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封装 json-c-0.9.tar.gz 的一些代码

分类： LINUX

2013-07-04 00:10:47

原文地址：封装 json-c-0.9.tar.gz 的一些代码 作者：ojhsky

开源代码

  • json-c-0.9.tar.gz

自己封装的基础函数

代码


点击(此处)折叠或打开

  1. int print_tab(int i)
  2. {
  3.     for (; i>0; --i)
  4.     {
  5.         printf("\t");
  6.     }

  8.     return 0;
  9. }

  11. int json_tree_print(struct json_object *obj, const char *key, int level)
  12. {
  13.     json_type type = json_object_get_type(obj);
  14.     int i = 0;


  17.     //for object
  18.     if (type == json_type_object)
  19.     {
  20.         if (key)
  21.         {
  22.             print_tab(level);
  23.             printf("%s:\n", key);
  24.         }
  25.         print_tab(level);
  26.         printf("{\n");
  27.         level++;

  29.         json_object_object_foreach(obj, key, val) {
  30.             struct json_object *tmp_obj = val;
  31.             json_tree_print(tmp_obj, key, level);
  32.         }

  34.         level--;
  35.         print_tab(level);
  36.         printf("}\n");

  38.     }
  39.     //for array
  40.     else if ((type == json_type_array))
  41.     {
  42.         if (key)
  43.         {
  44.             print_tab(level);
  45.             printf("%s:\n", key);
  46.         }

  48.         print_tab(level);
  49.         printf("[\n");
  50.         level++;

  52.         for(i=0; i < json_object_array_length(obj); i++) {
  53.             struct json_object *array_obj = json_object_array_get_idx(obj, i);
  54.             json_tree_print(array_obj, NULL, level);
  55.         }
  56.         
  57.         level--;
  58.         print_tab(level);
  59.         printf("]\n");

  61.     }
  62.     else
  63.     {
  64.         print_tab(level);
  65.         printf("%s:%s\n", key, json_object_to_json_string(obj));
  66.     }

  68.     return 0;


  71. }

示例


点击(此处)折叠或打开

  1. int main(int argc, char **argv)
  2. {
  3.     struct json_object *root_obj;

  5.     //init
  6.     root_obj = json_tokener_parse(
  7.         "{" \
  8.         " \"switch\": { " \
  9.         " \"ip\":\"192.168.1.1\"," \
  10.         " \"mac\":\"00:11:22:33:44:55\" " \
  11.         " }, " \
  12.         " \"vlan\": { " \
  13.         " \"algo-table\":{" \
  14.         " \"1\":{" \
  15.         " \"src-ip\":1," \
  16.         " \"src-l2-port\":0," \
  17.         " \"src-l4-port\":1" \
  18.         " }" \
  19.         " }," \
  20.         " \"vlan-table\":{" \
  21.         " \"1\":{"
  22.         " \"vid\":123, " \
  23.         " \"port\":\"1-7\" " \
  24.         " }" \
  25.         " }" \
  26.         " }" \
  27.         "}" \
  28.     );

  30.     json_tree_print(root_obj, NULL, 0);

  32.     //release resource
  33.     json_object_put(root_obj);

  35.     return 0;

  37. }

示例的输出


  1. {
  2.     switch:
  3.     {
  4.         ip:"192.168.1.1"
  5.         mac:"00:11:22:33:44:55"
  6.     }
  7.     vlan:
  8.     {
  9.         algo-table:
  10.         {
  11.             1:
  12.             {
  13.                 src-ip:1
  14.                 src-l2-port:0
  15.                 src-l4-port:1
  16.             }
  17.         }
  18.         vlan-table:
  19.         {
  20.             1:
  21.             {
  22.                 vid:123
  23.                 port:"1-7"
  24.             }
  25.         }
  26.     }
  27. }

查找指定的json对象


点击(此处)折叠或打开

  1. typedef struct _key_obj{
  2.     char *key;
  3.     struct json_object *obj;
  4.     struct json_object *parent_obj;

  6. }key_obj;

  8. /*
  9. function description:
  10. if the value of input str is : "vlan.algo-table.1.src-ip", the output top_node_buf will be "vlan"
  11. if the value of input str is : "algo-table.1.src-ip", the output top_node_buf will be "algo-table"
  12. */
  13. int get_top_node(const char *str, char *top_node_buf, int buf_len)
  14. {
  15.     const char *p_start = NULL;
  16.     const char *p_end = NULL;

  18.     if (!str || !top_node_buf)
  19.     {
  20.         return -1;//fail
  21.     }

  23.     p_start = str;
  24.     p_end = strchr(str, '.');

  26.     if (!p_end)
  27.     {
  28.         snprintf(top_node_buf, buf_len, "%s", str);
  29.     }
  30.     else
  31.     {
  32.         int i = 0;
  33.         int len = p_end - p_start;
  34.         
  35.         if ((len) > (buf_len-1))
  36.         {
  37.             return -1;//no enough buffer
  38.         }

  40.         for (i=0; i<len; ++i)
  41.         {
  42.             top_node_buf[i] = p_start[i];
  43.         }
  44.         top_node_buf[i] = '\0';;
  45.     }

  47.     return 0;
  48. }


  51. /*
  52. return key and json object, so we can change the value

  54. only work for json_type_object, for json_type_array, the function will not work
  55. */
  56. int json_get_obj(struct json_object *obj, const char *str, key_obj* output_obj)
  57. {
  58.     json_type type = json_object_get_type(obj);
  59.     char top_node[128] = {0};
  60.     const char *p = NULL;
  61.     int match = 0;
  62.     int i = 0;

  64.     if (!obj || !str)
  65.     {
  66.         return -1;
  67.     }

  69.     if (get_top_node(str, top_node, sizeof(top_node)) != 0)
  70.     {
  71.         return -1;
  72.     }

  74.     p = strchr(str, '.');
  75.     //for object
  76.     if (type == json_type_object)
  77.     {
  78.         json_object_object_foreach(obj, key, val) {
  79.             struct json_object *tmp_obj = val;
  80.             if (!strcmp(top_node, key))
  81.             {
  82.                 match = 1;
  83.                 //leaf now,return node obj
  84.                 if (!p)
  85.                 {
  86.                     output_obj->key = key;
  87.                     output_obj->obj = tmp_obj;
  88.                     output_obj->parent_obj = obj;
  89.                     return 0;
  90.                 }
  91.                 else
  92.                 {
  93.                     return json_get_obj(tmp_obj, ++p, output_obj);
  94.                 }
  95.                 break;
  96.             }
  97.         }

  99.         if (!match)
  100.         {
  101.             return -1;
  102.         }
  103.     }

  105.     return 0;

  107. }


通过文件内容来构造json对象

有现成的函数:

点击(此处)折叠或打开

  1. struct json_object* json_object_from_file(char *filename)

把json对象转化成字符串并保存到文件中

有现成的函数：

点击(此处)折叠或打开

  1. int json_object_to_file(char *filename, struct json_object *obj)

从json对象中读取指定路径的值

代码


点击(此处)折叠或打开

  1. const char * json_get_value(struct json_object *root_obj, const char *str)
  2. {
  3.     key_obj node;

  5.     if (json_get_obj(root_obj, str, &node) != 0)
  6.     {
  7.         return NULL;
  8.     }

  10.     return (const char *)json_object_get_string(node.obj);
  11. }

示例


点击(此处)折叠或打开

  1. int main(int argc, char **argv)
  2. {
  3.     struct json_object *root_obj;

  5.     //init
  6.     root_obj = json_tokener_parse(
  7.         "{" \
  8.         " \"switch\": { " \
  9.         " \"ip\":\"192.168.1.1\"," \
  10.         " \"mac\":\"00:11:22:33:44:55\" " \
  11.         " }, " \
  12.         " \"vlan\": { " \
  13.         " \"algo-table\":{" \
  14.         " \"1\":{" \
  15.         " \"src-ip\":1," \
  16.         " \"src-l2-port\":0," \
  17.         " \"src-l4-port\":1" \
  18.         " }" \
  19.         " }," \
  20.         " \"vlan-table\":{" \
  21.         " \"1\":{"
  22.         " \"vid\":123, " \
  23.         " \"port\":\"1-7\" " \
  24.         " }" \
  25.         " }" \
  26.         " }" \
  27.         "}" \
  28.     );

  30.     printf("get value:[%s]\n", json_get_value(root_obj, "vlan.vlan-table.1.port"));

  32.     //release resource
  33.     json_object_put(root_obj);

  35.     return 0;

  37. }

输出:


  1. get value:[1-7]

在json树中修改指定路径的值

代码：

点击(此处)折叠或打开

  1. int json_set_value(struct json_object *root_obj, const char *str, const char *val)
  2. {
  3.     key_obj node;
  4.     char key[64] = {0};
  5.     struct json_object *obj = NULL;

  7.     if (json_get_obj(root_obj, str, &node) != 0)
  8.     {
  9.         return -1;
  10.     }

  12.     obj = json_object_new_string(val);
  13.     snprintf(key, sizeof(key), "%s", node.key);
  14.     json_object_object_add(node.parent_obj, key, obj);

  16.     return 0;
  17. }
示例：

点击(此处)折叠或打开

  1. int main(int argc, char **argv)
  2. {
  3.     struct json_object *root_obj;

  5.     //init
  6.     root_obj = json_tokener_parse(
  7.         "{" \
  8.         " \"switch\": { " \
  9.         " \"ip\":\"192.168.1.1\"," \
  10.         " \"mac\":\"00:11:22:33:44:55\" " \
  11.         " }, " \
  12.         " \"vlan\": { " \
  13.         " \"algo-table\":{" \
  14.         " \"1\":{" \
  15.         " \"src-ip\":1," \
  16.         " \"src-l2-port\":0," \
  17.         " \"src-l4-port\":1" \
  18.         " }" \
  19.         " }," \
  20.         " \"vlan-table\":{" \
  21.         " \"1\":{"
  22.         " \"vid\":123, " \
  23.         " \"port\":\"1-7\" " \
  24.         " }" \
  25.         " }" \
  26.         " }" \
  27.         "}" \
  28.     );

  30.     printf("get value:[%s]\n", json_get_value(root_obj, "vlan.vlan-table.1.port"));
  31.     json_set_value(root_obj,"vlan.vlan-table.1.port", "8,9" );
  32.     printf("get value:[%s]\n", json_get_value(root_obj, "vlan.vlan-table.1.port"));

  34.     //release resource
  35.     json_object_put(root_obj);

  37.     return 0;

  39. }

输出：

点击(此处)折叠或打开

  1. get value:[1-7]
  2. get value:[8,9]

往json树的指定路径中添加新的对象


点击(此处)折叠或打开

  1. int json_add_json_obj(struct json_object *root_obj, const char *path,
  2.     const char *key, struct json_object *new_obj)
  3. {
  4.     key_obj node;

  6.     if (json_get_obj(root_obj, path, &node) != 0)
  7.     {
  8.         return -1;
  9.     }

  11.     json_object_object_add(node.obj, key, new_obj);

  13.     return 0;
  14. }

示例：

点击(此处)折叠或打开

  1. int main(int argc, char **argv)
  2. {
  3.     struct json_object *root_obj, *new_obj;
  4.     

  6.     int i;
  7.     int ret = -1;

  9.     //init
  10.     root_obj = json_tokener_parse(
  11.         "{" \
  12.         " \"switch\": { " \
  13.         " \"ip\":\"192.168.1.1\"," \
  14.         " \"mac\":\"00:11:22:33:44:55\" " \
  15.         " }, " \
  16.         " \"vlan\": { " \
  17.         " \"algo-table\":{" \
  18.         " \"1\":{" \
  19.         " \"src-ip\":1," \
  20.         " \"src-l2-port\":0," \
  21.         " \"src-l4-port\":1" \
  22.         " }" \
  23.         " }," \
  24.         " \"vlan-table\":{" \
  25.         " \"1\":{"
  26.         " \"vid\":123, " \
  27.         " \"port\":\"1-7\" " \
  28.         " }" \
  29.         " }" \
  30.         " }" \
  31.         "}" \
  32.     );

  34.     new_obj = json_tokener_parse(
  35.         "{" \
  36.         " \"vid\":234," \
  37.         " \"port\":\"8,9\"" \
  38.         "}" \
  39.     );

  41.     printf("-----------------before adding-----------------------------------\n");
  42.     json_tree_print(root_obj, NULL, 0);
  43.     
  44.     json_add_json_obj(root_obj,"vlan.vlan-table","2",new_obj);
  45.     
  46.     printf("-----------------after adding-----------------------------------\n");
  47.     json_tree_print(root_obj, NULL, 0);

  49.     //release resource
  50.     json_object_put(root_obj);

  52.     return 0;

  54. }
输出：

点击(此处)折叠或打开

  1. -----------------before adding-----------------------------------
  2. {
  3.     switch:
  4.     {
  5.         ip:"192.168.1.1"
  6.         mac:"00:11:22:33:44:55"
  7.     }
  8.     vlan:
  9.     {
  10.         algo-table:
  11.         {
  12.             1:
  13.             {
  14.                 src-ip:1
  15.                 src-l2-port:0
  16.                 src-l4-port:1
  17.             }
  18.         }
  19.         vlan-table:
  20.         {
  21.             1:
  22.             {
  23.                 vid:123
  24.                 port:"1-7"
  25.             }
  26.         }
  27.     }
  28. }
  29. -----------------after adding-----------------------------------
  30. {
  31.     switch:
  32.     {
  33.         ip:"192.168.1.1"
  34.         mac:"00:11:22:33:44:55"
  35.     }
  36.     vlan:
  37.     {
  38.         algo-table:
  39.         {
  40.             1:
  41.             {
  42.                 src-ip:1
  43.                 src-l2-port:0
  44.                 src-l4-port:1
  45.             }
  46.         }
  47.         vlan-table:
  48.         {
  49.             1:
  50.             {
  51.                 vid:123
  52.                 port:"1-7"
  53.             }
  54.             2:
  55.             {
  56.                 vid:234
  57.                 port:"8,9"
  58.             }
  59.         }
  60.     }
  61. }

在json树中删除指定路径的对象

代码：

点击(此处)折叠或打开

  1. int json_del_json_obj(struct json_object *root_obj, const char *path)
  2. {
  3.     key_obj node;

  5.     if (json_get_obj(root_obj, path, &node) != 0)
  6.     {
  7.         return -1;
  8.     }

  10.     json_object_object_del(node.parent_obj, node.key);

  12.     return 0;
  13. }

示例：

点击(此处)折叠或打开

  1. int main(int argc, char **argv)
  2. {
  3.     struct json_object *root_obj, *new_obj;
  4.     

  6.     int i;
  7.     int ret = -1;

  9.     //init
  10.     root_obj = json_tokener_parse(
  11.         "{" \
  12.         " \"switch\": { " \
  13.         " \"ip\":\"192.168.1.1\"," \
  14.         " \"mac\":\"00:11:22:33:44:55\" " \
  15.         " }, " \
  16.         " \"vlan\": { " \
  17.         " \"algo-table\":{" \
  18.         " \"1\":{" \
  19.         " \"src-ip\":1," \
  20.         " \"src-l2-port\":0," \
  21.         " \"src-l4-port\":1" \
  22.         " }" \
  23.         " }," \
  24.         " \"vlan-table\":{" \
  25.         " \"1\":{"
  26.         " \"vid\":123, " \
  27.         " \"port\":\"1-7\" " \
  28.         " }" \
  29.         " }" \
  30.         " }" \
  31.         "}" \
  32.     );

  34.     new_obj = json_tokener_parse(
  35.         "{" \
  36.         " \"vid\":234," \
  37.         " \"port\":\"8,9\"" \
  38.         "}" \
  39.     );

  41.     printf("-----------------before deleting-----------------------------------\n");
  42.     json_tree_print(root_obj, NULL, 0);
  43.     
  44.     json_del_json_obj(root_obj,"vlan.vlan-table.1");
  45.     
  46.     printf("-----------------after deleting-----------------------------------\n");
  47.     json_tree_print(root_obj, NULL, 0);

  49.     //release resource
  50.     json_object_put(root_obj);

  52.     return 0;

  54. }

输出：

点击(此处)折叠或打开

  1. -----------------before deleting-----------------------------------
  2. {
  3.     switch:
  4.     {
  5.         ip:"192.168.1.1"
  6.         mac:"00:11:22:33:44:55"
  7.     }
  8.     vlan:
  9.     {
  10.         algo-table:
  11.         {
  12.             1:
  13.             {
  14.                 src-ip:1
  15.                 src-l2-port:0
  16.                 src-l4-port:1
  17.             }
  18.         }
  19.         vlan-table:
  20.         {
  21.             1:
  22.             {
  23.                 vid:123
  24.                 port:"1-7"
  25.             }
  26.         }
  27.     }
  28. }
  29. -----------------after deleting-----------------------------------
  30. {
  31.     switch:
  32.     {
  33.         ip:"192.168.1.1"
  34.         mac:"00:11:22:33:44:55"
  35.     }
  36.     vlan:
  37.     {
  38.         algo-table:
  39.         {
  40.             1:
  41.             {
  42.                 src-ip:1
  43.                 src-l2-port:0
  44.                 src-l4-port:1
  45.             }
  46.         }
  47.         vlan-table:
  48.         {
  49.         }
  50.     }
  51. }












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