1 """ 2 A testcase which accesses *values* in a dll. 3 """ 4 5 import unittest 6 import sys 7 from ctypes import * 8 9 import _ctypes_test 10 11 class ValuesTestCase(unittest.TestCase): 12 13 def test_an_integer(self): 14 ctdll = CDLL(_ctypes_test.__file__) 15 an_integer = c_int.in_dll(ctdll, "an_integer") 16 x = an_integer.value 17 self.assertEqual(x, ctdll.get_an_integer()) 18 an_integer.value *= 2 19 self.assertEqual(x*2, ctdll.get_an_integer()) 20 21 def test_undefined(self): 22 ctdll = CDLL(_ctypes_test.__file__) 23 self.assertRaises(ValueError, c_int.in_dll, ctdll, "Undefined_Symbol") 24 25 class PythonValuesTestCase(unittest.TestCase): 26 """This test only works when python itself is a dll/shared library""" 27 28 def test_optimizeflag(self): 29 # This test accesses the Py_OptimizeFlag intger, which is 30 # exported by the Python dll. 31 32 # It's value is set depending on the -O and -OO flags: 33 # if not given, it is 0 and __debug__ is 1. 34 # If -O is given, the flag is 1, for -OO it is 2. 35 # docstrings are also removed in the latter case. 36 opt = c_int.in_dll(pythonapi, "Py_OptimizeFlag").value 37 if __debug__: 38 self.assertEqual(opt, 0) 39 elif ValuesTestCase.__doc__ is not None: 40 self.assertEqual(opt, 1) 41 else: 42 self.assertEqual(opt, 2) 43 44 def test_frozentable(self): 45 # Python exports a PyImport_FrozenModules symbol. This is a 46 # pointer to an array of struct _frozen entries. The end of the 47 # array is marked by an entry containing a NULL name and zero 48 # size. 49 50 # In standard Python, this table contains a __hello__ 51 # module, and a __phello__ package containing a spam 52 # module. 53 class struct_frozen(Structure): 54 _fields_ = [("name", c_char_p), 55 ("code", POINTER(c_ubyte)), 56 ("size", c_int)] 57 FrozenTable = POINTER(struct_frozen) 58 59 ft = FrozenTable.in_dll(pythonapi, "PyImport_FrozenModules") 60 # ft is a pointer to the struct_frozen entries: 61 items = [] 62 for entry in ft: 63 # This is dangerous. We *can* iterate over a pointer, but 64 # the loop will not terminate (maybe with an access 65 # violation;-) because the pointer instance has no size. 66 if entry.name is None: 67 break 68 items.append((entry.name, entry.size)) 69 70 expected = [("__hello__", 104), 71 ("__phello__", -104), 72 ("__phello__.spam", 104)] 73 self.assertEqual(items, expected) 74 75 from ctypes import _pointer_type_cache 76 del _pointer_type_cache[struct_frozen] 77 78 def test_undefined(self): 79 self.assertRaises(ValueError, c_int.in_dll, pythonapi, 80 "Undefined_Symbol") 81 82 if __name__ == '__main__': 83 unittest.main() 84
