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Cocoa KVC and Structure Value Access

I'm designing the interface to my latest app and I've decided to use Quartz Composer instead of Core Animation simply for the ease of development.

The stumbling block I've hit is getting my objects and their data into my composition. I've published a generic structure "Controller" input port an a boolean "Debug" one. I am setting them using -

[compositionController setValue:[NSNumber numberWithBool:NO] forKeyPath:@"patch.Debug_1.value"];
[compositionController setValue:self forKeyPath:@"patch.Controller.value"];

This works so far and I've verified the value is actually set by pulling it back out using valueForKey:

I'm then attempting to extract the various values I need using Structure Key Member patches with no avail. I've searched the archives and found this: http://lists.apple.com/archives/quartzcomposer-dev/2006/Nov/msg00095.html

For QC not to use KVC I think is a major oversight, and presents an entry to the Cocoa frameworks.

The only solution I can think of is to write a QCPlugin subclass that does use KVC to get the value required, but in writing that I can't set my input/output properties as virtual.

Can anyone help me get around this problem without having to redesign my whole UI in Core Animation?

Thanks,
Keith
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