backend_ctypes.py 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)