python wnck non restituisce alcun dato fino a dopo un pdb.set_trace ()

Question

Su Ubuntu Linux / Gnome, sto cercando di utilizzare l'associazione wnck di Python per ottenere un elenco di tutte le finestre aperte.

Il mio codice ha questo aspetto:

#! /usr/bin/python

from pprint import pprint
import wnck

screen = wnck.screen_get_default()

pprint(screen.get_windows())

import pdb ; pdb.set_trace()

pprint(screen.get_windows())

L'output è come questo:

** (windowlist.py:4501): WARNING **: Trying to register gtype 'WnckWindowState' as enum when in fact it is of type 'GFlags'

** (windowlist.py:4501): WARNING **: Trying to register gtype 'WnckWindowActions' as enum when in fact it is of type 'GFlags'

** (windowlist.py:4501): WARNING **: Trying to register gtype 'WnckWindowMoveResizeMask' as enum when in fact it is of type 'GFlags'
[]
> /home/rory/personal/diriu/windowlist.py(12)<module>()
-> pprint(screen.get_windows())
(Pdb) c
[<wnck.Window object at 0xb61db0cc (WnckWindow at 0x992c000)>,
 <wnck.Window object at 0xb61db0f4 (WnckWindow at 0x992c0a8)>,
 <wnck.Window object at 0xb61db11c (WnckWindow at 0x992c150)>,
 <wnck.Window object at 0xb61db144 (WnckWindow at 0x992c1f8)>,
 <wnck.Window object at 0xb61db16c (WnckWindow at 0x992c2a0)>,
 <wnck.Window object at 0xb61db194 (WnckWindow at 0x992c348)>,
 <wnck.Window object at 0xb61db1bc (WnckWindow at 0x992c3f0)>,
 <wnck.Window object at 0xb61db1e4 (WnckWindow at 0x992c498)>,
 <wnck.Window object at 0xb61db20c (WnckWindow at 0x992c540)>,
 <wnck.Window object at 0xb61db234 (WnckWindow at 0x992c5e8)>,
 <wnck.Window object at 0xb61db25c (WnckWindow at 0x992c690)>,
 <wnck.Window object at 0xb61db284 (WnckWindow at 0x992c738)>]

La prima chiamata get_windows() restituisce [], un elenco vuoto.La seconda chiamata get_windows() restituisce un elenco di finestre aperte.Nel pdb, premo solo c per continuare e non faccio nulla (in pdb).

Se commento il pdb, entrambe le chiamate get_windows() restituiscono [].Se ripeto la chiamata get_windows() molte volte prima del pdb, non c'è nulla.Se ripeto la chiamata get_windows() molte volte dopo il pdb, ottengo continuamente un elenco completo.

Perché questa chiamata funziona solo dopo un PDB vuoto?Come faccio a farlo funzionare senza un PDB?

Answer 1

File so-wnck.py (da Come potrei afferrare tutte le finestre con una certa parola nei titoli? )

import pygtk
pygtk.require('2.0')
import gtk
import wnck

screen = wnck.screen_get_default()
while gtk.events_pending():
    gtk.main_iteration()

windows = screen.get_windows()
print (windows)

python so-wnck.py

** (so-wnck.py:2367): WARNING **: Trying to register gtype 'WnckWindowState' as enum when in fact it is of type 'GFlags'

** (so-wnck.py:2367): WARNING **: Trying to register gtype 'WnckWindowActions' as enum when in fact it is of type 'GFlags'

** (so-wnck.py:2367): WARNING **: Trying to register gtype 'WnckWindowMoveResizeMask' as enum when in fact it is of type 'GFlags'
[<wnck.Window object at 0xb7566694 (WnckWindow at 0x97c51f8)>,
 <wnck.Window object at 0xb75666bc (WnckWindow at 0x97c52a0)>, 
 <wnck.Window object at 0xb75666e4 (WnckWindow at 0x97c5348)>, 
 <wnck.Window object at 0xb756670c (WnckWindow at 0x97c53f0)>, 
 <wnck.Window object at 0xb7566734 (WnckWindow at 0x97c5498)>,
 <wnck.Window object at 0xb756675c (WnckWindow at 0x97c5540)>, 
 <wnck.Window object at 0xb7566784 (WnckWindow at 0x97c55e8)>]

Answer 2

Non lavoro con wnck ma penso che nel caso con pdb tempo tra due chiamate per get_window abbastanza per Windows list inizializzato.Prova a utilizzare la sospensione con un po 'di ritardo prima di chiamare get_window.