Windows Phone 8 开发技术内幕揭秘

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WinPhone8 开发技术资料 WinPhone8 开发技术资料是 Windows Phone 8 开发平台的详细指南，涵盖了 Windows Phone 8 开发的方方面面。本书籍从 Windows Phone 8 的架构和设计理念开始，详细介绍了 Windows Phone 8 应用的开发、部署和维护。第 1 章：视觉和架构本章节介绍了 Windows Phone 8 的设计理念和架构，包括 Windows Phone 8 的用户界面原则、Windows Phone Store 应用的角色、Windows Phone 开发平台的架构等。同时，本章节还包括一个简单的“Hello World”项目，旨在帮助读者快速入门 Windows Phone 8 应用的开发。 Windows Phone 8 的设计理念 Windows Phone 8 的设计理念是基于用户中心的设计理念，旨在提供简洁、流畅的用户体验。Windows Phone 8 的用户界面采用了 Metro 设计语言，强调内容的显示和交互，减少了应用程序的 chrome 元素。这种设计理念使得 Windows Phone 8 的用户界面看起来非常简洁和现代化。 Windows Phone 8 的架构 Windows Phone 8 的架构基于 Windows NT 内核，提供了一个稳定、安全的开发平台。Windows Phone 8 的架构包括应用程序层、框架层、操作系统层和硬件层等几个部分。应用程序层是 Windows Phone 8 应用的入口点，框架层提供了各种开发框架和工具，操作系统层提供了操作系统的核心功能，硬件层提供了硬件资源的支持。 Windows Phone 8 的开发平台 Windows Phone 8 的开发平台提供了一个完整的开发环境，包括Visual Studio、 Expression Blend 等开发工具。开发者可以使用 C#、VB.NET、C++ 等语言开发 Windows Phone 8 应用。Windows Phone 8 的开发平台还提供了许多开发框架和库，例如 Windows Phone 8 的控件库、数据绑定库等。 WinPhone8 开发技术资料提供了一个详细的 Windows Phone 8 开发指南，涵盖了 Windows Phone 8 的设计理念、架构、开发平台和开发技术等方面，为开发者提供了一个系统的学习资源。

CHAPTER 1 Vision and Architecture 15

Windows Runtime

For consumers, the most radical change in Windows 8 is the new UI. For developers, it is the new

programming model and API set, collectively known as the Windows Runtime, or WinRT. Although

Microsoft has delivered a variety of new developer technologies on top of Windows over the years

(most notably .NET), the core Windows programming model has not changed signicantly in decades.

WinRT represents not just a set of new features and capabilities, but a fundamentally different way of

building Windows apps and components.

The WinRT platform is based on a version of the Component Object Model (COM) augmented by

detailed metadata describing each component. This metadata makes it simple for WinRT methods

and types to be “projected” into the various programming environments built on top of it. In Win-

dows Phone, there are two such environments, a CoreCLR-based version of .NET (C# or Visual Basic)

and pure native code (C/C++). We will discuss WinRT throughout the book, covering both consump-

tion of WinRT APIs from your apps as well as creation of new WinRT components.

Note Even though the core architecture of the Windows Runtime and many of the APIs

are the same for Windows and Windows Phone, the two platforms offer different ver-

sions of the API framework which sits on top of it. For instance, Windows Phone does not

implement the Windows.System.RemoteDesktop class, but does add some phone-specic

namespaces, like Windows.Phone.Networking.Voip. To avoid any confusion, the term

Windows Phone Runtime (WinPRT) is used to refer to the implementation of the Windows

Runtime and API framework on Windows Phone. We will use WinPRT throughout the re-

mainder of the book.

Building and Delivering Apps

Now that you understand the fundamentals of Windows Phone, it’s time to start looking at how you

can build and deliver apps that run on it.

Developer Tools

Everything you need to get started building Windows Phone 8 apps is available in the Windows

Phone 8 SDK, which is available as a free download from the Windows Phone Dev Center at

http://dev.windowsphone.com. In particular, the Windows Phone 8 SDK includes the following:



Microsoft Visual Studio 2012 Express for Windows Phone



Microsoft Blend 2012 Express for Windows Phone



The Windows Phone device emulator

16 WINDOWS® PHONE 8 DEVELOPMENT INTERNALS



Project templates, reference assemblies (for managed code development), and headers/

libraries (for native code development)

As with previous versions of the Windows Phone SDK, Visual Studio Express and Blend Express

can be installed on top of full versions of Visual Studio and Blend, seamlessly merging all of the

phone-specic tools and content directly into your existing tools. Throughout the book, we will

refer to Visual Studio Express 2012 for Windows Phone as the primary development environment for

Windows Phone 8, but everything we describe will work just as well with any other version of Visual

Studio once you have the Windows Phone 8 SDK installed.

Note Visual Studio 2012, including Visual Studio 2012 Express for Windows Phone, can

only be installed on Windows 8.

Windows Phone Emulator System Requirements

The Windows Phone 8 SDK includes a new version of the Windows Phone emulator for testing apps

directly on your desktop. The new emulator is built on the latest version of Microsoft Hyper-V, which

requires a 64-bit CPU that includes Second Level Address Translation (SLAT), a memory virtualization

technology included in most modern CPUs from Intel and AMD.

To check if your CPU supports SLAT, do the following:

1. Download the Coreinfo tool from http://technet.microsoft.com/en-us/sysinternals/cc835722.

2. Open a command prompt as an administrator. From the Start menu, type cmd to nd the

command prompt, right-click it, and then choose Run As Administrator.

3. Navigate to the location where you downloaded Coreinfo and run CoreInfo -v.

4. Look for a row labeled EPT (for Intel CPUs) or NP (for AMD). If you see an asterisk, as in Figure

1-7, you’re all set. If you see a dash, your CPU does not support SLAT and will not be capable

of running the new Windows Phone Emulator. Note that if you have already activated Hyper-V

on your computer, you will see an asterisk in the HYPERVISOR row and dashes elsewhere else.

In this case, you can safely ignore the dashes as your computer is already prepared to run the

Windows Phone Emulator.

18 WINDOWS® PHONE 8 DEVELOPMENT INTERNALS

App Delivery

Windows Phone 7.x offered a single broad mechanism for distributing apps: the Windows Phone

Application Store (previously, the Windows Phone Application Marketplace). In Windows Phone 8, the

Store will continue to be the primary source of apps for most customers. However, the distribution

options have been expanded to include additional channels for distributing enterprise apps—enter-

prise customers will be able to deliver apps to their employees via the Internet, intranet, email, or by

loading them on a microSD card and inserting the card into the phone. The options for app deploy-

ment in Windows Phone 8 are depicted in Figure 1-8.

Standard

Developer

Attachment

Windows

Phone

MicroSD

card

Download

Windows

Phone

DevCenter

Windows

Phone Store

FIGURE 1-8 Windows Phone 8 adds multiple enterprise deployment options.

If you’re familiar with any avor of.NET technology, you know that building a project doesn’t gener-

ally convert your code into something that’s directly executable by a CPU. Rather, it is converted into

Microsoft Intermediate Language (MSIL), a platform-independent instruction set, and packaged into

a dynamic-link library (DLL). In the case of Windows Phone, these DLLs are then added to your app

package for delivery to the phone, where it remains until the user launches the app. At that point, the

just-in-time (JIT) compiler turns those DLLs into native instructions targeting the appropriate plat-

form—ARM for physical devices and x86 for the Windows Phone emulator.

In Windows Phone 8, this process changes, such that all apps are precompiled as part of the Win-

dows Phone Store submission process. This means that when a user downloads an app from the Store,

the app package already contains code that is compiled for ARM. Because no “JITing” is required

when the app is starting up or running, users should experience faster app load times and improved

runtime performance.

Note Existing Windows Phone 7.1 apps are automatically precompiled in the Windows

Phone Store. No action is required from the owners of those apps.

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