利用boost 自带的json库，解析数组，json格式如下：

{
  "roomId":"room_123",
  "pubUid":"uid1",
  "subList":[
    "uid2",
    "uid3",
    "uid4"
  ]
}

解析代码：

#include <boost/asio.hpp>
#include <boost/shared_ptr.hpp>
#include <boost/thread.hpp>
#include <boost/thread/mutex.hpp>
#include <boost/bind.hpp>
#include <iostream>
#include <map>
#include <vector>
#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/json_parser.hpp>
int main(int argc, char *argv[])
{
     
    string json_info = json数据;
    boost::property_tree::ptree parse_root;
    boost::property_tree::ptree positions_array;
    std::stringstream strStream(json_info);
    boost::property_tree::read_json(strStream, parse_root);
    string room_id, pubUid;
    vector<string> vec_subId;
    try
    {
        room_id = parse_root.get<string>("roomId");
        pubUid = parse_root.get<string>("pubUid");
        positions_array = parse_root.get_child("subList");
        boost::property_tree::ptree::iterator pos = positions_array.begin();
        for (; pos != positions_array.end(); ++pos)
        {
            boost::property_tree::ptree item = pos->second;
            string uid = item.get<string>("");
            vec_subId.push_back(uid);
        }
    }
    catch (boost::property_tree::ptree_error const &e)
    {
        return 0;
    }
}