C++文件操作

二进制

#include 
#include 
#include
#include 
using namespace std;
void wenjian_xie() {
	ofstream wenjian;//写操作
	//打开文件(为了写out)
	wenjian.open("wenjian.txt", ios::out);
	//写内容
	//注意内容是wenjian<<"内容"<
	ifstream wenjian;//读操作
	//打开文件，读in
	wenjian.open("wenjian.txt", ios::in);
	if (wenjian.is_open())
		cout << "打开成功" << endl;
	else {
		cout << "打开失败" << endl;
		return;
	}
	//读数据
	string buf;
	while (getline(wenjian, buf))
		cout << buf << endl;
	wenjian.close();
}
class stu {
public:
	char name[10];
	int age;
};
void wenjian_erjinzhixie() {
	ofstream wenjian("stu.txt", ios::out | ios::binary);
	//二进制写
	//wenjian.open("stu.txt", ios::out |ios::binary);
	stu s = { "张三",18 };
	wenjian.write((const char *)&s, sizeof(stu));
	wenjian.close();
}
void wenjian_erjinzhidu() {
	ifstream wenjian("stu.txt", ios::in | ios::binary);
	if (!wenjian.is_open())
	{
		cout << "shibai" << endl;
		return;
	}
	cout << "sucess" << endl;
	stu s;
	wenjian.read((char*)&s, sizeof(stu));
	cout << s.name << endl << s.age << endl;
	wenjian.close();
}
int main() {
	//文本文件
	//wenjian_xie();
	//wenjian_du();
	//二进制文件
	wenjian_erjinzhixie();
	wenjian_erjinzhidu();
	return 0;
}

#include 
#include 
#include
#include 
using namespace std;
void wenjian_xie() {
	ofstream wenjian;//写操作
	//打开文件(为了写out)
	wenjian.open("wenjian.txt", ios::out);
	//写内容
	wenjian << "张三n男n18岁" << endl;
	//关
	wenjian.close();
}
void wenjian_du() {
	ifstream wenjian;//读操作
	//打开文件，读in
	wenjian.open("wenjian.txt", ios::in);
	if (wenjian.is_open())
		cout << "打开成功" << endl;
	else {
		cout << "打开失败" << endl;
		return;
	}
	//读数据
	string buf;
	while (getline(wenjian, buf))
		cout << buf << endl;
	wenjian.close();
}
int main() {
	wenjian_xie();
	wenjian_du();
	return 0;
}

文本文件读取数据格式

string buf;
	while (getline(wenjian, buf))
		cout << buf << endl;