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Porting Windows 7* Applications to Windows 8* Store Apps (PDF 443KB)
This article will guide developers in the process of porting a Windows 7 application to a Windows 8 Store app. We will discuss the design considerations, language options, and more.
One compelling reason to create and port applications to Windows 8 is that users will like them more when designed with a touch-first experience in mind. /oktava-mk-319-manual.html. Touch is arguably more natural for certain types of applications, and these applications make good candidates for being ported to Windows Store apps. Some of the types of applications that are well-suited for conversion include:
Why would you want to convert a Windows 7 desktop application to a Windows Store app?There are many potential reasons for doing this:
Let’s take a closer look at some of these compelling reasons.
The store is integrated into the Windows 8 experience. Launched directly from the Start Menu, a familiar tile-based look and feel for browsing and downloading applications quickly.
Here is some more information about using the Windows Store to sell your apps:
Touch first, less chrome, fast, fluid; these are just some of the descriptive words used to describe the Windows 8 look and feel. The interface is optimized for mobile form factors and designed to work with finger, mouse, or keyboard input giving users even more ways to interact with their PCs.
The start screen provides a new feature called Live Tiles that gives developers an interesting opportunity to get their app noticed. Live content can be displayed on the tile icon and keep the user updated as to what is new in your application at a glance.
There are even more exciting Window 8 UI features that offer developers opportunities to create compelling Windows 8 apps. Refer to these articles for more on Windows 8 UI features:
New for Windows 8 is a set of APIs called the Windows Runtime. The Windows Runtime is a unified set of APIs that can be used in .Net languages, C++, and HTML/JavaScript equally. The Windows Runtime is similar to using the .NET APIs you may be familiar with , but they have been implemented with COM inC++ to allows use from languages other than .Net. The major differences from traditional .NET APIs include the removal of many of the redundant, obsolete, and legacy APIs.
Now that you have decided to move your application to Windows 8, what is it going to take? The following sections describe some of the options and challenges in moving to Windows 8.
Adding touch support to your Windows 8 application is an important aspect of the porting process.
Let’s look at an example of what type of UI in your existing app would probably be ready for a touch-based interface and what would need some work. Here is a screen shot of a popular painting program:
Figure 1 - Main drawing page screen shot using Paint from Microsoft Windows 7*.
Highlighted in red are some of the immediately visible problem areas when thinking about how this application will work with touch.
Let’s now take a look at what a similar application looks like using the Windows 8 Store UI. This is a similar painting program in two modes. The first figure shows the main canvas drawing part of the application. The second image shows what you see when the settings menu is brought up.
Figure 2 - Main canvas screen shot using Microsoft Fresh Paint from Windows 8*
Immediately visible is how the canvas is center stage. The only visible UI besides the canvas are the undo and redo arrows. The settings UI is not immediately visible, but using touch or even a mouse will bring up the menu. A right-click or using your finger to swipe up from the bottom brings up this menu and is shown below:
Figure 3 - Settings screen shot using Microsoft Fresh Paint from Windows 8*
All the same controls are there, you can change your brush, update the color, etc., but now the interface to do this is quite a bit easier if you are using touch. Comparing just the color selection UI, you can tell the buttons are laid out farther apart making it easier to select with just a fingertip. The indicator of what color is selected is also an interesting detail and calls out the color subtly. The status bars that are persistent in the Windows 7 version are there once the settings menu is brought up so nothing is lost.
Here are a couple of great articles for learning more specifics about what makes a good touch-enabled UI:
Now that we have looked at some ideas regarding the UI and touch considerations, we can look at how to create this new great looking application.
One nice feature of developing a Windows Store app is the amount of choices available for creating this new application. Possible choices include:
Ideally, your Windows 7 application will already be written in one of these languages or at minimum one of these languages will be familiar to you.
Some of the available APIs that you might have previously used are gone, one example is GDI. There are two main ways to draw things on the screen. One option is to use DirectX and Direct2D* to do your drawing. The second option is to use XAML, which is new for C++ developers. The third option is to use both DirectX and XAML together; this is really a great option to quickly build things like settings and title menus with XAML but keep the main application drawing components as DirectX. A great example of this model is the Fresh Paint application shown in Figures 2 and 3. The menu for selecting paint brushes and colors is designed with XAML and the main canvas of the application is a Direct2D surface.
In addition to using Windows Runtime APIs from C++, some MFC APIs are still allowed but many APIs are not allowed if the app is to be a certified Windows Store app. Some obvious examples of disallowed APIs include things like message boxes, serial port APIs, DirectShow*, etc.
For more specifics on which Win32 APIs can be used in addition to alternative APIs available to Windows apps, see the following articles:
Here are some other resources to help you get started and learn the ins and outs of Windows Runtime C++ development:
The set of .Net APIs available in Windows Store app development is not the same set available when creating Windows 7 apps. Check out the following Microsoft article .NET for Windows Store apps overview for the specific details on what has changed. Obvious changes include using a folder picker class that integrates into the Windows 8 UI instead of the FolderBrowserDialog used for desktop folder browsing. The article Windows* Style app development: Using Window Runtime from C# provides some further details on the nuances of using C# from Windows 8 Runtime.
With the addition ofHTML5/JavaScript language being an option as a first-class development environment, the opportunity to move existing HTML-based web sites and apps to Windows Store apps is possible.
Much of your HTML code will be reusable when moving to a Windows Store app, but be aware of these considerations:
Here is some further reading on HTML5 and porting to an HTML Windows Store app:
Microsoft has done a great job leveraging the languages used most for Windows 7 desktop development to make the transition to Windows Store apps as easy as possible. With some thought around how to make use of Touch and Windows 8-specific features, your Windows 7 application will greatly benefit from being ported to a Window Store app.
Thanks to Ashok Emani for contributions to this article.
| Nathan Totura is an application engineer in Intel's Software and Services Group. Currently working on the Intel® Atom™ processor-enabling team, he helps connect software developers with Intel technology and resources. Primarily these technologies include tablets and handsets on the Android*, Windows 8, and Tizen* platforms. |
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