private async void DeviceWatcher_Removed(DeviceWatcher sender, DeviceInformationUpdate deviceInfoUpdate)
{
await DeviceListPage.dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
{
lock (this)
{
// Debug.WriteLine(String.Format("Updated {0}{1}", deviceInfoUpdate.Id, ""));
// Protect against race condition if the task runs after the app stopped the deviceWatcher.
if (sender == deviceWatcher)
{
BLEDeviceInfo bleDeviceDisplay = FindBluetoothLEDeviceDisplay(deviceInfoUpdate.Id);
if (bleDeviceDisplay != null)
{
// Device is already being displayed - update UX.
BLEDevices.Remove(bleDeviceDisplay);
NotifyStatusMessage?.Invoke(bleDeviceDisplay.Name + " Removed.");
return;
}
DeviceInformation deviceInfo = FindUnknownDevices(deviceInfoUpdate.Id);
if (deviceInfo != null)
{
BLEUnknownDevices.Remove(deviceInfo);
NotifyStatusMessage?.Invoke(deviceInfo.Id + " Removed.");
}
}
}
});
}
private async void DeviceWatcher_Updated(DeviceWatcher sender, DeviceInformationUpdate deviceInfoUpdate)
{
await DeviceListPage.dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
{
lock (this)
{
// Debug.WriteLine(String.Format("Updated {0}{1}", deviceInfoUpdate.Id, ""));
// Protect against race condition if the task runs after the app stopped the deviceWatcher.
if (sender == deviceWatcher)
{
BLEDeviceInfo bleDeviceDisplay = FindBluetoothLEDeviceDisplay(deviceInfoUpdate.Id);
if (bleDeviceDisplay != null)
{
// Device is already being displayed - update UX.
bleDeviceDisplay.Update(deviceInfoUpdate);
return;
}
DeviceInformation deviceInfo = FindUnknownDevices(deviceInfoUpdate.Id);
if (deviceInfo != null)
{
// If device has been updated with a friendly name it's no longer unknown.
if (deviceInfo.Name != String.Empty)
{
NotifyStatusMessage?.Invoke("device found:" + deviceInfo.Name);
deviceInfo.Update(deviceInfoUpdate);
BLEDevices.Add(new BLEDeviceInfo(deviceInfo));
BLEUnknownDevices.Remove(deviceInfo);
}
}
}
}
});
}
public void StartDeviceSearch()
{
StopDeviceSearch();
string[] requestedProperties = { "System.Devices.Aep.DeviceAddress", "System.Devices.Aep.IsConnected", "System.Devices.Aep.Bluetooth.Le.IsConnectable" };
// BT_Code: Example showing paired and non-paired in a single query.
string aqsAllBluetoothLEDevices = "(System.Devices.Aep.ProtocolId:=\"{bb7bb05e-5972-42b5-94fc-76eaa7084d49}\")";
deviceWatcher = DeviceInformation.CreateWatcher(aqsAllBluetoothLEDevices,
requestedProperties,
DeviceInformationKind.AssociationEndpoint);
deviceWatcher.Added += DeviceWatcher_Added;
deviceWatcher.Updated += DeviceWatcher_Updated;
deviceWatcher.Removed += DeviceWatcher_Removed;
deviceWatcher.EnumerationCompleted += DeviceWatcher_EnumerationCompleted;
deviceWatcher.Stopped += DeviceWatcher_Stopped;
BLEDevices.Clear();
deviceWatcher.Start();
NotifyStatusMessage?.Invoke("Device Search Initiated.");
}
private async void DeviceWatcher_Added(DeviceWatcher sender, DeviceInformation devinfo)
{
await DeviceListPage.dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
{
lock (this)
{
if (!string.IsNullOrEmpty(devinfo.Name))
{
NotifyStatusMessage?.Invoke("device found:" + devinfo.Name);
BLEDevices.Add(new BLEDeviceInfo(devinfo));
// Debug.WriteLine("Name: {0} Id {1}", devinfo.Name, devinfo.Id);
}
else
{
// Add it to a list in case the name gets updated later.
BLEUnknownDevices.Add(devinfo);
}
}
});
}
