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📁 ..
📄 __init__.py(399 B)
📄 __main__.py(68 B)
📁 __pycache__
📄 test_anon.py(2.48 KB)
📄 test_array_in_pointer.py(1.7 KB)
📄 test_arrays.py(7.33 KB)
📄 test_as_parameter.py(6.76 KB)
📄 test_bitfields.py(9.98 KB)
📄 test_buffers.py(2.55 KB)
📄 test_bytes.py(1.94 KB)
📄 test_byteswap.py(11.14 KB)
📄 test_callbacks.py(10.33 KB)
📄 test_cast.py(3.64 KB)
📄 test_cfuncs.py(7.5 KB)
📄 test_checkretval.py(968 B)
📄 test_delattr.py(533 B)
📄 test_errno.py(2.12 KB)
📄 test_find.py(4.33 KB)
📄 test_frombuffer.py(5.09 KB)
📄 test_funcptr.py(3.93 KB)
📄 test_functions.py(12.26 KB)
📄 test_incomplete.py(1023 B)
📄 test_init.py(1.01 KB)
📄 test_internals.py(2.57 KB)
📄 test_keeprefs.py(3.96 KB)
📄 test_libc.py(1005 B)
📄 test_loading.py(6.91 KB)
📄 test_macholib.py(2.07 KB)
📄 test_memfunctions.py(3.22 KB)
📄 test_numbers.py(9.3 KB)
📄 test_objects.py(1.64 KB)
📄 test_parameters.py(9.35 KB)
📄 test_pep3118.py(8.32 KB)
📄 test_pickling.py(2.17 KB)
📄 test_pointers.py(7.07 KB)
📄 test_prototypes.py(6.68 KB)
📄 test_python_api.py(2.8 KB)
📄 test_random_things.py(2.77 KB)
📄 test_refcounts.py(2.52 KB)
📄 test_repr.py(842 B)
📄 test_returnfuncptrs.py(2.83 KB)
📄 test_simplesubclasses.py(1.26 KB)
📄 test_sizes.py(804 B)
📄 test_slicing.py(5.88 KB)
📄 test_stringptr.py(2.48 KB)
📄 test_strings.py(7.13 KB)
📄 test_struct_fields.py(2.36 KB)
📄 test_structures.py(26.57 KB)
📄 test_unaligned_structures.py(1.11 KB)
📄 test_unicode.py(1.95 KB)
📄 test_values.py(3.78 KB)
📄 test_varsize_struct.py(1.8 KB)
📄 test_win32.py(4.91 KB)
📄 test_wintypes.py(1.36 KB)

Editing: test_objects.py

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

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)

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