cJSON获取json数据的所有的key

小记

使用cJSON实现获取json数据中所有的key的值，然后对key值做相应的处理操作

笔记

首先先看了一下cJSON的结构体，双向链表结构。

// cJSON结构体: typedef struct cJSON { struct cJSON *next,*prev; // next/prev allow you to walk array/object chains. Alternatively, use GetArraySize/GetArrayItem/GetObjectItem struct cJSON *child; // An array or object item will have a child pointer pointing to a chain of the items in the array/object. int type; // The type of the item, as above. char *valuestring; // The item's string, if type==cJSON_String int valueint; // The item's number, if type==cJSON_Number double valuedouble; // The item's number, if type==cJSON_Number char *string; // The item's name string, if this item is the child of, or is in the list of subitems of an object. } cJSON;

包含了key以及指向下一个结点的指针 那么就直接遍历链表就好了

实现如下：

#include <stdio.h> #include <string.h> #include "cJSON.h" #include "pub_function.h" int main(){ cJSON * test_json; char *content=read_json("./testjson.json"); test_json=cJSON_Parse(content); cJSON * testitem_json=cJSON_GetObjectItem(test_json,"device_type"); while (testitem_json->next!=NULL) { printf("%s\n",testitem_json->string); testitem_json=testitem_json->next; } }

运行结果： json文件：

{ "device_type": "WSD_General", "modal_type": "WSD", "device_name": "SNMP网络路由", "address": "192.168.32.2", "get_community": "public", "set_community": "public" }