C++解析XML,TINYXML2的使用

学习使用tinyxml2&＃xff0c;参考https://www.cnblogs.com/happykoukou/p/6307257.html&＃xff0c;以及官方tinyxml2的test。主要知识&＃xff1a;XMLDocument doc;//创建一个dom对象
doc.LoadFile();
doc.Parse(); //将字符串转为dom对象
auto key &＃61; doc.NewElement(const char* keyName);//创建一个key
doc.NewText(const char*);//创建一个value
InsertEndChild(key)
FirstChildElement(const char*);
GetText();
SetText(const char*);
NextSiblingElement();//兄弟节点
country.hpp#pragma once//删除指针
#define SAFE_DELETE(pRet) if(pRet !&＃61; NULL) {delete pRet;pRet &＃61; NULL;}
//检查xml中的键是否存在&＃xff0c;xml的结构已知&＃xff0c;若不存在&＃xff0c;直接退出
#define KEY_IS_NULL(key) if(key &＃61;&＃61; nullptr){printf("%s is not found\n",#key);exit(-1);}//为了简单化&＃xff0c;以下几个类全部成员函数为public
class Province;
class City;class City
{
public:std::string name;City(const std::string &name):name(name){}
};class Province
{
public:std::string name;std::vector vCities;Province(const std::string &name):name(name){}Province(){}
};class Country
{
public:std::string name;std::vector vProvinces;public:Country(const std::string &name):name(name){}Country(){}/*** 将本类的成员变量序列化到一个固定格式的xml文件中* 采用模板&＃xff0c;可以不需要写 tinyxml2的头文件*/templateint parseXML(T &doc, const std::string &fileName){//xml头//R"(string)", string可以以原来的形式存在&＃xff0c;“” 不需要转义符const char *declaration &＃61; R"()";//将字符串解析到dom对象中doc.Parse(declaration);//new 一个 key//序列化std::string name;auto roof &＃61; doc.NewElement("country");auto keyCountryName &＃61; doc.NewElement("name");//插入valuekeyCountryName->InsertEndChild(doc.NewText(name.c_str()));//插入roof->InsertEndChild(keyCountryName);doc.InsertEndChild(roof);//序列化std::vector vProvinces;for(auto province : vProvinces){auto keyProvince &＃61; doc.NewElement("province");roof->InsertEndChild(keyProvince);auto keyProvinceName &＃61; doc.NewElement("name");keyProvinceName->InsertEndChild(doc.NewText(province.name.c_str()));keyProvince->InsertEndChild(keyProvinceName);auto keyCities &＃61; doc.NewElement("cities");keyProvince->InsertEndChild(keyCities);//序列化std::vector vCities;for(auto city : province.vCities){auto keyCity &＃61; doc.NewElement("city");keyCity->InsertEndChild(doc.NewText(city.name.c_str()));keyCities->InsertEndChild(keyCity);}}//保存为xml文件return doc.SaveFile(fileName.c_str());}//反序列化xml文件成一个对象templateint convertXMLToObject(T &doc, const std::string &fileName){int ret &＃61; doc.LoadFile(fileName.c_str());if(ret){return ret;}//查找key&＃xff0c;如果不存在&＃xff0c;则退出程序。auto keyCountry &＃61; doc.FirstChildElement("country");KEY_IS_NULL(keyCountry);auto keyCountryName &＃61; keyCountry->FirstChildElement("name");KEY_IS_NULL(keyCountryName);auto countryName &＃61; keyCountryName->GetText();if(countryName &＃61;&＃61; nullptr){return -1;}this->name &＃61; countryName;auto keyProvince &＃61; keyCountry->FirstChildElement("province");//反序列化std::vector vProvinces;while(keyProvince !&＃61; nullptr){ auto keyProvinceName &＃61; keyProvince->FirstChildElement("name");KEY_IS_NULL(keyProvinceName);auto provinceName &＃61; keyProvinceName->GetText();if(provinceName !&＃61; nullptr){Province province(provinceName);auto keyCities &＃61; keyProvince->FirstChildElement("cities");KEY_IS_NULL(keyCities);auto keyCity &＃61; keyCities->FirstChildElement("city");KEY_IS_NULL(keyCity);//反序列化std::vector vCities;while(keyCity !&＃61; nullptr){auto cityName &＃61; keyCity->GetText();if(cityName !&＃61; nullptr){City city(cityName);province.vCities.push_back(city);}//继续查找兄弟节点keyCity &＃61; keyCity->NextSiblingElement(); }this->vProvinces.push_back(province);}//继续查找兄弟节点keyProvince &＃61; keyProvince->NextSiblingElement();}return 0; }//序列化对象到stringstd::string toString(){std::string s; if(!name.empty()){s&＃43;&＃61; "country name: ";s&＃43;&＃61; name;}if(!vProvinces.empty()){for(auto province : vProvinces){s&＃43;&＃61; " province name :";s&＃43;&＃61; province.name;if(!province.vCities.empty()){s&＃43;&＃61; " city name: ";for(auto city : province.vCities){s&＃43;&＃61; city.name;s&＃43;&＃61; " ";}}}}return s;}};
test.cpp#include
#include
#include
#include
#include "../tinyxml2.h"#include "country.hpp"using namespace tinyxml2;
using namespace std;#define EXIT_ABNOEMAL(msg) {printf("%s\n", msg); return -1;}//构造一个country
Country* getCountry(const string &name)
{auto country &＃61; new Country(name);City haerbing("哈尔滨");City daqing("大庆");Province heilongjing("黑龙江");heilongjing.vCities.push_back(haerbing);heilongjing.vCities.push_back(daqing);City guangzhou("广州");City shenzhen("深圳");City zhuhai("珠海");Province guangdong("广东");guangdong.vCities.push_back(guangzhou);guangdong.vCities.push_back(shenzhen);guangdong.vCities.push_back(zhuhai);City taibei("台北");City gaoxiong("高雄");Province taiwan("台湾");taiwan.vCities.push_back(gaoxiong);taiwan.vCities.push_back(taibei);City wulumuqi("乌鲁木齐");Province xinjiang("新疆");xinjiang.vCities.push_back(wulumuqi);country->vProvinces.push_back(xinjiang);country->vProvinces.push_back(heilongjing);country->vProvinces.push_back(guangdong);country->vProvinces.push_back(taiwan);return country;
}//序列化对象到xml
int parseCountryToXml(Country *country, const string &filePath)
{XMLDocument doc;//调用country的序列化函数int ret &＃61; country->parseXML(doc, filePath);return ret;
}//反序列化到对象
int readXMLToCountry(Country * country, const string &filePath)
{XMLDocument doc;//调用对象的反序列花方法int ret &＃61; country->convertXMLToObject(doc, filePath);return ret;
}int main()
{const string fileName &＃61; "../test/country.xml";//将中国对象保存到xml中auto zhongguo &＃61; getCountry("zhongguo");int ret;ret &＃61; parseCountryToXml(zhongguo, fileName);if(ret){EXIT_ABNOEMAL("convert to xml error!");}//从上面的xml中反序列化成china对象Country *china &＃61; new Country();ret &＃61; readXMLToCountry(china, fileName);if(ret){EXIT_ABNOEMAL("convert to Object error!");}//输出china对象string s &＃61; china->toString();cout<}
结果&＃xff1a;country.xml
zhongguo新疆乌鲁木齐黑龙江哈尔滨大庆广东广州深圳珠海台湾高雄台北