Windows® Phone 8 Unleashed

An Edge-Tracing Extras Application

This section looks at building an Extras application that converts an image to a line drawing by tracing its edges, and then allows the user to save the image to the Saved Pictures folder in the Pictures Hub. The example app for this section is located in the WPUnleashed.ExtrasExample project in the downloadable sample code.

When your app is selected from the Extras menu, your app is launched, and the main page of your app has its query string populated with a string identifier named token. The token value is then used to retrieve the image from the phone’s image library, as shown later in this section.

To hasten the pace of development and to enable testing of your app without deploying to a Windows Phone device, ...