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  • pugixml 自己用的xpath

    这两天接触了一个c++编写的xml解析库——pugixml,能解析xml内容,支持xpath解析,且能跨linux平台,不错!以前一直习惯用CMarkup,主要用它读写xml配置文件,但CMarkup不支持xpath,也只能在windows用,虽然习惯了CMarkup,不过若需要xpath解析,又需要跨linux平台,相比之下,pugixml确实是很好的选择,操作速度也快。学习文档:http://pugixml.googlecode.com/svn/tags/latest/docs/quickstart.html , 总结一下使用步骤和简单的使用方法:

    (1)使用pugixml库需要三个文件:pugiconfig.h/pugixml.h/pugixml.cpp,可直接从gugixml官网下载,将其加入工程,使用处包含头文件pugiconfig.h/pugixml.h即可。

    (2)加载xml文件,使用xml_document类的load_file接口:
        std::strFile = "../test.xml";
        pugi::xml_document doc;
        if (!doc.load_file(strFile.c_str())) 
        {  //return -1;}

    (3)加载xml格式的字符串,使用xml_document类的load接口:
        std::strText = "****";
        pugi::xml_document doc;
        if (!doc.load(strText.c_str())) 
        {  //return -1;}

    (4)xml节点读取,如xml文件params.xml:
        <?xml version="1.0" encoding="utf-8" ?>  
       <root> 
        <!-- 输入参数配置 --> 
        <form ip="10.2.134.243" port="80" action="sisserver.php"> 
        <input name="data_type" value="POI" /> 
        <input name="query_type" value="TQUERY" /> 
        <input name="category" value="" /> 
     
        <!-- 查询词的返回结果xpath配置 --> 
        <xpath poiroot="//list/poi" idfield="pguid" namefield="name"/> 
        <!-- 评分权重配置 r1~r4-期望结果的权重,n1~n10-实际查询结果的排名权重--> 
        <weight> 
         <!-- 查询词正常得分阀值 --> 
         <threshold>3</threshold> 
         <!-- 计算分数分布情况的步长值 --> 
         <step>0.5</step> 
        </weight> 
      </root>
        读取代码:
        std::string strFile = "/bak/workspace/test/src/params.xml";
        pugi::xml_document doc;
        if (!doc.load_file(strFile.c_str())) 
        {return 0;}
        pugi::xml_node form = doc.child("root").child("form");
        std::string ip = form.attribute("ip").value();
        std::string port = form.attribute("port").value();
       
        char cBuf[2083];
        sprintf(cBuf, "http://%s:%s/%s?", ip.c_str(), port.c_s());
        std::string strTemp(cBuf);
        std::string m_strURLBase = strTemp;

        for (pugi::xml_node input = form.first_child(); input;
             input = input.next_sibling())
        {
        std::string strValue = input.attribute("value").value();
        if (!strValue.empty()) 
            {
        std::string strName = input.attribute("name").value();
        sprintf(cBuf, "%s=%s&", strName.c_str(), strValue.c_str());
        std::string strTemp(cBuf);
        m_strURLBase += strTemp;
        }
        }
        
        //读取xpath
        pugi::xml_node xpath = doc.child("root").child("xpath");
        std::string m_strPOIRoot = xpath.attribute("poiroot").value();
        std::string m_strPOIID = xpath.attribute("idfield").value();

        //读取评分权重
        pugi::xml_node weight = doc.child("root").child("weight");
        float m_fThred = atof(weight.child_value("threshold"));
        float m_fStep = atof(weight.child_value("step"));

    (5)xpath解析,如xml格式的字符串strWebContent:
     <?xml version="1.0" encoding="utf-8" ?>  
       <root> 
        <list count="3" time"10"> 
        <poi>
           <pguid>123</pguid>
           <name>xx1</name>
        </poi> 
        <poi>
           <pguid>456</pguid>
           <name>xx2</name>
        </poi> 
        <poi>
           <pguid>789</pguid>
           <name>xx3</name>
        </poi> 
        </list> 
      </root>
      其中,xpath根路径:m_strPOIRoot="//list/poi", 
      需要取值的项:strPOIID=“pguid”,strPOINam=“name”。

      读取代码:
      //从strWebContent内容中解析出pguid和name
      pugi::xml_document doc;
      pugi::xml_parse_result result = doc.load(strWebContent.c_str());
      if (!result)
      {return -1;}
      pugi::xpath_node_set tools = doc.select_nodes(m_strPOIRoot.c_str());
      for (pugi::xpath_node_set::const_iterator it = tools.begin(); 
          it !=  tools.end(); ++it)
      {
         pugi::xpath_node node = *it;
         string strPOI = node.node().child_value(m_strPOIID.c_str());
         string strName = node.node().child_value(m_strPOIName.c_str());

      }


    /////////////////////////////////////////////////////////////

    pugi::xml_document doc;

    if (!doc.load_file("E:\code\windows\iQSMgr\debug\xgconsole.xml"))
    {
    return ;
    }
    // Select nodes via compiled query
    pugi::xpath_query query_remote_tools("/bookstore/book");



    pugi::xpath_node_set tools = doc.select_nodes("/bookstore/book");


    int n = tools.size();
    std::string m_strNameAtt = "title";
    std::string m_strNameAtt1 = "price";


    for (pugi::xpath_node_set::const_iterator it = tools.begin(); it != tools.end(); ++it)
    {
    pugi::xpath_node node = *it;
    std::string strPOI = node.node().child_value(m_strNameAtt.c_str());
    std::string strName = node.node().child_value(m_strNameAtt1.c_str());
    }
    /////////////////////////////////////////////////////////////



    等待实现

    ///////////////////////////////////////

    pugi::xml_document doc;

    ///////////////////
        if (!doc.load_file("xgconsole.xml")) return -1;


        pugi::xml_node tools = doc.child("Profile").child("Tools");


        //[code_traverse_base_basic
        for (pugi::xml_node tool = tools.first_child(); tool; tool = tool.next_sibling())
        {
            std::cout << "Tool:";


            for (pugi::xml_attribute attr = tool.first_attribute(); attr; attr = attr.next_attribute())
            {
                std::cout << " " << attr.name() << "=" << attr.value();
            }


            std::cout << std::endl;
        }
    //]

    //////////////////////////////

    <?xml version="1.0" encoding="UTF-8" standalone="no" ?>
    <Profile FormatVersion="1">
        <Tools>
            <Tool Filename="jam" AllowIntercept="true">
            <Description>Jamplus build system</Description>
            </Tool>
            <Tool Filename="mayabatch.exe" AllowRemote="true" OutputFileMasks="*.dae" DeriveCaptionFrom="lastparam" Timeout="40" />
            <Tool Filename="meshbuilder_*.exe" AllowRemote="false" OutputFileMasks="*.mesh" DeriveCaptionFrom="lastparam" Timeout="10" />
            <Tool Filename="texbuilder_*.exe" AllowRemote="true" OutputFileMasks="*.tex" DeriveCaptionFrom="lastparam" />
            <Tool Filename="shaderbuilder_*.exe" AllowRemote="true" DeriveCaptionFrom="lastparam" />
        </Tools>
    </Profile>

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  • 原文地址:https://www.cnblogs.com/eaglezzb/p/4176458.html
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