4. demo

7. Apps do not get notified when
they are getting terminated

8. Registering for Suspend and Resume is
Easy
//Register for the Suspending event and call suspendingHandler when received
Windows.UI.WebUI.WebUIApplication.addEventListener("suspending", suspendingHandler);
//Handle the suspending event and save the current user session using WinJS sessionState
function suspendingHandler(eventArgs) {
//We are getting suspended
}
//Register for the Resuming event and call resumingHandler when received
Windows.UI.WebUI.WebUIApplication.addEventListener("resuming", resumingHandler);
function resumingHandler(
) {
//We are getting resumed, in general do nothing
}

9. Registering for Suspend and Resume is
Easy
// Register for the Suspending event and call OnSuspending when received
// Handle the suspending event and save the current user session using WinJS sessionState
void async
var
//TODO: Save application state and stop any background activity
}
// Register for the Resuming event and call OnResuming when received
void
object
object
{
// We are getting resumed, in general do nothing
}

13. Scenario
You should:

14. User
Launches
App
Splash
screen

20. demo

21. Multiple per
app
System
Trigger
Leaving blank:
BackgroundTaskHost.exe
WinRT Component

22. Yourapp.exe
MyBackgroundTask
WinRTComponent
Create
Call Run()
BackgroundTaskHost.exe
Windows

23. Example
System Trigger
Register on User Login
using Windows.ApplicationModel.Background;
// Specify the trigger
IBackgroundTrigger trigger =
new SystemTrigger(SystemTriggerType.SessionConnected, false);
Create user
login trigger
Associate
trigger with
app code
// Associate app code with the trigger
BackgroundTaskBuilder taskBuilder = new BackgroundTaskBuilder();
taskBuilder.TaskEntryPoint = “MyApp.Background.RegisterForUserLogin";
taskBuilder.SetTrigger(trigger);
taskBuilder.Name = “OnUserPresent";
Register
// Register the task for background execution
trigger
IBackgroundTaskRegistration taskRegistration =
taskBuilder.Register();

24. Example
System Trigger
Background execution on User
Login
using Windows.ApplicationModel.Background;
namespace MyApp.Background
{
public sealed class RegisterForUserLogin: IBackgroundTask
{
public void Run(IBackgroundTaskInstance taskInstance)
{
// Your app code
}
}
}

25. Trigger
Lock screen
Description
UserPresent
X
User becomes present (touches screen, keyboard, mouse)
UserAway
X
User becomes absent or system idle timer expires.
SessionConnected
X
User logs in.
ControlChannelReset
X
Control channel is reset
InternetAvailable
Internet becomes available
NetworkStateChange
Change in connection state (cost, network)
ServicingComplete
App update has finished
OnlineIdConnectedStateChange
Microsoft account connected to logon account has changed.
LockScreenApplicationAdded
An app has been added to the lock screen
LockScreenApplicationRemoved
An app has been removed from the lock screen
TimeZoneChange
The system time zone has changed
SmsReceived
SMS message received by mobile broadband device.
BackgroundWorkCostChange
X
the cost of background work changes

27. CPU resource quota
Lock screen app
Non-lock screen app
Refresh period

28. demo

29. System Condition
Description
InternetAvailable/InternetNotAvailable
Availability of Internet connectivity
UserPresent / UserNotPresent
Presence of user
SessionConnected / SessionDisconnected
User’s logged-on status
FreeNetworkAvailable
Availability of free internet
BackgroundWorkCostNotHigh
Only when on AC

30. var t = new SystemTrigger(SystemTriggerType.NetworkStateChange, false);
var btb = new BackgroundTaskBuilder() {
TaskEntryPoint = "BGComponent.BTC",
Name = "NetworkState Changed" };
btb.SetTrigger(t);
SystemCondition c = new SystemCondition(SystemConditionType.UserPresent);
btb.AddCondition(c);
BackgroundTaskRegistration task = btb.Register();

31. Completed
Yourapp.exe
Progress
MyBackgroundTask
WinRTComponent
Cancel
BackgroundTaskHost.exe
Cancel
Windows

32. demo

33. •
Hardware includes low-power
DRAM, busses, and devices
•
Always connected to the internet
•
App experiences are always fresh
and up to date
•
Transitions instantly between on
and off states (phone-like
behavior)
Requires very low idle
power to enable
Connected Standby

34. • How does this work
in connected standby?
Mobile broadband
Network
(e.g. 3G, 4G, LTE, etc.)
Connectivity
• Nothing special,
one model to stay
connected.
• Need a hardware slot

35. •
Implement a Cancel handler. Cancel all outstanding tasks by using
CancelationTokenSource

39. Longer Battery Life
Always Reachable Apps

40. http://go.microsoft.com/fwlink/?LinkID=227329&clcid=0x409
http://msdn.microsoft.com/en-us/library/windows/apps/hh452975.aspx

41. © 2012 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other
countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond
to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the
date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION