Boost property tree xml parsing No such node () - c++

Question

I'm trying to parse an XML file using the boost/propert_tree library. I can get the xml file correctly and everything, but when I look for childs, it doesn't find any.
I have an input.xml file:
<ax:hello someatribute:ax="dwadawfesfjsefs">
<something>523523</something>
<ax:whatever>
<ax:service_tree>
<ax:service>some</ax:service>
<ax:url>someulr</ax:url>
</ax:service_tree>
</ax:whatever>
</ax:hello>
The function where I try to parse the xml:
void parseXml(std::istream &stream)
{
using boost::property_tree::ptree;
ptree pt;
read_xml(stream, pt);
BOOST_FOREACH(ptree::value_type const &value, pt.get_child("ax:hello"))
{
std::cout << value.first;
}
}
And the main function:
int main()
{
std::ifstream stream("input.xml");
parseXml(stream);
return 0;
}
The error message I get is:
terminate called after throwing an instance of 'boost::exception_detail::clone_impl >'
what(): No such node (ax:hello)
Aborted (core dumped)`
As you can see, the ax:hello tag is properly opened and closed, so it should be able to find it despite the attributes, right?
Hope someone knows what's going on in here!

Answer 1

You're doing something else wrong/different:
Live On Coliru
#include <iostream>
#include <fstream>
#include <boost/property_tree/xml_parser.hpp>
#include <boost/foreach.hpp>
void parseXml(std::istream &stream)
{
using boost::property_tree::ptree;
ptree pt;
read_xml(stream, pt);
BOOST_FOREACH(ptree::value_type const &value, pt.get_child("ax:hello"))
{
std::cout << value.first << "\n";
}
}
int main()
{
std::istringstream stream(R"(
<ax:hello someatribute:ax="dwadawfesfjsefs">
<something>523523</something>
<ax:whatever>
<ax:service_tree>
<ax:service>some</ax:service>
<ax:url>someulr</ax:url>
</ax:service_tree>
</ax:whatever>
</ax:hello>
)");
parseXml(stream);
}
Prints
<xmlattr>
something
ax:whatever
Somewhat more elaborate dumping:
void dump(ptree const& pt, std::string const& indent = "") {
for (auto& node : pt) {
std::cout << indent << node.first;
auto value = boost::trim_copy(node.second.get_value(""));
if (!value.empty())
std::cout << ": '" << value << "'";
std::cout << "\n";
dump(node.second, indent + " ");
}
}
Prints Live On Coliru too
ax:hello
<xmlattr>
someatribute:ax: 'dwadawfesfjsefs'
something: '523523'
ax:whatever
ax:service_tree
ax:service: 'some'
ax:url: 'someulr'