c++ - Using vertex_name when reading a GraphML file with Boost Graph -

i trying load simple graphml file such each vertex has vertex name stored in graphml. can change graphml, important thing have access vertex_name code afterwards.

here's minimal example extract still shows problem:

#include <iostream> #include <string> #include <fstream>  #include <boost/graph/adjacency_list.hpp> #include <boost/graph/graphml.hpp>  int main() {     using namespace boost;     typedef adjacency_list<vecs, vecs, directeds,property<vertex_name_t,std::string> > boostgraphtype;     typedef dynamic_properties boostdynamicproperties;      std::string fn = "simple.graphml";     std::ifstream is(fn.c_str());      if (!is.is_open())     {         std::cout << "loading file '" << fn << "'failed." << std::endl;         throw "could not load file.";     }      boostgraphtype g;     boostdynamicproperties dp ;     const std::string vn = "vertex_name";     dp.property(vn,get(vertex_name,g));     read_graphml(is, g, dp);      (auto vp = vertices(g); vp.first != vp.second; ++vp.first)     {         std::cout << "index '" << get(vertex_index,g,*vp.first) << "' ";         std::cout << "name '" << get(vertex_name,g,*vp.first) << "'"         << std::endl;     }      return 0; } 

i using the following graphml test file:

<?xml version="1.0" encoding="utf-8"?> <graphml xmlns="http://graphml.graphdrawing.org/xmlns"       xmlns:xsi="http://www.w3.org/2001/xmlschema-instance"     xsi:schemalocation="http://graphml.graphdrawing.org/xmlns     http://graphml.graphdrawing.org/xmlns/1.0/graphml.xsd">   <key id="d0" for="node" attr.name="vertex_name" attr.type="string"/>   <graph id="g" edgedefault="directed">     <node id="a"> <data key="d0">a</data> </node>     <node id="b"> <data key="d0">b</data> </node>     <edge id="0" source="a" target="b"/>    </graph> </graphml> 

read_graphml throws exception helpful message (e.what()):

 parse error: unrecognized type "    

it seems problem related vertex_name association (which got comment previous question of mine).

if remove

<data key="d0">a</data> 

from node, works.

however, need able identify vertices vertex_name.

how can fix parses graphml , not throw? doing wrong?

your code works when run it.

>wilbert.exe index '0' name 'a' index '1' name 'b' 

this using boost v1.52 on windows 7