internal static SpeechEvent TryCreateSpeechEvent(ISpEventSource sapiEventSource, bool additionalSapiFeatures, SpeechAudioFormatInfo audioFormat)
{
SpeechEvent result = null;
uint pulFetched;
if (additionalSapiFeatures)
{
SPEVENTEX pEventArray;
((ISpEventSource2)sapiEventSource).GetEventsEx(1u, out pEventArray, out pulFetched);
if (pulFetched == 1)
{
result = new SpeechEvent(pEventArray);
}
}
else
{
SPEVENT pEventArray2;
sapiEventSource.GetEvents(1u, out pEventArray2, out pulFetched);
if (pulFetched == 1)
{
result = new SpeechEvent(pEventArray2, audioFormat);
}
}
return(result);
}
// This tries to get an event from the ISpEventSource.
// If there are no events queued then null is returned.
// Otherwise a new SpeechEvent is created and returned.
internal static SpeechEvent TryCreateSpeechEvent(ISpEventSource sapiEventSource, bool additionalSapiFeatures, SpeechAudioFormatInfo audioFormat)
{
uint fetched;
SpeechEvent speechEvent = null;
if (additionalSapiFeatures)
{
SPEVENTEX sapiEventEx;
((ISpEventSource2)sapiEventSource).GetEventsEx(1, out sapiEventEx, out fetched);
if (fetched == 1)
{
speechEvent = new SpeechEvent(sapiEventEx);
}
}
else
{
SPEVENT sapiEvent;
sapiEventSource.GetEvents(1, out sapiEvent, out fetched);
if (fetched == 1)
{
speechEvent = new SpeechEvent(sapiEvent, audioFormat);
}
}
return(speechEvent);
}
internal EventNotify(ISpEventSource sapiEventSource, IAsyncDispatch dispatcher, bool additionalSapiFeatures)
{
_sapiEventSourceReference = new WeakReference(sapiEventSource);
_dispatcher = dispatcher;
_additionalSapiFeatures = additionalSapiFeatures;
_notifySink = new SpNotifySink(this);
sapiEventSource.SetNotifySink(_notifySink);
}
internal EventNotify(ISpEventSource sapiEventSource, IAsyncDispatch dispatcher, bool additionalSapiFeatures)
{
// Remember event source
_sapiEventSourceReference = new WeakReference(sapiEventSource);
_dispatcher = dispatcher;
_additionalSapiFeatures = additionalSapiFeatures;
// Start listening to events from sapiEventSource.
_notifySink = new SpNotifySink(this);
sapiEventSource.SetNotifySink(_notifySink);
}
internal void Dispose()
{
lock (this)
{
if (_sapiEventSourceReference != null)
{
ISpEventSource spEventSource = (ISpEventSource)_sapiEventSourceReference.Target;
if (spEventSource != null)
{
spEventSource.SetNotifySink(null);
_notifySink = null;
}
}
_sapiEventSourceReference = null;
}
}
// Finalizer is not required since ISpEventSource and AsyncOperation both implement appropriate finalizers.
internal void Dispose()
{
lock (this)
{
// Since we are explicitly calling Dispose(), sapiEventSource (RCW) will normally be alive.
// If Dispose() is called from a finalizer this may not be the case so check for null.
if (_sapiEventSourceReference != null)
{
ISpEventSource sapiEventSource = (ISpEventSource)_sapiEventSourceReference.Target;
if (sapiEventSource != null)
{
// Stop listening to events from sapiEventSource.
sapiEventSource.SetNotifySink(null);
_notifySink = null;
}
}
_sapiEventSourceReference = null;
}
}
internal void SendNotification(object ignored)
{
lock (this)
{
if (_sapiEventSourceReference != null)
{
ISpEventSource spEventSource = (ISpEventSource)_sapiEventSourceReference.Target;
if (spEventSource != null)
{
List <SpeechEvent> list = new List <SpeechEvent>();
SpeechEvent item;
while ((item = SpeechEvent.TryCreateSpeechEvent(spEventSource, _additionalSapiFeatures, _audioFormat)) != null)
{
list.Add(item);
}
_dispatcher.Post(list.ToArray());
}
}
}
}
internal void SendNotification(object ignored)
{
lock (this)
{
// Call dispatchEventDelegate for each SAPI event currently queued.
if (_sapiEventSourceReference != null)
{
ISpEventSource sapiEventSource = (ISpEventSource)_sapiEventSourceReference.Target;
if (sapiEventSource != null)
{
List <SpeechEvent> speechEvents = new();
SpeechEvent speechEvent;
while (null != (speechEvent = SpeechEvent.TryCreateSpeechEvent(sapiEventSource, _additionalSapiFeatures, _audioFormat)))
{
speechEvents.Add(speechEvent);
}
_dispatcher.Post(speechEvents.ToArray());
}
}
}
}