[英]PyGtk thread not running until main quits
数小时以来,我一直在尝试对这个问题进行排序,在网络上搜索和阅读文档都无济于事。 我正在尝试在单独的线程中执行长时间运行的任务,并在UI的进度栏中显示进度。 新的线程启动,但直到主循环退出没有给出任何时候,我都要求Gdk.threads_init()
之前Gtk.main
,我已经包围UI与调用Gdk.threads_enter()
和Gdk.threads_leave()
以下代码重现了该问题,单击“开始”按钮无效,但是一旦关闭窗口并退出主循环,我就会看到第二个线程正在工作(即,我看到打印语句相隔半秒)
class App(Gtk.Window):
def __init__(self):
super(App, self).__init__()
self.connect("destroy", self.on_destroy)
self.layout = Gtk.VBox()
self.progress = Gtk.ProgressBar()
self.layout.pack_start(self.progress, False, False, 0)
self.set_size_request(100,100)
self.go_button = Gtk.Button("Start")
self.go_button.connect("clicked", self.do_work_subclass)
self.layout.pack_start(self.go_button, False, False, 0)
self.add(self.layout)
self.show_all()
def on_destroy(widget, event):
Gtk.main_quit()
def do_work(self, widget):
def worker_thread():
so_far = 0
while so_far < 10:
time.sleep(0.5)
print("work so far: %s" % so_far)
Gdk.threads_enter()
try:
if so_far > 0:
self.progress.set_fraction(so_far / 10.0)
finally:
Gdk.threads_leave()
so_far += 1
threading.Thread(target=worker_thread).start()
if __name__ == "__main__":
app = App()
Gdk.threads_init()
Gdk.threads_enter()
Gtk.main()
Gdk.threads_leave()
这可能与我正在使用Gtk3有关吗?
在发布问题之前花了数小时试图找到答案,我在发布后几分钟找到了解决方案。 结果(从这里开始 )对于GTK3,您需要调用GLib.threads_init()
,该代码可以在调用GLib.threads_init()
,使用from gi.repository import GLib
和GLib.threads_init()
的GLib.threads_init()
进行Gtk.main()
该代码的工作版本如下所示:
from gi.repository import Gtk,Gdk, GLib
import threading
import time
class App(Gtk.Window):
def __init__(self):
super(App, self).__init__()
self.connect("destroy", self.on_destroy)
self.layout = Gtk.VBox()
self.progress = Gtk.ProgressBar()
self.layout.pack_start(self.progress, False, False, 0)
self.set_size_request(100,100)
self.go_button = Gtk.Button("Start")
self.go_button.connect("clicked", self.do_work)
self.layout.pack_start(self.go_button, False, False, 0)
self.add(self.layout)
self.show_all()
def on_destroy(widget, event):
Gtk.main_quit()
def do_work(self, widget):
def worker_thread():
so_far = 0
while so_far < 10:
time.sleep(0.5)
print("work so far: %s" % so_far)
Gdk.threads_enter()
try:
if so_far > 0:
self.progress.set_fraction(so_far / 10.0)
finally:
Gdk.threads_leave()
so_far += 1
threading.Thread(target=worker_thread).start()
if __name__ == "__main__":
app = App()
GLib.threads_init()
Gdk.threads_init()
Gdk.threads_enter()
Gtk.main()
Gdk.threads_leave()
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