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✏️ test_strings.py

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import unittest
from ctypes import *
from ctypes.test import need_symbol
from test import test_support

class StringArrayTestCase(unittest.TestCase):
    def test(self):
        BUF = c_char * 4

buf = BUF("a", "b", "c")
        self.assertEqual(buf.value, "abc")
        self.assertEqual(buf.raw, "abc\000")

buf.value = "ABCD"
        self.assertEqual(buf.value, "ABCD")
        self.assertEqual(buf.raw, "ABCD")

buf.value = "x"
        self.assertEqual(buf.value, "x")
        self.assertEqual(buf.raw, "x\000CD")

buf[1] = "Z"
        self.assertEqual(buf.value, "xZCD")
        self.assertEqual(buf.raw, "xZCD")

self.assertRaises(ValueError, setattr, buf, "value", "aaaaaaaa")
        self.assertRaises(TypeError, setattr, buf, "value", 42)

def test_c_buffer_value(self, memoryview=memoryview):
        buf = c_buffer(32)

buf.value = "Hello, World"
        self.assertEqual(buf.value, "Hello, World")

self.assertRaises(TypeError, setattr, buf, "value", memoryview("Hello, World"))
        self.assertRaises(TypeError, setattr, buf, "value", memoryview("abc"))
        self.assertRaises(ValueError, setattr, buf, "raw", memoryview("x" * 100))

def test_c_buffer_raw(self, memoryview=memoryview):
        buf = c_buffer(32)

buf.raw = memoryview("Hello, World")
        self.assertEqual(buf.value, "Hello, World")
        self.assertRaises(TypeError, setattr, buf, "value", memoryview("abc"))
        self.assertRaises(ValueError, setattr, buf, "raw", memoryview("x" * 100))

def test_c_buffer_deprecated(self):
        # Compatibility with 2.x
        with test_support.check_py3k_warnings():
            self.test_c_buffer_value(buffer)
            self.test_c_buffer_raw(buffer)

def test_param_1(self):
        BUF = c_char * 4
        buf = BUF()
##        print c_char_p.from_param(buf)

def test_param_2(self):
        BUF = c_char * 4
        buf = BUF()
##        print BUF.from_param(c_char_p("python"))
##        print BUF.from_param(BUF(*"pyth"))

def test_del_segfault(self):
        BUF = c_char * 4
        buf = BUF()
        with self.assertRaises(AttributeError):
            del buf.raw

@need_symbol('c_wchar')
class WStringArrayTestCase(unittest.TestCase):
    def test(self):
        BUF = c_wchar * 4

buf = BUF(u"a", u"b", u"c")
        self.assertEqual(buf.value, u"abc")

buf.value = u"ABCD"
        self.assertEqual(buf.value, u"ABCD")

buf.value = u"x"
        self.assertEqual(buf.value, u"x")

buf[1] = u"Z"
        self.assertEqual(buf.value, u"xZCD")

class StringTestCase(unittest.TestCase):
    @unittest.skip('test disabled')
    def test_basic_strings(self):
        cs = c_string("abcdef")

# Cannot call len on a c_string any longer
        self.assertRaises(TypeError, len, cs)
        self.assertEqual(sizeof(cs), 7)

# The value property is the string up to the first terminating NUL.
        self.assertEqual(cs.value, "abcdef")
        self.assertEqual(c_string("abc\000def").value, "abc")

# The raw property is the total buffer contents:
        self.assertEqual(cs.raw, "abcdef\000")
        self.assertEqual(c_string("abc\000def").raw, "abc\000def\000")

# We can change the value:
        cs.value = "ab"
        self.assertEqual(cs.value, "ab")
        self.assertEqual(cs.raw, "ab\000\000\000\000\000")

cs.raw = "XY"
        self.assertEqual(cs.value, "XY")
        self.assertEqual(cs.raw, "XY\000\000\000\000\000")

self.assertRaises(TypeError, c_string, u"123")

@unittest.skip('test disabled')
    def test_sized_strings(self):

# New in releases later than 0.4.0:
        self.assertRaises(TypeError, c_string, None)

# New in releases later than 0.4.0:
        # c_string(number) returns an empty string of size number
        self.assertEqual(len(c_string(32).raw), 32)
        self.assertRaises(ValueError, c_string, -1)
        self.assertRaises(ValueError, c_string, 0)

# These tests fail, because it is no longer initialized
##        self.assertEqual(c_string(2).value, "")
##        self.assertEqual(c_string(2).raw, "\000\000")
        self.assertEqual(c_string(2).raw[-1], "\000")
        self.assertEqual(len(c_string(2).raw), 2)

@unittest.skip('test disabled')
    def test_initialized_strings(self):

self.assertEqual(c_string("ab", 4).raw[:2], "ab")
        self.assertEqual(c_string("ab", 4).raw[:2:], "ab")
        self.assertEqual(c_string("ab", 4).raw[:2:-1], "ba")
        self.assertEqual(c_string("ab", 4).raw[:2:2], "a")
        self.assertEqual(c_string("ab", 4).raw[-1], "\000")
        self.assertEqual(c_string("ab", 2).raw, "a\000")

@unittest.skip('test disabled')
    def test_toolong(self):
        cs = c_string("abcdef")
        # Much too long string:
        self.assertRaises(ValueError, setattr, cs, "value", "123456789012345")

# One char too long values:
        self.assertRaises(ValueError, setattr, cs, "value", "1234567")

@unittest.skip('test disabled')
    def test_perf(self):
        check_perf()

@need_symbol('c_wchar')
class WStringTestCase(unittest.TestCase):
    def test_wchar(self):
        c_wchar(u"x")
        repr(byref(c_wchar(u"x")))
        c_wchar("x")

@unittest.skip('test disabled')
    def test_basic_wstrings(self):
        cs = c_wstring(u"abcdef")

# XXX This behaviour is about to change:
        # len returns the size of the internal buffer in bytes.
        # This includes the terminating NUL character.
        self.assertEqual(sizeof(cs), 14)

# The value property is the string up to the first terminating NUL.
        self.assertEqual(cs.value, u"abcdef")
        self.assertEqual(c_wstring(u"abc\000def").value, u"abc")

self.assertEqual(c_wstring(u"abc\000def").value, u"abc")

# The raw property is the total buffer contents:
        self.assertEqual(cs.raw, u"abcdef\000")
        self.assertEqual(c_wstring(u"abc\000def").raw, u"abc\000def\000")

# We can change the value:
        cs.value = u"ab"
        self.assertEqual(cs.value, u"ab")
        self.assertEqual(cs.raw, u"ab\000\000\000\000\000")

self.assertRaises(TypeError, c_wstring, "123")
        self.assertRaises(ValueError, c_wstring, 0)

@unittest.skip('test disabled')
    def test_toolong(self):
        cs = c_wstring(u"abcdef")
        # Much too long string:
        self.assertRaises(ValueError, setattr, cs, "value", u"123456789012345")

# One char too long values:
        self.assertRaises(ValueError, setattr, cs, "value", u"1234567")

def run_test(rep, msg, func, arg):
    items = range(rep)
    from time import clock
    start = clock()
    for i in items:
        func(arg); func(arg); func(arg); func(arg); func(arg)
    stop = clock()
    print "%20s: %.2f us" % (msg, ((stop-start)*1e6/5/rep))

def check_perf():
    # Construct 5 objects

REP = 200000

run_test(REP, "c_string(None)", c_string, None)
    run_test(REP, "c_string('abc')", c_string, 'abc')

# Python 2.3 -OO, win2k, P4 700 MHz:
#
#      c_string(None): 1.75 us
#     c_string('abc'): 2.74 us

# Python 2.2 -OO, win2k, P4 700 MHz:
#
#      c_string(None): 2.95 us
#     c_string('abc'): 3.67 us

if __name__ == '__main__':
##    check_perf()
    unittest.main()

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✏️ test_strings.py