[orebla]

Hi,
I've a problem when I would to create a control code like timer

Example:

When it's 12:00AM the code print a messagge info: "It is 12:00AM!"

I think it's possible with a "while" cicle.
But whit "while" is not more expansive for the RAM??

Thank for answer!

[croozeus]

Hi orebla

Replying to your subject of the thread how to create a timer

timer = e32.Ao_timer()
timer.after( time, function_name )

where time is the time in seconds

If you want to print the time then you can use time function from ctime module.And yes you can make a while loop running to print the time at several intervals.

However i didnt get your this question

I think it's possible with a "while" cicle.
But whit "while" is not more expansive for the RAM??

Hope that helps

Best Regards
croozeus

[orebla]

Sorry for my bad english!

The function AO_timer() checks whether the time, for example, is 12:00 AM.
But the function controls the time only once, when the script is loaded, right?

My question is: But using the while loop to check the time not create a loop infinitive?


I hope that I explained

[croozeus]

Originally Posted by orebla

Sorry for my bad english!

The function AO_timer() checks whether the time, for example, is 12:00 AM.
But the function controls the time only once, when the script is loaded, right?

My question is: But using the while loop to check the time not create a loop infinitive?


I hope that I explained

Hello orebla

Hope I got you correct this time you can use an infinit while loop to print the time at certains intervals like below where time specifies time in seconds.The function_name specifies function which is to be repeated after time seconds and should be define in the begininng.

timer = e32.Ao_timer()
# loop forever
while True:
    timer.after( time, function_name )

Hope that helps

Best Regards
croozeus

[nlsp]

This is incorrect:

timer = e32.Ao_timer()
# loop forever
while True:
    timer.after( time, function_name )

The above will repeatedly call timer.after, as timer.after(time, function_name) will return immediately and call function_name after the number of seconds specified. This will cause a RuntimeError: Timer pending - cancel first.

The correct way (you can search this forum for more examples) is to restart the timer inside the called function.

import e32
timer = e32.Ao_timer()
delay = 4.0
def do_something():
  # your code to be repeated every interval goes here
  timer.after(delay, do_something)

# still have to start the timer once
timer.after(delay, do_something)

Note that before exiting python, you should call timer.cancel().
One way to do that is using atexit.

import atexit
atexit.register(timer.cancel)

[croozeus]

Hello nlsp

True,we do get a runtime error in my code however its not wrong.The runtime error occurs because the timer is still pending and we need to cancel it.As My code before I now define the body of the function_name as in the below code.

import e32
def function_name():
    print "Hello"
    timer.after( 4, function_name )

timer = e32.Ao_timer()
# loop forever
while True:
    timer.after( 4, function_name )

The code works and prints hello at every 4 seconds.You are true that the runtime error occurs in this case and so to avoid this we can use this code as well and it would be better as we donot get the runtime error in it!

import e32
timer = e32.Ao_timer()
delay = 4.0
def do_something():
  # your code to be repeated every interval goes here
  timer.after(delay, do_something)

# still have to start the timer once
timer.after(delay, do_something)

However I donot use the timer = e32.Ao_timer() personally in my applications.I just use the e32.ao_sleep(t) in a while loop when I am required to repeat the function as below

t=4
While True:
    e32.ao_sleep(t)
    function_name()

Best Regards
croozeus

[orebla]

Thanks for answer!!

I understand how use the function Ao_timer.
But how can print a message at twelve o'clock??

[nlsp]

Originally Posted by orebla

Thanks for answer!!

I understand how use the function Ao_timer.
But how can print a message at twelve o'clock??

I'm not sure there exists a ready to use interface to do something like timer.at(<sometime>, func). However you can get the current time, calculate how many seconds in the future you want to be called back, and use timer.after() to do your thing at the calculated time.

[orebla]

Ok I get current time with time.localtime()

but is very difficult for me calculate the difference between two date.

What can I do?

[nlsp]

import e32
import time

def waittime():
  t = list(time.localtime())
  n = time.mktime(t)
  t[3] = t[4] = t[5] = 0
  t[2] += 1
  return time.mktime(t) - n

timer=e32.Ao_timer()
w = waittime()
while w > 60:
  h = w / 3600
  m = w % 3600 / 60
  s = w % 60
  print "waiting %02d:%02d:%02d ..." % (h, m, s)
  timer.after(s or 60)
  w = waittime()

timer.after(w)
print "It's time!!"