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Obtaining an IOSCSIMultimediaCommandsDevice instance



I will start by saying the IOKit is pretty much a black box for me.  I've
done only basic tasks such as creating a dictionary and calling
IOServiceGetMatchingServices for it.  Unless I've missed something, the
IOKit documentation is slightly less than stunning so I'm asking for help
here.

I want to create an IOSCSIMultimediaCommandsDevice for accessing an audio
CD using MMC-2 commands.

If I may rant for a moment, the superclass to
IOSCSIMultimediaCommandsDevice is IOSCSIPrimaryCommandsDevice defined in
"IOSCSIPrimaryCommandsDevice.h".  I don't even have that header file in my
10.4u SDK!  It's only in the 10.3.9 IOKit.  To boot, that class'
superclass is IOSCSIProtocolInterface which also appears only to exist in
my 10.3.9 SDK.

Anyway, IOSCSIMultimediaCommandsDevice is a subclass of IOService.  Can
anyone step me through how I would go about obtaining an instance of this
class?

Thanks!
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