/// <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="onDeviceConnectedEventArgs"></param>
private void OnDeviceConnected(EventHandlerForDevice sender, OnDeviceConnectedEventArgs onDeviceConnectedEventArgs)
{
// Find and select our connected device
if (isAllDevicesEnumerated)
{
ButtonDisconnectFromDevice.Content = ButtonNameDisconnectFromDevice;
if (onDeviceConnectedEventArgs.IsDeviceSuccessfullyConnected)
{
SelectDeviceInList(EventHandlerForDevice.Current.DeviceInformation.Id);
UpdateConnectDisconnectButtonsAndList(false);
rootPage.NotifyUser("Currently connected to: " + EventHandlerForDevice.Current.DeviceInformation.Id, NotifyType.StatusMessage);
}
else
{
// Prevent auto reconnect from occuring
EventHandlerForDevice.Current.IsEnabledAutoReconnect = false;
UpdateConnectDisconnectButtonsAndList(true);
}
}
}
/// <summary>
/// This method opens the device using the WinRT Hid API. After the device is opened, save the device
/// so that it can be used across scenarios.
///
/// 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.
///
/// This method is used to reopen the device after the device reconnects to the computer and when the app resumes.
/// </summary>
/// <param name="deviceInfo">Device information of the device to be opened</param>
/// <param name="deviceSelector">The AQS used to find this device</param>
/// <returns>True if the device was successfully opened, false if the device could not be opened for well known reasons.
/// An exception may be thrown if the device could not be opened for extraordinary reasons.</returns>
public async Task<Boolean> OpenDeviceAsync(DeviceInformation deviceInfo, String deviceSelector)
{
// This sample uses FileAccessMode.ReadWrite to open the device because we do not want other apps opening our device and
// changing the state of our device. FileAccessMode.Read can be used instead.
device = await HidDevice.FromIdAsync(deviceInfo.Id, FileAccessMode.ReadWrite);
Boolean successfullyOpenedDevice = false;
NotifyType notificationStatus;
String notificationMessage = null;
// Device could have been blocked by user or the device has already been opened by another app.
if (device != null)
{
successfullyOpenedDevice = true;
deviceInformation = deviceInfo;
this.deviceSelector = deviceSelector;
notificationStatus = NotifyType.StatusMessage;
notificationMessage = "Device " + deviceInformation.Id + " opened";
if (appSuspendEventHandler == null || appResumeEventHandler == null)
{
RegisterForAppEvents();
}
// User can block the device after it has been opened in the Settings charm. We can detect this by registering for the
// DeviceAccessInformation.AccessChanged event
if (deviceAccessEventHandler == null)
{
RegisterForDeviceAccessStatusChange();
}
// Create and register device watcher events for the device to be opened unless we're reopening the device
if (deviceWatcher == null)
{
deviceWatcher = DeviceInformation.CreateWatcher(deviceSelector);
RegisterForDeviceWatcherEvents();
}
if (!watcherStarted)
{
// Start the device watcher after we made sure that the device is opened.
StartDeviceWatcher();
}
}
else
{
successfullyOpenedDevice = false;
notificationStatus = NotifyType.ErrorMessage;
var deviceAccessStatus = DeviceAccessInformation.CreateFromId(deviceInfo.Id).CurrentStatus;
if (deviceAccessStatus == DeviceAccessStatus.DeniedByUser)
{
notificationMessage = "Access to the device was blocked by the user : "******"Access to the device was blocked by the system : " + deviceInfo.Id;
}
else
{
// Most likely the device is opened by another app, but cannot be sure
notificationMessage = "Unknown error, possibly opened by another app : " + deviceInfo.Id;
}
}
MainPage.Current.NotifyUser(notificationMessage, notificationStatus);
// Notify registered callback handle that the device has been opened
if (deviceConnectedCallback != null)
{
var deviceConnectedEventArgs = new OnDeviceConnectedEventArgs(successfullyOpenedDevice, deviceInfo);
deviceConnectedCallback(this, deviceConnectedEventArgs);
}
return successfullyOpenedDevice;
}
/// <summary>
/// This method opens the device using the WinRT Hid API. After the device is opened, save the device
/// so that it can be used across scenarios.
///
/// 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.
///
/// This method is used to reopen the device after the device reconnects to the computer and when the app resumes.
/// </summary>
/// <param name="deviceInfo">Device information of the device to be opened</param>
/// <param name="deviceSelector">The AQS used to find this device</param>
/// <returns>True if the device was successfully opened, false if the device could not be opened for well known reasons.
/// An exception may be thrown if the device could not be opened for extraordinary reasons.</returns>
public async Task <Boolean> OpenDeviceAsync(DeviceInformation deviceInfo, String deviceSelector)
{
// This sample uses FileAccessMode.ReadWrite to open the device because we do not want other apps opening our device and
// changing the state of our device. FileAccessMode.Read can be used instead.
device = await HidDevice.FromIdAsync(deviceInfo.Id, FileAccessMode.ReadWrite);
Boolean successfullyOpenedDevice = false;
NotifyType notificationStatus;
String notificationMessage = null;
// Device could have been blocked by user or the device has already been opened by another app.
if (device != null)
{
successfullyOpenedDevice = true;
deviceInformation = deviceInfo;
this.deviceSelector = deviceSelector;
notificationStatus = NotifyType.StatusMessage;
notificationMessage = "Device " + deviceInformation.Id + " opened";
if (appSuspendEventHandler == null || appResumeEventHandler == null)
{
RegisterForAppEvents();
}
// User can block the device after it has been opened in the Settings charm. We can detect this by registering for the
// DeviceAccessInformation.AccessChanged event
if (deviceAccessEventHandler == null)
{
RegisterForDeviceAccessStatusChange();
}
// Create and register device watcher events for the device to be opened unless we're reopening the device
if (deviceWatcher == null)
{
deviceWatcher = DeviceInformation.CreateWatcher(deviceSelector);
RegisterForDeviceWatcherEvents();
}
if (!watcherStarted)
{
// Start the device watcher after we made sure that the device is opened.
StartDeviceWatcher();
}
}
else
{
successfullyOpenedDevice = false;
notificationStatus = NotifyType.ErrorMessage;
var deviceAccessStatus = DeviceAccessInformation.CreateFromId(deviceInfo.Id).CurrentStatus;
if (deviceAccessStatus == DeviceAccessStatus.DeniedByUser)
{
notificationMessage = "Access to the device was blocked by the user : "******"Access to the device was blocked by the system : " + deviceInfo.Id;
}
else
{
// Most likely the device is opened by another app, but cannot be sure
notificationMessage = "Unknown error, possibly opened by another app : " + deviceInfo.Id;
}
}
MainPage.Current.NotifyUser(notificationMessage, notificationStatus);
// Notify registered callback handle that the device has been opened
if (deviceConnectedCallback != null)
{
var deviceConnectedEventArgs = new OnDeviceConnectedEventArgs(successfullyOpenedDevice, deviceInfo);
deviceConnectedCallback(this, deviceConnectedEventArgs);
}
return(successfullyOpenedDevice);
}
/// <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="onDeviceConnectedEventArgs"></param>
private void OnDeviceConnected(EventHandlerForDevice sender, OnDeviceConnectedEventArgs onDeviceConnectedEventArgs)
{
// Find and select our connected device
if (isAllDevicesEnumerated)
{
ButtonDisconnectFromDevice.Content = ButtonNameDisconnectFromDevice;
if (onDeviceConnectedEventArgs.IsDeviceSuccessfullyConnected)
{
SelectDeviceInList(EventHandlerForDevice.Current.DeviceInformation.Id);
UpdateConnectDisconnectButtonsAndList(false);
rootPage.NotifyUser("Currently connected to: " + EventHandlerForDevice.Current.DeviceInformation.Id, NotifyType.StatusMessage);
}
else
{
// Prevent auto reconnect from occuring
EventHandlerForDevice.Current.IsEnabledAutoReconnect = false;
UpdateConnectDisconnectButtonsAndList(true);
}
}
}
