利用tinyXML实现xml文件的读写

转载自博客”C++中XML的读写操作（生成XML & 解析XML） - htj10 - 博客园 (cnblogs.com)“

tinyXml

 下载：https://sourceforge.net/projects/tinyxml/

解压缩tinyXML后，将这六个文件添加到你的C++工程中，

分别是

tinystr.h、

tinystr.cpp、

tinyxml.h、

tinyxml.cpp、

tinyxmlerror.cpp、

tinyxmlparser.cpp。

在需要操作xml文件的地方，使用如下代码，就可以引入TinyXML类库。

 #include<tinyxml> 或 #include "tinyxml.h"

案例

#include<iostream>
#include "../../../../Desktop/tinyxml_2_6_2/tinyxml/tinyxml.h"
using namespace std;
bool WriteXml(string);
bool ReadXml(string);
bool WriteXml1(string filePath);
bool ReadXml1(string);
int main()
{
  /* bool flag= WriteXml("D://Mytextxml2.xml");
   if (flag)
   {
       cout << "xml保存成功";
   }*/
    /*WriteXml1("D://Mytextxml3.xml");
    ReadXml("D://Mytextxml2.xml");*/
    ReadXml1("D://Mytextxml2.xml");
    return 0;
}
bool WriteXml(string filePath)
{
    try
    {
        /*
        <Persons>
            <Person ID="1" other="info">
                <name>Michael</name>
                <age>23</age>
            </Person>
        </Persons>        
        */
        TiXmlDocument* myDocument = new TiXmlDocument();
        TiXmlElement* RootElement = new TiXmlElement("Persons");
        myDocument->LinkEndChild(RootElement);
        TiXmlElement* PersonElement = new TiXmlElement("Person");
        RootElement->LinkEndChild(PersonElement);
        PersonElement->SetAttribute("ID", "1");
        PersonElement->SetAttribute("other", "info");
        TiXmlElement* NameElement = new TiXmlElement("name");
        TiXmlElement* AgeElement = new TiXmlElement("age");
        PersonElement->LinkEndChild(NameElement);
        PersonElement->LinkEndChild(AgeElement);
        TiXmlText* NameContent = new TiXmlText("Michael");
        TiXmlText* AgeContent = new TiXmlText("23");
        NameElement->LinkEndChild(NameContent);
        AgeElement->LinkEndChild(AgeContent);      
        myDocument->SaveFile(filePath.c_str());
        delete myDocument;
    }
    catch (string& e)
    {
        return false;
    }
    return true;
}
bool ReadXml(string filePath)
{
    try
    {
        TiXmlDocument *myDocument = new TiXmlDocument(filePath.c_str());//这样最后要delete myDocument
        myDocument->LoadFile();
       
        //TiXmlDocument doc;
        //doc.LoadFile("info.xml");
        //string str("<Persons>\
        //               <Person ID = '1' other = 'info'>\
        //                <name>Michael</name>\
        //                <age>23</age>\
        //            </Person>\
        //        </Persons>");
        //doc.Parse(str.c_str());//解析xml字符串
        /*TiXmlElement* RootElement = doc.RootElement();*/
        TiXmlElement* RootElement = myDocument->RootElement();
        string root = RootElement->Value();
        TiXmlElement* FirstPerson = RootElement->FirstChildElement();
        TiXmlElement* NameElement = FirstPerson->FirstChildElement();
        TiXmlElement* AgeElement = NameElement->NextSiblingElement();
        TiXmlAttribute* IDAttribute = FirstPerson->FirstAttribute();
        string name = NameElement->FirstChild()->Value();//或NameElement->GetText()
        cout << name<<endl;//Michael
        string age = AgeElement->FirstChild()->Value();//或AgeElement->GetText()
        cout << age << endl;//23
        string attrName = IDAttribute->Name();   //"ID"
        cout << attrName << endl;
        string attrValue = IDAttribute->Value(); //"1"
        cout << attrValue << endl;
        attrName = IDAttribute->Next()->Name();  //"other"
        cout << attrName << endl;
        attrValue = IDAttribute->Next()->Value();//"info"
        cout << attrValue << endl;
        //delete myDocument;
    }
    catch (string& e)
    {
        return false;
    }
    return true;
}
bool WriteXml1(string filePath)
{
    try
    {
        /*
        <?xml version="1.0" encoding="utf-8" ?>
        <!--this is a comment.-->
        <books>
            <book category="children" language="English" name="123English">
                <title>Harry Potter</title>
                <anthor>J.K. Rowling</anthor>
                <price>29.99</price>
            </book>
            <function>
                <![CDATA[bool cmp(int a,int b)
                {return a<b;}]]>
            </function>
        </books>       
        */
        TiXmlDocument* doc = new TiXmlDocument;
        TiXmlDeclaration* decl = new TiXmlDeclaration("1.0", "utf-8", "");
        doc->LinkEndChild(decl);
        TiXmlComment* pComment = new TiXmlComment("this is a comment.");//构建一条注释
        doc->LinkEndChild(pComment);

        TiXmlElement* root, * elem, * child;
        TiXmlText* text;
        root = new TiXmlElement("books");
        doc->LinkEndChild(root);

        elem = new TiXmlElement("book");
        elem->SetAttribute("category", "children");
        elem->SetAttribute("language", "English");
        elem->SetAttribute("name", "123English");//可以解出来123，但“English123”不能
        root->LinkEndChild(elem);

        child = new TiXmlElement("title");
        text = new TiXmlText("Harry Potter");
        child->LinkEndChild(text);
        elem->LinkEndChild(child);

        child = new TiXmlElement("anthor");
        text = new TiXmlText("J.K. Rowling");
        child->LinkEndChild(text);
        elem->LinkEndChild(child);

        child = new TiXmlElement("price");
        text = new TiXmlText("29.99");
        child->LinkEndChild(text);
        elem->LinkEndChild(child);

        //一个CDATA（Tixml看做是TiXmlText）
        elem = new TiXmlElement("function");
        TiXmlText* pCDATA = new TiXmlText("bool cmp(int a,int b)\n{return a<b;}");
        pCDATA->SetCDATA(true);
        elem->LinkEndChild(pCDATA);
        root->LinkEndChild(elem);

        //doc->Print();//打印到 stdout cout
        doc->SaveFile("D:\\test.xml");//输出到文件

        TiXmlPrinter printer;
        //printer.SetStreamPrinting();//有这句，无空白符，就一行字符串
        doc->Accept(&printer);
        string sRet = printer.CStr();//输出到字符串

        delete doc;//只需要这一个delete，它的所有子节点都delete了
               
    }
    catch (std::string& e)
    {
        return false;
    }
}

bool ReadXml1(string filePath)
{
    //解析
    //string sXml = sRet;
    TiXmlDocument doc;
    ////解析xml字符串
    //doc.Parse(sXml.c_str());
    //if (doc.Error())
    //    return false;
    //解析xml文件
    if (!doc.LoadFile("D:\\test.xml"))
        return false;
    TiXmlElement* root = doc.RootElement();
    TiXmlElement* elem = root->FirstChildElement();
    //遍历
    for (TiXmlElement* tmp = elem->FirstChildElement(); tmp; tmp = tmp->NextSiblingElement())
    {
        string s = tmp->Value();
        cout << s << endl;;
        const char* p = tmp->GetText();
        string t(p ? p : "");
       
        cout << t << endl;
    }
    //查找特定name的元素
    TiXmlElement* elem2 = root->FirstChildElement("book");
    //遍历Attribute
    for (TiXmlAttribute* pAttr = elem2->FirstAttribute(); pAttr; pAttr = pAttr->Next())
    {
        string sName = pAttr->Name();
        cout << sName << endl;
        string sValue = pAttr->Value();
        cout << sValue << endl;
    }
    //获取特定attribute
    const char* psz1 = elem2->Attribute("language");//"English"
    const char* psz2 = elem2->Attribute("category");//"children",若没有找到"category"属性，则返回NULL
    cout << psz1 << "--" << psz2 << endl;
    //还有，直接取值的
    int i;
    elem2->Attribute("name", &i);//返回const char* , 失败返回NULL
    cout << i << endl;//输出123
    double d;
    elem2->Attribute("name", &d);
    cout << d << endl;
    elem2->QueryIntAttribute("name", &i);
    cout << i << endl;
    elem2->QueryDoubleAttribute("name", &d);
    cout << d << endl;
    bool b;
    elem2->QueryBoolAttribute("name", &b);
    cout << b << endl;
    //...

    //获取CDATA
    TiXmlElement* elem3 = root->FirstChildElement("function");
    string ss = elem3->GetText();
    string ss2 = elem3->FirstChild()->Value();//或者
}