json-c例子

//----------------------------------------------------

//AUTHOR: lanyang123456

//DATE: 2014-12-13

//----------------------------------------------------

json-c介绍与库下载请参考

https://github.com/json-c/json-c/wiki

#include 
#include 

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;


    result_object =  json_object_object_get(infor_object, "method");
    printf("-----------result_object method ---------------------------\n");
    printf("%s\n", json_object_to_json_string(result_object));
    printf("-----------result_object method---------------------------\n");

    result_object =  json_object_object_get(infor_object, "param");
    printf("-----------result_object param ---------------------------\n");
    printf("%s\n", json_object_to_json_string(result_object));
    printf("-----------result_object param---------------------------\n");

    result_object =  json_object_object_get(infor_object, "array");
    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;
}














编译与执行


$ gcc -o test1 test1.c -ljson
 $ ./test1
 -----------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