io流的二进制读写

#define _CRT_SECURE_NO_WARNINGS
#include<iostream>
#include<stdexcept>
#include<algorithm>
#include<fstream>
#include<string>

class make {
public:
    make(const char* name, int age) {
        this->age = age;
        std::strcpy(this->name, name);
    }
    make() {}

    char name[64];
    int age;
};

//写文件
void test01() {
    make m1("123", 123);
    make m2("456", 456);

    std::ofstream ofs;
    ofs.open("test.txt",std::ios::out | std::ios::trunc | std::ios::binary);
    if (!ofs.is_open()) {
        std::cout << "open fail\n";
    }

    //写
    ofs.write((const char*)&m1, sizeof(make));
    ofs.write((const char*)&m2, sizeof(make));

    ofs.close();
}

//read file

void test02() {
    std::ifstream ifs;
    ifs.open("test.txt", std::ios::in | std::ios::binary);
    if (!ifs.is_open()) {
        std::cout << "打开失败\n";
    }

    //read file
    make m1, m2;

    ifs.read((char*)&m1, sizeof(make));
    ifs.read((char*)&m2, sizeof(make));

    std::cout << "name:" << m1.name << " age:" << m1.age << '\n';
    std::cout << "name:" << m2.name << " age:" << m2.age << '\n';

    ifs.close();
}

auto main()->int32_t{
   

    test01();
    test02();
    return static_cast<int>(0);
}