On Jan 28, 2008, at 7:00 PM, William Stewart wrote:
On Jan 26, 2008, at 1:45 AM, Eric Gorouben wrote:
Hi, there
1) I've seen in a previous thread that property changes should not
be notified through AUEventListenerNotify. I need to issu a
property changed notification from my AUCarbonViewBase to my AU.
No you don't.
If the property is changing, then your AU should be initiating the
property change, not your AU.
I mean not your view :)
This works fine in Tiger:
void CGui::myNotify(){
AudioUnitEvent myEvent;
myEvent.mEventType = kAudioUnitEvent_PropertyChange;
myEvent.mArgument.mProperty.mAudioUnit = GetEditAudioUnit ();
myEvent.mArgument.mProperty.mPropertyID =
kAudioUnitProperty_MyProperty;
myEvent.mArgument.mProperty.mScope = kAudioUnitScope_Global;
myEvent.mArgument.mProperty.mElement = 0;
OSStatus err=AUEventListenerNotify(NULL,NULL,&myEvent);
fprintf(stderr,"myNotify err=%d\n",err);
}
But result, of course, is -50 in Leopard
Bill Stewart:
We normally don't expect the ListenerNotify to be called from
property changes, so that could be why you are seeing a
discrepancy here
and
You shouldn't need to make this call from within an AU - all you
need to do there is call the AUBase::PropertyChanged method (which
in turn will turn around and call of the registered property
change listeners iwth the AU).
But, from my AUCarbonViewBase, I can't call PropertyChanged.
What is the way to send a property changed notification from the
view to the AU?
In your AU, you call the PropertyChanged method
I try to follow Cynthia Maxwell's advice:
All you are looking to do is send a notification to your AU from
your view to call AUMonotimbralInstrumentBase ::RealTimeStartNote,
which then tells your note to Render.
You can do that via a property changed notification and pass along
a stuct with the key and velocity info.
hmm... so if I understand it, you want to notify your view that a
note just started?
So, in the RealTimeStartNote implementation in your AU, you make the
AUBase::PropertyChanged call. Your view will then receive a
notification that the property it is interested in has changed, and
it can go and get the new value(s)
Does that make sense?
Bill
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