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Re: Can I write a user client for a USB driver



G'day Wayne,

I believe that if the extension is NOT on kext stat that it ISN'T loaded in the system. Does your driver turn up in the ioreg? Try 'ioreg -sc <yourclassname>' This produces a lot of pages of output but also a property list that is based on your successfully matched personality.

If your driver doesn't turn up in either ioreg or kextstat then you are NOT loaded.

Godfrey

On 06/03/2005, at 13:44 , Wayne Hasley wrote:

Godfrey van der Linden <email@hidden> wrote:

If kextstat can't find your driver then you are not loaded and then it is hard to rendezvous with your driver.
How do you usually load your driver?



Godfrey,

I'm using apple sample code from
<http://developer.apple.com/samplecode/SampleUSBAudioPlugin/ SampleUSBAudioPlugin.html>
as a base for my project.


This is code for a USB device. I'm still looking in the documentation trying to find if its loaded when the system detects the USB device. (I'm assuming that the system loads my driver at boot time.)

The sample code implements a lowpass filter with a 400 Hz cutoff on streamed audio.

I can hear when the filter is active, but it's not showing up in the kextstat list.


I build it and use:
sudo cp -rf SampleUSBAudioPlugin.kext /System/Library/Extensions
sudo chown -R root:wheel /System/Library/Extensions/ SampleUSBAudioPlugin.kext/
sudo touch /System/Library/Extensions
and reboot.


After I noticed that my driver isn't showing up in the kextstat list, I noticed that it's not showing up in the original apple supplied sample code either.

The sample code driver isn't showing up, but I can "hear" when its running

Thanks in advance,
Wayne




On Friday, June 03, 2005, at 12:48PM, Godfrey van der Linden <email@hidden> wrote:




<<Original Attached>>


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References: 
 >Can I write a (From: Wayne Hasley <email@hidden>)
 >Re: Can I write a (From: Godfrey van der Linden <email@hidden>)
 >Re: Can I write a user client for a USB driver (From: Wayne Hasley <email@hidden>)



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