【C++】二进制文件向硬盘的输出和读入

最新推荐文章于 2023-10-10 15:50:17 发布

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本文通过C++实现了一个简单的文件读写程序，利用结构体存储学生信息，并使用ofstream和ifstream进行二进制文件的写入与读取操作。

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输出“stud.dat” ：

#include <fstream>
#include "stdlib.h"
#include "stdio.h"
#include "string.h"
#include "io.h" 
#include<iostream>




using namespace std;
struct student
{
	char name[20];
	int num;
	int age;
	char sex;
};
int main()
{
	student stud[3] = { "Li", 1001, 18, 'f', "Fun", 1002, 19, 'm', "Wang", 1004, 17, 'f' };
	ofstream outfile("stud.dat", ios::binary);
	if (!outfile)
	{
		cerr << "open error!" << endl;
		abort();//退出程序
	}
	for (int i = 0; i<3; i++)
		outfile.write((char*)&stud[i], sizeof(stud[i]));
	outfile.close();
	cout << sizeof(stud[0].name) << endl;
	return 0;
}

读入“stud.dat” ：

#include <fstream>
#include "stdlib.h"
#include "stdio.h"
#include "io.h" 
#include<iostream>
#include <string>
using namespace std;
struct student
{
	char name[20];
	int num;
	int age;
	char sex;
};
int main()
{
	student stud[3];
	int i;
	ifstream infile("stud.dat", ios::binary);
	if (!infile)
	{
		cerr << "open error!" << endl;
		abort();
	}
	for (i = 0; i<3; i++)
		infile.read((char*)&stud[i], sizeof(stud[i]));
	
	for (i = 0; i<3; i++)
	{
		cout << "NO." << i + 1 << endl;
		cout << "name:" << stud[i].name << endl;
		cout << "num:" << stud[i].num << endl;
		cout << "age:" << stud[i].age << endl;
		cout << "sex:" << stud[i].sex << endl;
	}
	infile.close();
	return 0;
}