Python ctypes.c_short方法代码示例

# 需要导入模块: import ctypes [as 别名]
# 或者: from ctypes import c_short [as 别名]
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))) 

# 需要导入模块: import ctypes [as 别名]
# 或者: from ctypes import c_short [as 别名]
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_performance(self):
##        check_perf() 

# 需要导入模块: import ctypes [as 别名]
# 或者: from ctypes import c_short [as 别名]
def _generate_data(self, bytes, offset):
        if self._bytes_per_sample == 1:
            start = offset
            samples = bytes
            bias = 127
            amplitude = 127
            data = (ctypes.c_ubyte * samples)()
        else:
            start = offset >> 1
            samples = bytes >> 1
            bias = 0
            amplitude = 32767
            data = (ctypes.c_short * samples)()
        step = self.frequency * (math.pi * 2) / self.audio_format.sample_rate
        for i in range(samples):
            data[i] = int(math.sin(step * (i + start)) * amplitude + bias)
        return data 

# 需要导入模块: import ctypes [as 别名]
# 或者: from ctypes import c_short [as 别名]
def dataSources():
    """Return a list with [name, descrition]"""
    dsn = create_buffer(1024)
    desc = create_buffer(1024)
    dsn_len = c_short()
    desc_len = c_short()
    dsn_list = {}
    try:
        lock.acquire()
        if shared_env_h is None:
            AllocateEnv()
    finally:
        lock.release()
    while 1:
        ret = ODBC_API.SQLDataSources(shared_env_h, SQL_FETCH_NEXT, \
            dsn, len(dsn), ADDR(dsn_len), desc, len(desc), ADDR(desc_len))
        if ret == SQL_NO_DATA_FOUND:
            break
        elif not ret in (SQL_SUCCESS, SQL_SUCCESS_WITH_INFO):
            ctrl_err(SQL_HANDLE_ENV, shared_env_h, ret)
        else:
            dsn_list[dsn.value] = desc.value
    return dsn_list 

# 需要导入模块: import ctypes [as 别名]
# 或者: from ctypes import c_short [as 别名]
def _generate_data(self, num_bytes):
        samples = num_bytes >> 1
        value = 0
        maximum = 32767
        minimum = -32768
        data = (ctypes.c_short * samples)()
        step = (maximum - minimum) * 2 * self.frequency / self.audio_format.sample_rate
        envelope = self._envelope_generator
        for i in range(samples):
            value += step
            if value > maximum:
                value = maximum - (value - maximum)
                step = -step
            if value < minimum:
                value = minimum - (value - minimum)
                step = -step
            data[i] = int(value * next(envelope))
        return data 

# 需要导入模块: import ctypes [as 别名]
# 或者: from ctypes import c_short [as 别名]
def shmem_as_ndarray(raw_array):
    _ctypes_to_numpy = {
        ctypes.c_char: np.int8,
        ctypes.c_wchar: np.int16,
        ctypes.c_byte: np.int8,
        ctypes.c_ubyte: np.uint8,
        ctypes.c_short: np.int16,
        ctypes.c_ushort: np.uint16,
        ctypes.c_int: np.int32,
        ctypes.c_uint: np.int32,
        ctypes.c_long: np.int32,
        ctypes.c_ulong: np.int32,
        ctypes.c_float: np.float32,
        ctypes.c_double: np.float64
    }
    dtype = _ctypes_to_numpy[raw_array._type_]

    # The following works too, but occasionally raises
    # RuntimeWarning: Item size computed from the PEP 3118 buffer format string does not match the actual item size.
    # and appears to be slower.
    # return np.ctypeslib.as_array(raw_array)

    return np.frombuffer(raw_array, dtype=dtype) 

# 需要导入模块: import ctypes [as 别名]
# 或者: from ctypes import c_short [as 别名]
def is_ipv6(ip):
    try:
        if os.name == "nt":
            class sockaddr(ctypes.Structure):
                _fields_ = [("sa_family", ctypes.c_short),
                            ("__pad1", ctypes.c_ushort),
                            ("ipv4_addr", ctypes.c_byte * 4),
                            ("ipv6_addr", ctypes.c_byte * 16),
                            ("__pad2", ctypes.c_ulong)]

            WSAStringToAddressA = ctypes.windll.ws2_32.WSAStringToAddressA
            addr = sockaddr()
            addr.sa_family = socket.AF_INET6
            addr_size = ctypes.c_int(ctypes.sizeof(addr))
            if WSAStringToAddressA(ip, socket.AF_INET6, None, ctypes.byref(addr), ctypes.byref(addr_size)) != 0:
                raise socket.error(ctypes.FormatError())
            return ctypes.string_at(addr.ipv6_addr, 16)
        else:
            return socket.inet_pton(socket.AF_INET6, ip)
    except:
        return False 

# 需要导入模块: import ctypes [as 别名]
# 或者: from ctypes import c_short [as 别名]
def cf_number_to_number(value):
        """
        Converts a CFNumber object to a python float or integer

        :param value:
            The CFNumber object

        :return:
            A python number (float or integer)
        """

        type_ = CoreFoundation.CFNumberGetType(_cast_pointer_p(value))
        c_type = {
            1: c_byte,              # kCFNumberSInt8Type
            2: ctypes.c_short,      # kCFNumberSInt16Type
            3: ctypes.c_int32,      # kCFNumberSInt32Type
            4: ctypes.c_int64,      # kCFNumberSInt64Type
            5: ctypes.c_float,      # kCFNumberFloat32Type
            6: ctypes.c_double,     # kCFNumberFloat64Type
            7: c_byte,              # kCFNumberCharType
            8: ctypes.c_short,      # kCFNumberShortType
            9: ctypes.c_int,        # kCFNumberIntType
            10: c_long,             # kCFNumberLongType
            11: ctypes.c_longlong,  # kCFNumberLongLongType
            12: ctypes.c_float,     # kCFNumberFloatType
            13: ctypes.c_double,    # kCFNumberDoubleType
            14: c_long,             # kCFNumberCFIndexType
            15: ctypes.c_int,       # kCFNumberNSIntegerType
            16: ctypes.c_double,    # kCFNumberCGFloatType
        }[type_]
        output = c_type(0)
        CoreFoundation.CFNumberGetValue(_cast_pointer_p(value), type_, byref(output))
        return output.value 

# 需要导入模块: import ctypes [as 别名]
# 或者: from ctypes import c_short [as 别名]
def shape_as(self, obj):
        """
        Return the shape tuple as an array of some other c-types
        type. For example: ``self.shape_as(ctypes.c_short)``.
        """
        if self._zerod:
            return None
        return (obj*self._arr.ndim)(*self._arr.shape) 

# 需要导入模块: import ctypes [as 别名]
# 或者: from ctypes import c_short [as 别名]
def getShort(self,data, index):
		# return two bytes from data as a signed 16-bit value
		return c_short((data[index+1] << 8) + data[index]).value 

# 需要导入模块: import ctypes [as 别名]
# 或者: from ctypes import c_short [as 别名]
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))) 

# 需要导入模块: import ctypes [as 别名]
# 或者: from ctypes import c_short [as 别名]
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)))) 

# 需要导入模块: import ctypes [as 别名]
# 或者: from ctypes import c_short [as 别名]
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)