JSON-C

要用到c编辑json串，看到一段代码写的不错，摘过来参考。
环境是centos7，json-c-devel-0.11-4.el7_0.x86_64
一开始编译不过去，应该是摘过来的代码太老了，有的函数不支持，改过后能编译执行。
//----------------------------------------------------//AUTHOR: lanyang123456//DATE: 2014-12-13//----------------------------------------------------json-c介绍与库下载请参考[cpp] view plain copy

#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <assert.h>

#include <json/json.h>

    void test_jsonc()
    {

        struct json_object *infor_object = NULL;
        infor_object = json_object_new_object();
        if (NULL == infor_object)
        {
            printf("new json object failed.\n");
            return;
        }

        struct json_object *para_object = NULL;
        para_object = json_object_new_object();
        if (NULL == para_object)
        {
            json_object_put(infor_object);//free
            printf("new json object failed.\n");
            return;
        }

        struct json_object *array_object = NULL;
        array_object = json_object_new_array();
        if (NULL == array_object)
        {
            json_object_put(infor_object);//free
            json_object_put(para_object);//free
            printf("new json object failed.\n");
            return;
        }

        /*添加json值类型到数组中*/
        json_object_array_add(array_object, json_object_new_int(256));
        json_object_array_add(array_object, json_object_new_int(257));
        json_object_array_add(array_object, json_object_new_int(258));

        json_object_object_add(para_object, "DeviceId", json_object_new_string("sn_iso_9000"));
        json_object_object_add(para_object, "MacAddr", json_object_new_string("AA:BB:CC:DD:EE:FF"));
        json_object_object_add(para_object, "Visible", json_object_new_int(1));

        /*添加json名称和值到json对象集合中*/
        json_object_object_add(infor_object, "method", json_object_new_string("GetSystemInfo"));
        json_object_object_add(infor_object, "param", para_object);
        json_object_object_add(infor_object, "id", json_object_new_string("101"));

        /*添加数组集合到json对象中*/
        json_object_object_add(infor_object, "array", array_object);

        printf("-----------json infor ---------------------------\n");
        printf("%s\n", json_object_to_json_string(infor_object));
        printf("-----------json infor ---------------------------\n");

        struct json_object *result_object = NULL;


        json_object_object_get_ex(infor_object, "method",&result_object);
        printf("-----------result_object method ---------------------------\n");
        printf("%s\n", json_object_to_json_string(result_object));
        printf("-----------result_object method---------------------------\n");

        json_object_object_get_ex(infor_object, "param",&result_object);
        printf("-----------result_object param ---------------------------\n");
        printf("%s\n", json_object_to_json_string(result_object));
        printf("-----------result_object param---------------------------\n");

        json_object_object_get_ex(infor_object, "array",&result_object);
        printf("-----------result_object array---------------------------\n");
        printf("%s\n", json_object_to_json_string(result_object));
        printf("-----------result_object array---------------------------\n");

        int i;
        for(i = 0; i < json_object_array_length(result_object); i++) {
          struct json_object *obj = json_object_array_get_idx(result_object, i);
          printf("\t[%d]=%s\n", i, json_object_to_json_string(obj));
        }

        json_object_put(infor_object);//free

    }


    int main(int argc, char *argv[])
    {
        test_jsonc();

        return 0;
    }

# gcc -ljson-c -o main main.c
[root@ca example]# ./main
-----------json infor ---------------------------
{ "method": "GetSystemInfo", "param": { "DeviceId": "sn_iso_9000", "MacAddr": "AA:BB:CC:DD:EE:FF", "Visible": 1 }, "id": "101", "array": [ 256, 257, 258 ] }
-----------json infor ---------------------------
-----------result_object method ---------------------------
"GetSystemInfo"
-----------result_object method---------------------------
-----------result_object param ---------------------------
{ "DeviceId": "sn_iso_9000", "MacAddr": "AA:BB:CC:DD:EE:FF", "Visible": 1 }
-----------result_object param---------------------------
-----------result_object array---------------------------
[ 256, 257, 258 ]
-----------result_object array---------------------------
        [0]=256
        [1]=257
        [2]=258