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Name	Size	Permission	Date
__pycache__	[ DIR ]	drwxr-sr-x	2025-06-04 09:23
__init__.py	445 B	-rw-r--r--	2025-06-04 09:23
__main__.py	68 B	-rw-r--r--	2025-06-04 09:23
test_anon.py	2.48 KB	-rw-r--r--	2025-06-04 09:23
test_array_in_pointer.py	1.7 KB	-rw-r--r--	2025-06-04 09:23
test_arrays.py	7.33 KB	-rw-r--r--	2025-06-04 09:23
test_as_parameter.py	6.76 KB	-rw-r--r--	2025-06-04 09:23
test_bitfields.py	10.11 KB	-rw-r--r--	2025-06-04 09:23
test_buffers.py	2.55 KB	-rw-r--r--	2025-06-04 09:23
test_bytes.py	1.94 KB	-rw-r--r--	2025-06-04 09:23
test_byteswap.py	11.14 KB	-rw-r--r--	2025-06-04 09:23
test_callbacks.py	10.33 KB	-rw-r--r--	2025-06-04 09:23
test_cast.py	3.64 KB	-rw-r--r--	2025-06-04 09:23
test_cfuncs.py	7.5 KB	-rw-r--r--	2025-06-04 09:23
test_checkretval.py	968 B	-rw-r--r--	2025-06-04 09:23
test_delattr.py	533 B	-rw-r--r--	2025-06-04 09:23
test_errno.py	2.12 KB	-rw-r--r--	2025-06-04 09:23
test_find.py	4.36 KB	-rw-r--r--	2025-06-04 09:23
test_frombuffer.py	5.09 KB	-rw-r--r--	2025-06-04 09:23
test_funcptr.py	3.93 KB	-rw-r--r--	2025-06-04 09:23
test_functions.py	12.21 KB	-rw-r--r--	2025-06-04 09:23
test_incomplete.py	1023 B	-rw-r--r--	2025-06-04 09:23
test_init.py	1.01 KB	-rw-r--r--	2025-06-04 09:23
test_internals.py	2.57 KB	-rw-r--r--	2025-06-04 09:23
test_keeprefs.py	3.96 KB	-rw-r--r--	2025-06-04 09:23
test_libc.py	1005 B	-rw-r--r--	2025-06-04 09:23
test_loading.py	6.97 KB	-rw-r--r--	2025-06-04 09:23
test_macholib.py	2.07 KB	-rw-r--r--	2025-06-04 09:23
test_memfunctions.py	3.22 KB	-rw-r--r--	2025-06-04 09:23
test_numbers.py	9.25 KB	-rw-r--r--	2025-06-04 09:23
test_objects.py	1.64 KB	-rw-r--r--	2025-06-04 09:23
test_parameters.py	10.83 KB	-rw-r--r--	2025-06-04 09:23
test_pep3118.py	8.48 KB	-rw-r--r--	2025-06-04 09:23
test_pickling.py	2.17 KB	-rw-r--r--	2025-06-04 09:23
test_pointers.py	7.07 KB	-rw-r--r--	2025-06-04 09:23
test_prototypes.py	6.68 KB	-rw-r--r--	2025-06-04 09:23
test_python_api.py	2.7 KB	-rw-r--r--	2025-06-04 09:23
test_random_things.py	2.77 KB	-rw-r--r--	2025-06-04 09:23
test_refcounts.py	3.06 KB	-rw-r--r--	2025-06-04 09:23
test_repr.py	842 B	-rw-r--r--	2025-06-04 09:23
test_returnfuncptrs.py	2.83 KB	-rw-r--r--	2025-06-04 09:23
test_simplesubclasses.py	1.26 KB	-rw-r--r--	2025-06-04 09:23
test_sizes.py	804 B	-rw-r--r--	2025-06-04 09:23
test_slicing.py	5.88 KB	-rw-r--r--	2025-06-04 09:23
test_stringptr.py	2.54 KB	-rw-r--r--	2025-06-04 09:23
test_strings.py	7.13 KB	-rw-r--r--	2025-06-04 09:23
test_struct_fields.py	2.92 KB	-rw-r--r--	2025-06-04 09:23
test_structures.py	26.77 KB	-rw-r--r--	2025-06-04 09:23
test_unaligned_structures.py	1.11 KB	-rw-r--r--	2025-06-04 09:23
test_unicode.py	1.95 KB	-rw-r--r--	2025-06-04 09:23
test_values.py	3.78 KB	-rw-r--r--	2025-06-04 09:23
test_varsize_struct.py	1.8 KB	-rw-r--r--	2025-06-04 09:23
test_win32.py	4.91 KB	-rw-r--r--	2025-06-04 09:23
test_wintypes.py	1.36 KB	-rw-r--r--	2025-06-04 09:23

Rename

import unittest
from test import support
from ctypes import *

import _ctypes_test

lib = CDLL(_ctypes_test.__file__)

class StringPtrTestCase(unittest.TestCase):

@support.refcount_test
    def test__POINTER_c_char(self):
        class X(Structure):
            _fields_ = [("str", POINTER(c_char))]
        x = X()

# NULL pointer access
        self.assertRaises(ValueError, getattr, x.str, "contents")
        b = c_buffer(b"Hello, World")
        from sys import getrefcount as grc
        self.assertEqual(grc(b), 2)
        x.str = b
        self.assertEqual(grc(b), 3)

# POINTER(c_char) and Python string is NOT compatible
        # POINTER(c_char) and c_buffer() is compatible
        for i in range(len(b)):
            self.assertEqual(b[i], x.str[i])

self.assertRaises(TypeError, setattr, x, "str", "Hello, World")

def test__c_char_p(self):
        class X(Structure):
            _fields_ = [("str", c_char_p)]
        x = X()

# c_char_p and Python string is compatible
        # c_char_p and c_buffer is NOT compatible
        self.assertEqual(x.str, None)
        x.str = b"Hello, World"
        self.assertEqual(x.str, b"Hello, World")
        b = c_buffer(b"Hello, World")
        self.assertRaises(TypeError, setattr, x, b"str", b)

def test_functions(self):
        strchr = lib.my_strchr
        strchr.restype = c_char_p

# c_char_p and Python string is compatible
        # c_char_p and c_buffer are now compatible
        strchr.argtypes = c_char_p, c_char
        self.assertEqual(strchr(b"abcdef", b"c"), b"cdef")
        self.assertEqual(strchr(c_buffer(b"abcdef"), b"c"), b"cdef")

# POINTER(c_char) and Python string is NOT compatible
        # POINTER(c_char) and c_buffer() is compatible
        strchr.argtypes = POINTER(c_char), c_char
        buf = c_buffer(b"abcdef")
        self.assertEqual(strchr(buf, b"c"), b"cdef")
        self.assertEqual(strchr(b"abcdef", b"c"), b"cdef")

# XXX These calls are dangerous, because the first argument
        # to strchr is no longer valid after the function returns!
        # So we must keep a reference to buf separately

strchr.restype = POINTER(c_char)
        buf = c_buffer(b"abcdef")
        r = strchr(buf, b"c")
        x = r[0], r[1], r[2], r[3], r[4]
        self.assertEqual(x, (b"c", b"d", b"e", b"f", b"\000"))
        del buf
        # Because r is a pointer to memory that is freed after deleting buf,
        # the pointer is hanging and using it would reference freed memory.

if __name__ == '__main__':
    unittest.main()