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_win32.py
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_win32.py
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# coding=utf-8
# pynput
# Copyright (C) 2015-2017 Moses Palmér
#
# This program is free software: you can redistribute it and/or modify it under
# the terms of the GNU Lesser General Public License as published by the Free
# Software Foundation, either version 3 of the License, or (at your option) any
# later version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
"""
The keyboard implementation for *Windows*.
"""
# pylint: disable=C0111
# The documentation is extracted from the base classes
# pylint: disable=R0903
# We implement stubs
import contextlib
import ctypes
import enum
import six
from ctypes import wintypes
import pynput._util.win32_vks as VK
from pynput._util import AbstractListener, NotifierMixin
from pynput._util.win32 import (
INPUT,
INPUT_union,
KEYBDINPUT,
KeyTranslator,
ListenerMixin,
SendInput,
SystemHook,
VkKeyScan)
from . import _base
class KeyCode(_base.KeyCode):
def _parameters(self, is_press):
"""The parameters to pass to ``SendInput`` to generate this key.
:param bool is_press: Whether to generate a press event.
:return: all arguments to pass to ``SendInput`` for this key
:rtype: dict
"""
if self.vk:
vk = self.vk
scan = 0
flags = 0
else:
res = VkKeyScan(self.char)
if (res >> 8) & 0xFF == 0:
vk = res & 0xFF
scan = 0
flags = 0
else:
vk = 0
scan = ord(self.char)
flags = KEYBDINPUT.UNICODE
return dict(
dwFlags=flags | (KEYBDINPUT.KEYUP if not is_press else 0),
wVk=vk,
wScan=scan)
class Key(enum.Enum):
alt = KeyCode.from_vk(VK.MENU)
alt_l = KeyCode.from_vk(VK.LMENU)
alt_r = KeyCode.from_vk(VK.RMENU)
alt_gr = KeyCode.from_vk(VK.RMENU)
backspace = KeyCode.from_vk(VK.BACK)
caps_lock = KeyCode.from_vk(VK.CAPITAL)
cmd = KeyCode.from_vk(VK.LWIN)
cmd_l = KeyCode.from_vk(VK.LWIN)
cmd_r = KeyCode.from_vk(VK.RWIN)
ctrl = KeyCode.from_vk(VK.CONTROL)
ctrl_l = KeyCode.from_vk(VK.LCONTROL)
ctrl_r = KeyCode.from_vk(VK.RCONTROL)
delete = KeyCode.from_vk(VK.DELETE)
down = KeyCode.from_vk(VK.DOWN)
end = KeyCode.from_vk(VK.END)
enter = KeyCode.from_vk(VK.RETURN)
esc = KeyCode.from_vk(VK.ESCAPE)
f1 = KeyCode.from_vk(VK.F1)
f2 = KeyCode.from_vk(VK.F2)
f3 = KeyCode.from_vk(VK.F3)
f4 = KeyCode.from_vk(VK.F4)
f5 = KeyCode.from_vk(VK.F5)
f6 = KeyCode.from_vk(VK.F6)
f7 = KeyCode.from_vk(VK.F7)
f8 = KeyCode.from_vk(VK.F8)
f9 = KeyCode.from_vk(VK.F9)
f10 = KeyCode.from_vk(VK.F10)
f11 = KeyCode.from_vk(VK.F11)
f12 = KeyCode.from_vk(VK.F12)
f13 = KeyCode.from_vk(VK.F13)
f14 = KeyCode.from_vk(VK.F14)
f15 = KeyCode.from_vk(VK.F15)
f16 = KeyCode.from_vk(VK.F16)
f17 = KeyCode.from_vk(VK.F17)
f18 = KeyCode.from_vk(VK.F18)
f19 = KeyCode.from_vk(VK.F19)
f20 = KeyCode.from_vk(VK.F20)
home = KeyCode.from_vk(VK.HOME)
left = KeyCode.from_vk(VK.LEFT)
page_down = KeyCode.from_vk(VK.NEXT)
page_up = KeyCode.from_vk(VK.PRIOR)
right = KeyCode.from_vk(VK.RIGHT)
shift = KeyCode.from_vk(VK.LSHIFT)
shift_l = KeyCode.from_vk(VK.LSHIFT)
shift_r = KeyCode.from_vk(VK.RSHIFT)
space = KeyCode.from_vk(VK.SPACE, char=' ')
tab = KeyCode.from_vk(VK.TAB)
up = KeyCode.from_vk(VK.UP)
insert = KeyCode.from_vk(VK.INSERT)
menu = KeyCode.from_vk(VK.APPS)
num_lock = KeyCode.from_vk(VK.NUMLOCK)
pause = KeyCode.from_vk(VK.PAUSE)
print_screen = KeyCode.from_vk(VK.SNAPSHOT)
scroll_lock = KeyCode.from_vk(VK.SCROLL)
class Controller(_base.Controller):
_KeyCode = KeyCode
_Key = Key
def _handle(self, key, is_press):
SendInput(
1,
ctypes.byref(INPUT(
type=INPUT.KEYBOARD,
value=INPUT_union(
ki=KEYBDINPUT(**key._parameters(is_press))))),
ctypes.sizeof(INPUT))
class Listener(ListenerMixin, _base.Listener):
#: The Windows hook ID for low level keyboard events, ``WH_KEYBOARD_LL``
_EVENTS = 13
_WM_KEYDOWN = 0x0100
_WM_KEYUP = 0x0101
_WM_SYSKEYDOWN = 0x0104
_WM_SYSKEYUP = 0x0105
# A bit flag attached to messages indicating that the payload is an actual
# UTF-16 character code
_UTF16_FLAG = 0x1000
# A special virtual key code designating unicode characters
_VK_PACKET = 0xE7
#: The messages that correspond to a key press
_PRESS_MESSAGES = (_WM_KEYDOWN, _WM_SYSKEYDOWN)
#: The messages that correspond to a key release
_RELEASE_MESSAGES = (_WM_KEYUP, _WM_SYSKEYUP)
#: A mapping from keysym to special key
_SPECIAL_KEYS = {
key.value.vk: key
for key in Key}
_HANDLED_EXCEPTIONS = (
SystemHook.SuppressException,)
class _KBDLLHOOKSTRUCT(ctypes.Structure):
"""Contains information about a mouse event passed to a
``WH_KEYBOARD_LL`` hook procedure, ``LowLevelKeyboardProc``.
"""
_fields_ = [
('vkCode', wintypes.DWORD),
('scanCode', wintypes.DWORD),
('flags', wintypes.DWORD),
('time', wintypes.DWORD),
('dwExtraInfo', ctypes.c_void_p)]
#: A pointer to a :class:`KBDLLHOOKSTRUCT`
_LPKBDLLHOOKSTRUCT = ctypes.POINTER(_KBDLLHOOKSTRUCT)
def __init__(self, *args, **kwargs):
super(Listener, self).__init__(*args, **kwargs)
self._translator = KeyTranslator()
self._event_filter = self._options.get(
'event_filter',
lambda msg, data: True)
def _convert(self, code, msg, lpdata):
if code != SystemHook.HC_ACTION:
return
data = ctypes.cast(lpdata, self._LPKBDLLHOOKSTRUCT).contents
is_packet = data.vkCode == self._VK_PACKET
# Suppress further propagation of the event if it is filtered
if self._event_filter(msg, data) is False:
return None
elif is_packet:
return (msg | self._UTF16_FLAG, data.scanCode)
else:
return (msg, data.vkCode)
@AbstractListener._emitter
def _process(self, wparam, lparam):
msg = wparam
vk = lparam
# If the key has the UTF-16 flag, we treat it as a unicode character,
# otherwise convert the event to a KeyCode; this may fail, and in that
# case we pass None
is_utf16 = msg & self._UTF16_FLAG
if is_utf16:
msg = msg ^ self._UTF16_FLAG
scan = vk
key = KeyCode.from_char(six.unichr(scan))
else:
try:
key = self._event_to_key(msg, vk)
except OSError:
key = None
if msg in self._PRESS_MESSAGES:
self.on_press(key)
elif msg in self._RELEASE_MESSAGES:
self.on_release(key)
# pylint: disable=R0201
@contextlib.contextmanager
def _receive(self):
"""An empty context manager; we do not need to fake keyboard events.
"""
yield
# pylint: enable=R0201
def _event_to_key(self, msg, vk):
"""Converts an :class:`_KBDLLHOOKSTRUCT` to a :class:`KeyCode`.
:param msg: The message received.
:param vk: The virtual key code to convert.
:return: a :class:`pynput.keyboard.KeyCode`
:raises OSError: if the message and data could not be converted
"""
# We must always call self._translate to keep the keyboard state up to
# date
key = KeyCode(**self._translate(
vk,
msg in self._PRESS_MESSAGES))
# If the virtual key code corresponds to a Key value, we prefer that
if vk in self._SPECIAL_KEYS:
return self._SPECIAL_KEYS[vk]
else:
return key
def _translate(self, vk, is_press):
"""Translates a virtual key code to a parameter list passable to
:class:`pynput.keyboard.KeyCode`.
:param int vk: The virtual key code.
:param bool is_press: Whether this is a press event.
:return: a paramter list to the :class:`pynput.keyboard.KeyCode`
constructor
"""
return self._translator(vk, is_press)