04 | Handling Files in Windows Store Apps

Jerry Nixon | Microsoft Developer Evangelist

Daren May | President & Co-founder, Crank211

Microsoft

Virtual

Academy

File Namespaces

File Namespaces

• Windows.Storage.StorageFolder– Copy, Move, Rename, Delete

• Windows.Storage.StorageFile

• Copy, Move, Rename, Delete

• Windows.Storage.FileIO– Read, Write, Append methods

• Windows.Storage.Pickers– Folder, save/open File, Third Party

Capabilities and Strategies

• AppxManifest Capabilities

• App Storage (readonly)– “ms-appx://folder/file”

• Local Storage

• “ms-appdata://local/folder/file”

• “ms-appdata://roaming/folder/file”

• “ms-appdata://temp/folder/file”

File Namespaces

Read from Isolated Storage

Read Project Files

With a file picker

Without a picker

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Process Lightcycle Lifecycle Management

The User

Activates

Your App

splash screen

The User

Activates

Your App

splash screen

Trigger Condition

InternetAvailable,

InternetNotAvailable,

SessionConnected,

SessionDisconnected,

UserNotPresent,

UserPresent

TimeTrigger*

PushNotificationTrigger*

SessionStart*

ControlChannelTrigger*(**)

ServicingComplete

SessionConnected

SessionDisconnected

SmsReceived

TimeZoneChange

UserAway/UserPresent,

LockScreenApplicationAdded/Removed

OnlineIdConnectedStateChangeInternetAvailable

InternetAvailable/InternetNotAvailable

NetworkNotificationChannelReset

NetworkStateChange

MaintenanceTrigger

PushNotificationTrigger** *requires lock permission

**can run in App (not BackgroundHost.exe)

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Activating Windows Store Apps

ActivationPrimary

Tile

Secondary

Tile

Toast

Notification

Share

Target

Search

Contract

File

Activation

Protocol

Activation

Resume

File Activation

• AppxManifest Declaration– MIME Type

– Extension (File Type)

– Tool Tip

– Display Name

– Logo

• Reserved Words like: – Com, Exe, Lnk

• Can have command arguments

• Search the Store

Activations

Protocol Activation

• AppxManifest Declaration– Protocol

– Display Name

– Logo

• Reserved Words like: – Ms-windows-store

– InternetShortcut

• Using URL://Data/Data/Data

• Search the Store

Activations

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State Management Strategy

1. Resume as the user left it

2. Start fresh if a long period of time has elapsed

3. Save data when suspending (5 seconds)– Save along the way

4. Release exclusive resources

State Management Guidelines

• Comes with some Visual Studio templates

• RegisterFrame(frame), SaveAsync(), RestoreState()

Helpers :: Suspension manager

• Orientation Events– Visual State Changes

• SaveState(suspension), LoadState(suspension)

Helpers :: Layout aware page

State Management

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