =
devices.FirstOrDefault(di => di.EnclosureLocation != null &&
di.EnclosureLocation.Panel == Windows.Devices.Enumeration.Panel.Back);
if (deviceInfo != null)
{
_lamp = await Lamp.FromIdAsync(deviceInfo.Id);
if (_lamp.IsColorSettable && colour != null)
{
_lamp.Color = Windows.UI.Color.FromArgb(255, colour.Red, colour.Green, colour.Blue);
}
_lamp.IsEnabled = true;
}
}
static async Task FindLampAsync()
{
// fail fast
if (hasLoadedLamp)
{
return;
}
Monitor.Enter(locker);
// we may have loaded it while this was waiting to enter
if (hasLoadedLamp)
{
return;
}
// find all the lamps
var selector = Lamp.GetDeviceSelector();
var allLamps = await DeviceInformation.FindAllAsync(selector);
// find all the back lamps
var lampInfo = allLamps.FirstOrDefault(di => di.EnclosureLocation?.Panel == Panel.Back);
if (lampInfo != null)
{
// get the lamp
lamp = await Lamp.FromIdAsync(lampInfo.Id);
}
else
{
// if there is no back lamp, use the default lamp
lamp = await Lamp.GetDefaultAsync();
}
hasLoadedLamp = true;
Monitor.Exit(locker);
}