# Author: c8
# Date created: 9/7/12
# Purpose: Set windows to lock itself(upon timeout) with a screensaver
# if no internet connection found.
from _winreg import *
import urllib2, socket
debug = False
########################## TO RUN ####################################
# schedule to run every x mins
########################### DEF ######################################
def locker(set):
# make set in terms of 1/0
set = 1 if set else 0
subkey = r'Control Panel\Desktop'
# to ensure screensaver is set to 'none' (straight to lock screen)
deleteRegistryKey(HKEY_CURRENT_USER, subkey, r'SCRNSAVE.EXE')
data= [('ScreenSaverIsSecure', REG_SZ, str(set)),
('ScreenSaveTimeOut', REG_SZ, '420')]
for valueName, valueType, value in data:
modifyRegistry(HKEY_CURRENT_USER, subkey, valueName,
valueType, value)
if debug: message = 'changed to locked' if set else 'changed to unlocked'
if debug: print message
def modifyRegistry(key, sub_key, valueName, valueType, value):
"""
A simple function used to change values in
the Windows Registry.
"""
try:
key_handle = OpenKey(key, sub_key, 0, KEY_ALL_ACCESS)
except WindowsError:
key_handle = CreateKey(key, sub_key)
SetValueEx(key_handle, valueName, 0, valueType, value)
CloseKey(key_handle)
def deleteRegistryKey(key, sub_key, name):
"""
A simple function used to delete values in
the Windows Registry if present. Silently ignores failure
if value doesn't exist.
"""
try:
key_handle = OpenKey(key, sub_key, 0, KEY_ALL_ACCESS)
except WindowsError:
if debug: print 'No such key'
return
try:
DeleteValue(key_handle, name)
except WindowsError:
if debug: print "Value doesn't exist"
return
CloseKey(key_handle)
def internet_on():
# list of sites not likely to go down soon: google.com, microsoft.com etc
sites = ['173.194.79.94', '74.125.113.99', '64.4.11.20',
'173.194.33.21', '96.16.97.11']
for i in sites:
try:
site = 'http://%s' % (i)
response=urllib2.urlopen(site,timeout=1)
return True
# if urllib error, cant find site etc
except urllib2.URLError as err:
continue
# if timeout - occurs on some connections occasionally
except socket.timeout:
continue
return False
################################## CODE ######################################
# if connected to internet
if internet_on():
# set windows to unlocked
locker(False)
else:
# set windows to locked
locker(True)
Diff to Previous Revision
--- revision 1 2012-07-09 20:45:33
+++ revision 2 2012-07-09 20:56:22
@@ -1,5 +1,5 @@
# Author: c8
-# Date: Created: 9/7/12
+# Date created: 9/7/12
# Purpose: Set windows to lock itself(upon timeout) with a screensaver
# if no internet connection found.
