Hi,
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
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Usb mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
http://lists.apple.com/mailman/options/usb/email@hidden
This email sent to email@hidden
