如何实时监控子进程

Question

我是python的新手。

我目前正在做一个项目。

通过单击按钮A，命令"adb shell getevent“将在一个子进程中执行。结果将写入一个文件。如果有人点击所连接的设备，则会不时产生结果。

单击按钮B即可停止该操作。

class MyClass():
...
    def recordCmd(self):
        cmd = []
        cmd.append("adb")
        cmd.append("shell")
        cmd.append("getevent")
        cmd.append("/dev/input/event0")
        p = subprocess.Popen(cmd, stdin=PIPE, stdout=PIPE)
        for line in p.stdout:
            print line

    def OnRecordEvent(self, event):
    '''
     call "adb shell getevent /dev/input/event0 " to collect events
     '''
    mp = multiprocessing.Process(target=self.recordCmd, args=(self,))
    mp.daemon= True
    mp.start()
....

这不起作用，会抛出以下错误：

File "C:\Python27\lib\multiprocessing\forking.py", line 271, in __init__
dump(process_obj, to_child, HIGHEST_PROTOCOL)
File "C:\Python27\lib\multiprocessing\forking.py", line 193, in dump
ForkingPickler(file, protocol).dump(obj)
File "C:\Python27\lib\pickle.py", line 224, in dump
self.save(obj)
File "C:\Python27\lib\pickle.py", line 331, in save
self.save_reduce(obj=obj, *rv)
File "C:\Python27\lib\pickle.py", line 419, in save_reduce
save(state)
File "C:\Python27\lib\pickle.py", line 286, in save
f(self, obj) # Call unbound method with explicit self
File "C:\Python27\lib\pickle.py", line 649, in save_dict
self._batch_setitems(obj.iteritems())
File "C:\Python27\lib\pickle.py", line 681, in _batch_setitems
save(v)
File "C:\Python27\lib\pickle.py", line 286, in save
f(self, obj) # Call unbound method with explicit self
File "C:\Python27\lib\multiprocessing\forking.py", line 66, in dispatcher
self.save_reduce(obj=obj, *rv)
File "C:\Python27\lib\pickle.py", line 401, in save_reduce
save(args)
File "C:\Python27\lib\pickle.py", line 286, in save
f(self, obj) # Call unbound method with explicit self
File "C:\Python27\lib\pickle.py", line 548, in save_tuple
save(element)
File "C:\Python27\lib\pickle.py", line 331, in save
self.save_reduce(obj=obj, *rv)
File "C:\Python27\lib\pickle.py", line 419, in save_reduce
save(state)
File "C:\Python27\lib\pickle.py", line 286, in save
f(self, obj) # Call unbound method with explicit self
File "C:\Python27\lib\pickle.py", line 649, in save_dict
self._batch_setitems(obj.iteritems())
File "C:\Python27\lib\pickle.py", line 681, in _batch_setitems
save(v)
File "C:\Python27\lib\pickle.py", line 331, in save
self.save_reduce(obj=obj, *rv)
File "C:\Python27\lib\pickle.py", line 419, in save_reduce
save(state)
File "C:\Python27\lib\pickle.py", line 286, in save
f(self, obj) # Call unbound method with explicit self
File "C:\Python27\lib\pickle.py", line 649, in save_dict
self._batch_setitems(obj.iteritems())
File "C:\Python27\lib\pickle.py", line 686, in _batch_setitems
save(v)
File "C:\Python27\lib\pickle.py", line 331, in save
self.save_reduce(obj=obj, *rv)
File "C:\Python27\lib\pickle.py", line 396, in save_reduce
save(cls)
File "C:\Python27\lib\pickle.py", line 286, in save
f(self, obj) # Call unbound method with explicit self
File "C:\Python27\lib\pickle.py", line 748, in save_global
(obj, module, name))
pickle.PicklingError: Can't pickle <type 'PySwigObject'>: it's not found as __builtin__.PySwigObject

有人能在这方面帮我吗？

Answer 1

在进程之间复制对象时，multiprocessing使用pickle。该错误消息似乎表明MyClass包含无法酸洗的内容。

您可以将recordCmd函数从类中删除，因为它无论如何都不会引用self。