Cannot create an URI file from text-to-speech audio on UWP

Question

I was trying to create a toast notification with text-to-speech as the audio notification. When user type a description like "Let's eat" and save the toast, when the time is come the toast will say "Let's eat". It like an ringtone for toast.

I got the answer from Social MSDN how to create an toast notification from text-to-speech, but at my program it always turn to exception.

This is the code for creating text-to-speech toast notification:

 private static async Task<Uri> AudioforToast(string text)
    {
        var voices = SpeechSynthesizer.AllVoices;
        using (var synthesizer = new SpeechSynthesizer())
        {
            if (!String.IsNullOrEmpty(text))
            {
                try
                {
                    synthesizer.Voice = voices.First(gender => gender.Gender == VoiceGender.Female);

                    // Create a stream from the text.
                    SpeechSynthesisStream synthesisStream = await synthesizer.SynthesizeTextToStreamAsync(text);

                    // And now write that to a file
                    var file = await ApplicationData.Current.TemporaryFolder.CreateFileAsync("ToastAudio", CreationCollisionOption.ReplaceExisting);
                    using (var fileStream = await file.OpenStreamForReadAsync())
                    {
                        await synthesisStream.AsStream().CopyToAsync(fileStream);
                    }

                    // And then return the file path
                    return new Uri("ms-appdata:///temp/ToastAudio");
                }

                catch (Exception)
                {
                    // If the text is unable to be synthesized, throw an error message to the user.            
                    var messageDialog = new Windows.UI.Popups.MessageDialog("Unable to synthesize text. Toast Audio is default");
                    await messageDialog.ShowAsync();
                }
            }
        }

        // If the text is unable to be synthesized, don't return a custom sound
        return null;
    }

When I tried to debug it, the code cannot save the text-to-speech result into file.

This audio later will be use as a custom audio for toast.

Answer 1

When I tried to debug it, the code cannot save the text-to-speech result into file.

I've tested your code in my side. I got the exception "the stream doesn't support write", so the question was very obvious. In your code, you just open stream for read file.OpenStreamForReadAsync() You should use file.OpenStreamForWriteAsync() Then it will work.