import ctypes

# 定义内部结构体
class InnerStructLevel2(ctypes.Structure):
    _pack_ = 1
    _fields_ = [
        ("inner_field1", ctypes.c_char),
        ("inner_field2", ctypes.c_double),
        ("inner_field3", ctypes.c_double),
    ]

# 定义内部结构体
class InnerStructLevel1(ctypes.Structure):
    _pack_ = 1
    _fields_ = [
        ("inner_field1", ctypes.c_int),
        ("inner_field2", ctypes.c_double),
        ("inner_level2_field3", InnerStructLevel2)
    ]



# 定义外部结构体
class OuterStruct(ctypes.Structure):
    _pack_ = 1
    _fields_ = [
        ("field1", ctypes.c_int),
        ("nested", InnerStructLevel1),  # 嵌套结构体
        ("field2", ctypes.c_char * 10),
    ]