Python监听键盘和鼠标事件的示例代码

我们可以利用windows提供的api函数来实现对系统键盘事件和鼠标事件的监听，主要利用的是SetWindowsHookEx函数，这个函数可以允许调用者传入一个钩子函数也叫回调函数，当指定的事件发生时，你

传入的函数就会被触发，有些事件是进程级的，有些事件是系统级的，这里我们用WH_KEYBOARD_LL来监听系统键盘事件，用WH_MOUSE_LL来监听鼠标事件，注意不是WH_KEYBOARD，使用WH_KEYBOARD是无法监听到外部

程序的事件的，这个可以在windows官方文档里面看到说明，要用WH_KEYBOARD来监听系统键盘必须写dll去实现。

因为用到了一些宏定义在win32con里面已经有了，所以需要安装一下pypiwin32，当然如果你将这些宏定义写在自己的文件中，那么就不用安装pypiwin32了。

安装pypiwin32

pip install pypiwin32

# coding=utf-8
from ctypes import *
from ctypes import wintypes
import win32con

SetWindowsHookEx=windll.user32.SetWindowsHookExA
UnhookWindowsHookEx=windll.user32.UnhookWindowsHookEx
CallNextHookEx=windll.user32.CallNextHookEx
GetMessage=windll.user32.GetMessageA
GetModuleHandle=windll.kernel32.GetModuleHandleW
#保存键盘钩子函数句柄
keyboard_hd = None
#保存鼠标钩子函数句柄
mouse_hd = None


class KBDLLHOOKSTRUCT(Structure):
  _fields_ = [
    ('vkCode',c_int),
    ('scanCode', c_int),
    ('flags', c_int),
    ('time', c_int),
    ('dwExtraInfo', c_uint),
    ('',c_void_p)
  ]


class POINT(Structure):
  _fields_ = [
    ('x',c_long),
    ('y',c_long)
  ]


class MSLLHOOKSTRUCT(Structure):
  _fields_ = [
    ('pt',POINT),
    ('hwnd',c_int),
    ('wHitTestCode',c_uint),
    ('dwExtraInfo',c_uint),
  ]


def wait_for_msg():
  msg = wintypes.MSG()
  GetMessage(msg, 0, 0, 0)


def keyboard_pro(nCode, wParam, lParam):
  """
  函数功能：键盘钩子函数，当有按键按下时此函数被回调
  """
  if nCode == win32con.HC_ACTION:
    KBDLLHOOKSTRUCT_p = POINTER(KBDLLHOOKSTRUCT)
    param=cast(lParam,KBDLLHOOKSTRUCT_p)
    print(param.contents.vkCode)
  return CallNextHookEx(keyboard_hd, nCode, wParam, lParam)


def start_keyboard_hook():
  """
  函数功能：启动键盘监听
  """
  HOOKPROTYPE = CFUNCTYPE(c_int, c_int, c_int, POINTER(c_void_p))
  pointer = HOOKPROTYPE(keyboard_pro)
  keyboard_hd = SetWindowsHookEx(
    win32con.WH_KEYBOARD_LL,
    pointer,
    GetModuleHandle(None),
    0)
  wait_for_msg()


def stop_keyboard_hook():
  """
  函数功能：停止键盘监听
  """
  UnhookWindowsHookEx(keyboard_hd)


def mouse_pro(nCode, wParam, lParam):
  """
  函数功能：鼠标钩子函数，当有鼠标事件，此函数被回调
  """
  if nCode == win32con.HC_ACTION:
    MSLLHOOKSTRUCT_p = POINTER(MSLLHOOKSTRUCT)
    param=cast(lParam,MSLLHOOKSTRUCT_p)
    #鼠标左键点击
    if wParam == win32con.WM_LBUTTONDOWN:
      print("左键点击，坐标：x:%d,y:%d" % (param.contents.pt.x,param.contents.pt.y))
    elif wParam == win32con.WM_LBUTTONUP:
      print("左键抬起，坐标：x:%d,y:%d" % (param.contents.pt.x, param.contents.pt.y))
    elif wParam == win32con.WM_MOUSEMOVE:
      print("鼠标移动，坐标：x:%d,y:%d" % (param.contents.pt.x, param.contents.pt.y))
    elif wParam == win32con.WM_RBUTTONDOWN:
      print("右键点击，坐标：x:%d,y:%d" % (param.contents.pt.x, param.contents.pt.y))
    elif wParam == win32con.WM_RBUTTONUP:
      print("右键抬起，坐标：x:%d,y:%d" % (param.contents.pt.x, param.contents.pt.y))
  return CallNextHookEx(mouse_hd, nCode, wParam, lParam)


def start_mouse_hook():
  """
  函数功能：启动鼠标监听
  """
  HOOKPROTYPE = CFUNCTYPE(c_int, c_int, c_int, POINTER(c_void_p))
  pointer = HOOKPROTYPE(mouse_pro)
  mouse_hd = SetWindowsHookEx(
    win32con.WH_MOUSE_LL,
    pointer,
    GetModuleHandle(None),
    0)
  wait_for_msg()


def stop_mouse_hook():
  """
  函数功能：停止鼠标监听
  """
  UnhookWindowsHookEx(mouse_hd)

测试代码：

import HookApi

if __name__== '__main__':
  HookApi.start_keyboard_hook()

运行效果

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