boost库用property_tree读xml文件

深刻理解boost property_tree的用法，通过一级循环判断，来遍历xml文件里的一级二级目录；源代码：#include<boost/property_tree/ptree.hpp>#include<boost/property_tree/xml_parser.hpp>#include<iostream>int main(){boost::property_tree::ptree pt;std::string fileName = "E:\\trade\\config\\acsyconf002.xml";boost::property_tree::xml_parser::read_xml(fileName, pt);std::string xml;std::string xml1;for (auto &m : pt){if (m.first == "group"){xml1 = "";xml = m.second.get("account"," ");std::cout << xml << std::endl;for (auto &m1 : m.second){if (m1.first == "user"){xml1 = xml1+m1.second.get_value<std::string>()+"|";}}std::string xml2 = xml1.substr(0, xml1.size()-1);std::cout << xml2 << std::endl;//std::string xmlLast = xml.substr(0, xml.size());//std::cout << xmlLast << std::endl;}}return 0;}XML文件：<config><subport>10003</subport><swebdir>D:\Project\server\src\web</swebdir><database>E:\trade\config\all_cnfut_db_gy.dat</database><filenameURL>H:\tesrt</filenameURL><logURL>E:\trade\log\trade_log_acsy001.log</logURL><swebport>8006</swebport><distbin>D:\Project\tradesrc\bin\Debug</distbin></config><group><account>020368</account><user>01</user><user>02</user><user>03</user></group><group><account>831598</account><user>01</user></group>