/// <summary>
/// Processes the word queue one by one
/// the BGWorker Main loop
/// </summary>
private void SpeechWorker_DoWork(object sender, DoWorkEventArgs e)
{
bool doWork = !this.CancellationPending;
string word = "";
// Loop
while (true)
{
if (_workerWaitHandle.WaitOne(c_timeout))
{
// signalled
lock ( _words ) {
if (_words.Count > 0)
{
word = _words.Dequeue( );
}
}
#pragma warning disable CS4014 // Because this call is not awaited, execution of the current method continues before the call is completed
_speakerWaitHandle.Reset( );
_speaker.SpeakAsync(word);
#pragma warning restore CS4014 // Because this call is not awaited, execution of the current method continues before the call is completed
// wait until spoken
if (_speakerWaitHandle.WaitOne(s_timeout))
{
// report a word said
this.ReportProgress(++progressCount);
}
else
{
// run into a speech time out - either the word was tool long or something else prevented
// the Speaker to signal end of speech
// anyway try to recover and continue
_speaker.Reset( );
}
}
// check for cancellation requested
doWork &= (!this.CancellationPending);
if (!doWork)
{
break;
}
// retrigger of there are words left
if (_words.Count > 0)
{
_workerWaitHandle.Set( );
}
}
// finishing here
_words.Clear( );
_workerWaitHandle.Reset( );
_speakerWaitHandle.Reset( );
_speaker?.Dispose( );
_speaker = null;
// requires a new Init to proceed with Speaking
}
/// <summary>
/// cTor:
/// </summary>
public SpeechWorker( )
{
_workerWaitHandle = new AutoResetEvent(false);
_speakerWaitHandle = new AutoResetEvent(false);
_speaker = new VoiceSynth(_speakerWaitHandle);
this.WorkerSupportsCancellation = true;
this.WorkerReportsProgress = true;
this.DoWork += SpeechWorker_DoWork;
}
/// <summary>
/// Start the Speaker processing
/// </summary>
/// <param name="parameter">A parameter obj to use</param>
public void InitSpeaker(object parameter)
{
if (!this.IsBusy)
{
// restart
_speaker?.Dispose( );
_workerWaitHandle.Dispose( );
_speakerWaitHandle.Dispose( );
_workerWaitHandle = new AutoResetEvent(false);
_speakerWaitHandle = new AutoResetEvent(false);
_speaker = new VoiceSynth(_speakerWaitHandle);
ClearWords( );
progressCount = 0;
this.RunWorkerAsync(parameter);
}
else
{
throw new InvalidOperationException("Cannot InitSpeaker while Busy. Must Cancel first!");
}
}
