01-22-2010, 01:33 PM
From the comments:
Written by: TwhK / Kheldar
What do? Installs a global keyboard hook
To install the hook, call the (gasp!) installHook() function.
installHook() takes a pointer to the function that will be called
after a keyboard event. installHook() returns True if everything
was successful, and False if it failed
Note: I've also provided a function to return a valid function pointer
To make sure the hook is actually doing what you want, call the
keepAlive() function
Note: keepAlive() doesn't return until kbHook is None, so it should
be called from a separate thread
To uninstall the hook, call uninstallHook()
Note: relies on modules provided by pywin32.
http://sourceforge.net/projects/pywin32/
KeyboardHook.py
Aforementioned function to get a function pointer:
And, a simple implementation:
Written by: TwhK / Kheldar
What do? Installs a global keyboard hook
To install the hook, call the (gasp!) installHook() function.
installHook() takes a pointer to the function that will be called
after a keyboard event. installHook() returns True if everything
was successful, and False if it failed
Note: I've also provided a function to return a valid function pointer
To make sure the hook is actually doing what you want, call the
keepAlive() function
Note: keepAlive() doesn't return until kbHook is None, so it should
be called from a separate thread
To uninstall the hook, call uninstallHook()
Note: relies on modules provided by pywin32.
http://sourceforge.net/projects/pywin32/
KeyboardHook.py
Code:
#!/usr/bin/env python
from ctypes import *
import win32con, win32api, win32gui
class KeyboardHook:
"""
Written by: TwhK / Kheldar
What do? Installs a global keyboard hook
To install the hook, call the (gasp!) installHook() function.
installHook() takes a pointer to the function that will be called
after a keyboard event. installHook() returns True if everything
was successful, and False if it failed
Note: I've also provided a function to return a valid function pointer
To make sure the hook is actually doing what you want, call the
keepAlive() function
Note: keepAlive() doesn't return until kbHook is None, so it should
be called from a separate thread
To uninstall the hook, call uninstallHook()
Note: relies on modules provided by pywin32.
http://sourceforge.net/projects/pywin32/
"""
def __init__(self):
self.user32 = windll.user32
self.kbHook = None
def installHook(self, pointer):
self.kbHook = self.user32.SetWindowsHookExA(
win32con.WH_KEYBOARD_LL,
pointer,
win32api.GetModuleHandle(None),
0 # this specifies that the hook is pertinent to all threads
)
if not self.kbHook:
return False
return True
def keepAlive(self):
if self.kbHook is None:
return
msg = win32gui.GetMessage(None, 0, 0)
while msg and self.kbHook is not None:
win32gui.TranslateMessage(byref(msg))
win32gui.DispatchMessage(byref(msg))
msg = win32gui.GetMessage(None, 0, 0)
def uninstallHook(self):
if self.kbHook is None:
return
self.user32.UnhookWindowsHookEx(self.kbHook)
self.kbHook = NoneAforementioned function to get a function pointer:
Code:
#!/usr/bin/env python
from ctypes import *
##################################################
# returns a function pointer to the fn paramater #
# assumes the function takes three params: #
# c_int, c_int, and POINTER(c_void_p) #
##################################################
def getFunctionPointer(fn):
CMPFUNC = CFUNCTYPE(c_int, c_int, c_int, POINTER(c_void_p))
return CMPFUNC(fn)And, a simple implementation:
Code:
#!/usr/bin/env python
from ctypes import *
from misc import *
from KeyboardHook import KeyboardHook
import win32con
user32 = windll.user32
#############################################
# Sample function to handle keyboard events #
#############################################
def kbEvent(nCode, wParam, lParam):
if wParam is not win32con.WM_KEYDOWN: # It just occured to me that I should aso be checking for WM_SYSKEYDOWN as well
return user32.CallNextHookEx(keyboardHook.kbHook, nCode, wParam, lParam)
print chr(lParam[0])
return user32.CallNextHookEx(keyboardHook.kbHook, nCode, wParam, lParam)
keyboardHook = KeyboardHook()
pointer = getFunctionPointer(kbEvent)
if keyboardHook.installHook(pointer):
print "installed hook"
keyboardHook.uninstallHook()
print "removed hook"
keyboardHook.keepAlive()
raw_input()