Kévin Gosse

[wpdev] Memory leak with BitmapImage

2013-02-17T14:54:28Z

There’s a memory leak that has been bothering me for a while in my Imageboard Browser app. The scenario is simple: a slideshow feature, where a new picture is loaded from an url every few seconds. After a while, the app crashes with an OutOfMemory e...

[WP8] Debugging and fixing a bug in Windows Phone sync tool

2012-12-20T20:59:56Z

Since a few days, I had this annoying bug in the application used to sync my Windows Phone with my desktop computer: every time I tried to synchronize podcasts, the application just crashed. After a while, I decided it would be a nice debugging exerci...

[WP8] Programmatically terminate a Silverlight app

2012-10-31T18:10:58Z

Exiting programmatically as always been an issue for Silverlight applications on Windows Phone 7. A few workaround existed, from throwing an exception to referencing a XNA assembly and using the ‘Game.Exit()’ method. Windows Phone 8 brings a new API,...

[WP8] Programmatically change the lock screen picture

2012-10-30T18:30:58Z

Windows Phone 8 introduces a new API to allow apps to change the background picture displayed on the lock screen. The displayed picture can be picked from the application’s resources or from the isolated storage. To use this feature, you need first t...

[WP7] Dynamically toggle PanoramaItem visibility

2012-07-01T14:35:36Z

A strange issue with the Panorama control, that has been brought to my attention by @lancewmccarthy, and which has also been encountered by some people on StackOverflow. The original scenario was a bit too complex for a blog post, but we can reproduc...

[WP7] IsolatedStorageException when opening a file played by a MediaElement

2012-05-06T15:47:23Z

Today we’ll dig a little into Windows Phone’s base class library, thanks to a question I found on stack overflow. The problem occurs with this simple code, used to load a music file from the isolated storage, and play it with a MediaElement: ...

[WP7] Dynamically change startup page

2012-02-12T17:48:00Z

Let’s say that you want to allow the user to customize the startup page of your application. You can easily change the startup page by editing the ‘NavigationPage’ attribute in the manifest file. But the manifest cannot be modified once the applicatio...

[WP7] Inject a file in a xap using post-build event

2012-01-12T13:47:09Z

Let’s say that your application is dynamically loading resources, and you have to constantly add/remove new resources during the development. In this scenario, it could be a huge-time saver to just tell Visual Studio to take the contents of a folder a...

[WP7] Cryptic error message in XAML

2012-01-09T21:12:41Z

Unexpected NONE in parse rule ElementBody ::= ATTRIBUTE* ( PropertyElement | Content )* . ENDTAG.. Best. Error message. Ever. Thanks Silverlight. So, what’s going on? For the sake of all the devs who’ll come to this page using Google, let...

[WP7] How to press the mouse on a control, and detect MouseLeftButtonUp on another

2012-01-08T10:50:35Z

Another issue I found on StackOverflow, which is way more tricky that it seems. Let’s say we have a Silverlight WP7 application, and we want to add a drag&drop scenario. The user first taps an element, drags his finger to another, and raises his ...

[WP7] ApplicationBar flickering when the phone theme is white

2012-01-05T20:55:28Z

It’s an interesting issue I found on StackOverflow. Interesting because I often forget to test my applications using the Windows Phone’s white theme, so this kind of problem usually goes unnoticed until a user reports it. Create a simple WP7 applicat...

[C#/WPF] BindingList

2011-12-19T19:48:01Z

On va s’écarter un peu de WP7 pour un article qui s’inscrit dans la lignée du “Après 8 ans de .NET, j’en découvre encore”. Au programme, un problème assez frustrant que j’ai pu rencontrer à plusieurs reprise, dans des applications WPF. Commençons pa...

[WP7] Upload a file to Dropbox using ReactiveOAuth.WP7

2011-11-13T14:14:17Z

As I was helping @lancewmccarthy on its last application, I ran across the need to upload a file to Dropbox. While there is already a few libraries for WP7 handling this task, I couldn’t get any of them to work as expected: either they missed the file...

[WP7] ScheduledActionService.Replace: Bug or documentation error?

2011-10-22T13:21:53Z

Let’s consider this simple code: 1: var beginDate = new DateTime(2011, 12, 01); 2: var endDate = new DateTime(2011, 12, 02); 3: 4: var reminder = new Reminder("Test"); 5: reminder.BeginTime...

[WP7] Pensez à gérer la désactivation des background agent !

2011-10-12T18:12:43Z

Une erreur que j’ai pu voir sur quelques applications publiées sur le marketplace. Il est possible pour l’utilisateur de désactiver manuellement un background agent créé par une application, en allant dans les paramètres du téléphone, –> applicatio...

[WP7] Windows Phone SDK 7.1 disponible

2011-09-28T18:43:05Z

Alors que le déploiement de Mango auprès du grand public a commencé hier, Microsoft vient de publier la version finale du SDK WP7.5. Pour le télécharger, il suffit de suivre ce lien : http://www.microsoft.com/download/en/details.aspx?displaylang=en&am...

[WP7] Utiliser le flash comme lampe torche

2011-09-19T19:17:36Z

Windows Phone 7 ne proposait jusque-là pas d’API permettant de contrôler l’allumage du flash, aussi toutes les applications de prétendues lampe torche se contentaient d’afficher une image blanche sur l’écran. Mango offre un plus grand contrôle sur la ...

[WP7] Windows Phone Power Tools

2011-09-13T18:56:45Z

Hier, une boite à outil fort pratique pour Windows Phone a été publiée : Windows Phone Power Tools. Cet utilitaire fourni un vaste éventail de fonctionnalités : - Affichage d’informations au sujet de votre téléphone, telles que la quantité mémoir...

[WP7] Display a settings screen from a Mango application

2011-09-11T16:36:43Z

This is one pretty sweet feature of Mango, yet it is still widely unknown. You can now display a settings page from an application. How? Simply by using the ConnectionSettingsTask class. It’s very easy to use: just set the ‘ConnectionSettingsType’ pr...

[WP7] Afficher un écran de paramètres depuis une application

2011-09-10T12:14:32Z

Une nouveauté bien sympathique du SDK Mango qui est passée relativement inaperçue. Il est désormais possible d’afficher certains écrans de réglalges depuis une application, à l’aide de la classe ConnectionSettingsTask. Son utilisation est très simple...