All,
While trying to write game state, I found that objects containing
pyglet sprites, etc would not pickle due to embedded ctypes. For
example:
>>> import pyglet
>>> image = pyglet.resource.image('star.png')
>>> import pickle
>>> pickle.dumps(image)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/
lib/python2.7/pickle.py", line 1374, in dumps
Pickler(file, protocol).dump(obj)
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/
lib/python2.7/pickle.py", line 224, in dump
self.save(obj)
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/
lib/python2.7/pickle.py", line 331, in save
self.save_reduce(obj=obj, *rv)
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/
lib/python2.7/pickle.py", line 419, in save_reduce
save(state)
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/
lib/python2.7/pickle.py", line 286, in save
f(self, obj) # Call unbound method with explicit self
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/
lib/python2.7/pickle.py", line 649, in save_dict
self._batch_setitems(obj.iteritems())
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/
lib/python2.7/pickle.py", line 663, in _batch_setitems
save(v)
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/
lib/python2.7/pickle.py", line 331, in save
self.save_reduce(obj=obj, *rv)
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/
lib/python2.7/pickle.py", line 419, in save_reduce
save(state)
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/
lib/python2.7/pickle.py", line 286, in save
f(self, obj) # Call unbound method with explicit self
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/
lib/python2.7/pickle.py", line 649, in save_dict
self._batch_setitems(obj.iteritems())
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/
lib/python2.7/pickle.py", line 663, in _batch_setitems
save(v)
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/
lib/python2.7/pickle.py", line 306, in save
rv = reduce(self.proto)
ValueError: ctypes objects containing pointers cannot be pickled
I have worked around this by manually excluding/reconstituting pyglet
images and sprites from my objects using __getstate__ and
__setstate__. The downside for me is the extra work/code that is
required. Are there any plans to make pyglet objects amenable to
pickling?
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