Mac 系统API返回错误码（部分）

    @enum           Error Constants
    @abstract       The error constants unique to the HAL.
    @discussion     These are the error constants that are unique to the HAL. Note that the HAL's
                    functions can and will return other codes that are not listed here. While these
                    constants give a general idea of what might have gone wrong during the execution
                    of an API call, if an API call returns anything other than kAudioHardwareNoError
                    it is to be viewed as the same failure regardless of what constant is actually
                    returned.
    @constant       kAudioHardwareNoError
                        The function call completed successfully.
    @constant       kAudioHardwareNotRunningError
                        The function call requires that the hardware be running but it isn't.
    @constant       kAudioHardwareUnspecifiedError
                        The function call failed while doing something that doesn't provide any
                        error messages.
    @constant       kAudioHardwareUnknownPropertyError
                        The AudioObject doesn't know about the property at the given address.
    @constant       kAudioHardwareBadPropertySizeError
                        An improperly sized buffer was provided when accessing the data of a
                        property.
    @constant       kAudioHardwareIllegalOperationError
                        The requested operation couldn't be completed.
    @constant       kAudioHardwareBadObjectError
                        The AudioObjectID passed to the function doesn't map to a valid AudioObject.
    @constant       kAudioHardwareBadDeviceError
                        The AudioObjectID passed to the function doesn't map to a valid AudioDevice.
    @constant       kAudioHardwareBadStreamError
                        The AudioObjectID passed to the function doesn't map to a valid AudioStream.
    @constant       kAudioHardwareUnsupportedOperationError
                        The AudioObject doesn't support the requested operation.
    @constant       kAudioDeviceUnsupportedFormatError
                        The AudioStream doesn't support the requested format.
    @constant       kAudioDevicePermissionsError
                        The requested operation can't be completed because the process doesn't have
                        permission.
*/
CF_ENUM(OSStatus)
{
    kAudioHardwareNoError                   = 0,
    kAudioHardwareNotRunningError           = 'stop',
    kAudioHardwareUnspecifiedError          = 'what',
    kAudioHardwareUnknownPropertyError      = 'who?',   //2003332927
    kAudioHardwareBadPropertySizeError      = '!siz',
    kAudioHardwareIllegalOperationError     = 'nope',
    kAudioHardwareBadObjectError            = '!obj',   //560947818
    kAudioHardwareBadDeviceError            = '!dev', //560227702
    kAudioHardwareBadStreamError            = '!str',
    kAudioHardwareUnsupportedOperationError = 'unop',
    kAudioDeviceUnsupportedFormatError      = '!dat',
    kAudioDevicePermissionsError            = '!hog'
};