在C++中读取不同格式的数据

#include<iostream>
#include <fstream>
#include<string>

int main() {
    std::ifstream infile("example.txt");
    std::string line;

    if (infile.is_open()) {
        while (std::getline(infile, line)) {
            std::cout<< line<< std::endl;
        }
        infile.close();
    }

    return 0;
}

#include<iostream>
#include <fstream>
#include<string>

int main() {
    std::ifstream infile("example.bin", std::ios::binary);
    char buffer[100];

    if (infile.is_open()) {
        infile.read(buffer, sizeof(buffer));
        infile.close();
    }

    return 0;
}

#include<iostream>
#include <fstream>
#include <nlohmann/json.hpp>

using json = nlohmann::json;

int main() {
    std::ifstream infile("example.json");
    json j;

    if (infile.is_open()) {
        infile >> j;
        infile.close();
    }

    std::cout << j["key"]<< std::endl;

    return 0;
}

#include<iostream>
#include <fstream>
#include <pugixml.hpp>

int main() {
    std::ifstream infile("example.xml");
    pugi::xml_document doc;

    if (infile.is_open()) {
        doc.load(infile);
        infile.close();
    }

    pugi::xml_node root = doc.child("root");
    std::cout<< root.child_value("key")<< std::endl;

    return 0;
}