multithreading - Python GUI Threading -


i want have function run continuously within tkinter gui. have attached shell code:

#!/usr/bin/env python3  import tkinter tk time import sleep import os import sys  class application(frame):      def __init__(self, master):         super(application, self).__init__(master)         self.grid()         self.create_widgets()          def create_widgets(self):         ......  root = tk()    def run_continously:     ... -- calls sleep -- ...     root.after(3000, run_continuously)   root.geometry('%dx%d+%d+%d' % (w, h, x, y)) app = application(root) root.after(3000, run_continuously)           root.mainloop()

when running gui tends run 'run_continuously' function once , gui freezes up. suspect poking around due sleep function (which call in run_continuously function)

how go implementing 'run_continuously' function in simple thread around issue? running function in thread me around problem? 'run_continuously' function not need interact @ application class. want run in background , stop when mainloop finished.

here end of code:

def run_continuously(quit_flag):     print("in it")     if not quit_flag:         gpio.output(dir_pin, true)         in range(steps):             print("in loop")             gpio.output(step_pin, true)             sleep(sdelay)             gpio.output(step_pin, false)             sleep(sdelay)         sleep(wait_time)         gpio.output(dir_pin, false)             in range(steps):             gpio.output(step_pin, true)             sleep(sdelay)             gpio.output(step_pin, false)             sleep(sdelay)             print("run motor")         root.after(1000, run_continuously(quit_flag,))   #================================================================= # main #=================================================================  root = tk()                            # create gui root object press1 = stringvar() press2 = stringvar()  x = 275 y = 50 w = 580 h = 250   root.geometry('%dx%d+%d+%d' % (w, h, x, y)) app = application(root)          # create root application window quit_flag = false                 root.after(0, app.read_pressure) motor_thread = threading.thread(target=run_continuously, args=(quit_flag,)).start() root.mainloop() quit_flag=true motor_thread.join()

this minimal, complete, , verifiable example exits cleanly if 'quit' button pressed or ctrl-c pressed:

from tkinter import * import multiprocessing import threading import time import logging   class application(frame):     def create_widgets(self):         self.quit_button = button(self)         self.quit_button['text'] = 'quit'         self.quit_button['fg'] = 'red'         self.quit_button['command'] = self.quit         self.quit_button.pack({'side': 'left'})      def __init__(self, master=none):         frame.__init__(self, master)         self.quit_button = none         self.pack()         self.create_widgets()         self.poll()      def poll(self):         """         method required allow mainloop receive keyboard         interrupts when frame not have focus         """         self.master.after(250, self.poll)   def worker_function(quit_flag):     counter = 0     while not quit_flag.value:         counter += 1         logging.info("work # %d" % counter)         time.sleep(1.0)   format = '%(levelname)s: %(filename)s: %(lineno)d: %(message)s' logging.basicconfig(level=logging.debug, format=format) root = tk() app = application(master=root) quit_flag = multiprocessing.value('i', int(false)) worker_thread = threading.thread(target=worker_function, args=(quit_flag,)) worker_thread.start() logging.info("quit_flag.value = %s" % bool(quit_flag.value)) try:     app.mainloop() except keyboardinterrupt:     logging.info("keyboard interrupt") quit_flag.value = true logging.info("quit_flag.value = %s" % bool(quit_flag.value)) worker_thread.join()

Comments

Post a Comment

Popular posts from this blog

javascript - jQuery: Add class depending on URL in the best way -

i have html progress meter: <div class="col-md-3" style="margin-left: -20px;"> <div class="progress-pos active" id="progess-1"> <div class="progress-pos-inner"> login </div> </div> </div> <div class="col-md-3 progress-pos-container"> <div class="progress-pos" id="progess-2"> <div class="progress-pos-inner"> scan items </div> </div> </div> <div class="col-md-3 progress-pos-container"> <div class="progress-pos" id="progess-3"> <div class="progress-pos-inner"> confirm address </div> </div> </div> <div class="col-md-3 progress-pos-container"> <div class="progress-pos" id="progess-4"> <div class="progress-pos-in...
Read more

caching - How to check if a url path exists in the service worker cache -

i need check if particular url path exists in service worker cache. example, suppose url is: /myserviceworker/service?a=110&b=70 this url exists in cache, there many of them different values of , b. now, suppose want refresh of these urls, how can that? i want know how access key values service worker cache. if know key, plan follows: var url = new url(key); if(url.pathname === "\/myserviceworker/service") refetch key but not sure how cache key , in format is. mean, string or url? cache api has match() method returns promise resolving in response object if match or undefined if no match exists. second parameter object can specify ignoresearch not take account url parameters. the ignoresearch option supported firefox ( chrome status here ). in other hand, retrieve cache entries, can use keys() method.
Read more

Redirect to a HTTPS version using .htaccess -

i need modify .htaccess file redirect urls https version without "www". http://example.com --> https://example.com http://www.example.com --> https://example.com https://www.example.com --> https://example.com this how .htaccess file looks like: rewriteengine on rewritecond %{request_filename} !-d rewritecond %{request_filename} !-f rewriterule ^(.*)$ redirect.php?id=$1&page=$2 [qsa,l] what modifications need make .htaccess in order forward https without "www"? it depends on doing current code. looks file called redirect trying display php page seo friendly url. think might confusing people. anyway, need , force https without www, need 1 more rule above. also second rule needs two capture groups in rewriterule test string because wanting 2 different values using $1 , $2 references. rewriteengine on #rediect www non www and/or http https --- combinations. rewritecond %{http_host} !^example\.com [nc,or] rewritecond %{https} !^...
Read more