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Python DBusGMainLoop在线程内部并尝试捕获块

[英]Python DBusGMainLoop inside thread and try and catch block

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。 我将循环放入新线程中,以便不阻塞其余代码。

在尝试使用Control + C退出程序之前,一切正常。如果我按此命令,第二个try and catch块(“ Host:...”)似乎没有执行。

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")

脚本的输出:

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“ print(“ Host:KeyboardInterrupt”)“没有得到执行。 此外,我不确定如何解决上述警告。

希望能对您有所帮助!

实际上,我能够自己解决问题。

您只需要在主线程中放入MainLoop()并启动当前在新线程(myT)中执行“ print(“主机:每1秒打印一次”)“的其他操作。 因此,您必须从上面的代码更改线程。 然后,如果发生KeyboardInterrupt,则必须手动退出第二个线程(myT)。

之所以只调用“ print(“ Thread:KeyboardInterrupt”)“,是因为,如果您使用MainLoop,则调用该过程的进程将被视为“新的主踏板”。

但是,我仍然不确定如何消除该错误:

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

根据帖子“ GLib-CRITICAL **:尝试删除它时未找到源ID XXX ”,该警告不是问题,因此我将忽略它。 希望这对任何会迷失这篇文章的人有所帮助!

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")

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

另请参阅: 通过键盘中断关闭所有线程

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