wxPython and thread memory problems?

[plumpy321]

Hi,

I took an example from wxPython with the IE web browser and
created a refresh button to automatically refresh a web page in 5
second intervals. But I notice that the memory utilization in Python
keeps increasing over time. Can anyone tell me why this is happening?
Here is my code:

============================================================================

import wx, re
import time, thread
from urlparse import *

if wx.Platform == '__WXMSW__':
import wx.lib.iewin as iewin

refresh = 0

#----------------------------------------------------------------------

class TestPanel(wx.Panel):
def __init__(self, parent, frame=None):
wx.Panel.__init__(
self, parent, -1,
style = wx.TAB_TRAVERSAL |
wx.CLIP_CHILDREN |
wx.NO_FULL_REPAINT_ON_RESIZE
)

self.current = "http://www.google.com"
self.frame = frame

if frame:
self.titleBase = frame.GetTitle()

sizer = wx.BoxSizer(wx.VERTICAL)
btnSizer = wx.BoxSizer(wx.HORIZONTAL)

self.ie = iewin.IEHtmlWindow(self, -1, style =
wx.NO_FULL_REPAINT_ON_RESIZE)

btn = wx.Button(self, -1, "Open", style=wx.BU_EXACTFIT)
self.Bind(wx.EVT_BUTTON, self.OnOpenButton, btn)
btnSizer.Add(btn, 0, wx.EXPAND|wx.ALL, 2)

btn = wx.Button(self, -1, "Home", style=wx.BU_EXACTFIT)
self.Bind(wx.EVT_BUTTON, self.OnHomeButton, btn)
btnSizer.Add(btn, 0, wx.EXPAND|wx.ALL, 2)

btn = wx.Button(self, -1, "<--", style=wx.BU_EXACTFIT)
self.Bind(wx.EVT_BUTTON, self.OnPrevPageButton, btn)
btnSizer.Add(btn, 0, wx.EXPAND|wx.ALL, 2)

btn = wx.Button(self, -1, "-->", style=wx.BU_EXACTFIT)
self.Bind(wx.EVT_BUTTON, self.OnNextPageButton, btn)
btnSizer.Add(btn, 0, wx.EXPAND|wx.ALL, 2)

btn = wx.Button(self, -1, "Stop", style=wx.BU_EXACTFIT)
self.Bind(wx.EVT_BUTTON, self.OnStopButton, btn)
btnSizer.Add(btn, 0, wx.EXPAND|wx.ALL, 2)

btn = wx.Button(self, -1, "Search", style=wx.BU_EXACTFIT)
self.Bind(wx.EVT_BUTTON, self.OnSearchPageButton, btn)
btnSizer.Add(btn, 0, wx.EXPAND|wx.ALL, 2)

btn = wx.Button(self, -1, "Refresh", style=wx.BU_EXACTFIT)
self.Bind(wx.EVT_BUTTON, self.OnRefreshPageButton, btn)
btnSizer.Add(btn, 0, wx.EXPAND|wx.ALL, 2)

btn = wx.Button(self, -1, "AutoRefresh", style=wx.BU_EXACTFIT)
self.Bind(wx.EVT_BUTTON, self.OnAutoRefreshPageButton, btn)
btnSizer.Add(btn, 0, wx.EXPAND|wx.ALL, 2)

txt = wx.StaticText(self, -1, "Location:")
btnSizer.Add(txt, 0, wx.CENTER|wx.ALL, 2)

self.location = wx.TextCtrl(self, -1, "",
style=wx.TE_PROCESS_ENTER)

self.location.Bind(wx.EVT_CHAR, self.OnLocationReturn)
btnSizer.Add(self.location, 1, wx.EXPAND|wx.ALL, 2)

sizer.Add(btnSizer, 0, wx.EXPAND)
sizer.Add(self.ie, 1, wx.EXPAND)

self.ie.LoadUrl(self.current)

self.SetSizer(sizer)
# Since this is a wxWindow we have to call Layout ourselves
self.Bind(wx.EVT_SIZE, self.OnSize)

# Hook up the event handlers for the IE window
self.Bind(iewin.EVT_DocumentComplete, self.OnDocumentComplete,
self.ie)

thread.start_new_thread(self.refresh_url, (5,))

def OnSize(self, evt):
self.Layout()

def OnLocationReturn(self, evt):
if evt.KeyCode() == wx.WXK_RETURN:
self.ie.Navigate(self.location.GetValue(),
iewin.NAV_NoReadFromCache | iewin.NAV_NoWriteToCache)
else:
evt.Skip()

def OnOpenButton(self, event):
dlg = wx.TextEntryDialog(self, "Open Location",
"Enter a full URL or local path",
self.current, wx.OK|wx.CANCEL)
dlg.CentreOnParent()

if dlg.ShowModal() == wx.ID_OK:
self.current = dlg.GetValue()
self.ie.Navigate(self.current,
iewin.NAV_NoReadFromCache | iewin.NAV_NoWriteToCache)

dlg.Destroy()

def OnHomeButton(self, event):
self.ie.GoHome() ## ET Phone Home!

def OnPrevPageButton(self, event):
self.ie.GoBack()

def OnNextPageButton(self, event):
self.ie.GoForward()

def OnStopButton(self, evt):
self.ie.Stop()

def OnSearchPageButton(self, evt):
self.ie.GoSearch()

def OnRefreshPageButton(self, evt):
self.ie.RefreshPage(iewin.REFRESH_COMPLETELY)

def OnAutoRefreshPageButton(self, evt):
global refresh
refresh = not refresh

def refresh_url(self, delay):
global refresh
while (1):
time.sleep(delay)
if refresh:
self.ie.Navigate(self.ie._get_LocationURL(),
iewin.NAV_NoReadFromCache |
iewin.NAV_NoWriteToCache)

def OnDocumentComplete(self, evt):
self.current = evt.URL
self.location.SetValue(self.current)

class Frame(wx.Frame):
def __init__(self, parent=None, id=-1, title='Title',
pos=wx.DefaultPosition, size=(640, 480)):
wx.Frame.__init__(self, parent, id, title, pos, size)

self.attr = {}
self.attr['panel'] = TestPanel(self)

class App(wx.App):
def OnInit(self):
self.attr = {}

self.attr['frame'] = Frame(title='My Window')
self.attr['frame'].Show()
self.SetTopWindow(self.attr['frame'])

return True

def main():
app = App()
app.MainLoop()

if __name__ == '__main__':
main()


#----------------------------------------------------------------------