File handling in C++ gives .exe stopped working error -

i have basic file handling code of reading file named"student.dat" using visual studio.

the output reads file , displays result in console visual studio pops dialog as

code:

#include<iostream> #include<fstream> #include<conio.h> #include<string>  using namespace std; class student {             int admno;            // char name[20];             string name; public:           void getdata()           {                      cout<<"\n\nenter name of student ";                      //gets(name);                      cin>>name;                      getch();                      cout<<"\nenter admission no. ";                      cin>>admno;                        // getch();           }           void showdata()           {                      cout<<"\nadmission no. : "<<admno;                      cout<<"\nstudent name : ";                      cout<<name;                      //puts(name);            }           int retadmno()           {                      return admno;           }   };   int main() {       student obj;           ifstream fp1;           fp1.open("student.dat",ios::binary);           while(fp1.read((char*)&obj,sizeof(obj)))           {                      obj.showdata();           }            fp1.close();   return 0; } 

you try store/load object file, invalid.

while(fp1.read((char*)&obj,sizeof(obj))) 

objects may contain references memory (std::string e.g.) invalid after loading. have provide serialization objects or use plain structs without pointers or references store data. e.g.:

struct {     int      admno;     char[20] name; } 

if need strings variable length, may use string store:

struct {     int     admno;     size_t  name_index; }  std::vector<std::string> names; 

to store, iterate on names , save length , .c_str of each std::string. read, other way around , read length n, read n bytes buffer , construct std::string out of buffer.

you might have @ http://www.boost.org/doc/libs/1_55_0/libs/serialization/doc/index.html