Hi, new Python/Tkinter adopter here!
I'm building a little screen display to show status of a remote device
(a radio scanner) in an MVC pattern. In the top-level "view" GUI
object I'm updating the text in three Entry fields and the background
color of a Frame, all at a rate of about five cycles per second.
Works fine except it leaks memory at a rate of between 1-2K per second.
As best I can tell the problem seems to be down in Tkinter: I can pass-
out the set() calls to the StringVars and the color update and leave
everything else and my memory consumption stablizes. I can also
induce a leak by making get()s. I tried bypassing the StringVar
mechanism and doing delete()/insert() directly on the Entry widgets...
that didn't seem to solve it either.
Googling around I can see that there've been various memory leak
issues in past history, but I don't see any open issues with 8.5.7 and/
or Python 2.6.2. So I wonder if maybe I'm just making a noobish
mistake in my own code (please see below.)
I'm admitting my helplessness and pleading for help. TIA!
- Art
#! /usr/bin/env python
'''
Created on June 5, 2009
@author: acb
'''
from Tkinter import *
import tkFont
import time
import Controller
import threading
import sys
import signal
class Display:
def shutdown(foo):
sys.exit()
def __init__(self, root):
# define display fonts
self.sans1 = tkFont.Font( family="sanserif", size=24)
self.sans2 = tkFont.Font( family="sanserif", size=12)
# shutdown on window close and on control-c
root.protocol("WM_DELETE_WINDOW", self.shutdown)
def exit_handler( signal, frame ): self.shutdown()
signal.signal(signal.SIGINT, exit_handler)
# Set up the display frame and fields
self.toppad = Frame(root, height=4)
self.toppad.pack()
self.display = Frame(root)
self.indisplay = Frame(self.display, background="#ffffff")
self.spacer = Frame(self.indisplay, height=5)
self.spacer.pack(expand=YES)
self.freq = Entry(self.indisplay)
self.freqString = StringVar()
self.freq.config(justify=CENTER, font=self.sans2,
borderwidth=0, textvariable=self.freqString)
self.freq.pack(padx=10, pady=5)
self.label = Entry(self.indisplay)
self.labelString = StringVar()
self.label.config(justify=CENTER, font=self.sans1,
borderwidth=0, width=12, textvariable=self.labelString)
self.label.pack(padx=10, pady=5)
self.object = Entry(self.indisplay)
self.objectString = StringVar()
self.object.config(justify=CENTER, font=self.sans2,
borderwidth=0, textvariable=self.objectString)
self.object.pack(padx=10, pady=5)
self.spacer = Frame(self.indisplay, height=5)
self.spacer.pack(expand=YES)
self.indisplay.config()
self.indisplay.pack( fill=BOTH, padx=2, pady=2 )
self.display.pack(fill=BOTH, padx=5)
# Set up controls
self.control = Canvas(root)
self.keycode = 0
self.manBtn = Button(self.control, text="Manual")
self.manBtn.pack(side=LEFT,padx=20)
self.manBtn['command']=lambda: self.keyset(3)
self.upBtn = Button(self.control, text="Up")
self.upBtn.pack(side=LEFT,expand=YES,padx=10)
self.upBtn['command']=lambda: self.keyset(7)
self.dnBtn = Button(self.control, text="Dn")
self.dnBtn.pack(side=LEFT,expand=YES,padx=10)
self.dnBtn['command']=lambda: self.keyset(9)
self.scnBtn = Button(self.control, text="Scan")
self.scnBtn.pack(side=RIGHT,padx=20)
self.scnBtn['command']=lambda: self.keyset(15)
self.control.pack(fill=X, ipady=2, pady=4)
self.controller = Controller.Controller(self)
# command to send a keystroke to the scanner
def keyset(self, value):
self.controller.send_key(value)
# commands to update the display fields (called from the
controller)
def set_freq(self, text): self.freqString.set(text)
def set_label(self, text): self.labelString.set(text)
def set_object(self, text): self.objectString.set(text)
def set_color(self, text): self.display['background']=text
root = Tk()
disp = Display(root)
root.wm_title("PSR-600 Remote v0.4")
root.mainloop()
_______________________________________________
Tkinter-discuss mailing list
Tkinter-discuss@python.org
http://mail.python.org/mailman/listinfo/tkinter-discuss
