Pugixml C++ parsing XML - c++

Question

I am a newbie in pugixml. Consider I have XML given here. I want to get value of Name and Roll of Every Student. The code below only find the tag but not the value.
#include <iostream>
#include "pugixml.hpp"
int main()
{
std::string xml_mesg = "<data> \
<student>\
<Name>student 1</Name>\
<Roll>111</Roll>\
</student>\
<student>\
<Name>student 2</Name>\
<Roll>222</Roll>\
</student>\
<student>\
<Name>student 3</Name>\
<Roll>333</Roll>\
</student>\
</data>";
pugi::xml_document doc;
doc.load_string(xml_mesg.c_str());
pugi::xml_node data = doc.child("data");
for(pugi::xml_node_iterator it=data.begin(); it!=data.end(); ++it)
{
for(pugi::xml_node_iterator itt=it->begin(); itt!=it->end(); ++itt)
std::cout << itt->name() << " " << std::endl;
}
return 0;
}
I want the output of Name and Roll for each student. How can I modify above code? Also, if one can refer here(press Test), I can directly write xpath which is supported by pugixml. If so, how can I get the values I seek using Xpath in Pugixml.

Answer 1

Here's how you can do it with just Xpath:
pugi::xpath_query student_query("/data/student");
pugi::xpath_query name_query("Name/text()");
pugi::xpath_query roll_query("Roll/text()");
pugi::xpath_node_set xpath_students = doc.select_nodes(student_query);
for (pugi::xpath_node xpath_student : xpath_students)
{
// Since Xpath results can be nodes or attributes, you must explicitly get
// the node out with .node()
pugi::xml_node student = xpath_student.node();
pugi::xml_node name = student.select_node(name_query).node();
pugi::xml_node roll = student.select_node(roll_query).node();
std::cout << "Student name: " << name.value() << std::endl;
std::cout << " roll: " << roll.value() << std::endl;
}

Answer 2

I think that the reason why you are getting the "tags/nodes" instead of their values is because you are using the name() function instead of value(). Try replacing your itt->name() with itt->value() instead.
I found some good documentation about accessing document data here

Answer 3

Thanks #Cornstalks for the insight of using xpath in pugixml. I used child_value given here. The code of mine was thus:
for(pugi::xml_node_iterator it=data.begin(); it!=data.end(); ++it)
{
for(pugi::xml_node_iterator itt=it->begin(); itt!=it->end(); ++itt)
std::cout << itt->name() << " " << itt->child_value() << " " << std::endl;
}
I could also use xpath as #Cornstalks suggested thus making my code as:
pugi::xml_document doc;
doc.load_string(xml_mesg.c_str());
pugi::xpath_query student_query("/data/student");
pugi::xpath_query name_query("Name/text()");
pugi::xpath_query roll_query("Roll/text()");
pugi::xpath_node_set xpath_students = doc.select_nodes(student_query);
for (pugi::xpath_node xpath_student : xpath_students)
{
// Since Xpath results can be nodes or attributes, you must explicitly get
// the node out with .node()
pugi::xml_node student = xpath_student.node();
pugi::xml_node name = student.select_node(name_query).node();
pugi::xml_node roll = student.select_node(roll_query).node();
std::cout << "Student name: " << name.value() << std::endl;
std::cout << " roll: " << roll.value() << std::endl;
}

Answer 4

In your inner loop change the following line to get the values like :
student1 and 111 and so on...
std::cout << itt.text().get() << " " << std::endl;