Python ctypes Windows平台c_int32跨平台行为异常报错修复

执行如下测试代码：

import ctypes
print(ctypes.c_int32)

• Linux（及macOS）平台执行返回 <class 'ctypes.c_int32'>
• Windows平台执行返回 <class 'ctypes.c_long'>
  两个平台行为存在差异，目标是实现Windows端运行逻辑与Linux端完全一致。

现有自定义类型实现 #

项目中定义了如下自定义ctype类：

class ctype:
    ....
    ctype.int32 = _make_ctype_from_ctypes(ctypes.c_int32)
    ....

配套的类型构造函数实现如下：

def _make_ctype_from_ctypes(ctypes_type):
    ctypes_namespace = dict(ctypes_type.__dict__)

    namespace = {
        "__module__": _Numeric.__module__,
        "_type_": ctypes_namespace["_type_"],
    }

    return type(
        ctypes_type.__name__.replace("c_", ""),
        tuple([_Numeric, *ctypes_type.__bases__]),
        namespace,
    )

报错触发点 #

报错触发位置为_Numeric类的__init__方法，箭头标注处为报错行：

class _Numeric:
    _type_: str

    def __init__(self, value):
        if isinstance(value, (bytearray, bytes)):
            value = struct.unpack(self._type_, value)[0]
        if isinstance(value, _Numeric):
            value = value.value
        if "int" in self.__class__.__name__:
            value = int(value)
        super().__init__(value) <-------------

初始报错堆栈信息如下：

Traceback (most recent call last):
  File "C:\Users\wotori\git\L2py\main.py", line 5, in <module>
    print(clock.ticks)
  File "C:\Users\wotori\git\L2py\game\game\models\world.py", line 40, in ticks
    return ctype.int(int(time.time() - self.start_time) / self.MSEC_IN_TICK)
  File "C:\Users\wotori\git\L2py\common\common\ctype.py", line 19, in __init__
    super().__init__(value)
TypeError: 'float' object cannot be interpreted as an integer

在报错行添加异常捕获逻辑打印参数，代码如下：

try:
    super().__init__(value)
except Exception as e:
    print("error", e, value)

错误场景下的打印输出：

error 'float' object cannot be interpreted as an integer 1639347702.44
error 'float' object cannot be interpreted as an integer 0.0

• 该代码在Linux、macOS平台可正常运行，仅Windows平台触发上述错误。

最小复现示例 #

两台设备均安装64位版本Python，如下代码在Linux平台可无错运行，在Windows平台运行失败：

if __name__ == '__main__':
    from dataclasses import dataclass, field
    import time


    @dataclass(kw_only=True)
    class Clock:
        start_time: int = field(default=int(time.time()))
        _is_night = False
        TICKS_PER_SECOND = 10
        MSEC_IN_TICK = 1000 / TICKS_PER_SECOND

        @property
        def is_night(self):
            return self.hours < 6

        @property
        def hours(self):
            return (self.get_time() / 60) % 24

        @property
        def ticks(self):
            return ctype.int(int(time.time() - self.start_time) / self.MSEC_IN_TICK)

        def get_time(self):
            return ctype.int32(self.ticks / (self.TICKS_PER_SECOND * 10))


    import struct


    class _Numeric:
        _type_: str

        def __init__(self, value):
            if isinstance(value, (bytearray, bytes)):
                value = struct.unpack(self._type_, value)[0]
            if isinstance(value, _Numeric):
                value = value.value
            if "int" in self.__class__.__name__:
                value = int(value)
            super().__init__(value)


    def _make_ctype_from_ctypes(ctypes_type):
        ctypes_namespace = dict(ctypes_type.__dict__)

        namespace = {
            "__module__": _Numeric.__module__,
            "_type_": ctypes_namespace["_type_"],
        }

        return type(
            ctypes_type.__name__.replace("c_", ""),
            tuple([_Numeric, *ctypes_type.__bases__]),
            namespace,
        )


    import ctypes


    class ctype:  # noqa
        int = _make_ctype_from_ctypes(ctypes.c_int)
        int32 = _make_ctype_from_ctypes(ctypes.c_int32)


    clock = Clock()
    print(clock.ticks)

Windows平台报错堆栈：

Traceback (most recent call last):
  File "C:\Users\wotori\git\L2py\main.py", line 69, in <module>
    print(clock.ticks)
  File "C:\Users\wotori\git\L2py\main.py", line 23, in ticks
    return ctype.int(int(time.time() - self.start_time) / self.MSEC_IN_TICK)
  File "C:\Users\wotori\git\L2py\main.py", line 42, in __init__
    super().__init__(value)
TypeError: 'float' object cannot be interpreted as an integer

• 预期正常运行返回结果为int(0)。

问题核心是代码里两处逻辑依赖ctypes类型的__name__做判断，跨平台时别名差异导致逻辑失效：

1. Windows