quartz composer view output: How can I get immediately the new values of outputs, if they change?

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Published on 2010-05-02T14:39:31Z Indexed on 2010/05/02 14:47 UTC
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quartz-composer

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xcode

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cocoa

Hello, I created a cocoa program with a quartz composer view. I can get the output values with:

[qcView valueForOutputKey:@"Output"]

But how can I get immediately the new values of outputs, if they change?

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