ctypes mouse_events

This is from http://blog.lazynice.net/?p=63.

The script detect the windows’s inactivity every minute. If the inactivity exceeds 5 minutes, it simply sends an mouse event that move the mouse a little, so the screensaver may think it comes from the user input then reset the timer. Just set the inactivity duration less than the screensaver’s waiting time then run it!

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

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

while True:
    d = get_idle_duration()
    if d > 60 * 5:
        windll.user32.mouse_event(1, 1, 1, 0, 0)
    time.sleep(60)

I have a small class that wraps the mouse management.

import win32gui, win32api, win32con, ctypes

class Mouse:
    """It simulates the mouse"""
    MOUSEEVENTF_MOVE = 0x0001 # mouse move 
    MOUSEEVENTF_LEFTDOWN = 0x0002 # left button down 
    MOUSEEVENTF_LEFTUP = 0x0004 # left button up 
    MOUSEEVENTF_RIGHTDOWN = 0x0008 # right button down 
    MOUSEEVENTF_RIGHTUP = 0x0010 # right button up 
    MOUSEEVENTF_MIDDLEDOWN = 0x0020 # middle button down 
    MOUSEEVENTF_MIDDLEUP = 0x0040 # middle button up 
    MOUSEEVENTF_WHEEL = 0x0800 # wheel button rolled 
    MOUSEEVENTF_ABSOLUTE = 0x8000 # absolute move 
    SM_CXSCREEN = 0
    SM_CYSCREEN = 1

    def _do_event(self, flags, x_pos, y_pos, data, extra_info):
        """generate a mouse event"""
        x_calc = 65536 * x_pos / ctypes.windll.user32.GetSystemMetrics(self.SM_CXSCREEN) + 1
        y_calc = 65536 * y_pos / ctypes.windll.user32.GetSystemMetrics(self.SM_CYSCREEN) + 1
        return ctypes.windll.user32.mouse_event(flags, x_calc, y_calc, data, extra_info)

    def _get_button_value(self, button_name, button_up=False):
        """convert the name of the button into the corresponding value"""
        buttons = 0
        if button_name.find("right") >= 0:
            buttons = self.MOUSEEVENTF_RIGHTDOWN
        if button_name.find("left") >= 0:
            buttons = buttons + self.MOUSEEVENTF_LEFTDOWN
        if button_name.find("middle") >= 0:
            buttons = buttons + self.MOUSEEVENTF_MIDDLEDOWN
        if button_up:
            buttons = buttons << 1
        return buttons

    def move_mouse(self, pos):
        """move the mouse to the specified coordinates"""
        (x, y) = pos
        old_pos = self.get_position()
        x =  x if (x != -1) else old_pos[0]
        y =  y if (y != -1) else old_pos[1]    
        self._do_event(self.MOUSEEVENTF_MOVE + self.MOUSEEVENTF_ABSOLUTE, x, y, 0, 0)

    def press_button(self, pos=(-1, -1), button_name="left", button_up=False):
        """push a button of the mouse"""
        self.move_mouse(pos)
        self._do_event(self.get_button_value(button_name, button_up), 0, 0, 0, 0)

    def click(self, pos=(-1, -1), button_name= "left"):
        """Click at the specified placed"""
        self.move_mouse(pos)
        self._do_event(self._get_button_value(button_name, False)+self._get_button_value(button_name, True), 0, 0, 0, 0)

    def double_click (self, pos=(-1, -1), button_name="left"):
        """Double click at the specifed placed"""
        for i in xrange(2): 
            self.click(pos, button_name)

    def get_position(self):
        """get mouse position"""
        return win32api.GetCursorPos()

Here is a small example:

import time
mouse = Mouse()
mouse.click((20, 10), "left")
time.sleep(2.0)

mouse.click((100, 100), "right")

I hope it helps