| import unittest |
| from ctypes import * |
| import _ctypes_test |
| |
| class Callbacks(unittest.TestCase): |
| functype = CFUNCTYPE |
| |
| ## def tearDown(self): |
| ## import gc |
| ## gc.collect() |
| |
| def callback(self, *args): |
| self.got_args = args |
| return args[-1] |
| |
| def check_type(self, typ, arg): |
| PROTO = self.functype.__func__(typ, typ) |
| result = PROTO(self.callback)(arg) |
| if typ == c_float: |
| self.assertAlmostEqual(result, arg, places=5) |
| else: |
| self.assertEqual(self.got_args, (arg,)) |
| self.assertEqual(result, arg) |
| |
| PROTO = self.functype.__func__(typ, c_byte, typ) |
| result = PROTO(self.callback)(-3, arg) |
| if typ == c_float: |
| self.assertAlmostEqual(result, arg, places=5) |
| else: |
| self.assertEqual(self.got_args, (-3, arg)) |
| self.assertEqual(result, arg) |
| |
| ################ |
| |
| def test_byte(self): |
| self.check_type(c_byte, 42) |
| self.check_type(c_byte, -42) |
| |
| def test_ubyte(self): |
| self.check_type(c_ubyte, 42) |
| |
| def test_short(self): |
| self.check_type(c_short, 42) |
| self.check_type(c_short, -42) |
| |
| def test_ushort(self): |
| self.check_type(c_ushort, 42) |
| |
| def test_int(self): |
| self.check_type(c_int, 42) |
| self.check_type(c_int, -42) |
| |
| def test_uint(self): |
| self.check_type(c_uint, 42) |
| |
| def test_long(self): |
| self.check_type(c_long, 42) |
| self.check_type(c_long, -42) |
| |
| def test_ulong(self): |
| self.check_type(c_ulong, 42) |
| |
| def test_longlong(self): |
| self.check_type(c_longlong, 42) |
| self.check_type(c_longlong, -42) |
| |
| def test_ulonglong(self): |
| self.check_type(c_ulonglong, 42) |
| |
| def test_float(self): |
| # only almost equal: double -> float -> double |
| import math |
| self.check_type(c_float, math.e) |
| self.check_type(c_float, -math.e) |
| |
| def test_double(self): |
| self.check_type(c_double, 3.14) |
| self.check_type(c_double, -3.14) |
| |
| def test_longdouble(self): |
| self.check_type(c_longdouble, 3.14) |
| self.check_type(c_longdouble, -3.14) |
| |
| def test_char(self): |
| self.check_type(c_char, b"x") |
| self.check_type(c_char, b"a") |
| |
| # disabled: would now (correctly) raise a RuntimeWarning about |
| # a memory leak. A callback function cannot return a non-integral |
| # C type without causing a memory leak. |
| ## def test_char_p(self): |
| ## self.check_type(c_char_p, "abc") |
| ## self.check_type(c_char_p, "def") |
| |
| def test_pyobject(self): |
| o = () |
| from sys import getrefcount as grc |
| for o in (), [], object(): |
| initial = grc(o) |
| # This call leaks a reference to 'o'... |
| self.check_type(py_object, o) |
| before = grc(o) |
| # ...but this call doesn't leak any more. Where is the refcount? |
| self.check_type(py_object, o) |
| after = grc(o) |
| self.assertEqual((after, o), (before, o)) |
| |
| def test_unsupported_restype_1(self): |
| # Only "fundamental" result types are supported for callback |
| # functions, the type must have a non-NULL stgdict->setfunc. |
| # POINTER(c_double), for example, is not supported. |
| |
| prototype = self.functype.__func__(POINTER(c_double)) |
| # The type is checked when the prototype is called |
| self.assertRaises(TypeError, prototype, lambda: None) |
| |
| def test_unsupported_restype_2(self): |
| prototype = self.functype.__func__(object) |
| self.assertRaises(TypeError, prototype, lambda: None) |
| |
| try: |
| WINFUNCTYPE |
| except NameError: |
| pass |
| else: |
| class StdcallCallbacks(Callbacks): |
| functype = WINFUNCTYPE |
| |
| ################################################################ |
| |
| class SampleCallbacksTestCase(unittest.TestCase): |
| |
| def test_integrate(self): |
| # Derived from some then non-working code, posted by David Foster |
| dll = CDLL(_ctypes_test.__file__) |
| |
| # The function prototype called by 'integrate': double func(double); |
| CALLBACK = CFUNCTYPE(c_double, c_double) |
| |
| # The integrate function itself, exposed from the _ctypes_test dll |
| integrate = dll.integrate |
| integrate.argtypes = (c_double, c_double, CALLBACK, c_long) |
| integrate.restype = c_double |
| |
| def func(x): |
| return x**2 |
| |
| result = integrate(0.0, 1.0, CALLBACK(func), 10) |
| diff = abs(result - 1./3.) |
| |
| self.assertTrue(diff < 0.01, "%s not less than 0.01" % diff) |
| |
| ################################################################ |
| |
| if __name__ == '__main__': |
| unittest.main() |