Gecko [ sachasauda.akalacademy.ac.in ]

Name	Size	Permission
__pycache__	[ DIR ]	drwxr-xr-x
__init__.py	399 B	-rw-r--r--
__main__.py	68 B	-rw-r--r--
test_anon.py	2 KB	-rw-r--r--
test_array_in_pointer.py	1.7 KB	-rw-r--r--
test_arrays.py	5.64 KB	-rw-r--r--
test_as_parameter.py	6.61 KB	-rw-r--r--
test_bitfields.py	9.84 KB	-rw-r--r--
test_buffers.py	2.23 KB	-rw-r--r--
test_bytes.py	1.88 KB	-rw-r--r--
test_byteswap.py	11.14 KB	-rw-r--r--
test_callbacks.py	9.31 KB	-rw-r--r--
test_cast.py	3.11 KB	-rw-r--r--
test_cfuncs.py	7.5 KB	-rw-r--r--
test_checkretval.py	968 B	-rw-r--r--
test_delattr.py	533 B	-rw-r--r--
test_errno.py	2.25 KB	-rw-r--r--
test_find.py	2.1 KB	-rw-r--r--
test_frombuffer.py	4.59 KB	-rw-r--r--
test_funcptr.py	3.82 KB	-rw-r--r--
test_functions.py	12.26 KB	-rw-r--r--
test_incomplete.py	1023 B	-rw-r--r--
test_init.py	1.01 KB	-rw-r--r--
test_internals.py	2.57 KB	-rw-r--r--
test_keeprefs.py	3.96 KB	-rw-r--r--
test_libc.py	1005 B	-rw-r--r--
test_loading.py	4.52 KB	-rw-r--r--
test_macholib.py	1.79 KB	-rw-r--r--
test_memfunctions.py	3.22 KB	-rw-r--r--
test_numbers.py	9.07 KB	-rw-r--r--
test_objects.py	1.64 KB	-rw-r--r--
test_parameters.py	6.05 KB	-rw-r--r--
test_pep3118.py	7.65 KB	-rw-r--r--
test_pickling.py	2.17 KB	-rw-r--r--
test_pointers.py	6.95 KB	-rw-r--r--
test_prototypes.py	6.68 KB	-rw-r--r--
test_python_api.py	2.8 KB	-rw-r--r--
test_random_things.py	2.76 KB	-rw-r--r--
test_refcounts.py	2.52 KB	-rw-r--r--
test_repr.py	842 B	-rw-r--r--
test_returnfuncptrs.py	2.83 KB	-rw-r--r--
test_simplesubclasses.py	1.26 KB	-rw-r--r--
test_sizes.py	815 B	-rw-r--r--
test_slicing.py	5.88 KB	-rw-r--r--
test_stringptr.py	2.48 KB	-rw-r--r--
test_strings.py	6.97 KB	-rw-r--r--
test_struct_fields.py	1.47 KB	-rw-r--r--
test_structures.py	16.24 KB	-rw-r--r--
test_unaligned_structures.py	1.19 KB	-rw-r--r--
test_unicode.py	1.72 KB	-rw-r--r--
test_values.py	3.75 KB	-rw-r--r--
test_varsize_struct.py	1.8 KB	-rw-r--r--
test_win32.py	5.16 KB	-rw-r--r--
test_wintypes.py	1.43 KB	-rw-r--r--

Name

Size

Permission

Action

__pycache__

[ DIR ]

drwxr-xr-x

__init__.py

399 B

-rw-r--r--

__main__.py

68 B

-rw-r--r--

test_anon.py

2 KB

-rw-r--r--

test_array_in_pointer.py

1.7 KB

-rw-r--r--

test_arrays.py

5.64 KB

-rw-r--r--

test_as_parameter.py

6.61 KB

-rw-r--r--

test_bitfields.py

9.84 KB

-rw-r--r--

test_buffers.py

2.23 KB

-rw-r--r--

test_bytes.py

1.88 KB

-rw-r--r--

test_byteswap.py

11.14 KB

-rw-r--r--

test_callbacks.py

9.31 KB

-rw-r--r--

test_cast.py

3.11 KB

-rw-r--r--

test_cfuncs.py

7.5 KB

-rw-r--r--

test_checkretval.py

968 B

-rw-r--r--

test_delattr.py

533 B

-rw-r--r--

test_errno.py

2.25 KB

-rw-r--r--

test_find.py

2.1 KB

-rw-r--r--

test_frombuffer.py

4.59 KB

-rw-r--r--

test_funcptr.py

3.82 KB

-rw-r--r--

test_functions.py

12.26 KB

-rw-r--r--

test_incomplete.py

1023 B

-rw-r--r--

test_init.py

1.01 KB

-rw-r--r--

test_internals.py

2.57 KB

-rw-r--r--

test_keeprefs.py

3.96 KB

-rw-r--r--

test_libc.py

1005 B

-rw-r--r--

test_loading.py

4.52 KB

-rw-r--r--

test_macholib.py

1.79 KB

-rw-r--r--

test_memfunctions.py

3.22 KB

-rw-r--r--

test_numbers.py

9.07 KB

-rw-r--r--

test_objects.py

1.64 KB

-rw-r--r--

test_parameters.py

6.05 KB

-rw-r--r--

test_pep3118.py

7.65 KB

-rw-r--r--

test_pickling.py

2.17 KB

-rw-r--r--

test_pointers.py

6.95 KB

-rw-r--r--

test_prototypes.py

6.68 KB

-rw-r--r--

test_python_api.py

2.8 KB

-rw-r--r--

test_random_things.py

2.76 KB

-rw-r--r--

test_refcounts.py

2.52 KB

-rw-r--r--

test_repr.py

842 B

-rw-r--r--

test_returnfuncptrs.py

2.83 KB

-rw-r--r--

test_simplesubclasses.py

1.26 KB

-rw-r--r--

test_sizes.py

815 B

-rw-r--r--

test_slicing.py

5.88 KB

-rw-r--r--

test_stringptr.py

2.48 KB

-rw-r--r--

test_strings.py

6.97 KB

-rw-r--r--

test_struct_fields.py

1.47 KB

-rw-r--r--

test_structures.py

16.24 KB

-rw-r--r--

test_unaligned_structures.py

1.19 KB

-rw-r--r--

test_unicode.py

1.72 KB

-rw-r--r--

test_values.py

3.75 KB

-rw-r--r--

test_varsize_struct.py

1.8 KB

-rw-r--r--

test_win32.py

5.16 KB

-rw-r--r--

test_wintypes.py

1.43 KB

-rw-r--r--

Code Editor : 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, 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)

${this.title}

Code Editor : test_objects.py