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Issue #19023: Document ctypes array and pointer classes

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Also add some more tests. Based on patch by Sye van der Veen.
This commit is contained in:
Martin Panter 2016-01-29 10:12:19 +00:00
parent 22532ac2eb
commit 34360c8e09
4 changed files with 70 additions and 10 deletions
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12
Lib/ctypes/test/test_arrays.py
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@ -24,20 +24,24 @@ class ArrayTestCase(unittest.TestCase):
self.assertEqual(len(ia), alen)
# slot values ok?
values = [ia[i] for i in range(len(init))]
values = [ia[i] for i in range(alen)]
self.assertEqual(values, init)
# out-of-bounds accesses should be caught
with self.assertRaises(IndexError): ia[alen]
with self.assertRaises(IndexError): ia[-alen-1]
# change the items
from operator import setitem
new_values = list(range(42, 42+alen))
[setitem(ia, n, new_values[n]) for n in range(alen)]
values = [ia[i] for i in range(len(init))]
values = [ia[i] for i in range(alen)]
self.assertEqual(values, new_values)
# are the items initialized to 0?
ia = int_array()
values = [ia[i] for i in range(len(init))]
self.assertEqual(values, [0] * len(init))
values = [ia[i] for i in range(alen)]
self.assertEqual(values, [0] * alen)
# Too many initializers should be caught
self.assertRaises(IndexError, int_array, *range(alen*2))

9
Lib/ctypes/test/test_pointers.py
View file

@ -56,9 +56,13 @@ class PointersTestCase(unittest.TestCase):
# C code:
# int x = 12321;
# res = &x
res.contents = c_int(12321)
x = c_int(12321)
res.contents = x
self.assertEqual(i.value, 54345)
x.value = -99
self.assertEqual(res.contents.value, -99)
def test_callbacks_with_pointers(self):
# a function type receiving a pointer
PROTOTYPE = CFUNCTYPE(c_int, POINTER(c_int))
@ -131,9 +135,10 @@ class PointersTestCase(unittest.TestCase):
def test_basic(self):
p = pointer(c_int(42))
# Although a pointer can be indexed, it ha no length
# Although a pointer can be indexed, it has no length
self.assertRaises(TypeError, len, p)
self.assertEqual(p[0], 42)
self.assertEqual(p[0:1], [42])
self.assertEqual(p.contents.value, 42)
def test_charpp(self):