Hey guys. I am trying to connect to windows and use Python to record keystrokes. For this, I use the LowLevelKeyboard callback procedure.
def run():
global KeyBdHook
global messages
KeyBdHook = HHook()
messages = []
start = time.time()
while time.time() < (start + 2):
KeyBdHook.hook = SetWindowsHookEx(13, KeyboardProc,
GetModuleHandle(0), 0)
if KeyBdHook.hook == 0:
print 'ERROR: '+str(ctypes.windll.kernel32.GetLastError())
UnhookWindowsHookEx(KeyBdHook.hook)
print messages
def KeyboardProc(nCode, wParam, lParam):
"""http://msdn.microsoft.com/en-us/library/ms644985(v=vs.85).aspx"""
if nCode < 0:
return ctypes.windll.user32.GetNextHookEx(KeyBdHook.hook,
nCode, wParam, lParam)
else:
ctypes.windll.kernel32.RtlMoveMemory(ctypes.addressof(KeyBdHook.kStruct),
ctypes.c_void_p(lParam),
ctypes.sizeof(lParam))
messages.append(KeyBdHook.kStruct)
return ctypes.windll.user32.GetNextHookEx(KeyBdHook.hook,
nCode, wParam, lParam)
def SetWindowsHookEx(idHook, lpFn, hMod, dwThreadId):
WinFunc = ctypes.WINFUNCTYPE(c_ulong, c_ulong, c_ulong, c_ulong)
return ctypes.windll.user32.SetWindowsHookExA(idHook, WinFunc(lpFn), hMod, dwThreadId)
def GetModuleHandle(lpModuleName):
return ctypes.windll.kernel32.GetModuleHandleA(lpModuleName)
def UnhookWindowsHookEx(hHook):
return ctypes.windll.user32.UnhookWindowsHookEx(hHook)
class HHook():
def __init__(self):
self.hook = HHOOK
self.kStruct = KBLLHOOKSTRUCT()
class KBLLHOOKSTRUCT(Structure):
"""http://msdn.microsoft.com/en-us/library/ms644967(v=vs.85).aspx"""
_fields_ = [("vkCode", c_ulong),
("scanCode", c_ulong),
("flags", c_ulong),
("time", c_ulong),
("dwExtraInfo", POINTER(c_ulong))]
The problem is that it never enters the KeyboardProc function. I think that I may have to use it as a C-type function using ctypes.WINFUNCTYPE or ctypes.CFUNCTYPE, but I cannot figure it out. Windows does not seem to cause an error in SetWindowsEx either.
I assume that it does not process the KeyboardProc parameter passed to SetWindowsEx. Any ideas on how to do this so that Windows can enter data into it? Thank.