#include<iostream>
#include<string>
//1：引入头文件
#include<fstream>
using namespace std;
//把程序中的信息输出到缓冲区，然后写到文件
void test01()
{//2:定义流对象ofstream ofs;//3:打开文件，以写的方式打开，如果没有文件，就创建ofs.open("test.txt", ios::out | ios::trunc);//4:判断是否打开成功if (!ofs.is_open()){cout << "打开失败" << endl;}//5:写信息ofs << "姓名：灰灰" << endl;;ofs << "年龄：20" << endl;//6:关闭文件ofs.close();//关闭文件，并刷新缓冲区
}
//把磁盘信息输入到缓冲区，然后读到程序中（读文件）
void test02()
{ifstream ifs;ifs.open("test.txt", ios::in);if (!ifs.is_open()){cout << "打开失败" << endl;}//第一种方式读取文件//一行一行读/*char buf[1024] = { 0 };while (ifs >> buf){cout << buf << endl;}*///第二种方式读取文件//char buf[1024] = { 0 };//while (!ifs.eof())//判断是否读到文件尾部//{//	ifs.getline(buf, sizeof(buf));//	cout << buf << endl;//}//第三种方式，一个一个字符读char c;while ((c = ifs.get()) != EOF){cout << c;}ifs.close();
}int main()
{test02();system("pause");return EXIT_SUCCESS;
}

c++的二进制读写

using namespace std;
class maker
{
public:maker(){}maker( const char*name,int age){strcpy(this->name, name);this->age = age;}public:int age;char name[64];
};
void test()
{maker m1("huihi", 20);maker m2("huifa",2);ofstream ofs;ofs.open("text.txt", ios::out |ios::trunc| ios::binary);if (!ofs.is_open()){cout << "打开失败" << endl;}//写ofs.write((const char*)&m1, sizeof(maker));ofs.write((const char*)&m2, sizeof(maker));ofs.close();
}
//读
void test02()
{ifstream ifs;ifs.open("text.txt", ios::in | ios::binary);if (!ifs.is_open()){cout << "打开失败" << endl;}//读maker m1;maker m2;ifs.read((char*) & m1, sizeof(maker));ifs.read((char*)&m2, sizeof(maker));cout << "name:" << m1.name << "age:" << m1.age << endl;cout << "name:" << m2.name << "age:" << m2.age << endl;
}
int main()
{test02();system("pause");return EXIT_SUCCESS;
}