C++标准读写文件

#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <fstream>

using namespace std;

//文本文件读写
void test01()
{
const char* fileName = "C:\\Users\\Administrator\\Desktop\\source.txt";
const char* targetName = "C:\\Users\\Administrator\\Desktop\\target.txt";
ifstream ism(fileName, ios::in); //只读方式打开文件
ofstream osm(targetName, ios::out | ios::app);
//ifstream ism;
//ism.open(fileName, ios::in);

if (!ism)
{
cout << "打开文件失败！" << endl;
return;
}

char ch;
while (ism.get(ch))
{
cout << ch;
osm.put(ch);
}
ism.close();
osm.close();

}

//二进制文件操作 对象序列化
class Person
{
public:
Person()
{

}
Person(int age, int id) :age(age), id(id) {}
void show()
{
cout << "Age = " << age << ", ID = " << id << endl;
}
int age;
int id;
};

void test02()
{
/*
Person p1(10, 20), p2(30, 40); //二进制
//把p1 p2 写进文件里

const char* targetName = "C:\\Users\\Administrator\\Desktop\\target.txt";
ofstream  osm(targetName, ios::out | ios::binary);
osm.write((char*)&p1, sizeof(Person)); //二进制方式写文件
osm.write((char*)&p2, sizeof(Person));

osm.close();
*/

const char* targetName = "C:\\Users\\Administrator\\Desktop\\target.txt";
ifstream ism(targetName, ios::in | ios::binary);
Person p1, p2;
ism.read((char*)&p1, sizeof(Person)); //从文件读取数据
ism.read((char*)&p2, sizeof(Person));

p1.show();
p2.show();

}

int main()
{
test02();

return 0;
}