Advanced Windows Mobile Development

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Advanced Windows Mobile Development

• Maarten Struys
• Windows Embedded Evangelist
• PTS Software

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Agenda

• Introduction
• Challenges in Device Development
• Targeting Multiple Devices
• Introducing LINQ for Devices
• Introducing Unit Testing for Devices
• Conclusions
• QA

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IntroductionDeveloping Windows Mobile Apps

• Use the same development tools as desktop
  developers
• Visual Studio 2005 Visual Studio 2008 Pro or
  better
• Install the Windows Mobile 6 SDKs
• Developer experience identical for desktop and
  Windows Mobile applications
• Fewer UI controls available
• Fewer APIs available
• Target the .NET Compact Framework
• Highly compatible subset of the full .NET
  Framework

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The Real ChallengeWindows Mobile Applications

• Mobile devices introduce new challenges
• Differences in user input capabilities
• Differences in display characteristics
• Differences in feature support
• Preserving battery life

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Targeting Multiple DevicesTouch Screen Support
or Not

• Two philosophies
• Limit application to common features
• Advantage Easy to develop
• Disadvantage Limits user experience
• Application auto-upgrades
• Apps basic design supports nontouch-screen
• App turns on additional features for
  touch-screen
• Advantage Capitalizes on features of each device
• Disadvantage More effort to develop

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Targeting Multiple DevicesAuto Upgrade
Applications

• Create basic nontouch-screen layout
• Determine touch-screen support on startup
• Create additional controls if touch-screen
• Dont over do it
• Focus on simplifying existing features
• Avoid introducing entirely new features
• Be careful not to change UI too much
• Should still feel like the same application

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Demonstration 1

• Creating an Auto Upgrade Application

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LINQ for DevicesIntroduction

• General-purpose query processor built right into
  your favorite programming language
• Flexible
• Extensible
• Familiar SQL-like syntax
• Easy to use for increased productivity
• Type safe
• Syntax check
• IntelliSense support

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LINQ for DevicesWhat is supported?

• Compatible subset of .NET Framework functionality
• LINQ to Objects
• LINQ to XML
• LINQ to DataSets
• Less than 200K in size
• Not Available
• LINQ to Entities
• LINQ to SQL
• Expression trees

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Demonstration 2

• LINQ for Devices

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Unit Testing for DevicesIntroduction

• Unit Testing is a procedure used to validate that
  individual pieces of source code are working
  properly
• A Unit is the smallest testable part of code
• In C and VB.NET methods inside classes
• Calling methods with different parameters and
  examining return values
• Unit Tests are written by the developer of the
  class

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Unit Testing for DevicesExecuting Tests and
Viewing Results

• Unit Tests are started on the development machine
  but will execute on the device
• Test results are displayed inside Visual Studio
• Detailed and summary views available
• Test Lists can be created to logically group unit
  tests together and execute them in one single run

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Unit Testing for DevicesConnecting to the Device

• Make sure to have a connection to the device
• Connect through DMA to the Emulator
• Connect through ActiveSync / Windows Mobile
  Device Center to a physical device
• Make sure that your test are deployed to the
  device using test run settings
• Cant use the device toolbar to select the device
  
• Allows you to specify timeouts for tests as well
• Helps finding connectivity problems or endless
  loops

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Unit Testing for DevicesDebugging Unit Tests

• Automatic debugging of unit tests not supported
• To debug unit tests you need to manually attach
  the debugger
• Add the following registry value on the device
• HKLM\SOFTWARE\Microsoft\.NETCompactFramework\Manag
  ed Debugger\AttachEnabled 1
• Attaching to the debugger
• Prior to the location where you want to break in
  your test, add the following statementSystem.Dia
  gnostics.Debugger.Break()
• Start your test
• When the user break occurs on the device
• Attach the Visual Studio debugger to the test
  host process on the device
• Continue running the test on the device
• Execution will now stop on breakpoints

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Demonstration 3

• Unit Testing for Devices

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Session Summary

• Developing applications for Windows Mobile
  devices is as easy as developing desktop
  applications
• Using Visual Studio 2008 Device Developers are
  true 1st class citizens
• Most of LINQ functionality supported
• Lightweight implementation of WCF available
• Unit Testing for Devices
• Debugging tests is not the best experience right
  now, but we are looking into fixing this

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Next Steps

• Meet me in person during the remainder of DevDays
• Join me and my good friends Jim Wilson and
  Constanze Roman during our preparing for TechEd
  webcast series
• Check all our blogs for the next appointment
• Meet us at TechEd USA or TechEd Europe

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More Information

• Visit us frequently on MSDN for the latest
  developer news, samples, videos, etc.
• http//msdn2.microsoft.com/en-us/windowsmobile/def
  ault.aspx
• Download the Windows Mobile 6 SDKs
• www.microsoft.com/downloads/details.aspx?FamilyID
  06111a3a-a651-4745-88ef-3d48091a390bDisplayLange
  n
• Visit My blog for sample code and more
• http//www.dotnetfordevices.com
• Visit Jim Wilsons blog for cool WM stuff
• http//pluralsight.com/blogs/jimw
• Visit Constanze Romans blog for mobile developer
  news
• http//blogs.msdn.com/croman

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