boost库简单读写xml

#include <boost/property_tree/ptree.hpp>  
#include <boost/property_tree/xml_parser.hpp>  
#include <boost/foreach.hpp>  
#include <boost/algorithm/string.hpp>  
#include <sstream>


void saveToXml()
{
    using namespace boost::property_tree;
    ptree pt;
//把容器数据写入xml
    for (int i = 0; i < s_ptsMap.size(); i++)
    {
        std::stringstream ss_i;
        ss_i << "vce_map." <<"vec" << i;

        for (int j = 0; j < s_ptsMap[i]->size(); j++)
        {
            std::stringstream ss_j;
            ss_j << "." << "pt" << j;
            auto STR = ss_i.str() + ss_j.str();
            pt.add(STR + ".x", s_ptsMap[i]->at(j).x());
            pt.add(STR + ".y", s_ptsMap[i]->at(j).y());
            pt.add(STR + ".z", s_ptsMap[i]->at(j).z());
        }
    }
//boost 库函数
    boost::property_tree::xml_writer_settings<std::string> settings('\t', 1);
    write_xml("res/tt.xml", pt, std::locale(), settings);
}

void readFromXml(const std::string& fileName)
{
    using namespace boost::property_tree;

    ptree pt, vec_list, point_list;
    read_xml(fileName, pt);
    vec_list = pt.get_child("vce_map");

    int i = 0;

    for (auto vec = vec_list.begin(); vec != vec_list.end(); vec++)  
    {
        std::stringstream ss_i;
        ss_i << "vce_map." << "vec" << i;
        point_list = pt.get_child(ss_i.str());        
        int j = 0;
        for (auto point = point_list.begin(); point != point_list.end(); point++)
        {
            std::stringstream ss_j;
            ss_j << ".pt" << j;
            auto STR = ss_i.str() + ss_j.str();
            float x = pt.get<float>(STR + ".x");
            float y = pt.get<float>(STR + ".y");
            float z = pt.get<float>(STR + ".z");

            s_ptsMap[i]->push_back(osg::Vec3(x, y, z));
            j++;
        }
        i++;
    }
}