public async void Run(IBackgroundTaskInstance taskInstance)
{
backgroundTaskInstance = taskInstance;
// Trigger details contain device id and arguments that are provided by the caller in the main app
// The taskInstance can always be casted to DeviceServicingDetails if this background task was started using a DeviceServicingTrigger
deviceServicingDetails = (DeviceServicingDetails)taskInstance.TriggerDetails;
deferral = taskInstance.GetDeferral();
try
{
backgroundTaskInstance.Progress = 0;
cancellationTokenSource = new CancellationTokenSource();
taskInstance.Canceled += new BackgroundTaskCanceledEventHandler(OnCanceled);
// For simplicity, no error checking will be done after opening the device. Ideally, one should always
// check if the device was successfully opened and respond accordingly. For an example on how to do this,
// please see Scenario 1 of this sample.
await OpenDeviceAsync();
// We opened the device, so notify the app that we've completed a bit of the background task
backgroundTaskInstance.Progress = 10;
// Setup the device for firmware update
await SetupDeviceForFirmwareUpdateAsync();
// Write firmware to the device
UInt32 totalBytesWrittenForFirmware = await WriteFirmwareAsync();
// Reset the device so the device loads the updated firmware
await ResetDeviceAsync();
// The device was closed during reset, so clean up our UsbDevice object
CloseDevice();
// Wait for the device to be reenumerated. A device watcher can also be used instead to watch for the device to be reenumerated; that way
// you know when the device is opened instead of guessing like we do here
await Task.Delay(4000);
// We've completed firmware update
backgroundTaskInstance.Progress = 100;
// Reopen the device so we can grab the new revision number because the revision number reflects the firmware verson of the SuperMutt device.
// A consent prompt would normally appear here because we updated the device (revision number was changed in this case), but the Firmware Update API
// allows the background task to open any device that is listed in the device metadata file (the one that allowed this firmware update background task to start)
// without a consent prompt. The consent prompt will still appear if the same device is opened outside the background task.
await OpenDeviceAsync();
var newFirmwareVersion = device.DeviceDescriptor.BcdDeviceRevision;
CloseDevice();
ApplicationData.Current.LocalSettings.Values[LocalSettingKeys.FirmwareUpdateBackgroundTask.TaskStatus] = FirmwareUpdateTaskInformation.TaskCompleted;
ApplicationData.Current.LocalSettings.Values[LocalSettingKeys.FirmwareUpdateBackgroundTask.NewFirmwareVersion] = newFirmwareVersion;
}
catch (OperationCanceledException /*ex*/)
{
ApplicationData.Current.LocalSettings.Values[LocalSettingKeys.FirmwareUpdateBackgroundTask.TaskStatus] = FirmwareUpdateTaskInformation.TaskCanceled;
}
finally
{
// Complete the background task (this raises the OnCompleted event on the corresponding BackgroundTaskRegistration)
deferral.Complete();
}
}
public async void Run(IBackgroundTaskInstance taskInstance)
{
backgroundTaskInstance = taskInstance;
// Trigger details contain device id and arguments that are provided by the caller in the main app
// The taskInstance can always be casted to DeviceServicingDetails if this background task was started using a DeviceServicingTrigger
deviceServicingDetails = (DeviceServicingDetails)taskInstance.TriggerDetails;
deferral = taskInstance.GetDeferral();
try
{
backgroundTaskInstance.Progress = 0;
cancellationTokenSource = new CancellationTokenSource();
taskInstance.Canceled += new BackgroundTaskCanceledEventHandler(OnCanceled);
// For simplicity, no error checking will be done after opening the device. Ideally, one should always
// check if the device was successfully opened and respond accordingly. For an example on how to do this,
// please see Scenario 1 of this sample.
await OpenDeviceAsync();
// We opened the device, so notify the app that we've completed a bit of the background task
backgroundTaskInstance.Progress = 10;
// Setup the device for firmware update
await SetupDeviceForFirmwareUpdateAsync();
// Write firmware to the device
UInt32 totalBytesWrittenForFirmware = await WriteFirmwareAsync();
// Reset the device so the device loads the updated firmware
await ResetDeviceAsync();
// The device was closed during reset, so clean up our UsbDevice object
CloseDevice();
// Wait for the device to be reenumerated. A device watcher can also be used instead to watch for the device to be reenumerated; that way
// you know when the device is opened instead of guessing like we do here
await Task.Delay(4000);
// We've completed firmware update
backgroundTaskInstance.Progress = 100;
// Reopen the device so we can grab the new revision number because the revision number reflects the firmware verson of the SuperMutt device.
// A consent prompt would normally appear here because we updated the device (revision number was changed in this case), but the Firmware Update API
// allows the background task to open any device that is listed in the device metadata file (the one that allowed this firmware update background task to start)
// without a consent prompt. The consent prompt will still appear if the same device is opened outside the background task.
await OpenDeviceAsync();
var newFirmwareVersion = device.DeviceDescriptor.BcdDeviceRevision;
CloseDevice();
ApplicationData.Current.LocalSettings.Values[LocalSettingKeys.FirmwareUpdateBackgroundTask.TaskStatus] = FirmwareUpdateTaskInformation.TaskCompleted;
ApplicationData.Current.LocalSettings.Values[LocalSettingKeys.FirmwareUpdateBackgroundTask.NewFirmwareVersion] = newFirmwareVersion;
}
catch (OperationCanceledException /*ex*/)
{
ApplicationData.Current.LocalSettings.Values[LocalSettingKeys.FirmwareUpdateBackgroundTask.TaskStatus] = FirmwareUpdateTaskInformation.TaskCanceled;
}
finally
{
// Complete the background task (this raises the OnCompleted event on the corresponding BackgroundTaskRegistration)
deferral.Complete();
}
}
