New submission from Mike Hobbs:
Only info (Windows event viewer): Faulting application python_cc.exe, version
0.0.0.0, faulting module python34.dll, version 3.4.3150.1013, fault address
0x001059b7
Note: python_cc.exe is renamed python.exe to identify it in task manager.
OS is Windows XP SP3
The following script crashes the python executable every few hours (not
regular, seemingly random).
The exact same script also crashes python 2.7.13. Each version has the latest
pyserial module installed for the appropriate python version.
When python 2.7 crashes, the reported error is always in _ctypes.dll which is
used extensively in the serialwin32.py for reading the serial port, but python
3.4 fails in the main DLL.
This same script has been running without a problem for several years on the
same hardware (Quad core Shuttle with CurrentCost 128 electricity monitor on
COM3, using PL2303 serial/USB chipset (probably clone)). The crashes have only
occured since harddisc replacement involving new XP installation and
reinstallation of application software.
Occasionally, the crash results in a blue screen but usually its just the task
crash notification (which I automatically dismiss using AutoIt3 watchdog
script). Everything else on the machine id running normally so the serial port
handling is the prime suspect.
import serial, sys, time, traceback, os
import xml.etree.ElementTree as ET
correction = 1.074 # 247V when CC128 is designed for 230V
path = "E:\\Apache\\htdocs\\energy\\elec_data\\"
log = "E:\\Apache\\htdocs\\energy\\log.txt"
ser = None
amps = [0,0,0,0]
def localtime():
y,m,d,h,mn,s,wd,b,c = time.localtime()
return '%4d%02d%02d %02d%02d%02d' % (y,m,d,h,mn,s)
def dbg(msg):
msg = msg.strip()
print(msg)
if len(msg) <= 2: return
global log
# avoid huge files
if os.path.getsize(log) > 200:
y,m,d,h,mn,s,wd,b,c = time.localtime()
old = 'log_%4d%02d%02d_%02d%02d%02d.txt' % (y,m,d,h,mn,s)
os.rename(log, old)
f = open(log, 'a')
t = localtime()
f.write('%s %s\n' % (t, msg))
f.close()
try:
ser = serial.Serial(port="COM3", baudrate=57600, bytesize=serial.EIGHTBITS,
parity=serial.PARITY_NONE, stopbits=serial.STOPBITS_ONE, timeout=3)
dbg("Connected to CurrentCost meter")
except serial.SerialException:
dbg("Failed to connect to CurrentCost meter")
sys.exit(1)
err_count = 0
while True:
try:
line = ser.readline().strip() # should be something every 6 seconds
if line:
watts = ''
try:
msg = ET.fromstring(line)
watts = msg.findtext('ch1/watts')
watts = float(watts)
err_count = 0
except:
watts = ''
err_count += 1
finally:
try:
del exc_info
except:
pass
if watts:
# _ _ _ _
# _ or __ regarded as bogus
amps[0] = amps[1]; amps[1] = amps[2]; amps[2] = amps[3]
amps[3] = float(watts)*.00405 # 247 volts
bogus = False
if amps[1]>0 and amps[1] < amps[0]/2:
if amps[1] < amps[2]/2: bogus = True
if amps[1] < amps[3]/2 and amps[2] < amps[3]/2: bogus = True
#dbg('%s %s %s %s %s' %
(amps[0],amps[1],amps[2],amps[3],bogus))
if not bogus and amps[2]>0 and amps[3]>0:
y,m,d,h,mn,s,a,b,c = time.localtime()
try:
line = '%f,%f' % (float(h)+float(mn)/60+float(s)/3600,
amps[1])
f = open('%s\\%4d%02d%02d.csv' % (path,y,m,d), 'a')
f.write('%s\n' % line)
f.close()
except:
exc_info = sys.exc_info()
dbg('CC EXCEPTION %s ' %
traceback.format_exception(*exc_info))
finally:
try:
del exc_info # force garbage collection
except:
pass
else:
if err_count > 100:
dbg("100 consecutive errors detected")
break
except serial.SerialException:
exc_info = sys.exc_info()
dbg('CC EXCEPTION %s ' % traceback.format_exception(*exc_info))
ser.close()
sys.exit(1)
except KeyboardInterrupt:
ser.close()
sys.exit(0)
except:
exc_info = sys.exc_info()
dbg('CC EXCEPTION %s ' % traceback.format_exception(*exc_info))
finally:
try:
del exc_info # force garbage collection
except:
pass
ser.close()
sys.exit(1)
--
components: Windows
mes
