SpeechSynthesiser : cannot stop the speak

Richard_And_Trisha

I have the following code to do the start and stop. for some reason, I cannot get it to stop

Public Property w_SpeechSynthesiser As SpeechSynthesiser

and I have two button to start and stop calling do_speech("start") and do_speech("end")

Public Async Sub do_Speech(p_type As string)
    Var speech_text As String = Await hv_Collection.ExecuteJavaScript("document.body.innerText")
    Select Case p_type
        Case "Start"
            w_SpeechSynthesiser = New SpeechSynthesiser()
            w_SpeechSynthesiser.Voice = "Daniel"
            Await w_SpeechSynthesiser.SpeakAsync(speech_text)
        Case "End"
            If w_SpeechSynthesiser <> Nothing Then w_SpeechSynthesiser.Stop()
        End Select
End Sub

rgb

Richard_And_Trisha

Hi, try this

w_SpeechSynthesiser.Voice = "Daniel"
w_SpeechSynthesiser.Speak(speech_text)

Richard_And_Trisha

rgb w_SpeechSynthesiser.Speak(speech_text)

I try like that before and it does not work either...

rgb

Richard_And_Trisha

work for me in macOS, not tested in windows

Garry

Thanks for reporting this. I reproduced a bug on macOS where Stop() cancelled speech generation but audio that had already been generated could continue playing, particularly with long passages.

The fix will be included in the next release: SpeechSynthesiser.Stop promptly stops long passages on macOS.

You can keep Await w_SpeechSynthesiser.SpeakAsync(speech_text). Awaiting speech allows other button handlers to run, including your Stop button.

I’d also suggest two changes to your code:

Move the ExecuteJavaScript call inside Case "Start". Currently, clicking Stop also waits for JavaScript execution before reaching Stop().
Reuse the synthesiser stored in your property. Creating a new instance on every Start can leave older instances speaking independently, while Stop only affects the newest one.

When you await SpeakAsync, stopping playback cancels its task, so catch TaskCancelledException to handle the user stopping speech normally.

Richard_And_Trisha

Garry I reproduced a bug on macOS where Stop() cancelled speech generation but audio that had already been generated could continue playing, particularly with long passages.

that is exactly my problem!!