随着JaveScript的流行和互联网应用,JavaScript里面最强大的
数据类型Object,使用起来及其方便,可以满足所有的数据存储.
为了能更好的做数据交换,设计了JSON协议,能够将JavaScript里面
的Object与Json的转换,Object对象转换成Json数据以后,方便
传输和存储,json变为Object方便对象重建.
Object又叫做表 存放的就是 key:value name:小明
key可以是字符串和数据
value可以是数组,字符串,bool,数组多个value,object
JSON是完全独立于语言的文本格式,易于阅读与编写以及解析.
2使用c语言开源库mjson 解析json
#include "mjson/json.h"/*{ //root"k_num" : 123,"k_str" : "hello","k_logic" : true,"k_null" : null,"k_array" : [1,"hello","2"],"weap_object" : {"default":"putongzidan",}}*/int main(int argc, char*argv[]){//首先建一个空的Objectjson_t* root = json_new_object();//new一个数字 //把这个元素 加到object里json_t* k_num = json_new_number("123");json_insert_pair_into_object(root,"k_num",k_num);json_t* uname = json_new_string("hello");json_insert_pair_into_object(root, "k_str", uname);json_t* logic = json_new_true();json_insert_pair_into_object(root, "k_logic", logic);json_t* knull = json_new_null();json_insert_pair_into_object(root, "k_null", knull);//array 数组json_t *man_array = json_new_array();json_insert_pair_into_object(root, "k_array", man_array);//给数组插入数组json_t* tmp1 = json_new_number("1");json_t* tmp2 = json_new_string("hello");json_insert_child(man_array, tmp1);json_insert_child(man_array, tmp2);//end//嵌套一个Objectjson_t* weap_object = json_new_object();json_insert_pair_into_object(root, "weap_object", weap_object);//嵌套的object 里面在加元素tmp1 = json_new_string("putongzidan");json_insert_pair_into_object(weap_object, "default", tmp1);//end//编码成string text指向这个字符串内存地址char* text = NULL;json_tree_to_string(root, &text);//释放 这个rootprintf("json endcode :\n%s\n",text);//json字符串 变成json对象数 读jsonjson_free_value(&root);root = NULL;json_parse_document(&root,text);//从json文本来生成json对象数free(text);//解码这个字符串json_t* user_name = json_find_first_label(root,"k_str");json_t* user = user_name->child;//获取valueprintf("name type%d:%s\n", user->type, user->text);//解码array里的json_t* user_array = json_find_first_label(root, "k_array");json_t* arrat1 = user_array->child->child;printf("name type%d:%s\n", arrat1->type, arrat1->text);//获取数组 下一个nextjson_t* arrat2 = arrat1->next;printf("name type%d:%s\n", arrat2->type, arrat2->text);//解码object里的json_t* user_object = json_find_first_label(root, "weap_object");json_t* user_object_child = user_object->child->child;arrat2 = user_object_child->child;printf("name type%d:%s\n", arrat2->type, arrat2->text);//还有在释放一次 因为这个是 生成的对象数json_free_value(&root);system("pause");return 0;}JSON数据格式详解
原文地址：http://blog.51cto.com/12158490/2059535