StartPlayback on callback thread fails in .NET

The information in this article applies to:

• SpeechKit 4

Symptoms

Results are unpredictable when invoking TTS or SR requests in HasEvent handlers in .NET .

Cause

Application callbacks are considered static unless they are via windows message (SetWindowMessage). They are performed synchronously on the speech event callback thread.

Status

All callbacks are now fired asynchronously. In .NET, events are now dispatched to the application on separate threads like the Java component. In .NET, you must change your NChantSR and NChantTTS instantiation to include reference to the owner (parent) object to be able to access parent-owned objects and invoke NChantSR and NChantTTS methods:

	NChantSR1 = new NChantSR(this);
	self.NChantSR1 := SpeechKit.NChantSR.Create(self);  // Delphi .NET

	NChantTTS1 = new NChantSR(this);
	self.NChantTTS1 := SpeechKit.NChantTTS.Create(self);  // Delphi .NET

Fixed in SpeechKit 4 build 4.0.124.0.

Component Formats Impacted

All component formats.