c++使用rapidxml

首先到RapidXML官网下载源码，把rapidxml.hpp，rapidxml_iterators.hpp，rapidxml_print.hpp，rapidxml_utils.hpp文件复制到自己的项目中就可以了

1、读取xml文件
原文件的内容如下

<?xml version="1.0" encoding="UTF-8" ?><document>222222222    <English name="name1" value="value">The world has many languages</English>    <Heavy>changshuhang;</Heavy>    <csh>Umlaut Element</csh>    <English1 name="name11" value="value1">The world has many langquagesq</English>    <English2 name="name12" value="val5ue">The world has many languagesq7</English>    <English3 name="name13" value="valu23e">The world has many languages1</English>    <English4 name="name14" value="val4ue">The world has many languages2</English>    <English5 name="name15" value="val7ue">The world has many languages3</English>    <English6 name="name17" value="va6lue">The world has many languages4</English>    <English7 name="name18" value="val9ue">The world has many languages5</English>    <English8 name="name19" value="val8ue">The world has many languages6</English>    <phonebook>          <!--one item behalfs one contacted person.-->          <item>              <name>miaomaio</name>              <addr>Shaanxi Xi'an</addr>              <tel>13759911917</tel>              <email>[e-mail]</email>              </item>          <item>              <name>gougou</name>              <addr>Liaoning Shenyang</addr>              <tel>15840330481</tel>              <email>[e-mail]</email>          </item>          <!--more contacted persons.-->      </phonebook></document>

读取xml文件并显示出来

file<> fdoc("E://demo.xml");    //std::cout << fdoc.data() << std::endl;    xml_document<> doc;           // character type defaults to char    doc.parse<0>(fdoc.data());    // 0 means default parse flags    //cout << doc << endl;    psln(doc.name());    try {        doc.parse<0>((char*)fdoc.data());   //会改变参数的内容,tmpbuf的生命周期必须到解析完      }    catch (rapidxml::parse_error &e) {        err = "parse xml error. ";        err += e.what();        psln(err);        while(1);    }    //获取document    xml_node<>* root = doc.first_node();    psln(root->name());visitorAll(root);

方法，使用递归的方法全部显示出来

//遍历所有的node文件void visitorAll(xml_node<>* root){    xml_node<>* English = root->first_node();    cout << "-----------------------" << endl;    psln(English->name());    //遍历node    for (; English; English = English->next_sibling())    {        if (English->value_size() == NULL)        {            visitorAll(English);        }        else        {            cout << "####################" << endl;            log(English->name(), English->value());            xml_attribute<>* attribute = English->first_attribute();            //遍历attr            for (; attribute; attribute = attribute->next_attribute())            {                log(attribute->name(), attribute->value());            }        }    }}

2、生成并保存xml文件

//生成xml文件并保存void save(const char * path){    xml_document<> document;    xml_node<>* rot = document.allocate_node(rapidxml::node_pi, document.allocate_string("xml version='1.0' encoding='utf-8'"));    document.append_node(rot);    //生成根节点    xml_node<>* root = document.allocate_node(node_element, "document", NULL);    document.append_node(root);    //生成节点    xml_node<>* English = document.allocate_node(node_element, "English", "The world has many languages");    xml_attribute<>* att = document.allocate_attribute("name", "name1");    English->append_attribute(att);    xml_attribute<>* att1 = document.allocate_attribute("value", "value123");    English->append_attribute(att1);    root->append_node(English);    //生成一个array节点    xml_node<>* phonebook = document.allocate_node(node_element, "phonebook", NULL);    for (int i = 0; i < 3; i++)    {        xml_node<>* item = document.allocate_node(node_element, "item", NULL);        //name        xml_node<>* name = document.allocate_node(node_element, "name", "miaomaio");        item->append_node(name);        //addr        xml_node<>* addr = document.allocate_node(node_element, "addr", "Shaanxi Xi'an");        item->append_node(addr);        //tel        xml_node<>* tel = document.allocate_node(node_element, "tel", "13759911917");        item->append_node(tel);        //email        xml_node<>* email = document.allocate_node(node_element, "name", "[e-mail]");        item->append_node(email);        phonebook->append_node(item);    }    root->append_node(phonebook);    std::ofstream out(path);    out << document;}

生成后的样式如下

<?xml version='1.0' encoding='utf-8' ?><document>    <English name="name1" value="value123">The world has many languages</English>    <phonebook>        <item>            <name>miaomaio</name>            <addr>Shaanxi Xi&apos;an</addr>            <tel>13759911917</tel>            <name>[e-mail]</name>        </item>        <item>            <name>miaomaio</name>            <addr>Shaanxi Xi&apos;an</addr>            <tel>13759911917</tel>            <name>[e-mail]</name>        </item>        <item>            <name>miaomaio</name>            <addr>Shaanxi Xi&apos;an</addr>            <tel>13759911917</tel>            <name>[e-mail]</name>        </item>    </phonebook></document>

3、修改xml文件

xml_node<>* delnode = root->first_node("English");    xml_node<>* mynode = doc.allocate_node(node_element, "address", "河北");    root->insert_node(delnode, mynode);    root->remove_node(delnode);//先删除address节点