python：在wxbutton上单击以启动一个多处理过程

Question

我有一个运行的wxpython应用程序，我想知道是否可以在以前的应用程序继续运行时通过单击按钮来启动该应用程序的另一个实例？

像这样：启动一个wxpython应用程序->单击一个按钮->然后该事件产生另一个进程（一个多处理进程），该进程启动同一应用程序的另一个实例，而第一个实例继续运行？

我只是想知道这是否可行，因为当我在按钮单击事件处理中启动一个简单的过程时，例如

def start_new_button(self,event):
    import multiprocessing
    worker2 = multiprocessing.Process(name = 'worker2', target = self.new)
    worker2.start()
def new():
    pass

它引发错误

Traceback (most recent call last):
  File "main.py", line 470, in start_new_button
    worker2.start()
  File "C:\Python27\lib\multiprocessing\process.py", line 130, in start
    self._popen = Popen(self)
  File "C:\Python27\lib\multiprocessing\forking.py", line 277, in __init__
    dump(process_obj, to_child, HIGHEST_PROTOCOL)
  File "C:\Python27\lib\multiprocessing\forking.py", line 199, 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 67, 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 __bu
iltin__.PySwigObject
C:\Python27\lib\site-packages\mpltools\style\__init__.py:42: FutureWarning:

    The style-sheet functionality in mpltools has been integrated into
    Matplotlib >= 1.4. This module will be removed in a future release.

    Note that style-sheets used by `matplotlib.style` use the standard
    Matplotlib rc-file syntax instead of the INI format used by `mpltools`.
    This mostly means un-quoting strings and changing '=' to ':'.


  """, FutureWarning)
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "C:\Python27\lib\multiprocessing\forking.py", line 381, in main
    self = load(from_parent)
  File "C:\Python27\lib\pickle.py", line 1378, in load
    return Unpickler(file).load()
  File "C:\Python27\lib\pickle.py", line 858, in load
    dispatch[key](self)
  File "C:\Python27\lib\pickle.py", line 880, in load_eof
    raise EOFError
EOFError

我走的路正确吗？

IAM在Windows 7上将Python 2.7与WX 3.0.2.0结合使用

Answer 1

Python multiprocessing使用pickle模块将信息传递给新进程。 pickle文档中描述了可以腌制和不腌制的内容 。 使用self.new您试图传递无法腌制的实例方法。

尝试将非实例方法传递给multiprocessing.Process() ：

class YourButtonClass:
    def start_new_button(self,event):
        import multiprocessing
        worker2 = multiprocessing.Process(name = 'worker2', target = new)
        worker2.start()

def new():
    pass