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Copy pathtest_array_in_pointer.py
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64 lines (47 loc) · 1.7 KB
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import unittest
from ctypes import *
from binascii import hexlify
import re
def dump(obj):
# helper function to dump memory contents in hex, with a hyphen
# between the bytes.
h = hexlify(memoryview(obj)).decode()
return re.sub(r"(..)", r"\1-", h)[:-1]
class Value(Structure):
_fields_ = [("val", c_byte)]
class Container(Structure):
_fields_ = [("pvalues", POINTER(Value))]
class Test(unittest.TestCase):
def test(self):
# create an array of 4 values
val_array = (Value * 4)()
# create a container, which holds a pointer to the pvalues array.
c = Container()
c.pvalues = val_array
# memory contains 4 NUL bytes now, that's correct
self.assertEqual("00-00-00-00", dump(val_array))
# set the values of the array through the pointer:
for i in range(4):
c.pvalues[i].val = i + 1
values = [c.pvalues[i].val for i in range(4)]
# These are the expected results: here s the bug!
self.assertEqual(
(values, dump(val_array)),
([1, 2, 3, 4], "01-02-03-04")
)
def test_2(self):
val_array = (Value * 4)()
# memory contains 4 NUL bytes now, that's correct
self.assertEqual("00-00-00-00", dump(val_array))
ptr = cast(val_array, POINTER(Value))
# set the values of the array through the pointer:
for i in range(4):
ptr[i].val = i + 1
values = [ptr[i].val for i in range(4)]
# These are the expected results: here s the bug!
self.assertEqual(
(values, dump(val_array)),
([1, 2, 3, 4], "01-02-03-04")
)
if __name__ == "__main__":
unittest.main()