from ctypes import *

from ctypes import wintypes

from time import sleep

#调用Windows系统动态链接库user32.dll

user32 = windll.user32

p = wintypes.POINT()

buffer = create_string_buffer(255)

while True:

    sleep(0.5)

    #获取鼠标位置

    user32.GetCursorPos(byref(p))

    #获取鼠标所处位置的窗口句柄

    HWnd = user32.WindowFromPoint(p)

    #注释掉的代码本来是可以实现星号密码查看的，在Win7以后的系统中失效了

    #dwStyle = user32.GetWindowLongA(HWnd, -16) #-16是GWL_STYLE消息的值

    #user32.SetWindowWord(HWnd, -16, 0)

    sleep(0.2)

    #获取窗口文本

    user32.SendMessageA(HWnd, 13, 255, byref(buffer)) #13是WM_GETTEXT消息的值

    #user32.SetWindowLongA(HWnd, -16, dwStyle)

    print(buffer.value.decode('gbk'))