Parsing XML Attributes with Boost

Question

I would like to share with you an issue I\'m having while trying to process some attributes from XML elements in C++ with Boost libraries (version 1.52.0). Given the followi

Answer 1

The problem with your program is located in this line:

const ptree & attributes = formats.get_child(at, empty_ptree());

With this line you are asking to get the child pet. from pets and you do this 3 times independently of whichever f you are traversing. Following this article I'd guess that what you need to use is:

const ptree & attributes = f.second.get_child("", empty_ptree());

The full code, that works with both your xml files, is:

#define ATTR_SET "."
#define XML_PATH1 "./pets.xml"

#include 
#include 
#include 
#include 
#include 

using namespace std;
using namespace boost;
using namespace boost::property_tree;

const ptree& empty_ptree(){
    static ptree t;
    return t;
}

int main() {
    ptree tree;
    read_xml(XML_PATH1, tree);
    const ptree & formats = tree.get_child("pets", empty_ptree());
    BOOST_FOREACH(const ptree::value_type & f, formats){
        string at = f.first + ATTR_SET;
        const ptree & attributes = f.second.get_child("", empty_ptree());
        cout << "Extracting attributes from " << at << ":" << endl;
        BOOST_FOREACH(const ptree::value_type &v, attributes){
            cout << "First: " << v.first.data() << " Second: " << v.second.data() << endl;
        }
    }
}