CODEWITHSUNDEEP
pythonraspberry-pigtk
Quintin Bauer
Quintin Bauer

Reputation: 3

How do you create a gtk window in python and also have code running in the background?

I am trying to create a GUI window with a web address inside (a video stream in this case) while also having some additional code running in the background that communicate with the GPIO ports on a Raspberry Pi. I can get the window to work but the background code only starts when the window is closed. Or if I reverse the order of the code the GPIO code stops working when the window is open. Here is some example code. 

import gtk

import webkit

import gobject

import RPi.GPIO as GPIO

from time import sleep

import os

ip = raw_input("Enter the last 3 digits of IP address: ")

awesome = "http://192.168.0." + ip + ":9090/stream"

print awesome

os.system("sudo uv4l -nopreview --auto-video_nr --driver raspicam --encoding mjpeg --width 640 --height 480 --framerate 30 --server-option '--port=9090' --server-option '--max-queued-connections=30' --server-option '--max-streams=25' --server-option '--max-threads=29'")

gobject.threads_init()

win = gtk.Window()

win.connect('destroy', lambda w: gtk.main_quit())

bro = webkit.WebView()

bro.open(awesome)

win.add(bro)

win.show_all()

gtk.main()

GPIO.setmode(GPIO.BOARD)

GPIO.setup(38, GPIO.OUT)

GPIO.setup(40, GPIO.OUT)

GPIO.setup(37, GPIO.OUT)

GPIO.setup(35, GPIO.OUT)

GPIO.output(38, GPIO.HIGH)

GPIO.output(40, GPIO.LOW)

GPIO.output(37, GPIO.LOW)

GPIO.output(35, GPIO.HIGH)

sleep(2)

Upvotes: 0

Views: 324

Answers (1)

furas
furas

Reputation: 142631

gtk.main() runs till you close window (it is call "main loop" or "event loop" and it does everything in GUI program - get key/mouse event, send it to widgets, redraw widgets, run functions when ypu press button, etc.).

You have to use Threading to run (long-running) code at the same time or use some Timer class in GUI to execute some code periodically.

Upvotes: 1

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