Showing content from http://svn.python.org/projects/python/branches/ctypes-branch/Lib/ctypes/test/test_varsize_struct.py below:
from ctypes import * import unittest class VarSizeTest(unittest.TestCase): def test_resize(self): class X(Structure): _fields_ = [("item", c_int), ("array", c_int * 1)] self.failUnlessEqual(sizeof(X), sizeof(c_int) * 2) x = X() x.item = 42 x.array[0] = 100 self.failUnlessEqual(sizeof(x), sizeof(c_int) * 2) # make room for one additional item new_size = sizeof(X) + sizeof(c_int) * 1 resize(x, new_size) self.failUnlessEqual(sizeof(x), new_size) self.failUnlessEqual((x.item, x.array[0]), (42, 100)) # make room for 10 additional items new_size = sizeof(X) + sizeof(c_int) * 9 resize(x, new_size) self.failUnlessEqual(sizeof(x), new_size) self.failUnlessEqual((x.item, x.array[0]), (42, 100)) # make room for one additional item new_size = sizeof(X) + sizeof(c_int) * 1 resize(x, new_size) self.failUnlessEqual(sizeof(x), new_size) self.failUnlessEqual((x.item, x.array[0]), (42, 100)) def test_array_invalid_length(self): # cannot create arrays with non-positive size self.failUnlessRaises(ValueError, lambda: c_int * -1) self.failUnlessRaises(ValueError, lambda: c_int * -3) def test_zerosized_array(self): array = (c_int * 0)() # accessing elements of zero-sized arrays raise IndexError self.failUnlessRaises(IndexError, array.__setitem__, 0, None) self.failUnlessRaises(IndexError, array.__getitem__, 0) self.failUnlessRaises(IndexError, array.__setitem__, 1, None) self.failUnlessRaises(IndexError, array.__getitem__, 1) self.failUnlessRaises(IndexError, array.__setitem__, -1, None) self.failUnlessRaises(IndexError, array.__getitem__, -1) if __name__ == "__main__": unittest.main()
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