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最新推荐文章于 2025-12-13 10:45:57 发布

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#json #c/c++

本文介绍如何使用Boost库中的Property Tree模块来解析和修改JSON文件。文中详细展示了创建JSON对象、写入文件、从字符串中读取JSON内容并进行修改的过程。此外，还提供了异常处理的示例。

#include <boost/property_tree/ptree.hpp>
#include <boost/typeof/typeof.hpp>
#include <boost/property_tree/json_parser.hpp>
#include <boost/property_tree/xml_parser.hpp>
#include <boost/property_tree/json_parser.hpp>
using namespace boost::property_tree;

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);

try
    {
        /*std::stringstream ss;
        ss << "{\"cmd\":\"19\",\"gwID\":\"00CD85462414\",\"devID\":\"695AA901004B1200\",\"type\":\"02\",\"data\":{\"status\":\"1\"}}";

boost::property_tree::ptree pt;
boost::property_tree::read_json(ss, pt);

  std::string cmd = pt.get<std::string>("cmd");
  std::string gwID = pt.get<std::string>("gwID");
  std::string devID = pt.get<std::string>("devID");
  std::string type = pt.get<std::string>("type");*/
  string s = "{\"age\" : 26,\"study\":{\"language\":{\"one\":\"chinese\",\"two\":\"math\"},\"fee\":500,\"subject\":[{\"one\":\"china\"},{\"one\":\"Eglish\"}]},\"person\":[{\"id\":1,\"name\":\"chen\"},{\"id\":2,\"name\":\"zhang\"}],\"name\" : \"huchao\"}";

ptree pt;

stringstream stream(s); //这步不知道为什么要这样

read_json<ptree>( stream, pt);

pt.put("study.language.one","physics");//修改数据（这步废了好久时间，最后通过读英文资料解决）

pt.put("study.fee",600);

string s1=pt.get<string>("age");

cout<<s1<<endl;

    }
    catch (std::exception const& e)
    {
        std::cerr << e.what() << std::endl;
    }