private async void ConnectToDevice_Click(Object sender, RoutedEventArgs eventArgs)
{
var selection = ConnectDevices.SelectedItems;
DeviceListEntry entry = null;
if (selection.Count > 0)
{
var obj = selection[0];
entry = (DeviceListEntry)obj;
if (entry != null)
{
// Create an EventHandlerForDevice to watch for the device we are connecting to
EventHandlerForDevice.CreateNewEventHandlerForDevice();
// Get notified when the device was successfully connected to or about to be closed
EventHandlerForDevice.Current.OnDeviceConnected = this.OnDeviceConnected;
EventHandlerForDevice.Current.OnDeviceClose = this.OnDeviceClosing;
// It is important that the FromIdAsync call is made on the UI thread because the consent prompt can only be displayed
// on the UI thread. Since this method is invoked by the UI, we are already in the UI thread.
Boolean openSuccess = await EventHandlerForDevice.Current.OpenDeviceAsync(entry.DeviceInformation, entry.DeviceSelector);
// Disable connect button if we connected to the device
UpdateConnectDisconnectButtonsAndList(!openSuccess);
}
}
}
private async void OnDeviceClosing(EventHandlerForDevice sender, DeviceInformation deviceInformation)
{
UnregisterFromInterruptEvent();
await rootPage.Dispatcher.RunAsync(
CoreDispatcherPriority.Normal,
new DispatchedHandler(() =>
{
UpdateRegisterEventButton();
ClearSwitchStateTable();
}));
}
/// <summary>
/// If all the devices have been enumerated, select the device in the list we connected to. Otherwise let the EnumerationComplete event
/// from the device watcher handle the device selection
/// </summary>
/// <param name="sender"></param>
/// <param name="deviceInformation"></param>
private void OnDeviceConnected(EventHandlerForDevice sender, DeviceInformation deviceInformation)
{
// Find and select our connected device
if (isAllDevicesEnumerated)
{
SelectDeviceInList(EventHandlerForDevice.Current.DeviceInformation.Id);
ButtonDisconnectFromDevice.Content = ButtonNameDisconnectFromDevice;
}
rootPage.NotifyUser("Currently connected to: " + EventHandlerForDevice.Current.DeviceInformation.Id, NotifyType.StatusMessage);
}
/// <summary>
/// The device was closed. If we will autoreconnect to the device, reflect that in the UI
/// </summary>
/// <param name="sender"></param>
/// <param name="deviceInformation"></param>
private async void OnDeviceClosing(EventHandlerForDevice sender, DeviceInformation deviceInformation)
{
await rootPage.Dispatcher.RunAsync(
CoreDispatcherPriority.Normal,
new DispatchedHandler(() =>
{
// We were connected to the device that was unplugged, so change the "Disconnect from device" button
// to "Do not reconnect to device"
if (ButtonDisconnectFromDevice.IsEnabled && EventHandlerForDevice.Current.IsEnabledAutoReconnect)
{
ButtonDisconnectFromDevice.Content = ButtonNameDisableReconnectToDevice;
}
}));
}
/// <summary>
/// The device was closed. If we will autoreconnect to the device, reflect that in the UI
/// </summary>
/// <param name="sender"></param>
/// <param name="deviceInformation"></param>
private async void OnDeviceClosing(EventHandlerForDevice sender, DeviceInformation deviceInformation)
{
await rootPage.Dispatcher.RunAsync(
CoreDispatcherPriority.Normal,
new DispatchedHandler(() =>
{
// We were connected to the device that was unplugged, so change the "Disconnect from device" button
// to "Do not reconnect to device"
if (ButtonDisconnectFromDevice.IsEnabled && EventHandlerForDevice.Current.IsEnabledAutoReconnect)
{
ButtonDisconnectFromDevice.Content = ButtonNameDisableReconnectToDevice;
}
}));
}
/// <summary>
/// If all the devices have been enumerated, select the device in the list we connected to. Otherwise let the EnumerationComplete event
/// from the device watcher handle the device selection
/// </summary>
/// <param name="sender"></param>
/// <param name="deviceInformation"></param>
private void OnDeviceConnected(EventHandlerForDevice sender, DeviceInformation deviceInformation)
{
// Find and select our connected device
if (isAllDevicesEnumerated)
{
SelectDeviceInList(EventHandlerForDevice.Current.DeviceInformation.Id);
ButtonDisconnectFromDevice.Content = ButtonNameDisconnectFromDevice;
}
rootPage.NotifyUser("Connected to - " +
EventHandlerForDevice.Current.DeviceInformation.Id, NotifyType.StatusMessage);
}
/// <summary>
/// Creates a new instance of EventHandlerForDevice, disables auto reconnect, and uses it as the Current instance.
/// Background tasks do not need to worry about app events, so we will not be registering for app events
/// </summary>
public static void CreateNewEventHandlerForDeviceForBackgroundTasks()
{
eventHandlerForDevice = new EventHandlerForDevice(true);
}
/// <summary>
/// Creates a new instance of EventHandlerForDevice, enables auto reconnect, and uses it as the Current instance.
/// </summary>
public static void CreateNewEventHandlerForDevice()
{
eventHandlerForDevice = new EventHandlerForDevice(false);
}
/// <summary>
/// Reset the buttons when the device is reopened
/// </summary>
/// <param name="sender"></param>
/// <param name="onDeviceConnectedEventArgs"></param>
private void OnDeviceConnected(EventHandlerForDevice sender, DeviceInformation onDeviceConnectedEventArgs)
{
UpdateButtonStates();
}
/// <summary>
/// Creates a new instance of EventHandlerForDevice, disables auto reconnect, and uses it as the Current instance.
/// Background tasks do not need to worry about app events, so we will not be registering for app events
/// </summary>
public static void CreateNewEventHandlerForDeviceForBackgroundTasks()
{
eventHandlerForDevice = new EventHandlerForDevice(true);
}
/// <summary>
/// Creates a new instance of EventHandlerForDevice, enables auto reconnect, and uses it as the Current instance.
/// </summary>
public static void CreateNewEventHandlerForDevice()
{
eventHandlerForDevice = new EventHandlerForDevice(false);
}
private async void OnDeviceClosing(EventHandlerForDevice sender, DeviceInformation deviceInformation)
{
UnregisterFromInterruptEvent();
await rootPage.Dispatcher.RunAsync(
CoreDispatcherPriority.Normal,
new DispatchedHandler(() =>
{
UpdateRegisterEventButton();
ClearSwitchStateTable();
}));
}
/// <summary>
/// Reset the buttons when the device is reopened
/// </summary>
/// <param name="sender"></param>
/// <param name="deviceInformation"></param>
private void OnDeviceConnected(EventHandlerForDevice sender, DeviceInformation deviceInformation)
{
UpdateButtonStates();
}