boost 访问JSON

1. 包含对应的头文件 #include <boost/property_tree/json_parser.hpp>

2.例子

int  main()

{

  boost::property_tree::ptree ptree_root;

  ptree_root.put("root","me_root");

  boost::property_tree::ptree ptree_items;

  {

      boost::property_tree::ptree pt;  //一棵树

      pt.put<int>("item_1",20);

      pt.put<int>("item_2",40);

      ptree_items.push_back(make_pair("",pt));

  }

  {

      boost::property_tree::ptree pt;//又一棵树

      pt.put("item_1","30");

      pt.put("item_2","60");

      ptree_items.push_back(make_pair("",pt));

  }

  ptree_root.put_child("items", ptree_items );

  boost::property_tree::write_json("C:\\file_path.json",ptree_root);

}

3.生成的json文件样子～：

{ //ptree_root

    "root": "me_root",

    "items": [ //ptree_items

        { //pt

            "item_1": "20",

            "item_2": "40"

        },

        { //pt

            "item_1": "30",

            "item_2": "60"

        }

    ]

}

JCK自解：有一个括号，就要一颗ptree。