C/C++中二进制文件&顺序读写详解及其作用介绍

#include <fstream>
#include <iostream>
using namespace std;

int main() {
    int x = 12345;
    ofstream outfile("binary.txt", ios::binary);

    outfile.write((char*)&x, 2);  // 写入
    outfile.close();  // 释放

    return 0;
}

#include <fstream>
#include <iostream>
using namespace std;

int main() {
    int x = 12345;
    ofstream outfile("ASCII.txt");
    
    outfile << x << endl;  // 写入
    outfile.close();  // 释放

    return 0;
}

ofstream a("file1.dat", ios::out | ios::binary);
ifstream b("file2.dat",ios::in | ios::binary);

istream& read(char *buffer,int len);
ostream& write(const char * buffer,int len);

a.write(p1,50)

b.read(p2,30)

#include <fstream>
#include <iostream>
#include "Student.h"
using namespace std;

int main() {
    Student stud[2] = {
            {01, "Little White"},
            {01, "Big White"}
    };

    ofstream outfile("student.dat", ios::binary);
    if(!outfile){
        cerr << "open error"  << endl;
        exit(1);  // 退出程序
    }
    for (int i = 0; i < 2; ++i) {
        outfile.write((char*)&stud[i], sizeof(stud[i]));
    }
    cout << "任务完成, 请查看文件" << endl;
    outfile.close();

    return 0;
}

#include <fstream>
#include <iostream>
#include "Student.h"
using namespace std;

int main() {
    Student stud[2];

    ifstream infile("student.dat", ios::binary);
    if(!infile){
        cerr << "open error"  << endl;
        exit(1);  // 退出程序
    }

    // 读取数据
    for (int i = 0; i < 2; ++i) {
        infile.read((char*)&stud[i], sizeof(stud[i]));
    }
    infile.close();

    // 显示数据
    for (int i = 0; i < 2; ++i) {
        stud[i].display();
    }

    return 0;
}