主要是您需要
c_void_pvoid *，并且必须使用取消引用返回值
.contents。
这是一个工作示例（Windows）…
编辑 ：我添加了一个铸造空指针成员的示例。
测试
#ifdef EXPORT#define API __declspec(dllexport)#else#define API __declspec(dllimport)#endiftypedef struct{ int a; void* b;} mytype;API mytype* createMyType();API void destroyMyType(mytype* p);测试
#define EXPORT#include <stdlib.h>#include <stdio.h>#include "test.h"API mytype* createMyType(){ int* tmp; mytype* p = malloc(sizeof(mytype)); p->a = 5; tmp = malloc(sizeof(int)); *tmp = 123; p->b = tmp; printf("%d %pn",p->a,p->b); return p;}API void destroyMyType(mytype* p){ free(p->b); free(p);}test.py
from ctypes import *class mytype(Structure): _fields_ = [('a',c_int), ('b',c_void_p)]test = CDLL('test')createMyType = test.createMyTypecreateMyType.argtypes = NonecreateMyType.restype = POINTER(mytype)destroyMyType = test.destroyMyTypedestroyMyType.argtypes = POINTER(mytype),destroyMyType.restype = Nonet = createMyType()print('t is',t)print('t.a is',t.contents.a)print('t.b is',hex(t.contents.b))b = cast(t.contents.b,POINTER(c_int))print('*b is',b.contents)destroyMyType(t)输出 ：请注意，C代码中输出的void *b地址与所返回的整数匹配
t.contents.b。将该
cast整数转换为
POINTER(c_int)可以提取内容的位置。
5 00000216C0E2A5D0t is <__main__.LP_mytype object at 0x00000216C30C4A48>t.a is 5t.b is 0x216c0e2a5d0*b is c_long(123)
