boost write_xml不保存attribute 备忘

Attributes in property tree are added as sub-nodes. 

property tree 属性作为子节点 (坑坑坑坑坑)

使用

write_xml_element(std::cout, pt.front().first, pt.front().second, 0, boost::property_tree::xml_writer_make_settings<std::string>(' ', 0));

1 You can use the undocumented function write_xml_element to write the single element (using the key as element name):

    // write the single element: (undocumented API)
    boost::property_tree::xml_parser::write_xml_element(
            std::cout, it->first, it->second,
            0, settings
        );
2 or you can create a new ptree object with the single child

    ptree tmp;
    tmp.add_child(it->first, it->second);
    write_xml(std::cout, tmp, settings);

#include <iostream>
#include <boost/property_tree/xml_parser.hpp>
#include <boost/property_tree/ptree.hpp>
using namespace std;

int main() {
   
auto str=R"(xmlcontent)";
using namespace boost::property_tree;
       iptree tree;
    stringstream ss;
    ss<<str;
    boost::property_tree::xml_parser::read_xml(ss,tree);
    
    
        iptree pchilds = tree.get_child("MainTask");
       // write_xml(std::cout, tree);
        for (auto pos= pchilds.begin(); pos != pchilds.end(); ++pos)
        {
            bool decode_flag = false;
            std::string name = pos->first;
            iptree tempNode = pos->second;
            if (name == "<xmlattr>") {
                
                continue;
            }
            
            if (name == "subnode") //子节点
            {
//获取所有子节点

iptree temppp;
auto& attributes = tempNode.get_child("<xmlattr>", temppp);
for(auto &v: attributes){
cout << "First: " << v.first.data() << " Second: " << v.second.data() << endl;
}

                for(auto child:tempNode.get_child("")){
                    //if( child.first == "<xmlattr>" ) {
                    //    write_xml(std::cout,child.second);
                   // write_xml_element(std::cout, child.first, child.second, 0, boost::property_tree::xml_writer_make_settings<std::string>(' ', 0));
                        write_xml_element(std::cout,ptree::key_type(),child.second,0,xml_writer_make_settings<std::string>('', 0));
                        //cout<<child.second.data()<<endl;
                  //  }
                }
                //string sss=tempNode.get("<xmlattr>", "");
                //std::cout<<tempNode.data()<<endl;
                //write_xml(std::cout,tempNode ,options);
            }
            
        }
    
    
    
    

    
}    

参考:

https://www.titanwolf.org/Network/q/d9d0c6a1-6771-4da9-985e-a7975028ebee/y

https://stackoverflow.com/questions/14010473/parsing-xml-attributes-with-boost

https://www.technical-recipes.com/2014/using-boostproperty_tree/

使用

http://www.ce.unipr.it/people/medici/boost_ptree.html

https://topic.alibabacloud.com/a/boost-ptree-operation-xml-easy-and-useful_8_8_10266710.html

关键点

https://stackoverflow.com/questions/53603392/boost-property-tree-iterating-through-attributes-of-repeated-child-elements-wit

https://stackoverflow.com/questions/16058204/omit-xml-declaration-when-saving-xml-with-boost

忽略声明

https://stackoverflow.com/questions/47448864/removing-encoding-attribute-from-xml-using-boost

https://stackoverflow.com/questions/16058204/omit-xml-declaration-when-saving-xml-with-boost

格式化

https://stackoverflow.com/questions/55980786/how-to-serialize-a-subtree-of-a-boost-property-tree-to-xml

https://stackoverflow.com/questions/35954432/how-to-get-all-child-node-values