使用pugixml创建并解析XML

╰半橙微兮° 2022-06-06 07:47 486阅读 0赞

# 创建并读取如下xml文件： #

<?xml version="1.0" encoding="utf-8"?>
    <Students>
    	
    	<Student id="1">
    		<Name>MaZhe</Name>
    		<Age>18</Age>
    	</Student>
    	<Student id="2">
    		<Name>Miki</Name>
    		<Age>19</Age>
    	</Student>
    	<Student id="3">
    		<Name>Maki</Name>
    		<Age>20</Age>
    	</Student>
    </Students>

# 代码实现： #

#include <iostream>
    #include <string>
    #include <vector>
    #include <list>
    
    #include "pugixml.hpp"
    
    static const char* kFileName = "students2.xml";
    
    struct Student {
      int id;
      std::string name;
      int age;
    
      Student(int id_, const std::string& name_, int age_)
          : id(id_)
          , name(name_)
          , age(age_) {
      }
    
      void Print() const {
        std::cout << "Id: " << id << ", Name: " << name << ", Age: " << age << std::endl;
      }
    };
    
    using namespace std;
    
    // 创建XML。
    static void WriteData() {
      // Prepare data.
      std::list<Student> students;
      students.push_back(Student(1, "MaZhe", 18));
      students.push_back(Student(2, "Miki", 19));
      students.push_back(Student(3, "Maki", 20));
    
      // Serialization.
      pugi::xml_document xdoc;
    
      pugi::xml_node xdec = xdoc.prepend_child(pugi::node_declaration);
      xdec.append_attribute("version").set_value("1.0");
      xdec.append_attribute("encoding").set_value("utf-8");
    
      pugi::xml_node xstudents = xdoc.append_child("Students");
      xstudents.append_child(pugi::node_comment).set_value("Students!");
    
      for (const Student& student : students) {
        pugi::xml_node xstudent = xstudents.append_child("Student");
    
        pugi::xml_attribute xstudent_id = xstudent.append_attribute("id");
        xstudent_id.set_value(student.id);
    
        pugi::xml_node xname = xstudent.append_child("Name");
        xname.append_child(pugi::node_pcdata).set_value(student.name.c_str());
    
        pugi::xml_node xage = xstudent.append_child("Age");
        char buf[128] = { 0 };
        sprintf(buf, "%d", student.age);
        xage.append_child(pugi::node_pcdata).set_value(buf);
      }
    
      xdoc.print(std::cout);
    
      xdoc.save_file(kFileName);
    }
    
    // 读取并解析XML。
    static void ReadData() {
      std::list<Student> students;
    
      pugi::xml_document xdoc;
      if (!xdoc.load_file(kFileName)) {
        return;
      }
    
      pugi::xml_node xstudents = xdoc.child("Students");
      for (pugi::xml_node xstudent = xstudents.first_child(); xstudent != NULL; xstudent = xstudent.next_sibling()) {
        int id = xstudent.attribute("id").as_int();
    
        pugi::xml_node xname = xstudent.child("Name");
        std::string name = xname.text().as_string();
    
        pugi::xml_node xage = xstudent.child("Age");
        int age = xage.text().as_int();
    
        students.push_back(Student(id, name, age));
      }
    
      for (const Student& student : students) {
        student.Print();
      }
    }
    
    int main() {
      WriteData();
      ReadData();
    
      return 0;
    }