1#@!#!123s

: / opt / python35 / lib / python3.5 / ctypes / test /

Filename : test_objects.py

back

r'''
This tests the '_objects' attribute of ctypes instances.  '_objects'
holds references to objects that must be kept alive as long as the
ctypes instance, to make sure that the memory buffer is valid.

WARNING: The '_objects' attribute is exposed ONLY for debugging ctypes itself,
it MUST NEVER BE MODIFIED!

'_objects' is initialized to a dictionary on first use, before that it
is None.

Here is an array of string pointers:

>>> from ctypes import *
>>> array = (c_char_p * 5)()
>>> print(array._objects)
None
>>>

The memory block stores pointers to strings, and the strings itself
assigned from Python must be kept.

>>> array[4] = b'foo bar'
>>> array._objects
{'4': b'foo bar'}
>>> array[4]
b'foo bar'
>>>

It gets more complicated when the ctypes instance itself is contained
in a 'base' object.

>>> class X(Structure):
...     _fields_ = [("x", c_int), ("y", c_int), ("array", c_char_p * 5)]
...
>>> x = X()
>>> print(x._objects)
None
>>>

The'array' attribute of the 'x' object shares part of the memory buffer
of 'x' ('_b_base_' is either None, or the root object owning the memory block):

>>> print(x.array._b_base_) # doctest: +ELLIPSIS
<ctypes.test.test_objects.X object at 0x...>
>>>

>>> x.array[0] = b'spam spam spam'
>>> x._objects
{'0:2': b'spam spam spam'}
>>> x.array._b_base_._objects
{'0:2': b'spam spam spam'}
>>>

'''

import unittest, doctest, sys

import ctypes.test.test_objects

class TestCase(unittest.TestCase):
    def test(self):
        failures, tests = doctest.testmod(ctypes.test.test_objects)
        self.assertFalse(failures, 'doctests failed, see output above')

if __name__ == '__main__':
    doctest.testmod(ctypes.test.test_objects)

Name	Size	Last Modified	Owner	Permissions
__pycache__	Dir	December 28 2023 9:19:26	root	0755
__init__.py	0.39 KB	December 28 2023 9:16:57	root	0755
__main__.py	0.066 KB	December 28 2023 9:16:57	root	0755
test_anon.py	2.003 KB	December 28 2023 9:16:54	root	0755
test_array_in_pointer.py	1.697 KB	December 28 2023 9:16:55	root	0755
test_arrays.py	5.645 KB	December 28 2023 9:16:54	root	0755
test_as_parameter.py	6.613 KB	December 28 2023 9:16:55	root	0755
test_bitfields.py	9.844 KB	December 28 2023 9:16:55	root	0755
test_buffers.py	2.23 KB	December 28 2023 9:16:55	root	0755
test_bytes.py	1.879 KB	December 28 2023 9:16:56	root	0755
test_byteswap.py	11.144 KB	December 28 2023 9:16:56	root	0755
test_callbacks.py	9.313 KB	December 28 2023 9:16:55	root	0755
test_cast.py	3.113 KB	December 28 2023 9:16:55	root	0755
test_cfuncs.py	7.5 KB	December 28 2023 9:16:55	root	0755
test_checkretval.py	0.945 KB	December 28 2023 9:16:56	root	0755
test_delattr.py	0.521 KB	December 28 2023 9:16:55	root	0755
test_errno.py	2.248 KB	December 28 2023 9:16:55	root	0755
test_find.py	2.099 KB	December 28 2023 9:16:55	root	0755
test_frombuffer.py	4.594 KB	December 28 2023 9:16:55	root	0755
test_funcptr.py	3.819 KB	December 28 2023 9:16:56	root	0755
test_functions.py	12.261 KB	December 28 2023 9:16:56	root	0755
test_incomplete.py	0.999 KB	December 28 2023 9:16:56	root	0755
test_init.py	1.015 KB	December 28 2023 9:16:56	root	0755
test_internals.py	2.569 KB	December 28 2023 9:16:56	root	0755
test_keeprefs.py	3.963 KB	December 28 2023 9:16:56	root	0755
test_libc.py	0.981 KB	December 28 2023 9:16:56	root	0755
test_loading.py	4.522 KB	December 28 2023 9:16:56	root	0755
test_macholib.py	1.787 KB	December 28 2023 9:16:56	root	0755
test_memfunctions.py	3.216 KB	December 28 2023 9:16:56	root	0755
test_numbers.py	9.074 KB	December 28 2023 9:16:56	root	0755
test_objects.py	1.643 KB	December 28 2023 9:16:56	root	0755
test_parameters.py	6.051 KB	December 28 2023 9:16:56	root	0755
test_pep3118.py	7.651 KB	December 28 2023 9:16:56	root	0755
test_pickling.py	2.166 KB	December 28 2023 9:16:56	root	0755
test_pointers.py	6.945 KB	December 28 2023 9:16:56	root	0755
test_prototypes.py	6.685 KB	December 28 2023 9:16:56	root	0755
test_python_api.py	2.799 KB	December 28 2023 9:16:56	root	0755
test_random_things.py	2.761 KB	December 28 2023 9:16:57	root	0755
test_refcounts.py	2.516 KB	December 28 2023 9:16:57	root	0755
test_repr.py	0.822 KB	December 28 2023 9:16:57	root	0755
test_returnfuncptrs.py	2.835 KB	December 28 2023 9:16:57	root	0755
test_simplesubclasses.py	1.259 KB	December 28 2023 9:16:57	root	0755
test_sizes.py	0.796 KB	December 28 2023 9:16:57	root	0755
test_slicing.py	5.884 KB	December 28 2023 9:16:57	root	0755
test_stringptr.py	2.477 KB	December 28 2023 9:16:57	root	0755
test_strings.py	6.968 KB	December 28 2023 9:16:57	root	0755
test_struct_fields.py	1.468 KB	December 28 2023 9:16:57	root	0755
test_structures.py	16.243 KB	December 28 2023 9:16:57	root	0755
test_unaligned_structures.py	1.187 KB	December 28 2023 9:16:57	root	0755
test_unicode.py	1.72 KB	December 28 2023 9:16:57	root	0755
test_values.py	3.751 KB	December 28 2023 9:16:57	root	0755
test_varsize_struct.py	1.799 KB	December 28 2023 9:16:57	root	0755
test_win32.py	5.163 KB	December 28 2023 9:16:57	root	0755
test_wintypes.py	1.432 KB	December 28 2023 9:16:57	root	0755

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