I'm trying to record microphone input by using Windows waveIn series APIs, the demo wroks fine all the way except when stopping record, I called waveInReset to flush remain PCM data which will trigger CALLBACK function, I write final data and call waveInUnperpareHeader to unprepare the buffer, but the program hang there, the waveInUnperpareHeader never return. What's wrong? Thanks in advance.

Thanks, I just messed by the system dead lock...