如何收听该房产？

Question

@constant  kAudioSessionProperty_AudioInputAvailable 
        A UInt32 with a value other than zero when audio input is available. 
        Use this property, rather than the device model, to determine if audio input is available. 
        A listener will notify you when audio input becomes available. For instance, when a headset is attached 
        to the second generation iPod Touch, audio input becomes available via the wired microphone. 

因此，如果我想获得有关kAudioSessionProperty_AudioInputAvailable的通知，我该怎么做？

Answer 1

你建立这样的监听器：

AudioSessionAddPropertyListener(kAudioSessionProperty_AudioInputAvailable, myCallback, NULL); 

你必须定义它被调用的回调函数，每当价值的变化：

void myCallback(void* inClientData, AudioSessionPropertyID inID, UInt32 inDataSize, const void* inData) 
{ 
    printf("value changed\n"); 
}