1. 11/19/2018
05 | App Model & Storage
© 2012 Microsoft Corporation. All rights reserved. Microsoft, Windows, 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.

2. Course Topics
Building Windows Store Apps for iOS Developers Jump Start
01 | Introduction to the Windows Store Platform and the tools
02 | C# for Objective-C developers
03 | Async programming & Networking intro
Meal Break, around noon PST 45 to 60 mins
04 | Introduction to XAML & UI Patterns for XAML apps
05 | App Model & Storage
06 | Contracts
07 | Notifications
08 | Windows Store APIs

3. Windows Store app acquisition
Windows Store backend
Package Manager
Windows Store
install
Execution Engine
Extension Handler
stage
Single instance store
register
Registration Information

4. Building blocks of an app package
App Manifest contains all information needed to deploy the app
Blockmap contains hashes of all files within the app package
Signature validates the integrity of the app package
AppXManifest.xml
BlockMap
Signature
Zip Central Directory
Files / Assets
.appx package

5. Inside the App Bundle - iOS

6. Inside the App Package - Windows

7. App manifest and capabilities
Explicitly declares the app integration endpoints
File capabilities (music/pictures/videos/documents libraries, removable storage)
Devices (webcam, microphone, location, sms, proximity); extensible to new device classes
Network and identity (internet, private network, credentials)
File type associations
App contracts (search, share, etc.)
Contained in appxmanifest.xml; Visual Studio provides editor

8. Process Isolation Process1 Process2 OS Contracts Direct APIs Brokers
11/19/2018
Process Isolation
Process1
Local context
Web
context
AppData
Local
Temp
Roaming
Process2
Local context
Web
context
AppData
Local
Temp
Roaming
Contracts
Direct APIs
Brokers OS
User data
Devices
Communications
Handlers
Tiles
Cryptography … …
© 2012 Microsoft Corporation. All rights reserved. Microsoft, Windows, 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.

9. demo Capabilities 11/19/2018 12:03 AM
© 2010 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.

10. App Lifecycle and States
iOS Apps
Windows Store Apps
State
Visible
Receives Events
Executes Code
Not Running No
Active
Yes
Inactive
Mostly
Background
Suspended
State
Visible
Receives Events
App Executes Code
NotRunning No
Running
Yes
(No Necessary Equivalent)
(Accomplished by Background Tasks)
Suspended
Terminated
ClosedByUser

11. Windows Store App Lifecycle
.appx package

12. Process State Transitions
App gets 5s to handle suspend
App is not notified before termination
Running
App
suspending
Suspended
App
Terminated
App
User Launches App
Low Memory
resuming
Apps are notified when they have been resumed
Splash screen
Code gets to run
No code runs
App not running

13. Process State Transitions
11/19/2018
Process State Transitions
App gets 5s to handle suspend
App is not notified before termination
Running
App
suspending
Suspended
App
Terminated
App
User Launches App
Low Resources
resuming
Apps are notified when they have been resumed
Splash screen
Code gets to run
No code runs
App not running
© 2012 Microsoft Corporation. All rights reserved. Microsoft, Windows, 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.

14. Process State Transitions - Simulation
App 1
App 2
App 3 …
App N
Running
Apps suspend after a short delay
Apps resume instantly from suspend
Suspended
App terminated under memory pressure without notification
Terminated

15. Global State Management with SuspensionManager
Saving
MyGame.Common.SuspensionManager.SessionState["gameStatus"]
= GameViewModel.CurrentGameStatus;
Restoring
GameViewModel.CurrentGameStatus =
MyGame.Common.SuspensionManager.SessionState["gameStatus"] as GameStatus;
.appx package

16. The Application.Suspending Event
App.xaml.cs
public App() {
this.InitializeComponent();
this.Suspending += OnSuspending; }
private async void OnSuspending(object sender, SuspendingEventArgs e)
var deferral = e.SuspendingOperation.GetDeferral();
//serializes Page States and SessionState to local StorageFile
await SuspensionManager.SaveAsync();
deferral.Complete();
.appx package

17. Page State Management with SuspensionManager
.appx package

18. Page State Management with SuspensionManager
LayoutAwarePage Code Behind - Saving
protected override void SaveState(Dictionary<String, Object> pageState) {
pageState.Add("greetingOutputText", greetingOutput.Text) }
LayoutAwarePage Code Behind - Restoring
protected override void LoadState(Object navigationParameter,
Dictionary<String, Object> pageState) {
if (pageState == null)
//Do Page State initialization
else
greetingOutput.Text = pageState["greetingOutputText"].ToString(); }
.appx package

19. Restoring State in Windows Store Apps
.appx package

20. Storing User Preferences
iOS - NSUserDefaults
[[NSUserDefaults standardUserDefaults] forKey:MYAppDefaultsUsername];
Windows Store Apps – Local Settings
ApplicationDataContainer settings = ApplicationData.Current.LocalSettings;
settings.Values[”Username"] = ”ejeffers";
Windows Store Apps – Roaming Settings
ApplicationDataContainer settings = ApplicationData.Current.RoamingSettings;
settings.Values[”Username"] = ”ejeffers";

21. demo Suspending and Resuming 11/19/2018 12:03 AM
© 2010 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.

22. Application Activations
Abbreviated iOS activations
Windows Store Apps Activations
.appx package

23. Activation By Contract
.appx package

24. Application Activations – Entry Points
Windows Store App Activations
.appx package

25. The Background Task Contract

26. Background Tasks: Registration
private void RegisterBackgroundTask() {
BackgroundTaskBuilder builder = new BackgroundTaskBuilder();
builder.Name = "FlickrBackgroundSearchTask";
builder.TaskEntryPoint = "FlickrBackgroundTasks.FlickrSearchTask";
IBackgroundTrigger trigger = new TimeTrigger(15, true);
builder.SetTrigger(trigger);
IBackgroundCondition condition = new
SystemCondition(SystemConditionType.InternetAvailable);
builder.AddCondition(condition);
IBackgroundTaskRegistration task = builder.Register(); }

27. Background Tasks: A Simple Implementation
namespace BackgroundTasks {
public sealed class FlickrSearchTask : IBackgroundTask
async void Run(IBackgroundTaskInstance taskInstance)
var _deferral = taskInstance.GetDeferral();
HttpResponseMessage response = await client.GetAsync(queryUrl);
String jsonString = await response.Content.ReadAsStringAsync();
await FileIO.WriteTextAsync(currentSearchResultsFile, jsonString);
updateLiveTile();
_deferral.Complete(); }

28. Background Tasks: Background Task Flow

29. Background Tasks: Trigger Types
Trigger name
Description
TimeTrigger
Trigger Runs on a Timer (15 minute minimum period)
PushNotificationTrigger
A Push Notification was received for the App
ControlChannelTrigger
Chat Programs, Audio
Lock Screen Triggers
Trigger name
Description
InternetAvailable
The Internet becomes available.
NetworkStateChange
A network change such as a change in cost or connectivity occurs.
OnlineIdConnectedStateChange
Online ID associated with the account changes.
SmsReceived
A new SMS message is received by an installed mobile broadband device.
TimeZoneChange
The time zone changes on the device (for example, when the system adjusts the clock for daylight saving time).
System Triggers (non-lock screen)

30. Background Tasks: Resource Limits
CPU Quota
Example Wifi Quota (~1Mbps on battery)

31. Recap: App Model App Package and Model Process Lifecycle
11/19/2018
Recap: App Model
App Package and Model
Process Lifecycle
Background Tasks
Declare Capabilities in AppxManifest
Save State with Suspending Event using Suspension Manager
Use Background Tasks to keep app fresh when not running
© 2012 Microsoft Corporation. All rights reserved. Microsoft, Windows, 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.