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>
    
    <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="" />

    
    <xpath poiroot="//list/poi" idfield="pguid" namefield="name"/>
    
    <weight>
     
     <threshold>3</threshold>
     
     <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>