Re: Obtaining an IOSCSIMultimediaCommandsDevice instance
Re: Obtaining an IOSCSIMultimediaCommandsDevice instance
- Subject: Re: Obtaining an IOSCSIMultimediaCommandsDevice instance
- From: Chris Sarcone <email@hidden>
- Date: Tue, 24 Jan 2006 15:48:27 -0800
Stephen --
What type of raw commands are you trying to send? Have you looked at
the list of CD ioctls OS X supports?
-- Chris
On Jan 24, 2006, at 3:46 PM, email@hidden wrote:
Hi Chris,
Thanks for the response!
You might want to start out with what you are trying to achieve. Are
you trying to send commands from kernel-level code or user-level
code?
Preferably user-level.
If the latter, you might want to check out the sample code found in /
Developer/Examples/IOKit/scsi/SCSITaskLib and consult Accessing
Hardware From Applications (http://developer.apple.com/documentation/
DeviceDrivers/Conceptual/AccessingHardware/AH_Intro/
chapter_1_section_1.html).
I've read these now (thanks for the pointer), and also consulted the
example code, but I'm still confused. The problem for me is that
this all
seems geared towards CD/DVD authoring and authoring-capable
devices. For
my application authoring doesn't matter. All I "need" to do is send a
small subset of the MMC-2 commands to the drive to access an audio
CD. I
have had some success creating an MMCDeviceInterface, but that really
doesn't help me because I can't obtain exclusive access from
SCSITaskDeviceInterface. Even if I could, I'm not sure how that would
help me because I really don't want to send raw SCSI tasks. I
still don't
understand enough about IOServiceGetMatchingServices to know which
key to
pass in to try and get an IOSCSIMultimediaCommandsDevice.
Stephen
HTH,
-- Chris
On Jan 24, 2006, at 2:30 PM, email@hidden wrote:
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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