UC知道C++ 磁盘存储对象
来源：百度知道 编辑：UC知道 时间：2024/06/18 22:17:11
我设计了一个类Student,并创建对象student,我想把它存入磁盘文件,但是存进去再读出来是乱码（一个巨大的负整数） 请问怎么解决。或者是应该用别的方法存储对象？
#include<iostream>
#include<string>
#include<list>
#include<fstream>
using namespace std;
class Student;
ostream& operator<<(ostream& out,Student& obj);
class Student
{
public:
string name;
int age;
int score;
Student(){}
Student(string n,int a,int s)
{
name=n;
age=a;
score=s;
}
friend ostream& operator<<(ostream& out,Student& obj);
};
ostream& operator<<(ostream& out,Student& obj) {
out<<obj.name<<" "<<obj.age<<" "<<obj.score<<endl;
return out;
}
void main()
{
list<Student> s;
list<Student>::iterator i;
ofstream output;
string name;
int age,s
#include<iostream>
#include<string>
#include<list>
#include<fstream>
using namespace std;
class Student;
ostream& operator<<(ostream& out,Student& obj);
class Student
{
public:
string name;
int age;
int score;
Student(){}
Student(string n,int a,int s)
{
name=n;
age=a;
score=s;
}
friend ostream& operator<<(ostream& out,Student& obj);
};
ostream& operator<<(ostream& out,Student& obj) {
out<<obj.name<<" "<<obj.age<<" "<<obj.score<<endl;
return out;
}
void main()
{
list<Student> s;
list<Student>::iterator i;
ofstream output;
string name;
int age,s
output.write((char*)&student,sizeof(student));//将Student类对象student存入文件
改成
output<<student.name<<" "<<student.age<<" "<<student.score<<endl;
说句题外话，由于通常设计的时候name age score是私有的，可以在类里面设计一个函数，
string GetInfo（）把信息以字符串的形式传出来
那么这句就改成
output<<student.GetInfo<<endl;好看，也好维护。个人建议，仅供参考。
写个命名空间，编译成dll保存