On Jan 31, 2007, at 8:14 PM, Ben Gertzfield wrote:
So, I would argue that this is not an electromechanical
implementation detail of the hardware, but perhaps an
implementation detail of the USB HID driver that talks to USB
keyboards on Mac OS X 10.4 hosts.
I tried 4 other USB keyboards I had lying around (Apple and non-
Apple), and all of them behaved identically.
Could be. I haven't designed any USB keyboards.
I also found this intriguing behavior of keyboard event taps with
the source program I sent in my initial post to this thread:
[beng@beng-macpro:~]% ./test
(I hold down the left Option key)
Got flags changed event. Old flags 0x100, new 0x80120, changed
0x80020.
(I hold down the left arrow key)
Got key down event, keycode 0x007B.
(I release the left Option key while keeping the left arrow key
held down)
Got flags changed event. Old flags 0x80120, new 0x200100, changed
0x280020.
0x200000 is NX_NUMERICPADMASK. Why am I being told Num-Lock is
being pressed in this case?
NX_NUMERICPADMASK does not mean what you think it means. It
indicates the keystrokes originate from the numeric keypad area of a
keyboard, and does not reflect the state of the Num Lock switch.
Arrow keys are considered part of the numeric keypad area.
This flag is present to allow applications to differentiate between
key characters from the main keyboard matrix and ientical characters
from the numeric keypad matrix, such as the number keys and math
symbols.
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