C++ TinyXML解析案例详解

tinyxml/           //工作目录
|-- include        //头文件根目录
| 　|-- tinyxml    //tinyxml头文件，包括tinystr.h tinyxml.h
|-- src            //cpp源码文件根目录
　　|-- tinyxml       //tinyxml源码文件夹，包括tinystr.cpp tinyxml.cpp tinyxmlerror.cpp tinyxmlparser.cpp
　　|-- main.cpp   //我们的主函数，调用tinyxml的示例代码  
|-- conf            //我们示例中用的xml文件所在的文件夹
|-- makefile       //makefile，不用我们多说了吧，不懂请看我博客的makefile最佳实践

<School name="软件学院">
    
    <Class name = "C++">  
        
        <Student name="tinyxml" number="123">  
            <email>tinyxml@163.com</email>  
            <address>中国</address>           
        </Student>  
        
        <Student name="JSONcpp" number="456">  
            <email>jsoncpp@gmail.com</email>  
            <address>美国</address>           
        </Student>  
        
    </Class>  
    
</School>

void printSchoolXml() {
    using namespace std;
    TiXmlDocument doc;  
    const char * xmlFile = "conf/school.xml";   
    if (doc.LoadFile(xmlFile)) {    
        doc.Print();  
    } else {
        cout << "can not parse xml conf/school.xml" << endl;
    }   
}

void readSchoolXml() {
    using namespace std;
    const char * xmlFile = "conf/school.xml";
    TiXmlDocument doc;                              
    if (doc.LoadFile(xmlFile)) {
        doc.Print();
    } else {
        cout << "can not parse xml conf/school.xml" << endl;
        return;
    }
    
    TiXmlElement* rootElement = doc.RootElement();  //School元素  
    TiXmlElement* classElement = rootElement->FirstChildElement();  // Class元素
    TiXmlElement* studentElement = classElement->FirstChildElement();  //Students  
    
    for (; studentElement != NULL; studentElement = studentElement->NextSiblingElement() ) {
        TiXmlAttribute* attributeOfStudent = studentElement->FirstAttribute();  //获得student的name属性  
        for (;attributeOfStudent != NULL; attributeOfStudent = attributeOfStudent->Next() ) {
            cout << attributeOfStudent->Name() << " : " << attributeOfStudent->Value() << std::endl;       
        }                                 

        TiXmlElement* studentContactElement = studentElement->FirstChildElement();//获得student的第一个联系方式 
        
        for (; studentContactElement != NULL; studentContactElement = studentContactElement->NextSiblingElement() ) {
            string contactType = studentContactElement->Value();
            string contactValue = studentContactElement->GetText();
            cout << contactType  << " : " << contactValue << std::endl;           
        }   
    } 
}

void writeSchoolXml() {
    using namespace std;
    const char * xmlFile = "conf/school-write.xml"; 
    
    TiXmlDocument doc;  
    TiXmlDeclaration * decl = new TiXmlDeclaration("1.0", "", "");  
    TiXmlElement * schoolElement = new TiXmlElement( "School" );  
    TiXmlElement * classElement = new TiXmlElement( "Class" );  
    classElement->SetAttribute("name", "C++");

    TiXmlElement * stu1Element = new TiXmlElement("Student");
    stu1Element->SetAttribute("name", "tinyxml");
    stu1Element->SetAttribute("number", "123");
    TiXmlElement * stu1EmailElement = new TiXmlElement("email");
    stu1EmailElement->LinkEndChild(new TiXmlText("tinyxml@163.com") );
    TiXmlElement * stu1AddressElement = new TiXmlElement("address");
    stu1AddressElement->LinkEndChild(new TiXmlText("中国"));
    stu1Element->LinkEndChild(stu1EmailElement);
    stu1Element->LinkEndChild(stu1AddressElement);

    TiXmlElement * stu2Element = new TiXmlElement("Student");
    stu2Element->SetAttribute("name", "jsoncpp");
    stu2Element->SetAttribute("number", "456");
    TiXmlElement * stu2EmailElement = new TiXmlElement("email");
    stu2EmailElement->LinkEndChild(new TiXmlText("jsoncpp@163.com"));
    TiXmlElement * stu2AddressElement = new TiXmlElement("address");
    stu2AddressElement->LinkEndChild(new TiXmlText("美国"));
    stu2Element->LinkEndChild(stu2EmailElement);
    stu2Element->LinkEndChild(stu2AddressElement);

    classElement->LinkEndChild(stu1Element);  
    classElement->LinkEndChild(stu2Element);  
    schoolElement->LinkEndChild(classElement);  
    
    doc.LinkEndChild(decl);  
    doc.LinkEndChild(schoolElement); 
    doc.SaveFile(xmlFile);  
}

TiXmlNode node;
node.Clear();

TiXmlNode nodeA;
nodeA. RemoveChild( TiXmlNode* removeThis );

TiXmlAttribute attrA;
attrA. RemoveAttribute( const char * name );

TiXmlNode* lpnode = NULL;
lpnode = tixml.RootElement()->IterateChildren("mfid",lpnode);
TiXmlAttribute* tiattr = lpnode->ToElement()->FirstAttribute();
//找到mfid节点，获取第一个属性值。注意，如果有多个属性值，需要判断哪个属性值是需要的
tiattr->SetValue(mfid.c_str());

TiXmlNode* ReplaceChild( TiXmlNode* replaceThis, const TiXmlNode& withThis );