I am trying to communicate with a Vendor Specific USB Device which
does not have a driver built into Mac OS X. I am using code which is
basically a copy of the Apple sample code. I noticed that when I got
to the line
kernalerror = (*device)->USBDeviceOpen(device);
I got a kIOReturnExclusiveAccess error and the device would not open.
This error must mean that some other process has the device open, but
as far as I could see, I had no other processes running that would be
looking for a USB device, let alone finding and opening this one.
After much restarting and trying to run this and not run that, I
finally figured out that when a program in the Classic environment is
running I get the kIOReturnExclusiveAccess error, but if no Classic
program is running I don't get an error and I can open the device.
Not all Classic programs will cause Classic to grab the device, but
many will which should have no idea that a USB interface even exists
(Photoshop 2.5 or SimpleText for example).
Is there any way that I can get Classic to give up the device? Baring
that, is there any way to tell which Classic programs will cause this
problem so that I can warn our program users not to run those
programs at the same time?
Thanks for any wisdom you have,
Larry
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