[英]Using threads in PyGObject with GTK3 in python3
因此,我試圖使用線程在基於Python3的應用程序中實現阻止操作。
#!/usr/bin/env python3
import gi, os, threading, Skype4Py
gi.require_version('Gtk', '3.0')
from gi.repository import Gtk, GLib, GObject
skype = Skype4Py.Skype()
def ConnectSkype():
skype.Attach()
class Contacts_Listbox_Row(Gtk.ListBoxRow):
def __init__(self, name):
# super is not a good idea, needs replacement.
super(Gtk.ListBoxRow, self).__init__()
self.names = name
self.add(Gtk.Label(label=name))
class MainInterfaceWindow(Gtk.Window):
"""The Main User UI"""
def __init__(self):
Gtk.Window.__init__(self, title="Python-GTK-Frontend")
# Set up Grid object
main_grid = Gtk.Grid()
self.add(main_grid)
# Create a listbox which will contain selectable contacts
contacts_listbox = Gtk.ListBox()
for handle, name in self.GetContactTuples():
GLib.idle_add(contacts_listbox.add, Contacts_Listbox_Row(name))
GLib.idle_add(main_grid.add, contacts_listbox)
# Test label for debug
label = Gtk.Label()
label.set_text("Test")
GLib.idle_add(main_grid.attach_next_to, label, contacts_listbox, Gtk.PositionType.TOP, 2, 1)
def GetContactTuples(self):
"""
Returns a list of tuples in the form: (username, display name).
Return -1 if failure.
"""
print([(user.Handle, user.FullName) for user in skype.Friends]) # debug
return [(user.Handle, user.FullName) for user in skype.Friends]
if __name__ == '__main__':
threads = []
thread = threading.Thread(target=ConnectSkype) # potentially blocking operation
thread.start()
threads.append(thread)
main_window = MainInterfaceWindow()
main_window.connect("delete-event", Gtk.main_quit)
main_window.show_all()
print('Calling Gtk.main')
Gtk.main()
基本思想是,這個簡單的程序應該從Skype API中獲取聯系人列表,並構建一個元組列表。 GetContactTuples
函數在其設計中成功,我放置的打印調用驗證了這一點。 但是,該程序會無限期掛起,並且永遠不會呈現接口。 有時,它會產生涉及線程和/或資源可用性的隨機錯誤。 一旦這樣的錯誤是
(example.py:31248): Gdk-WARNING **: example.py: Fatal IO error 11 (Resource temporarily unavailable) on X server :1.
我知道它與線程的使用有關,但是根據這里的文檔,似乎只是在接口更新之前添加GLib.idle_add
調用就足夠了。 所以問題是,為什么這不起作用,我怎么能糾正上面的樣本?
更新:如果GLib.idle_add
被添加到與GTK交互的每一行,它會得到一個不同的錯誤。 [xcb] Unknown request in queue while dequeuing [xcb] Most likely this is a multi-threaded client and XInitThreads has not been called [xcb] Aborting, sorry about that. python: xcb_io.c:179: dequeue_pending_request: Assertion '!xcb_xlib_unknown_req_in_deq' failed. Aborted (core dumped)
根據您的庫版本(在Gobject
3.10.2中不再需要),您可能需要使用GObject.threads_init()
實際需要顯式初始化線程,如下所示:
if __name__ == '__main__':
threads = []
thread = threading.Thread(target=ConnectSkype) # potentially blocking operation
thread.start()
threads.append(thread)
main_window = MainInterfaceWindow()
main_window.connect("delete-event", Gtk.main_quit)
GObject.threads_init()
main_window.show_all()
print('Calling Gtk.main')
Gtk.main()
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