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POWindows hook with Python
 

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    <p>Hey guys. I'm trying to get a hook into windows and use Python to record keystrokes. For this, I'm using a LowLevelKeyboard Callback procedure.</p> <pre><code>def run(): global KeyBdHook global messages KeyBdHook = HHook() messages = [] start = time.time() #Record keystrokes for 2 seconds. while time.time() &lt; (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 &lt; 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))] </code></pre> <p>The problem with this is it never enters the KeyboardProc function. I'm thinking that I might have to cast it as a C-type function using ctypes.WINFUNCTYPE or ctypes.CFUNCTYPE, but I can't figure it out. Windows doesn't seem to be throwing an error on SetWindowsEx either.</p> <p>I'm assuming it's not handling the KeyboardProc parameter being passed into SetWindowsEx. Any ideas on how to cast this so Windows can input data into it? Thanks.</p>
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