How to check to have microphone in QTKit

Hi All,
I try to write an application which can record my voice in Cocoa and I use QTKit framework.
Here is my code to find and open an audio input device:
BOOL succes;
NSError error;
QTCaptureDevice *audioDevice = [QTCaptureDevice defaultInputDeviceWithMediaType:QTMediaTypeSound];
success = [audioDevice open:&error];
success is always TRUE, event though I don't input any device to record (microphone). I'm using a mac mini.
So how can I check when not having a device to record?
Please help me.
Thanks.

Consider putting up an interactive recording dialog (meter, etc.) that includes a polite admonition to confirm/test microphone is 'ready' before proceeding. Even a mini could have a mac under the right circumstances...

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