使用ctypes将元组的元组从c返回到python

#include <stdlib.h>

int** get_tuples(int num_tuples, int tuple_size) {
    int** tuples = (int**)malloc(num_tuples * sizeof(int*));
    for (int i = 0; i < num_tuples; i++) {
        tuples[i] = (int*)malloc(tuple_size * sizeof(int));
        for (int j = 0; j< tuple_size; j++) {
            tuples[i][j] = i * tuple_size + j;
        }
    }
    return tuples;
}

import ctypes

# 加载C库
lib = ctypes.CDLL('./libctest.so')  # 替换为你的C库的路径

# 定义C函数的参数类型和返回类型
lib.get_tuples.argtypes = (ctypes.c_int, ctypes.c_int)
lib.get_tuples.restype = ctypes.POINTER(ctypes.POINTER(ctypes.c_int))

# 调用C函数
num_tuples = 3
tuple_size = 2
tuples = lib.get_tuples(num_tuples, tuple_size)

# 将C返回的指针转换为Python列表
result = []
for i in range(num_tuples):
    tuple_ptr = ctypes.cast(tuples[i], ctypes.POINTER(ctypes.c_int * tuple_size))
    tuple_val = tuple(tuple_ptr.contents)
    result.append(tuple_val)

# 释放内存
for i in range(num_tuples):
    ctypes.free(tuples[i])
ctypes.free(tuples)

# 输出结果
print(result)