python 判断用户是否空闲(暂离时间)

http://stackoverflow.com/questions/1083178/wxpython-trapping-mouse-keyboard-events-without-window-focus

from ctypes import Structure, windll, c_uint, sizeof, byref

class LASTINPUTINFO(Structure):
    _fields_ = [
        ('cbSize', c_uint),
        ('dwTime', c_uint),
    ]

def get_idle_duration():
    lastInputInfo = LASTINPUTINFO()
    lastInputInfo.cbSize = sizeof(lastInputInfo)
    windll.user32.GetLastInputInfo(byref(lastInputInfo))
    millis = windll.kernel32.GetTickCount() - lastInputInfo.dwTime
    return millis / 1000.0