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✏️ test_structures.py

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import unittest
from ctypes import *
from ctypes.test import need_symbol
from struct import calcsize
import _testcapi
import _ctypes_test

class SubclassesTest(unittest.TestCase):
    def test_subclass(self):
        class X(Structure):
            _fields_ = [("a", c_int)]

class Y(X):
            _fields_ = [("b", c_int)]

class Z(X):
            pass

self.assertEqual(sizeof(X), sizeof(c_int))
        self.assertEqual(sizeof(Y), sizeof(c_int)*2)
        self.assertEqual(sizeof(Z), sizeof(c_int))
        self.assertEqual(X._fields_, [("a", c_int)])
        self.assertEqual(Y._fields_, [("b", c_int)])
        self.assertEqual(Z._fields_, [("a", c_int)])

def test_subclass_delayed(self):
        class X(Structure):
            pass
        self.assertEqual(sizeof(X), 0)
        X._fields_ = [("a", c_int)]

class Y(X):
            pass
        self.assertEqual(sizeof(Y), sizeof(X))
        Y._fields_ = [("b", c_int)]

class Z(X):
            pass

class StructureTestCase(unittest.TestCase):
    formats = {"c": c_char,
               "b": c_byte,
               "B": c_ubyte,
               "h": c_short,
               "H": c_ushort,
               "i": c_int,
               "I": c_uint,
               "l": c_long,
               "L": c_ulong,
               "q": c_longlong,
               "Q": c_ulonglong,
               "f": c_float,
               "d": c_double,
               }

def test_simple_structs(self):
        for code, tp in self.formats.items():
            class X(Structure):
                _fields_ = [("x", c_char),
                            ("y", tp)]
            self.assertEqual((sizeof(X), code),
                                 (calcsize("c%c0%c" % (code, code)), code))

def test_unions(self):
        for code, tp in self.formats.items():
            class X(Union):
                _fields_ = [("x", c_char),
                            ("y", tp)]
            self.assertEqual((sizeof(X), code),
                                 (calcsize("%c" % (code)), code))

def test_struct_alignment(self):
        class X(Structure):
            _fields_ = [("x", c_char * 3)]
        self.assertEqual(alignment(X), calcsize("s"))
        self.assertEqual(sizeof(X), calcsize("3s"))

class Y(Structure):
            _fields_ = [("x", c_char * 3),
                        ("y", c_int)]
        self.assertEqual(alignment(Y), alignment(c_int))
        self.assertEqual(sizeof(Y), calcsize("3si"))

class SI(Structure):
            _fields_ = [("a", X),
                        ("b", Y)]
        self.assertEqual(alignment(SI), max(alignment(Y), alignment(X)))
        self.assertEqual(sizeof(SI), calcsize("3s0i 3si 0i"))

class IS(Structure):
            _fields_ = [("b", Y),
                        ("a", X)]

self.assertEqual(alignment(SI), max(alignment(X), alignment(Y)))
        self.assertEqual(sizeof(IS), calcsize("3si 3s 0i"))

class XX(Structure):
            _fields_ = [("a", X),
                        ("b", X)]
        self.assertEqual(alignment(XX), alignment(X))
        self.assertEqual(sizeof(XX), calcsize("3s 3s 0s"))

def test_empty(self):
        # I had problems with these
        #
        # Although these are pathological cases: Empty Structures!
        class X(Structure):
            _fields_ = []

class Y(Union):
            _fields_ = []

# Is this really the correct alignment, or should it be 0?
        self.assertTrue(alignment(X) == alignment(Y) == 1)
        self.assertTrue(sizeof(X) == sizeof(Y) == 0)

class XX(Structure):
            _fields_ = [("a", X),
                        ("b", X)]

self.assertEqual(alignment(XX), 1)
        self.assertEqual(sizeof(XX), 0)

def test_fields(self):
        # test the offset and size attributes of Structure/Unoin fields.
        class X(Structure):
            _fields_ = [("x", c_int),
                        ("y", c_char)]

self.assertEqual(X.x.offset, 0)
        self.assertEqual(X.x.size, sizeof(c_int))

self.assertEqual(X.y.offset, sizeof(c_int))
        self.assertEqual(X.y.size, sizeof(c_char))

# readonly
        self.assertRaises((TypeError, AttributeError), setattr, X.x, "offset", 92)
        self.assertRaises((TypeError, AttributeError), setattr, X.x, "size", 92)

class X(Union):
            _fields_ = [("x", c_int),
                        ("y", c_char)]

self.assertEqual(X.x.offset, 0)
        self.assertEqual(X.x.size, sizeof(c_int))

self.assertEqual(X.y.offset, 0)
        self.assertEqual(X.y.size, sizeof(c_char))

# readonly
        self.assertRaises((TypeError, AttributeError), setattr, X.x, "offset", 92)
        self.assertRaises((TypeError, AttributeError), setattr, X.x, "size", 92)

# XXX Should we check nested data types also?
        # offset is always relative to the class...

def test_packed(self):
        class X(Structure):
            _fields_ = [("a", c_byte),
                        ("b", c_longlong)]
            _pack_ = 1

self.assertEqual(sizeof(X), 9)
        self.assertEqual(X.b.offset, 1)

class X(Structure):
            _fields_ = [("a", c_byte),
                        ("b", c_longlong)]
            _pack_ = 2
        self.assertEqual(sizeof(X), 10)
        self.assertEqual(X.b.offset, 2)

import struct
        longlong_size = struct.calcsize("q")
        longlong_align = struct.calcsize("bq") - longlong_size

class X(Structure):
            _fields_ = [("a", c_byte),
                        ("b", c_longlong)]
            _pack_ = 4
        self.assertEqual(sizeof(X), min(4, longlong_align) + longlong_size)
        self.assertEqual(X.b.offset, min(4, longlong_align))

class X(Structure):
            _fields_ = [("a", c_byte),
                        ("b", c_longlong)]
            _pack_ = 8

self.assertEqual(sizeof(X), min(8, longlong_align) + longlong_size)
        self.assertEqual(X.b.offset, min(8, longlong_align))

d = {"_fields_": [("a", "b"),
                          ("b", "q")],
             "_pack_": -1}
        self.assertRaises(ValueError, type(Structure), "X", (Structure,), d)

# Issue 15989
        d = {"_fields_": [("a", c_byte)],
             "_pack_": _testcapi.INT_MAX + 1}
        self.assertRaises(ValueError, type(Structure), "X", (Structure,), d)
        d = {"_fields_": [("a", c_byte)],
             "_pack_": _testcapi.UINT_MAX + 2}
        self.assertRaises(ValueError, type(Structure), "X", (Structure,), d)

def test_initializers(self):
        class Person(Structure):
            _fields_ = [("name", c_char*6),
                        ("age", c_int)]

self.assertRaises(TypeError, Person, 42)
        self.assertRaises(ValueError, Person, "asldkjaslkdjaslkdj")
        self.assertRaises(TypeError, Person, "Name", "HI")

# short enough
        self.assertEqual(Person("12345", 5).name, "12345")
        # exact fit
        self.assertEqual(Person("123456", 5).name, "123456")
        # too long
        self.assertRaises(ValueError, Person, "1234567", 5)

def test_conflicting_initializers(self):
        class POINT(Structure):
            _fields_ = [("x", c_int), ("y", c_int)]
        # conflicting positional and keyword args
        self.assertRaises(TypeError, POINT, 2, 3, x=4)
        self.assertRaises(TypeError, POINT, 2, 3, y=4)

# too many initializers
        self.assertRaises(TypeError, POINT, 2, 3, 4)

def test_keyword_initializers(self):
        class POINT(Structure):
            _fields_ = [("x", c_int), ("y", c_int)]
        pt = POINT(1, 2)
        self.assertEqual((pt.x, pt.y), (1, 2))

pt = POINT(y=2, x=1)
        self.assertEqual((pt.x, pt.y), (1, 2))

def test_invalid_field_types(self):
        class POINT(Structure):
            pass
        self.assertRaises(TypeError, setattr, POINT, "_fields_", [("x", 1), ("y", 2)])

def test_invalid_name(self):
        # field name must be string
        def declare_with_name(name):
            class S(Structure):
                _fields_ = [(name, c_int)]

self.assertRaises(TypeError, declare_with_name, u"x\xe9")

def test_intarray_fields(self):
        class SomeInts(Structure):
            _fields_ = [("a", c_int * 4)]

# can use tuple to initialize array (but not list!)
        self.assertEqual(SomeInts((1, 2)).a[:], [1, 2, 0, 0])
        self.assertEqual(SomeInts((1, 2)).a[::], [1, 2, 0, 0])
        self.assertEqual(SomeInts((1, 2)).a[::-1], [0, 0, 2, 1])
        self.assertEqual(SomeInts((1, 2)).a[::2], [1, 0])
        self.assertEqual(SomeInts((1, 2)).a[1:5:6], [2])
        self.assertEqual(SomeInts((1, 2)).a[6:4:-1], [])
        self.assertEqual(SomeInts((1, 2, 3, 4)).a[:], [1, 2, 3, 4])
        self.assertEqual(SomeInts((1, 2, 3, 4)).a[::], [1, 2, 3, 4])
        # too long
        # XXX Should raise ValueError?, not RuntimeError
        self.assertRaises(RuntimeError, SomeInts, (1, 2, 3, 4, 5))

def test_nested_initializers(self):
        # test initializing nested structures
        class Phone(Structure):
            _fields_ = [("areacode", c_char*6),
                        ("number", c_char*12)]

class Person(Structure):
            _fields_ = [("name", c_char * 12),
                        ("phone", Phone),
                        ("age", c_int)]

p = Person("Someone", ("1234", "5678"), 5)

self.assertEqual(p.name, "Someone")
        self.assertEqual(p.phone.areacode, "1234")
        self.assertEqual(p.phone.number, "5678")
        self.assertEqual(p.age, 5)

@need_symbol('c_wchar')
    def test_structures_with_wchar(self):
        class PersonW(Structure):
            _fields_ = [("name", c_wchar * 12),
                        ("age", c_int)]

p = PersonW(u"Someone")
        self.assertEqual(p.name, "Someone")

self.assertEqual(PersonW(u"1234567890").name, u"1234567890")
        self.assertEqual(PersonW(u"12345678901").name, u"12345678901")
        # exact fit
        self.assertEqual(PersonW(u"123456789012").name, u"123456789012")
        #too long
        self.assertRaises(ValueError, PersonW, u"1234567890123")

def test_init_errors(self):
        class Phone(Structure):
            _fields_ = [("areacode", c_char*6),
                        ("number", c_char*12)]

class Person(Structure):
            _fields_ = [("name", c_char * 12),
                        ("phone", Phone),
                        ("age", c_int)]

cls, msg = self.get_except(Person, "Someone", (1, 2))
        self.assertEqual(cls, RuntimeError)
        # In Python 2.5, Exception is a new-style class, and the repr changed
        if issubclass(Exception, object):
            self.assertEqual(msg,
                                 "(Phone) <type 'exceptions.TypeError'>: "
                                 "expected string or Unicode object, int found")
        else:
            # Compatibility no longer strictly required
            self.assertEqual(msg,
                                 "(Phone) exceptions.TypeError: "
                                 "expected string or Unicode object, int found")

cls, msg = self.get_except(Person, "Someone", ("a", "b", "c"))
        self.assertEqual(cls, RuntimeError)
        if issubclass(Exception, object):
            self.assertEqual(msg,
                                 "(Phone) <type 'exceptions.TypeError'>: too many initializers")
        else:
            self.assertEqual(msg, "(Phone) exceptions.TypeError: too many initializers")

def test_huge_field_name(self):
        # issue12881: segfault with large structure field names
        def create_class(length):
            class S(Structure):
                _fields_ = [('x' * length, c_int)]

for length in [10 ** i for i in range(0, 8)]:
            try:
                create_class(length)
            except MemoryError:
                # MemoryErrors are OK, we just don't want to segfault
                pass

def get_except(self, func, *args):
        try:
            func(*args)
        except Exception, detail:
            return detail.__class__, str(detail)

@unittest.skip('test disabled')
    def test_subclass_creation(self):
        meta = type(Structure)
        # same as 'class X(Structure): pass'
        # fails, since we need either a _fields_ or a _abstract_ attribute
        cls, msg = self.get_except(meta, "X", (Structure,), {})
        self.assertEqual((cls, msg),
                (AttributeError, "class must define a '_fields_' attribute"))

def test_abstract_class(self):
        class X(Structure):
            _abstract_ = "something"
        # try 'X()'
        cls, msg = self.get_except(eval, "X()", locals())
        self.assertEqual((cls, msg), (TypeError, "abstract class"))

def test_methods(self):
##        class X(Structure):
##            _fields_ = []

self.assertIn("in_dll", dir(type(Structure)))
        self.assertIn("from_address", dir(type(Structure)))
        self.assertIn("in_dll", dir(type(Structure)))

def test_positional_args(self):
        # see also http://bugs.python.org/issue5042
        class W(Structure):
            _fields_ = [("a", c_int), ("b", c_int)]
        class X(W):
            _fields_ = [("c", c_int)]
        class Y(X):
            pass
        class Z(Y):
            _fields_ = [("d", c_int), ("e", c_int), ("f", c_int)]

z = Z(1, 2, 3, 4, 5, 6)
        self.assertEqual((z.a, z.b, z.c, z.d, z.e, z.f),
                         (1, 2, 3, 4, 5, 6))
        z = Z(1)
        self.assertEqual((z.a, z.b, z.c, z.d, z.e, z.f),
                         (1, 0, 0, 0, 0, 0))
        self.assertRaises(TypeError, lambda: Z(1, 2, 3, 4, 5, 6, 7))

def test_pass_by_value(self):
        # This should mirror the structure in Modules/_ctypes/_ctypes_test.c
        class X(Structure):
            _fields_ = [
                ('first', c_ulong),
                ('second', c_ulong),
                ('third', c_ulong),
            ]

s = X()
        s.first = 0xdeadbeef
        s.second = 0xcafebabe
        s.third = 0x0bad1dea
        dll = CDLL(_ctypes_test.__file__)
        func = dll._testfunc_large_struct_update_value
        func.argtypes = (X,)
        func.restype = None
        func(s)
        self.assertEqual(s.first, 0xdeadbeef)
        self.assertEqual(s.second, 0xcafebabe)
        self.assertEqual(s.third, 0x0bad1dea)

class PointerMemberTestCase(unittest.TestCase):

def test(self):
        # a Structure with a POINTER field
        class S(Structure):
            _fields_ = [("array", POINTER(c_int))]

s = S()
        # We can assign arrays of the correct type
        s.array = (c_int * 3)(1, 2, 3)
        items = [s.array[i] for i in range(3)]
        self.assertEqual(items, [1, 2, 3])

# The following are bugs, but are included here because the unittests
        # also describe the current behaviour.
        #
        # This fails with SystemError: bad arg to internal function
        # or with IndexError (with a patch I have)

s.array[0] = 42

items = [s.array[i] for i in range(3)]
        self.assertEqual(items, [42, 2, 3])

s.array[0] = 1

##        s.array[1] = 42

items = [s.array[i] for i in range(3)]
        self.assertEqual(items, [1, 2, 3])

def test_none_to_pointer_fields(self):
        class S(Structure):
            _fields_ = [("x", c_int),
                        ("p", POINTER(c_int))]

s = S()
        s.x = 12345678
        s.p = None
        self.assertEqual(s.x, 12345678)

class TestRecursiveStructure(unittest.TestCase):
    def test_contains_itself(self):
        class Recursive(Structure):
            pass

try:
            Recursive._fields_ = [("next", Recursive)]
        except AttributeError, details:
            self.assertIn("Structure or union cannot contain itself",
                          str(details))
        else:
            self.fail("Structure or union cannot contain itself")

def test_vice_versa(self):
        class First(Structure):
            pass
        class Second(Structure):
            pass

First._fields_ = [("second", Second)]

try:
            Second._fields_ = [("first", First)]
        except AttributeError, details:
            self.assertIn("_fields_ is final", str(details))
        else:
            self.fail("AttributeError not raised")

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

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✏️ test_structures.py