Question

我运行了一个wxpython应用程序，我想知道当前一个应用程序继续运行时，是否可以通过按钮单击启动该应用程序的另一个实例？

类似于：启动wxpython应用程序 - ＆gt;点击按钮 - ＆gt;并且该事件会产生另一个进程（一个多进程进程），该进程在第一个应用程序继续运行时启动该应用程序的另一个实例？

我只是想知道它是否可行，因为当我在按钮点击事件处理中启动一个简单的过程时，比如

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

它抛出错误

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

我走的是正确的道路吗？

我在Windows 7上使用python 2.7和wx 3.0.2.0

Answer 1

Python multiprocessing使用pickle模块将信息传递给新进程。 pickle文档描述了what can be pickled and unpickled。使用self.new，您尝试传递一个无法进行pickle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

python：在wxbutton click上启动一个多处理过程

1 个答案: