python：在wxbutton上單擊以啟動一個多處理過程

Question

我有一個運行的wxpython應用程序，我想知道是否可以在以前的應用程序繼續運行時通過單擊按鈕來啟動該應用程序的另一個實例？

像這樣：啟動一個wxpython應用程序->單擊一個按鈕->然后該事件產生另一個進程（一個多處理進程），該進程啟動同一應用程序的另一個實例，而第一個實例繼續運行？

我只是想知道這是否可行，因為當我在按鈕單擊事件處理中啟動一個簡單的過程時，例如

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

它引發錯誤

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

我走的路正確嗎？

IAM在Windows 7上將Python 2.7與WX 3.0.2.0結合使用

Answer 1

Python multiprocessing使用pickle模塊將信息傳遞給新進程。 pickle文檔中描述了可以腌制和不腌制的內容 。 使用self.new您試圖傳遞無法腌制的實例方法。

嘗試將非實例方法傳遞給multiprocessing.Process() ：

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

def new():
    pass