C++中文件操作基础详解

#include <fstream>

#include<iostream>
#include<fstream>
using namespace std;
//写文件操作
void test()
{
    ofstream file;
    file.open("myFirstFile.txt", ios::out);
    file << "姓名：叶落秋白" << endl;
    file << "年龄：繁华的18岁" << endl;
    file << "爱好：码字" << endl;
    file.close();
}
int main(void)
{
    test();
    return 0;
}

#include <fstream>

#include<iostream>
#include<fstream>
#include<string>
using namespace std;
//读文件
void readFile()
{
    ifstream file;
    file.open("myFirstFile.txt",ios::in);
    if (!file.is_open())
    {
        cout << "文件打开失败，请检查文件路径!"<<endl;
        return;
    }
    //1、
    char buffer[1024];
    while (file >> buffer)
    {
        cout << buffer << endl;
    }
    //2、
    char buffer[1024];
    while (file.getline(buffer,sizeof(buffer)))
    {
        cout << buffer << endl;
    }
    //3、
    string buffer;
    while (getline(file, buffer))
    {
        cout << buffer << endl;
    }
    //4、
    char c;
    while ((c = file.get()) != EOF) 
    {
        cout << c ;
    }
    file.close();
}
int main(void)
{
    readFile();
    return 0;
}

#include <fstream>
#include <string>
using namespace std;
class Student
{
public:
    char m_Name[32];
    int m_Age;
};
//二进制文件  写文件
void test01()
{
    ofstream ofs;
    ofs.open("student.txt", ios::out | ios::binary);
    Student p = { "叶落秋白"  , 18 };
    //类型强转
    ofs.write((const char*)&p, sizeof(p));
    ofs.close();
}
 
int main(void)
{
    test01();
    return 0;
}

#include <fstream>
#include<iostream>
#include <string>
using namespace std;
class Student
{
public:
    char m_Name[32];
    int m_Age;
};
void test02()
{
    //创建流对象和打开方式可以一步到位,(调用内部构造函数)
    ifstream ifs("student.txt", ios::in | ios::binary);
    if (!ifs.is_open())
    {
        cout << "文件打开失败" << endl;
    }
    Student p;
    //类型强转
    ifs.read((char*)&p, sizeof(p));
    ifs.close();
    cout << "学生姓名：" << p.m_Name << "\n学生年龄：" << p.m_Age << endl;
}
int main(void)
{
    test02();
    return 0;
}