将 kivy 小部件保存到文件

Saving a kivy widget to a file(将 kivy 小部件保存到文件)

问题描述

所以我尝试使用 cpickle 将 kivy 小部件保存到文件中，但出现错误.

So I'm trying to save a kivy widget to a file using cpickle and I get an error.

from kivy.uix.widget import Widget
import cPickle as pickle

foo = Widget()
bar = open('bar.dat', 'w')
pickle.dump(foo, bar)
bar.close()

提供 Traceback 之类的，

Gives Traceback like,

Traceback (most recent call last):
  File ".last_tmp.py", line 6, in <module>
    pickle.dump(foo, bar)
  File "QPython/build/python-install/lib/python2.7/copy_reg.py", line 71, in_reduce_ex
TypeError: __init__() takes exactly 0 positional arguments(1 given)

有没有办法解决这个问题?还是有更好的方法将小部件保存到文件中以供以后使用?

Is there a way to fix this? Or is there a better way to save a widget to a file for later use?

推荐答案

貌似使用更高的协议 可能会有所帮助:

Looks like using higher protocol may help:

#!/usr/bin/python
# -*- coding: utf-8 -*-

try:
    import cPickle as pickle
except:
    import pickle

from kivy.uix.widget import Widget

w = Widget()
w.test = 5
data_string = pickle.dumps(w, protocol=pickle.HIGHEST_PROTOCOL)

x = pickle.loads(data_string)
print x.test

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