import ctypes
import unittest
from ctypes import (Structure, CDLL, CFUNCTYPE,
POINTER, pointer, byref,
c_short, c_int, c_long, c_longlong,
c_byte, c_wchar, c_float, c_double,
ArgumentError)
from test.support import import_helper
_ctypes_test = import_helper.import_module("_ctypes_test")
dll = CDLL(_ctypes_test.__file__)
try:
CALLBACK_FUNCTYPE = ctypes.WINFUNCTYPE
except AttributeError:
# fake to enable this test on Linux
CALLBACK_FUNCTYPE = CFUNCTYPE
class POINT(Structure):
_fields_ = [("x", c_int), ("y", c_int)]
class BasicWrapTestCase(unittest.TestCase):
def wrap(self, param):
return param
def test_wchar_parm(self):
f = dll._testfunc_i_bhilfd
f.argtypes = [c_byte, c_wchar, c_int, c_long, c_float, c_double]
result = f(self.wrap(1), self.wrap("x"), self.wrap(3), self.wrap(4), self.wrap(5.0), self.wrap(6.0))
self.assertEqual(result, 139)
self.assertIs(type(result), int)
def test_pointers(self):
f = dll._testfunc_p_p
f.restype = POINTER(c_int)
f.argtypes = [POINTER(c_int)]
# This only works if the value c_int(42) passed to the
# function is still alive while the pointer (the result) is
# used.
v = c_int(42)
self.assertEqual(pointer(v).contents.value, 42)
result = f(self.wrap(pointer(v)))
self.assertEqual(type(result), POINTER(c_int))
self.assertEqual(result.contents.value, 42)
# This on works...
result = f(self.wrap(pointer(v)))
self.assertEqual(result.contents.value, v.value)
p = pointer(c_int(99))
result = f(self.wrap(p))
self.assertEqual(result.contents.value, 99)
def test_shorts(self):
f = dll._testfunc_callback_i_if
args = []
expected = [262144, 131072, 65536, 32768, 16384, 8192, 4096, 2048,
1024, 512, 256, 128, 64, 32, 16, 8, 4, 2, 1]
def callback(v):
args.append(v)
return v
CallBack = CFUNCTYPE(c_int, c_int)
cb = CallBack(callback)
f(self.wrap(2**18), self.wrap(cb))
self.assertEqual(args, expected)
def test_callbacks(self):
f = dll._testfunc_callback_i_if
f.restype = c_int
f.argtypes = None
MyCallback = CFUNCTYPE(c_int, c_int)
def callback(value):
return value
cb = MyCallback(callback)
result = f(self.wrap(-10), self.wrap(cb))
self.assertEqual(result, -18)
# test with prototype
f.argtypes = [c_int, MyCallback]
cb = MyCallback(callback)
result = f(self.wrap(-10), self.wrap(cb))
self.assertEqual(result, -18)
result = f(self.wrap(-10), self.wrap(cb))
self.assertEqual(result, -18)
AnotherCallback = CALLBACK_FUNCTYPE(c_int, c_int, c_int, c_int, c_int)
# check that the prototype works: we call f with wrong
# argument types
cb = AnotherCallback(callback)
self.assertRaises(ArgumentError, f, self.wrap(-10), self.wrap(cb))
def test_callbacks_2(self):
# Can also use simple datatypes as argument type specifiers
# for the callback function.
# In this case the call receives an instance of that type
f = dll._testfunc_callback_i_if
f.restype = c_int
MyCallback = CFUNCTYPE(c_int, c_int)
f.argtypes = [c_int, MyCallback]
def callback(value):
self.assertEqual(type(value), int)
return value
cb = MyCallback(callback)
result = f(self.wrap(-10), self.wrap(cb))
self.assertEqual(result, -18)
def test_longlong_callbacks(self):
f = dll._testfunc_callback_q_qf
f.restype = c_longlong
MyCallback = CFUNCTYPE(c_longlong, c_longlong)
f.argtypes = [c_longlong, MyCallback]
def callback(value):
self.assertIsInstance(value, int)
return value & 0x7FFFFFFF
cb = MyCallback(callback)
self.assertEqual(13577625587, int(f(self.wrap(1000000000000), self.wrap(cb))))
def test_byval(self):
# without prototype
ptin = POINT(1, 2)
ptout = POINT()
# EXPORT int _testfunc_byval(point in, point *pout)
result = dll._testfunc_byval(ptin, byref(ptout))
got = result, ptout.x, ptout.y
expected = 3, 1, 2
self.assertEqual(got, expected)
# with prototype
ptin = POINT(101, 102)
ptout = POINT()
dll._testfunc_byval.argtypes = (POINT, POINTER(POINT))
dll._testfunc_byval.restype = c_int
result = dll._testfunc_byval(self.wrap(ptin), byref(ptout))
got = result, ptout.x, ptout.y
expected = 203, 101, 102
self.assertEqual(got, expected)
def test_struct_return_2H(self):
class S2H(Structure):
_fields_ = [("x", c_short),
("y", c_short)]
dll.ret_2h_func.restype = S2H
dll.ret_2h_func.argtypes = [S2H]
inp = S2H(99, 88)
s2h = dll.ret_2h_func(self.wrap(inp))
self.assertEqual((s2h.x, s2h.y), (99*2, 88*3))
# Test also that the original struct was unmodified (i.e. was passed by
# value)
self.assertEqual((inp.x, inp.y), (99, 88))
def test_struct_return_8H(self):
class S8I(Structure):
_fields_ = [("a", c_int),
("b", c_int),
("c", c_int),
("d", c_int),
("e", c_int),
("f", c_int),
("g", c_int),
("h", c_int)]
dll.ret_8i_func.restype = S8I
dll.ret_8i_func.argtypes = [S8I]
inp = S8I(9, 8, 7, 6, 5, 4, 3, 2)
s8i = dll.ret_8i_func(self.wrap(inp))
self.assertEqual((s8i.a, s8i.b, s8i.c, s8i.d, s8i.e, s8i.f, s8i.g, s8i.h),
(9*2, 8*3, 7*4, 6*5, 5*6, 4*7, 3*8, 2*9))
def test_recursive_as_param(self):
class A:
pass
a = A()
a._as_parameter_ = a
with self.assertRaises(RecursionError):
c_int.from_param(a)
class AsParamWrapper:
def __init__(self, param):
self._as_parameter_ = param
class AsParamWrapperTestCase(BasicWrapTestCase):
wrap = AsParamWrapper
class AsParamPropertyWrapper:
def __init__(self, param):
self._param = param
def getParameter(self):
return self._param
_as_parameter_ = property(getParameter)
class AsParamPropertyWrapperTestCase(BasicWrapTestCase):
wrap = AsParamPropertyWrapper
class AsParamNestedWrapperTestCase(BasicWrapTestCase):
"""Test that _as_parameter_ is evaluated recursively.
The _as_parameter_ attribute can be another object which
defines its own _as_parameter_ attribute.
"""
def wrap(self, param):
return AsParamWrapper(AsParamWrapper(AsParamWrapper(param)))
if __name__ == '__main__':
unittest.main()
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