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Tutorial

Listing accessible event devices

>>> from evdev import InputDevice, list_devices

>>> devices = map(InputDevice, list_devices())

>>> for dev in devices:
...    print( '%-20s %-32s %s' % (dev.fn, dev.name, dev.phys) )
/dev/input/event1    Dell Dell USB Keyboard   usb-0000:00:12.1-2/input0
/dev/input/event0    Dell USB Optical Mouse   usb-0000:00:12.0-2/input0

Listing device capabilities

>>> dev = InputDevice('/dev/input/event0')

>>> print(dev)
device /dev/input/event0, name "Dell USB Optical Mouse", phys "usb-0000:00:12.0-2/input0"

>>> dev.capabilities()
... { 0: [0, 1, 2], 1: [272, 273, 274, 275], 2: [0, 1, 6, 8], 4: [4] }

>>> dev.capabilities(verbose=True)
... { ('EV_SYN', 0): [('SYN_REPORT', 0), ('SYN_CONFIG', 1), ('SYN_MT_REPORT', 2)],
...   ('EV_KEY', 1): [('BTN_MOUSE', 272), ('BTN_RIGHT', 273), ('BTN_MIDDLE', 274), ('BTN_SIDE', 275)], ...

Listing device capabilities for devices with absolute axes

>>> dev = InputDevice('/dev/input/event7')

>>> print(dev)
device /dev/input/event7, name "Wacom Bamboo 2FG 4x5 Finger", phys ""

>>> dev.capabilities()
... { 1: [272, 273, 277, 278, 325, 330, 333] ,
...   3: [(0, AbsInfo(min=0, max=15360, fuzz=128, flat=0)),
...       (1, AbsInfo(min=0, max=10240, fuzz=128, flat=0))] }

>>> dev.capabilities(verbose=True)
... { ('EV_KEY', 1): [('BTN_MOUSE', 272), ('BTN_RIGHT', 273), ...],
...   ('EV_ABS', 3): [(('ABS_X', 0), AbsInfo(min=0, max=15360, fuzz=128, flat=0)),
...                   (('ABS_Y', 1), AbsInfo(min=0, max=10240, fuzz=128, flat=0)),] }

>>> dev.capabilities(absinfo=False)
... { 1: [272, 273, 277, 278, 325, 330, 333],
...   3: [0, 1, 47, 53, 54, 57] }

Getting and setting LED states

>>> dev.leds(verbose=True)
... [('LED_NUML', 0), ('LED_CAPSL', 1)]

>>> dev.leds()
... [0, 1]

>>> dev.set_led(ecodes.LED_NUML, 1)  # enable numlock
>>> dev.set_led(ecodes.LED_NUML, 0)  # disable numlock

Accessing input subsystem constants

>>> from evdev import ecodes
>>> ecodes.KEY_A, ecodes.ecodes['KEY_A']
... (30, 30)
>>> ecodes.KEY[30]
... 'KEY_A'
>>> ecodes.bytype[ecodes.EV_KEY][30]
... 'KEY_A'
# a single value in the reverse mappings may correspond to multiple codes
>>> ecodes.KEY[152]
... ['KEY_COFFEE', 'KEY_SCREENLOCK']

Reading events

>>> from evdev import InputDevice, categorize, ecodes
>>> dev = InputDevice('/dev/input/event1')

>>> print(dev)
device /dev/input/event1, name "Dell Dell USB Keyboard", phys "usb-0000:00:12.1-2/input0"

>>> for event in dev.read_loop():
...     if event.type == ecodes.EV_KEY:
...         print(categorize(event))
... # pressing 'a' and holding 'space'
key event at 1337016188.396030, 30 (KEY_A), down
key event at 1337016188.492033, 30 (KEY_A), up
key event at 1337016189.772129, 57 (KEY_SPACE), down
key event at 1337016190.275396, 57 (KEY_SPACE), hold
key event at 1337016190.284160, 57 (KEY_SPACE), up

Reading events from multiple devices

>>> from evdev import InputDevice
>>> from select import select

>>> devices = map(InputDevice, ('/dev/input/event1', '/dev/input/event2'))
>>> devices = {dev.fd : dev for dev in devices}

>>> for dev in devices.values(): print(dev)
device /dev/input/event1, name "Dell Dell USB Keyboard", phys "usb-0000:00:12.1-2/input0"
device /dev/input/event2, name "Logitech USB Laser Mouse", phys "usb-0000:00:12.0-2/input0"

>>> while True:
...    r,w,x = select(devices, [], [])
...    for fd in r:
...        for event in devices[fd].read():
...            print(event)
event at 1351116708.002230, code 01, type 02, val 01
event at 1351116708.002234, code 00, type 00, val 00
event at 1351116708.782231, code 04, type 04, val 458782
event at 1351116708.782237, code 02, type 01, val 01

Reading events with asyncore

>>> from asyncore import file_dispatcher, loop
>>> from evdev import InputDevice, categorize, ecodes
>>> dev = InputDevice('/dev/input/event1')

>>> class InputDeviceDispatcher(file_dispatcher):
...     def __init__(self, device):
...         self.device = device
...         file_dispatcher.__init__(self, device)
...
...     def recv(self, ign=None):
...         return self.device.read()
...
...     def handle_read(self):
...         for event in self.recv():
...             print(repr(event))

>>> InputDeviceDispatcher(dev)
>>> loop()
InputEvent(1337255905L, 358854L, 1, 30, 0L)
InputEvent(1337255905L, 358857L, 0, 0, 0L)

Getting exclusive access to a device

>>> dev.grab()  # become the sole recipient of all incoming input events
>>> dev.ungrab()

Associating classes with event types

>>> from evdev import categorize, event_factory, ecodes

>>> class SynEvent(object):
...     def __init__(self, event):
...         ...

>>> event_factory[ecodes.EV_SYN] = SynEvent

See :mod:`events <evdev.events.event_factory>` for more information.

Injecting events

>>> from evdev import UInput, ecodes as e

>>> ui = UInput()

>>> # accepts only KEY_* events by default
>>> ui.write(e.EV_KEY, e.KEY_A, 1)  # KEY_A down
>>> ui.write(e.EV_KEY, e.KEY_A, 0)  # KEY_A up
>>> ui.syn()

>>> ui.close()

Injecting events (2)

>>> ev = InputEvent(1334414993, 274296, ecodes.EV_KEY, ecodes.KEY_A, 1)
>>> with UInput() as ui:
...    ui.write_event(ev)
...    ui.syn()

Specifying uinput device options

>>> from evdev import UInput, AbsInfo, ecodes as e

>>> cap = {
...     e.EV_KEY : [e.KEY_A, e.KEY_B],
...     e.EV_ABS : [
...         (e.ABS_X, AbsInfo(min=0, max=255, fuzz=0, flat=0)),
...         (e.ABS_Y, AbsInfo(0, 255, 0, 0)),
...         (e.ABS_MT_POSITION_X, (0, 255, 128, 0)) ]
... }

>>> ui = UInput(cap, name='example-device', version=0x3)
>>> print(ui)
name "example-device", bus "BUS_USB", vendor "0001", product "0001", version "0003"
event types: EV_KEY EV_ABS EV_SYN

>>> print(ui.capabilities())
... { 0: [0, 1, 3], 1: [30, 48],
...   3: [(0,  AbsInfo(min=0, max=255, fuzz=0, flat=0)),
...       (1,  AbsInfo(min=0, max=255, fuzz=0, flat=0)),
...       (53, AbsInfo(min=0, max=255, fuzz=128, flat=0))] }

>>> # move mouse cursor
>>> ui.write(e.EV_ABS, e.ABS_X, 20)
>>> ui.write(e.EV_ABS, e.ABS_Y, 20)
>>> ui.syn()
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