版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/xianyunxiaohe/article/details/85909519
闲话少说，先看一段简单的代码
#include <iostream>
#include <string>
#include <vector>
#include <fstream>
#include <sstream>
#pragma warning(disable:4996)
using namespace std;
class teacher
{
public:
teacher()
{
}
teacher(string name, int age)
{
this->name = name;
this->age = age;
}
string GetName()
{
return name;
}
string SetName(string name)
{
this->name = name;
}
int GetAge()
{
return age;
}
~teacher()
{
}
void Print()
{
cout << this->name << " " << this->age;
}
private:
string name;
int age;
};
int main()
{
teacher t1("zhangsan",20);
teacher t2("李四",40);
ofstream fin("test1.txt", ios::binary);
fin.write((char *)&t1, sizeof(teacher));
fin.write((char *)&t2, sizeof(teacher));
fin.close();
teacher tmp;
ifstream fout("test1.txt", ios::binary);
fout.read((char *)&tmp, sizeof(teacher));
tmp.Print();
cout << endl;
fout.read((char *)&tmp, sizeof(teacher));
tmp.Print();
cout << "string:"<<sizeof(string) << endl;
fout.close();
return 0;
}当使用以上代码的方法时，虽然vs2013运行时不会报错，但是当你单步调试的时候，到最后析构teacher这个类的时候，会有程序中断。原因是因为string类型导致的，本人使用以下代码就不会有这个问题，代码如下：
#include <iostream>
#include <string>
#include <vector>
#include <fstream>
#include <sstream>
#pragma warning(disable:4996)
using namespace std;
class teacher
{
public:
teacher()
{
}
teacher(char* name, int age)
{
this->name = name;
//strcpy(this->name, name);
this->age = age;
}
string GetName()
{
return name;
}
string SetName(string name)
{
this->name = name;
}
int GetAge()
{
return age;
}
~teacher()
{
}
void Print()
{
cout << this->name << " " << this->age;
}
private:
//char name[50];
string name;
int age;
};
int main()
{
teacher t1("zhangsan",20);
teacher t2("李四",40);
ofstream fin("test1.txt", ios::binary);
// fin.write((char *)&t1, sizeof(teacher));
// fin.write((char *)&t2, sizeof(teacher));
fin << t1.GetName() << endl;
fin << t1.GetAge() << endl;
fin.close();
teacher tmp;
char name_tt[30];
string name_tmp;
ifstream fout("test1.txt", ios::binary);
/*
fout.read((char *)&tmp, sizeof(teacher));
tmp.Print();
cout << endl;
fout.read((char *)&tmp, sizeof(teacher));
tmp.Print();
cout << "string:"<<sizeof(string) << endl;
*/
fout.getline(name_tt, 30);
cout << name_tt << endl;
fout.close();
return 0;
}至于为什么会出现这种问题，本人也不晓得，网上有人说是string的存储不是连续，但是这和string的析构有什么关系？欢迎大家讨论。
在此谢谢大家。。。
参考文献：
https://blog.csdn.net/sq1652827791/article/details/48176597
https://stackoverflow.com/questions/10335714/c-iostream-binary-read-and-write-issues