序列化和反序列化助推JSON [英] Serializing and deserializing json with boost

问题描述

我是新手， C ++ 。什么是序列化和反序列化类型的std ::地图使用升压的数据最简单的方法。我发现一些例子使用 PropertyTree ，但他们还不清楚我。

I'm newbie to c++. What's the easiest way to serialize and deserialize data of type std::Map using boost. I've found some examples with using PropertyTree but they are obscure for me.

推荐答案

注意 property_tree 间$ P $点的按键为路径，例如把一对A·B=z的将创建一个{一：{B：Z}} JSON，而不是一个{A·B：Z}。否则，使用 property_tree 实在是微不足道。这里是一个小例子。

Note that property_tree interprets the keys as paths, e.g. putting the pair "a.b"="z" will create an {"a":{"b":"z"}} JSON, not an {"a.b":"z"}. Otherwise, using property_tree is trivial. Here is a little example.

#include <sstream>
#include <map>
#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/json_parser.hpp>

using boost::property_tree::ptree;
using boost::property_tree::read_json;
using boost::property_tree::write_json;

void example() {
  // Write json.
  ptree pt;
  pt.put ("foo", "bar");
  std::ostringstream buf; 
  write_json (buf, pt, false);
  std::string json = buf.str(); // {"foo":"bar"}

  // Read json.
  ptree pt2;
  std::istringstream is (json);
  read_json (is, pt2);
  std::string foo = pt2.get<std::string> ("foo");
}

std::string map2json (const std::map<std::string, std::string>& map) {
  ptree pt; 
  for (auto& entry: map) 
      pt.put (entry.first, entry.second);
  std::ostringstream buf; 
  write_json (buf, pt, false); 
  return buf.str();
}

这篇关于序列化和反序列化助推JSON的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！