private void StartWatcher()
{
DeviceWatcherEventKind[] triggerEventKinds = { DeviceWatcherEventKind.Add, DeviceWatcherEventKind.Remove, DeviceWatcherEventKind.Update };
DeviceWatcher deviceWatcher = null;
startWatcherButton.IsEnabled = false;
// First get the device selector chosen by the UI.
DeviceSelectorInfo deviceSelectorInfo = (DeviceSelectorInfo)selectorComboBox.SelectedItem;
if (null == deviceSelectorInfo.Selector)
{
// If the a pre-canned device class selector was chosen, call the DeviceClass overload
deviceWatcher = DeviceInformation.CreateWatcher(deviceSelectorInfo.DeviceClassSelector);
}
else if (deviceSelectorInfo.Kind == DeviceInformationKind.Unknown)
{
// Use AQS string selector from dynamic call to a device api's GetDeviceSelector call
// Kind will be determined by the selector
deviceWatcher = DeviceInformation.CreateWatcher(
deviceSelectorInfo.Selector,
null // don't request additional properties for this sample
);
}
else
{
// Kind is specified in the selector info
deviceWatcher = DeviceInformation.CreateWatcher(
deviceSelectorInfo.Selector,
null, // don't request additional properties for this sample
deviceSelectorInfo.Kind);
}
// Get the background trigger for this watcher
DeviceWatcherTrigger deviceWatcherTrigger = deviceWatcher.GetBackgroundTrigger(triggerEventKinds);
rootPage.NotifyUser("Starting Watcher...", NotifyType.StatusMessage);
// Register this trigger for our background task
RegisterBackgroundTask(deviceWatcherTrigger);
stopWatcherButton.IsEnabled = true;
rootPage.NotifyUser("Watcher started...", NotifyType.StatusMessage);
}
private void StartWatcher()
{
startWatcherButton.IsEnabled = false;
ResultCollection.Clear();
// Get the device selector chosen by the UI then add additional constraints for devices that
// can be paired or are already paired.
DeviceSelectorInfo deviceSelectorInfo = (DeviceSelectorInfo)selectorComboBox.SelectedItem;
string selector = "(" + deviceSelectorInfo.Selector + ")" + " AND (System.Devices.Aep.CanPair:=System.StructuredQueryType.Boolean#True OR System.Devices.Aep.IsPaired:=System.StructuredQueryType.Boolean#True)";
if (deviceSelectorInfo.Kind == DeviceInformationKind.Unknown)
{
// Kind will be determined by the selector
deviceWatcher = DeviceInformation.CreateWatcher(
selector,
null // don't request additional properties for this sample
);
}
else
{
// Kind is specified in the selector info
deviceWatcher = DeviceInformation.CreateWatcher(
selector,
null, // don't request additional properties for this sample
deviceSelectorInfo.Kind);
}
// Hook up handlers for the watcher events before starting the watcher
handlerAdded = new TypedEventHandler <DeviceWatcher, DeviceInformation>(async(watcher, deviceInfo) =>
{
// Since we have the collection databound to a UI element, we need to update the collection on the UI thread.
await rootPage.Dispatcher.RunAsync(CoreDispatcherPriority.Low, () =>
{
ResultCollection.Add(new DeviceInformationDisplay(deviceInfo));
rootPage.NotifyUser(
String.Format("{0} devices found.", ResultCollection.Count),
NotifyType.StatusMessage);
});
});
deviceWatcher.Added += handlerAdded;
handlerUpdated = new TypedEventHandler <DeviceWatcher, DeviceInformationUpdate>(async(watcher, deviceInfoUpdate) =>
{
// Since we have the collection databound to a UI element, we need to update the collection on the UI thread.
await rootPage.Dispatcher.RunAsync(CoreDispatcherPriority.Low, () =>
{
// Find the corresponding updated DeviceInformation in the collection and pass the update object
// to the Update method of the existing DeviceInformation. This automatically updates the object
// for us.
foreach (DeviceInformationDisplay deviceInfoDisp in ResultCollection)
{
if (deviceInfoDisp.Id == deviceInfoUpdate.Id)
{
deviceInfoDisp.Update(deviceInfoUpdate);
// If the item being updated is currently "selected", then update the pairing buttons
DeviceInformationDisplay selectedDeviceInfoDisp = (DeviceInformationDisplay)resultsListView.SelectedItem;
if (deviceInfoDisp == selectedDeviceInfoDisp)
{
UpdatePairingButtons();
}
break;
}
}
});
});
deviceWatcher.Updated += handlerUpdated;
handlerRemoved = new TypedEventHandler <DeviceWatcher, DeviceInformationUpdate>(async(watcher, deviceInfoUpdate) =>
{
// Since we have the collection databound to a UI element, we need to update the collection on the UI thread.
await rootPage.Dispatcher.RunAsync(CoreDispatcherPriority.Low, () =>
{
// Find the corresponding DeviceInformation in the collection and remove it
foreach (DeviceInformationDisplay deviceInfoDisp in ResultCollection)
{
if (deviceInfoDisp.Id == deviceInfoUpdate.Id)
{
ResultCollection.Remove(deviceInfoDisp);
break;
}
}
rootPage.NotifyUser(
String.Format("{0} devices found.", ResultCollection.Count),
NotifyType.StatusMessage);
});
});
deviceWatcher.Removed += handlerRemoved;
handlerEnumCompleted = new TypedEventHandler <DeviceWatcher, Object>(async(watcher, obj) =>
{
await rootPage.Dispatcher.RunAsync(CoreDispatcherPriority.Low, () =>
{
rootPage.NotifyUser(
String.Format("{0} devices found. Enumeration completed. Watching for updates...", ResultCollection.Count),
NotifyType.StatusMessage);
});
});
deviceWatcher.EnumerationCompleted += handlerEnumCompleted;
handlerStopped = new TypedEventHandler <DeviceWatcher, Object>(async(watcher, obj) =>
{
await rootPage.Dispatcher.RunAsync(CoreDispatcherPriority.Low, () =>
{
rootPage.NotifyUser(
String.Format("{0} devices found. Watcher {1}.",
ResultCollection.Count,
DeviceWatcherStatus.Aborted == watcher.Status ? "aborted" : "stopped"),
NotifyType.StatusMessage);
});
});
deviceWatcher.Stopped += handlerStopped;
rootPage.NotifyUser("Starting Watcher...", NotifyType.StatusMessage);
deviceWatcher.Start();
stopWatcherButton.IsEnabled = true;
}
private async void ShowDevicePicker(bool pickSingle)
{
showDevicePickerButton.IsEnabled = false;
ResultCollection.Clear();
devicePicker = new DevicePicker();
// First get the device selector chosen by the UI.
DeviceSelectorInfo deviceSelectorInfo = (DeviceSelectorInfo)selectorComboBox.SelectedItem;
if (null == deviceSelectorInfo.Selector)
{
// If the a pre-canned device class selector was chosen, call the DeviceClass overload
devicePicker.Filter.SupportedDeviceClasses.Add(deviceSelectorInfo.DeviceClassSelector);
}
else
{
// Use AQS string selector from dynamic call to a device api's GetDeviceSelector call
devicePicker.Filter.SupportedDeviceSelectors.Add(deviceSelectorInfo.Selector);
}
rootPage.NotifyUser("Showing Device Picker", NotifyType.StatusMessage);
// Calculate the position to show the picker (right below the buttons)
GeneralTransform ge = pickSingleDeviceButton.TransformToVisual(null);
Point point = ge.TransformPoint(new Point());
Rect rect = new Rect(point, new Point(point.X + pickSingleDeviceButton.ActualWidth, point.Y + pickSingleDeviceButton.ActualHeight));
if (pickSingle)
{
DeviceInformation di = await devicePicker.PickSingleDeviceAsync(rect);
if (null != di)
{
ResultCollection.Add(new DeviceInformationDisplay(di));
}
showDevicePickerButton.IsEnabled = true;
}
else
{
devicePicker.DevicePickerDismissed += new TypedEventHandler <DevicePicker, object>(
async(picker, obj) =>
{
// Since we have the collection databound to a UI element, we need to update the collection on the UI thread.
await rootPage.Dispatcher.RunAsync(CoreDispatcherPriority.Low, () =>
{
showDevicePickerButton.IsEnabled = true;
rootPage.NotifyUser("Hiding Device Picker", NotifyType.StatusMessage);
});
});
devicePicker.DeviceSelected += new TypedEventHandler <DevicePicker, DeviceSelectedEventArgs>(
async(picker, args) =>
{
// Since we have the collection databound to a UI element, we need to update the collection on the UI thread.
await rootPage.Dispatcher.RunAsync(CoreDispatcherPriority.Low, () =>
{
ResultCollection.Clear();
ResultCollection.Add(new DeviceInformationDisplay(args.SelectedDevice));
});
});
// Show the picker
devicePicker.Show(rect);
}
}
private void StartWatcher()
{
startWatcherButton.IsEnabled = false;
ResultCollection.Clear();
// First get the device selector chosen by the UI.
DeviceSelectorInfo deviceSelectorInfo = (DeviceSelectorInfo)selectorComboBox.SelectedItem;
if (null == deviceSelectorInfo.Selector)
{
// If the a pre-canned device class selector was chosen, call the DeviceClass overload
deviceWatcher = DeviceInformation.CreateWatcher(deviceSelectorInfo.DeviceClassSelector);
}
else if (deviceSelectorInfo.Kind == DeviceInformationKind.Unknown)
{
// Use AQS string selector from dynamic call to a device api's GetDeviceSelector call
// Kind will be determined by the selector
deviceWatcher = DeviceInformation.CreateWatcher(
deviceSelectorInfo.Selector,
null // don't request additional properties for this sample
);
}
else
{
// Kind is specified in the selector info
deviceWatcher = DeviceInformation.CreateWatcher(
deviceSelectorInfo.Selector,
null, // don't request additional properties for this sample
deviceSelectorInfo.Kind);
}
// Hook up handlers for the watcher events before starting the watcher
handlerAdded = new TypedEventHandler <DeviceWatcher, DeviceInformation>(async(watcher, deviceInfo) =>
{
// Since we have the collection databound to a UI element, we need to update the collection on the UI thread.
await rootPage.Dispatcher.RunAsync(CoreDispatcherPriority.Low, () =>
{
ResultCollection.Add(new DeviceInformationDisplay(deviceInfo));
rootPage.NotifyUser(
String.Format("{0} devices found.", ResultCollection.Count),
NotifyType.StatusMessage);
});
});
deviceWatcher.Added += handlerAdded;
handlerUpdated = new TypedEventHandler <DeviceWatcher, DeviceInformationUpdate>(async(watcher, deviceInfoUpdate) =>
{
// Since we have the collection databound to a UI element, we need to update the collection on the UI thread.
await rootPage.Dispatcher.RunAsync(CoreDispatcherPriority.Low, () =>
{
// Find the corresponding updated DeviceInformation in the collection and pass the update object
// to the Update method of the existing DeviceInformation. This automatically updates the object
// for us.
foreach (DeviceInformationDisplay deviceInfoDisp in ResultCollection)
{
if (deviceInfoDisp.Id == deviceInfoUpdate.Id)
{
deviceInfoDisp.Update(deviceInfoUpdate);
break;
}
}
});
});
deviceWatcher.Updated += handlerUpdated;
handlerRemoved = new TypedEventHandler <DeviceWatcher, DeviceInformationUpdate>(async(watcher, deviceInfoUpdate) =>
{
// Since we have the collection databound to a UI element, we need to update the collection on the UI thread.
await rootPage.Dispatcher.RunAsync(CoreDispatcherPriority.Low, () =>
{
// Find the corresponding DeviceInformation in the collection and remove it
foreach (DeviceInformationDisplay deviceInfoDisp in ResultCollection)
{
if (deviceInfoDisp.Id == deviceInfoUpdate.Id)
{
ResultCollection.Remove(deviceInfoDisp);
break;
}
}
rootPage.NotifyUser(
String.Format("{0} devices found.", ResultCollection.Count),
NotifyType.StatusMessage);
});
});
deviceWatcher.Removed += handlerRemoved;
handlerEnumCompleted = new TypedEventHandler <DeviceWatcher, Object>(async(watcher, obj) =>
{
await rootPage.Dispatcher.RunAsync(CoreDispatcherPriority.Low, () =>
{
rootPage.NotifyUser(
String.Format("{0} devices found. Enumeration completed. Watching for updates...", ResultCollection.Count),
NotifyType.StatusMessage);
});
});
deviceWatcher.EnumerationCompleted += handlerEnumCompleted;
handlerStopped = new TypedEventHandler <DeviceWatcher, Object>(async(watcher, obj) =>
{
await rootPage.Dispatcher.RunAsync(CoreDispatcherPriority.Low, () =>
{
rootPage.NotifyUser(
String.Format("{0} devices found. Watcher {1}.",
ResultCollection.Count,
DeviceWatcherStatus.Aborted == watcher.Status ? "aborted" : "stopped"),
NotifyType.StatusMessage);
});
});
deviceWatcher.Stopped += handlerStopped;
rootPage.NotifyUser("Starting Watcher...", NotifyType.StatusMessage);
deviceWatcher.Start();
stopWatcherButton.IsEnabled = true;
}