Question

我目前正在尝试创建一个python脚本，该脚本必须使用GObject.MainLoop（）与蓝牙客户端进行通信。我把循环放在一个新的线程中，以便不阻止剩余的代码。

在我尝试使用Control + C退出程序之前，一切正常。如果我点击此命令，第二次尝试和捕获块（＆＃34;主机：......＆＃34;）似乎没有被执行。

示例脚本：

import time
import threading

from dbus.mainloop.glib import DBusGMainLoop

try:
    from gi.repository import GObject
except ImportError:
    import gobject as GObject

DBusGMainLoop(set_as_default=True)

def myThread(a):
    try:
        GObject.threads_init()
        mainloop = GObject.MainLoop()
        mainloop.run()

    except KeyboardInterrupt:
        mainloop.quit()
        print("Thread: KeyboardInterrupt")
    return

try:
    myT = threading.Thread(target=myThread, args=(1,))
    myT.start()

    while 1:
        print("Host: Print every 1 sec")
        time.sleep(1)
except KeyboardInterrupt:
    print("Host: KeyboardInterrupt")

脚本输出：

Host: Print every 1 sec
Host: Print every 1 sec
^CHost: Print every 1 sec
Thread: KeyboardInterrupt
/usr/lib/python2.7/dist-packages/gi/types.py:113: Warning: Source ID 1 was not found when attempting to remove it
  return info.invoke(*args, **kwargs)
Host: Print every 1 sec
Host: Print every 1 sec
Host: Print every 1 sec
Host: Print every 1 sec

Process finished with exit code -1

现在我想知道为什么＆＃34;打印（＆＃34;主机：KeyboardInterrupt＆＃34;）＆＃34;没有被执行。此外，我不确定如何解决上述警告。

希望你能帮忙！

Answer 1

事实上，我能够自己解决问题。

您只需将MainLoop（）置于主线程中，然后启动另一个当前在新线程（myT）中执行“print（”Host：Print every every 1“）”的操作。所以你必须从上面的代码中改变线程。然后，如果发生KeyboardInterrupt，则必须手动退出第二个线程（myT）。

仅调用“print（”Thread：KeyboardInterrupt“）”的原因是，如果使用MainLoop，则调用它的过程将被视为“新的主要步骤”。

但是，我仍然不确定如何摆脱错误：

(process:2429): GLib-CRITICAL **: Source ID 1 was not found when attempting to remove it

根据帖子“GLib-CRITICAL **: Source ID XXX was not found when attempting to remove it”，警告不是问题，所以我会忽略它。希望这有助于任何能够绊倒这篇文章的人！

示例：

import time import threading from dbus.mainloop.glib import DBusGMainLoop try: from gi.repository import GObject except ImportError: import gobject as GObject DBusGMainLoop(set_as_default=True) def myThread(run_event): while run_event.is_set(): print("Thread: Print every 1 sec") time.sleep(1) print("Thread: Exit") return try: run_event = threading.Event() run_event.set() myT = threading.Thread(target=myThread, args=(run_event,)) myT.start() GObject.threads_init() mainloop = GObject.MainLoop() mainloop.run() except (KeyboardInterrupt, SystemExit): mainloop.quit() run_event.clear() myT.join() print("Host: KeyboardInterrupt")

<强>输出：

Thread: Print every 1 sec Thread: Print every 1 sec ^CThread: Exit Host: KeyboardInterrupt (process:2429): GLib-CRITICAL **: Source ID 1 was not found when attempting to remove it

另见： Closing all threads with a keyboard interrupt

Python DBusGMainLoop内部线程和try和catch块

1 个答案: