A Developer&#x27;s View of Windows 8

Source codes for the demos are available at http://lunarfrog.com/blog/2011/12/01/cttdnug-presentation/

Technology

A Developer's View of Windows
8

Andrei Marukovich
andrei.marukovich@lunarfrog.com
@taggedfrog

Agenda
• Developing for Classic Desktop
• Introduction to Metro UI
• Building Metro applications

2

Windows 8 platform

HTML /
C# / VB JS
C / C++
or
SL
Metro-style APIs

CLR Internet
Win32
Explorer

Windows Kernel Services

4

.NET 4.5 Framework
• Pre-installed in Windows 8
• Windows XP is not supported
• Use 4.0 runtime (same as 3.5 use 2.0 RT)

5

Asynchronous development
• New data structures
• New async APIs
• New keywords in C# and VB
• async
• await

6

If it runs on a Windows 7,
it'll run on Windows 8 PC

8

App suspension
• Inactive apps are suspended by the OS:
• Apps remain in memory
• No CPU, Disk or Network consumed
• All threads are suspended

10

App lifecycle states

Not started Running

Suspending

Suspended

11

Windows 8 platform

HTML /
C# / VB JS
Languages C / C++
or
SL

WinRT APIs
CLR Internet
Communication Graphics/Media Devices Win32
Explorer
Application Model

Windows Kernel Services

13

WinRT
• Object-oriented Win32 replacement
• Native, written in C++
• Based on COM
• .NET-like metadata
• Any language can be used to extend it
• Async everywhere (50ms rule)

14

Windows 8 platform

HTML / CSS DirectX XAML HTML /
C# / VB JS
C / C++
JavaScript C# / VB or
C / C++
IE 10 Engine CLR SL

WinRT APIs
CLR Internet
Communication Graphics/Media Devices Win32
Explorer
Application Model

Windows Kernel Services

15

XAML for Metro
• New variation of XAML, close to Silverlight
• Standard controls
• Button, TextBox, ComboBox, CheckBox, etc.
• New controls
• ProgressRing
• FlipView
• GridView
• ListView

17

Demo
• Image Browser
• Scans Pictures library and shows all the
keywords
• Allows to select a keyword
• Shows all the images for the keyword
• Snapping
• Search integration
• FilePicker integration

18

App packaging
• .appx file format (zip)

Files / Assets
• Compiled app and
resources
• App Manifest
AppXManifest.xml
• BlockMap
BlockMap
• Digital signature
Signature

.appx package

20

Installation
• Declarative approach
• Everything installed in one folder
• Installation is on per-user basis
• Installation for first user
• Registration for the next
• No custom actions
• Automatic updates

21

How to start
• Main start point: http://dev.windows.com/
• Samples
• Metro style app reference and APIs
• Forums
• Windows 8 Developer Preview with developer
tools (x64)

• Installation on a VM
• VirtualBox 4.1.2+
• VMware Workstation 8.0+
• Hyper-V 22

Links
• BUILD conference videos
• http://channel9.msdn.com/Events/BUILD/BUILD2011
• 8 Traits of Great Metro Style Apps (Jensen Harris)

• Building Windows 8 blog
• http://blogs.msdn.com/b/b8/

23

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