Cortana call causes crash on startup

Question

I have a Windows Phone 8.1 Universal App in which I am working on adding basic Cortana support. Many articles about this for Silverlight, etc. “It's hard for me to find really good information about this.”

So far, I have activated the work if the application is already running or paused. However, if the application completely exited, then upon activation it will immediately work. I tried using hockey and the simple “LittleWatson” procedure to catch a crash, but it seems like it's too early to be caught. I saw some links to a private beta and trying to get a dump of crashes, but so far I have been unlucky.

Here my activation code looks like app.xaml.cs :

  protected override void OnActivated(IActivatedEventArgs args) { base.OnActivated(args); ReceivedSpeechRecognitionResult = null; if (args.Kind == ActivationKind.VoiceCommand) { var commandArgs = args as VoiceCommandActivatedEventArgs; if (commandArgs != null) { ReceivedSpeechRecognitionResult = commandArgs.Result; var rootFrame = Window.Current.Content as Frame; if (rootFrame != null) { rootFrame.Navigate(typeof(CheckCredentials), null); } } } } 

and here is my check for the result of the command:

  private async Task CheckForVoiceCommands() { await Task.Delay(1); // not sure why I need this var speechRecognitionResult = ((App)Application.Current).ReceivedSpeechRecognitionResult; if (speechRecognitionResult == null) { return; } var voiceCommandName = speechRecognitionResult.RulePath[0]; switch (voiceCommandName) { // omitted } ((App)Application.Current).ReceivedSpeechRecognitionResult = null; } 

I am sure that I am inserting messages, etc., that he fails long before he gets to this.

Most likely something light, but I don’t know what ...

What causes a disaster so early?

EDIT . One thing I tried is to use the "debug without launch" configuration to try to catch the exception. When I do this, the application seems to forever and forever connect in the debugger on the splash screen. However, this allowed me to take a break. He hangs in

 global::Windows.UI.Xaml.Application.Start((p) => new App()); 

which, as far as I can tell, just tells me that the application is hanging somewhere. This is the only line in the call stack.

Answer 1

Copy the OnLaunched code segment into OnActivated, as in the example below. OnLaunched is not called when the application is activated, and it does some important work, such as activating a window.

 protected override void OnActivated(IActivatedEventArgs args) { // When a Voice Command activates the app, this method is going to // be called and OnLaunched is not. Because of that we need similar // code to the code we have in OnLaunched Frame rootFrame = Window.Current.Content as Frame; if (rootFrame == null) { rootFrame = new Frame(); rootFrame.CacheSize = 1; Window.Current.Content = rootFrame; rootFrame.Navigate(typeof(MainPage)); } Window.Current.Activate(); // For VoiceCommand activations, the activation Kind is ActivationKind.VoiceCommand if(args.Kind == ActivationKind.VoiceCommand) { // since we know this is the kind, a cast will work fine VoiceCommandActivatedEventArgs vcArgs = (VoiceCommandActivatedEventArgs)args; // The NavigationTarget retrieved here is the value of the Target attribute in the // Voice Command Definition xml Navigate node string target = vcArgs.Result.SemanticInterpretation.Properties["NavigationTarget"][0];