wxpython application ( problem ? )

[vedrandekovic]

Hello,

Here is sample of my simple script with wxpython and modules:
subprocess,threading, directpython.......

Code sample:

import wx
import wx.aui
app=wx.App()
frame=wx.Frame(None,title="New project")

#There is also part with wx.aui

frame.Show()
app.MainLoop()


After a few minutes wx application does destroy. Any ides why?

 

[Marc 'BlackJack' Rintsch]

Here is sample of my simple script with wxpython and modules:
subprocess,threading, directpython.......

Are you accessing the GUI from threads?

Ciao,
Marc 'BlackJack' Rintsch

 

[vedrandekovic]

Are you accessing the GUI from threads?

Ciao,
Marc 'BlackJack' Rintsch

Hi again,

yes, so what's the problem?


Regards,
Vedran

 

[Diez B. Roggisch]

Hi again,

yes, so what's the problem?

It is the problem. It is usually not allowed to manipulate GUI-objects from
any thread except the main-thread that runs the event-loop. All
GUI-toolkits have guidelines how to cope with that, e.g. custom events in
Qt3, or timers.

This message indicates that WX has similar means:

http://osdir.com/ml/python.matplotlib.general/2005-03/msg00208.html


Diez

 

[Bjoern Schliessmann]

yes, so what's the problem?

http://wxwidgets.org/manuals/stable/wx_wxthreadoverview.html
| If you do decide to use threads in your application, it is
| strongly recommended that no more than one thread calls GUI
| functions. The thread sample shows that it is possible for many
| different threads to call GUI functions at once (all the threads
| created in the sample access GUI), but it is a very poor design
| choice for anything except an example. The design which uses one
| GUI thread and several worker threads which communicate with the
| main one using events is much more robust and will undoubtedly
| save you countless problems (example: under Win32 a thread can
| only access GDI objects such as pens, brushes, &c created by
| itself and not by the other threads).

Regards,


Björn

 

[kyosohma]

Hello,

Here is sample of my simple script with wxpython and modules:
subprocess,threading, directpython.......

Code sample:

import wx
import wx.aui
app=wx.App()
frame=wx.Frame(None,title="New project")

#There is also part with wx.aui

frame.Show()
app.MainLoop()

After a few minutes wx application does destroy. Any ides why?

I highly recommend reading this wxPython wiki entry about using
threads in wxPython:

http://wiki.wxpython.org/LongRunningTasks

I've found it quite helpful in my own programming.

Mike