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import unittest, sys
from ctypes.test import need_symbol
class SimpleTypesTestCase(unittest.TestCase):
def setUp(self):
import ctypes
try:
from _ctypes import set_conversion_mode
except ImportError:
pass
else:
self.prev_conv_mode = set_conversion_mode("ascii", "strict")
def tearDown(self):
try:
from _ctypes import set_conversion_mode
except ImportError:
pass
else:
set_conversion_mode(*self.prev_conv_mode)
def test_subclasses(self):
from ctypes import c_void_p, c_char_p
# ctypes 0.9.5 and before did overwrite from_param in SimpleType_new
class CVOIDP(c_void_p):
def from_param(cls, value):
return value * 2
from_param = classmethod(from_param)
class CCHARP(c_char_p):
def from_param(cls, value):
return value * 4
from_param = classmethod(from_param)
self.assertEqual(CVOIDP.from_param("abc"), "abcabc")
self.assertEqual(CCHARP.from_param("abc"), "abcabcabcabc")
@need_symbol('c_wchar_p')
def test_subclasses_c_wchar_p(self):
from ctypes import c_wchar_p
class CWCHARP(c_wchar_p):
def from_param(cls, value):
return value * 3
from_param = classmethod(from_param)
self.assertEqual(CWCHARP.from_param("abc"), "abcabcabc")
# XXX Replace by c_char_p tests
def test_cstrings(self):
from ctypes import c_char_p, byref
# c_char_p.from_param on a Python String packs the string
# into a cparam object
s = b"123"
self.assertIs(c_char_p.from_param(s)._obj, s)
# new in 0.9.1: convert (encode) unicode to ascii
self.assertEqual(c_char_p.from_param(b"123")._obj, b"123")
self.assertRaises(TypeError, c_char_p.from_param, "123\377")
self.assertRaises(TypeError, c_char_p.from_param, 42)
# calling c_char_p.from_param with a c_char_p instance
# returns the argument itself:
a = c_char_p(b"123")
self.assertIs(c_char_p.from_param(a), a)
@need_symbol('c_wchar_p')
def test_cw_strings(self):
from ctypes import byref, c_wchar_p
c_wchar_p.from_param("123")
self.assertRaises(TypeError, c_wchar_p.from_param, 42)
self.assertRaises(TypeError, c_wchar_p.from_param, b"123\377")
pa = c_wchar_p.from_param(c_wchar_p("123"))
self.assertEqual(type(pa), c_wchar_p)
def test_int_pointers(self):
from ctypes import c_short, c_uint, c_int, c_long, POINTER, pointer
LPINT = POINTER(c_int)
## p = pointer(c_int(42))
## x = LPINT.from_param(p)
x = LPINT.from_param(pointer(c_int(42)))
self.assertEqual(x.contents.value, 42)
self.assertEqual(LPINT(c_int(42)).contents.value, 42)
self.assertEqual(LPINT.from_param(None), None)
if c_int != c_long:
self.assertRaises(TypeError, LPINT.from_param, pointer(c_long(42)))
self.assertRaises(TypeError, LPINT.from_param, pointer(c_uint(42)))
self.assertRaises(TypeError, LPINT.from_param, pointer(c_short(42)))
def test_byref_pointer(self):
# The from_param class method of POINTER(typ) classes accepts what is
# returned by byref(obj), it type(obj) == typ
from ctypes import c_short, c_uint, c_int, c_long, pointer, POINTER, byref
LPINT = POINTER(c_int)
LPINT.from_param(byref(c_int(42)))
self.assertRaises(TypeError, LPINT.from_param, byref(c_short(22)))
if c_int != c_long:
self.assertRaises(TypeError, LPINT.from_param, byref(c_long(22)))
self.assertRaises(TypeError, LPINT.from_param, byref(c_uint(22)))
def test_byref_pointerpointer(self):
# See above
from ctypes import c_short, c_uint, c_int, c_long, pointer, POINTER, byref
LPLPINT = POINTER(POINTER(c_int))
LPLPINT.from_param(byref(pointer(c_int(42))))
self.assertRaises(TypeError, LPLPINT.from_param, byref(pointer(c_short(22))))
if c_int != c_long:
self.assertRaises(TypeError, LPLPINT.from_param, byref(pointer(c_long(22))))
self.assertRaises(TypeError, LPLPINT.from_param, byref(pointer(c_uint(22))))
def test_array_pointers(self):
from ctypes import c_short, c_uint, c_int, c_long, POINTER
INTARRAY = c_int * 3
ia = INTARRAY()
self.assertEqual(len(ia), 3)
self.assertEqual([ia[i] for i in range(3)], [0, 0, 0])
# Pointers are only compatible with arrays containing items of
# the same type!
LPINT = POINTER(c_int)
LPINT.from_param((c_int*3)())
self.assertRaises(TypeError, LPINT.from_param, c_short*3)
self.assertRaises(TypeError, LPINT.from_param, c_long*3)
self.assertRaises(TypeError, LPINT.from_param, c_uint*3)
def test_noctypes_argtype(self):
import _ctypes_test
from ctypes import CDLL, c_void_p, ArgumentError
func = CDLL(_ctypes_test.__file__)._testfunc_p_p
func.restype = c_void_p
# TypeError: has no from_param method
self.assertRaises(TypeError, setattr, func, "argtypes", (object,))
class Adapter(object):
def from_param(cls, obj):
return None
func.argtypes = (Adapter(),)
self.assertEqual(func(None), None)
self.assertEqual(func(object()), None)
class Adapter(object):
def from_param(cls, obj):
return obj
func.argtypes = (Adapter(),)
# don't know how to convert parameter 1
self.assertRaises(ArgumentError, func, object())
self.assertEqual(func(c_void_p(42)), 42)
class Adapter(object):
def from_param(cls, obj):
raise ValueError(obj)
func.argtypes = (Adapter(),)
# ArgumentError: argument 1: ValueError: 99
self.assertRaises(ArgumentError, func, 99)
################################################################
if __name__ == '__main__':
unittest.main()
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