Python ctypes 模块，c_void_p() 实例源码

我们从Python开源项目中，提取了以下50个代码示例，用于说明如何使用ctypes.c_void_p()。

项目：nidaqmx-python 作者：ni | 项目源码 | 文件源码

def _parse_typedefs(self):
        """
        Determines the ctypes data types of the Task and Cal handles 
        based on the version of the NI-DAQmx driver installed.
        """
        from nidaqmx.system.system import System
        system = System.local()

        # If DAQmx 8.8 and lower, TaskHandle is a typedef for uInt32 since
        # DAQmx didn't support 64-bit applications then.
        version = system.driver_version
        if version.major_version <= 8 and version.minor_version <= 8:
            self._task_handle = ctypes.c_uint
        else:
            self._task_handle = ctypes.c_void_p

        self._cal_handle = ctypes.c_uint

项目：rain 作者：scizzorz | 项目源码 | 文件源码

def to_rain(cls, val):
    if val is None:
      return cls.new(typi.null, 0, 0, cls.null)
    elif val is False:
      return cls.new(typi.bool, 0, 0, cls.null)
    elif val is True:
      return cls.new(typi.bool, 0, 1, cls.null)
    elif isinstance(val, int):
      return cls.new(typi.int, 0, val, cls.null)
    elif isinstance(val, float):
      raw = struct.pack('d', val)
      intrep = struct.unpack('Q', raw)[0]
      return cls.new(typi.float, 0, intrep, cls.null)
    elif isinstance(val, str):
      str_p = ct.create_string_buffer(val.encode('utf-8'))
      cls._saves_.append(str_p)
      return cls.new(typi.str, len(val), ct.cast(str_p, ct.c_void_p).value, cls.null)

    raise Exception("Can't convert value {!r} to Rain".format(val))

项目：noc-orchestrator 作者：DirceuSilvaLabs | 项目源码 | 文件源码

def rawaddressof(self, BTypePtr, cdata, offset=None):
        if isinstance(cdata, CTypesBaseStructOrUnion):
            ptr = ctypes.pointer(type(cdata)._to_ctypes(cdata))
        elif isinstance(cdata, CTypesGenericPtr):
            if offset is None or not issubclass(type(cdata)._BItem,
                                                CTypesBaseStructOrUnion):
                raise TypeError("unexpected cdata type")
            ptr = type(cdata)._to_ctypes(cdata)
        elif isinstance(cdata, CTypesGenericArray):
            ptr = type(cdata)._to_ctypes(cdata)
        else:
            raise TypeError("expected a <cdata 'struct-or-union'>")
        if offset:
            ptr = ctypes.cast(
                ctypes.c_void_p(
                    ctypes.cast(ptr, ctypes.c_void_p).value + offset),
                type(ptr))
        return BTypePtr._from_ctypes(ptr)

项目：petronia 作者：groboclown | 项目源码 | 文件源码

def hook_keyboard(callback):
    handle = None

    def low_level_callback(code, rparam, lparam):
        try:
            key_code = 0xFFFFFFFF & lparam[0]  # key code
            callback(key_code, rparam & 0xFFFFFFFF)
        finally:
            return CallNextHookEx(handle, code, rparam, lparam)
    # The really big problem is the callback_pointer.
    # Once it goes out of scope, it is destroyed
    callback_pointer = CFUNCTYPE(c_int, c_int, wintypes.HINSTANCE, POINTER(c_void_p))(low_level_callback)
    __CALLBACK_POINTERS.append(callback_pointer)
    handle = SetWindowsHookExA(WH_KEYBOARD_LL, callback_pointer, GetModuleHandleA(None), 0)
    atexit.register(UnhookWindowsHookEx, handle)
    return handle

项目：petronia 作者：groboclown | 项目源码 | 文件源码

def hook_keyboard():
    def handler(key_code, event_code):
        print("{0} {1}".format(hex(key_code), hex(event_code)))
    handle = None

    def low_level_callback(code, rparam, lparam):
        try:
            key_code = 0xFFFFFFFF & lparam[0]  # key code
            handler(key_code, rparam & 0xFFFFFFFF)
        finally:
            return CallNextHookEx(handle, code, rparam, lparam)

    callback_pointer = CFUNCTYPE(c_int, c_int, wintypes.HINSTANCE, POINTER(c_void_p))(low_level_callback)
    handle = SetWindowsHookExA(WH_KEYBOARD_LL, callback_pointer, GetModuleHandleA(None), 0)
    atexit.register(UnhookWindowsHookEx, handle)

    def on_exit():
        pass

    funcs.shell__pump_messages(on_exit)