hi roel, On 09.12.09 16:50, Roel van Dijk wrote: > On Wed, Dec 9, 2009 at 4:20 PM, stefan kersten <[email protected]> wrote: >> looks great, thanks! do you happen to have some example code for working with >> HID devices (mice, keyboards, etc.)? > > The usb package does not support the various device classes directly. > You won't find a function like "isKeyPressed ∷ Device → KeyCode → IO > Bool". But you could write it based solely on functions from the usb > package. Enumerate the devices connected to your system, find your HID > device, open a handle (or enter a safe region), choose an interface > and an alternative and finally send some sort of control request > encoded in a ByteString. The actual bytes you need to send in order to > discover if some key on your USB keyboard is pressed is defined > somewhere in the USB HID device class specification.
ok, thanks. i just thought you might have something ready to use ;) > If you really need that kind of functionality then you could create a > package "usb-hid" that offers an abstraction over the HID device > class. But if you just want to know if some key is pressed then a much > simpler solution would be to use a library like SDL or GLUT. i'm interested in "headless" appliances, where no window system is actually running. on linux i could use the input device layer, but it would be nice to have something more portable ... <sk> _______________________________________________ Haskell-Cafe mailing list [email protected] http://www.haskell.org/mailman/listinfo/haskell-cafe
