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Generating Quick Response Code in Microsoft Word CREATING TRIAL APPLICATIONS

CHAPTER 11 CREATING TRIAL APPLICATIONS
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Figure 11 1. A Free Trial button is available for the applications that support Trial mode. We will now explore in detail both the IsTrial method and the Windows Phone Marketplace API classes that are used to do this work.
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Using the IsTrial Method
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Using the IsTrial method is straightforward: this method is part of the Microsoft.Phone.Marketplace.LicenseInformation class, and it returns true if an application is being used on a trial basis (i.e., when the user clicks the Free Trial button in the Windows Phone Marketplace instead of Buy) and false if an application is running with a full license. Windows Phone Marketplace handles installation of trial and full licenses and determines when each is appropriate. However, when you execute the IsTrial method while you re developing an application, or before the application user has acquired a trial or a full application license, its behavior is unpredictable. Microsoft documentation currently says that IsTrial would return true, while our tests show the opposite. Regardless of the outcome during the development stage, we should assume that the IsTrial method will work as designed while an application is in development and make provisions for the application to execute properly when it is running under either a trial license or a full license. The short walkthrough that follows demonstrates the use of the IsTrial method and prints a message onto the screen regardless of whether the current application is running under a trial or a full license.
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CHAPTER 11 CREATING TRIAL APPLICATIONS
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First, let s create a new application and name it TrialSample. 1. Launch Visual Studio 2010 Express for Windows Phone and create a new Windows Phone Application project. Name it TrialSample.
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Now add some user interface elements. 2. From the Toolbox, drag and drop a textblock onto the application design surface. Since you are only getting familiar with the IsTrial method, leave the name of the textblock unchanged (textBlock1) and adjust its width to occupy the entire width of the screen.
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Next, let s code the demo. 3. Open MainPage.xaml.cs (right-click MainPage.xaml and select View Code), and add the following statement to the top of the page: using Microsoft.Phone.Marketplace; 4. In the MainPage() constructor, add the following code right after InitializeComponent(). LicenseInformation lic = new LicenseInformation(); if (lic.IsTrial()) { textBlock1.Text = "You are running a trial version of our software!"; } else { textBlock1.Text = "Thank you for using the full version of our software!"; } 5. Press F5 to run the application to see the results of the IsTrial method execution. When the application comes up, you should see a message stating whether you are running a trial version of your application (i.e., the IsTrial method returned true) or the full version.
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In the next section, you get to explore options that go beyond simply displaying a text message when the user is executing the trial version of our software. Namely, Windows Phone Marketplace exposes a set of classes to help the user review the details and pay for the full license of our application.
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Using the Marketplace APIs
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Now that you know how to find out whether an application is running in trial mode, let s add the ability to review an application and buy it. To do that, you'll need two new classes found in the Microsoft.Phone.Tasks namespace: MarketplaceDetailTask and MarketplaceReviewTask. These classes, known as application launchers on the Windows Phone 7 platform and described in the previous chapter ( 10), contain all the necessary functionality for your application to switch from trial to full mode. Both MarketplaceDetailTask and MarketplaceReviewTask classes implement a Show method that launches the Windows Phone Marketplace application and navigates to the specified application page. For the purposes of allowing users to switch from trial license to full license, there is little difference between these two classes. However, for reference purposes, note that MarketplaceDetailTask allows an
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