将CPP写入/读取类到二进制文件

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

class Person {
public:
    std::string name;
    int age;

    // 写入二进制文件
    void writeToFile(const std::string& filename) {
        std::ofstream outFile(filename, std::ios::binary);
        if (!outFile) {
            std::cerr << "Error opening file for writing: " << filename << std::endl;
            return;
        }
        outFile.write(reinterpret_cast<const char*>(&age), sizeof(age));
        outFile.write(name.c_str(), name.size() + 1);
        outFile.close();
    }

    // 从二进制文件读取
    void readFromFile(const std::string& filename) {
        std::ifstream inFile(filename, std::ios::binary);
        if (!inFile) {
            std::cerr << "Error opening file for reading: " << filename << std::endl;
            return;
        }
        inFile.read(reinterpret_cast<char*>(&age), sizeof(age));
        char buffer[256];
        inFile.getline(buffer, sizeof(buffer), '\0');
        name = buffer;
        inFile.close();
    }
};

int main() {
    Person p1;
    p1.name = "Alice";
    p1.age = 30;

    // 写入文件
    p1.writeToFile("person.bin");

    Person p2;
    // 从文件读取
    p2.readFromFile("person.bin");

    std::cout << "Name: " << p2.name << ", Age: " << p2.age << std::endl;

    return 0;
}