c++ - 无法使用 boost::read_graphml 读取 graphML

Question

我正在使用 boost 版本 1.64 并尝试使用 boost::read_graphml 读取一个 graphml 文件。代码编译但在运行时抛出异常:

在抛出“boost::exception_detail::clone_impl >”实例后调用终止
what(): 解析错误:无法识别键的类型“”中止(核心转储)

test.cpp

#include <boost/graph/graph_utility.hpp>
#include <boost/property_map/property_map.hpp>
#include <boost/property_map/dynamic_property_map.hpp>
#include <boost/graph/adjacency_list.hpp>
#include <boost/graph/graphml.hpp>
#include <fstream>

struct GraphData {
    std::string Name;
};
struct VertexProperty
{
    std::string Name ;
};

struct EdgeProperty
{
    std::string Name ;
};

using Graph = boost::adjacency_list<boost::setS, boost::vecS, boost::directedS, GraphData>;

Graph ReadGraph(std::string const& fileName) {
    Graph graph;
    boost::dynamic_properties dp;
    dp.property("Name", boost::get(&GraphData::Name, graph));

    std::ifstream file(fileName);
    boost::read_graphml(file, graph, dp);

    return graph;
}

int main() {
    Graph g = ReadGraph("111.graphml");
    print_graph(g, get(&GraphData::Name, g));

}

111.graphml

<?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="key0" for="node" attr.name="Name" attr.type="string" />
  <graph id="G" edgedefault="directed" parse.nodeids="canonical" parse.edgeids="canonical" parse.order="nodesfirst">
    <node id="n0">
      <data key="key0">A</data>
    </node>
    <node id="n1">
      <data key="key0">D</data>
    </node>
    <node id="n2">
      <data key="key0">B</data>
    </node>
    <node id="n3">
      <data key="key0">C</data>
    </node>
    <edge id="e0" source="n0" target="n1">
    </edge>
    <edge id="e1" source="n2" target="n3">
    </edge>
  </graph>
</graphml>

感谢对此的任何帮助!!!

Answer 1

我无法使用显示的代码/xml 重现:

• 海湾合作委员会 7.3 https://wandbox.org/permlink/HIWgRScfrA0su9dS
• 叮当 6 https://wandbox.org/permlink/DqkHS3UshUKW4Rsq
• 海湾合作委员会 5.1 https://wandbox.org/permlink/vxtxvLYzA97KbBS6

但是我确实注意到您在对应于 Vertex 属性包的位置使用 GraphData。

也许你想要

using Graph = boost::adjacency_list<boost::setS, boost::vecS, 
   boost::directedS, VertexProperty, EdgeProperty, GraphData>;

然后使用 boost::get(&VertexProperty::Name, graph) 代替 GraphData 属性。

更进一步的猜测是，您可能希望指示 graphml 解析器忽略任何未映射的外来属性:

boost::dynamic_properties dp(boost::ignore_other_properties);

Live On Coliru

#include <boost/graph/adjacency_list.hpp>
#include <boost/graph/graph_utility.hpp>
#include <boost/graph/graphml.hpp>
#include <boost/property_map/dynamic_property_map.hpp>
#include <boost/property_map/property_map.hpp>
#include <fstream>

struct GraphData { std::string Name; };
struct VertexProperty { std::string Name; };
struct EdgeProperty { std::string Name; };

using Graph = boost::adjacency_list<boost::setS, boost::vecS, boost::directedS, VertexProperty, EdgeProperty, GraphData>;

Graph ReadGraph(std::istream& is) {
    Graph graph;
    boost::dynamic_properties dp(boost::ignore_other_properties);
    dp.property("Name", boost::get(&VertexProperty::Name, graph));

    boost::read_graphml(is, graph, dp);

    return graph;
}

extern std::string const graphml_111;

int main() {
    std::istringstream is(graphml_111);
    Graph g = ReadGraph(is);
    print_graph(g, get(&VertexProperty::Name, g));
}

std::string const graphml_111 = R"(<?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="key0" for="node" attr.name="Name" attr.type="string" />
  <graph id="G" edgedefault="directed" parse.nodeids="canonical" parse.edgeids="canonical" parse.order="nodesfirst">
    <node id="n0">
      <data key="key0">A</data>
    </node>
    <node id="n1">
      <data key="key0">D</data>
    </node>
    <node id="n2">
      <data key="key0">B</data>
    </node>
    <node id="n3">
      <data key="key0">C</data>
    </node>
    <edge id="e0" source="n0" target="n1">
    </edge>
    <edge id="e1" source="n2" target="n3">
    </edge>
  </graph>
</graphml>)";

打印

A --> D 
D --> 
B --> C 
C -->