Access violation exception in system.speech.synthesis

Question

When using system.speech.synthesis like this:

using (_speech)
{
    _speech.SelectVoice("Anne");
    _speech.SpeakCompleted += OnSpeakCompleted;
    _speech.Rate = Convert.ToInt32(Rate);
    _speech.Volume = Convert.ToInt32(Volume);
    _speech.SpeakAsync(text);
}

I get this error:

System.AccessViolationException was unhandled
Message=Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
Source=System.Speech
StackTrace:
       at System.Speech.Internal.ObjectTokens.ObjectToken.ISpObjectWithToken.SetObjectToken(ISpObjectToken pToken)
       at System.Speech.Internal.ObjectTokens.ObjectToken.CreateObjectFromToken[T](String name)
       at System.Speech.Internal.Synthesis.VoiceSynthesis.GetComEngine(VoiceInfo voiceInfo)
       at System.Speech.Internal.Synthesis.VoiceSynthesis.GetProxyEngine(VoiceInfo voiceInfo)
       at System.Speech.Internal.Synthesis.VoiceSynthesis.ThreadProc()
       at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
       at System.Threading.ExecutionContext.runTryCode(Object userData)
       at System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData)
       at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart()
InnerException:

The error doesn't occur when create an object of the speech synthesiser, but happens when using it. Fx. changing the rate, volume etc.

Does anyone have a solution for this kind of problem? Solution? Hints? Anything that can help solving this annoying problem?

score 0 · Answer 1 · answered Apr 17 '13 at 10:03

0

Just a guess, you are calling _speech.SpeakAsync(text); which means you are using the speech async, in the next line you dispose the _speech object by closing the using. I can imagine that can lead to problems. You should dispose _speech object after you have the result from the processing.

answered Apr 17 '13 at 10:03

Peter

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I've just tried removing the using, but it gave me the same error – Phu Minh Pham Apr 17 '13 at 10:09

Access violation exception in system.speech.synthesis

1 Answers1