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On 12/6/2017 4:36 PM,
sdeand...@apple.com wrote:
Hi James, IOHIDDeviceCopyValueMultiple will only with with feature/output elements. You’ll need to use IOHIDDeviceGetValue if you're querying input elements. The documentation for IOHIDDeviceCopyValueMultiple says " This method behaves synchronously and return back immediately for input type element." Doesn't that imply that it should work for input elements? Also, transactions don't seem to work for me either, and IOHIDTransactionCreate has a "direction" parameter. —scottOn Dec 1, 2017, at 5:43 PM, James Walker <jam...@frameforge3d.com> wrote: Another problem I'm having with the HID functions is that IOHIDDeviceCopyValueMultiple always returns kIOReturnError. I can use IOHIDDeviceGetValue successfully, but IOHIDDeviceCopyValueMultiple is supposed to be more efficient if you want to get a bunch of values at once. I downloaded some IOKit source code and found that the kIOReturnError error is being returned by a call to IOHIDTransactionCommit internal to IOHIDDeviceCopyValueMultiple, but that doesn't clear things up. |
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