chaamurah

 Profile Answers by chaamurah 

• Feb 3rd, 2009

 

#include

#include ? ? ? ? ? //for i/o operations with respect to files

class Employee

{

int id;

?? ? ? ?char name[20];

public:

void set_details()

{

cout<<"enter name"<

cin>>name; //dont give blanks in between the name

cout<<"enter id"<

cin>>id;

}

void display_details()

{

cout<<"name : "<

cout<<"id :"<

}

};

int main()

{

//open the file file_name for writing objects.fstream object used for both input and output operations with respect to files

fstream fobj("file_name.txt",ios::out|ios::app);

Employee eobj;

char ch;

//to write in to file

//this do while loop will take the details of employee to an object and writes in to the file until u press 'n' or than 'y'

do

{

cout<<"enter the employee details"<

eobj.set_details();

//using write method we can write in to the file?

fobj.write ( (char *)(&eobj) , sizeof(eobj) );

cout<<"do u want to ?enter one more record (Y OR N)"<

cin>>ch;

}while(ch=='y' || ch =='Y')

fobj.close();

//to read from the file

fobj.open("file_name.txt",ios::read);

//read all the objects using read method and displaying.when read encounters end of file returns null.

while( ?fobj.read ( ?(char *)&eobj , sizeof(eobj) ) ?)

fobj.display_details();

fobj.close();

}

sim_sam

 Profile Answers by sim_sam 

• Feb 12th, 2009

 

A function in the class definition can be included which writes to the standard file stream and takes the name of target file as a parameter. Function prototype will be like this:

WriteObjectToFile (const char* fileName)
{
ofstream fout(fileName);
fout<< myVar1<<myVar2<<endl;
fout.close();
}

ajrobb

 Profile Answers by ajrobb 

• Sep 22nd, 2010

 

#include <ostream>

class Fred {
...
public:
  std::ostream & write(std::ostream & out) const;
};

inline std::ostream & operator<<(std::ostream out, Fred const & fred) {
  return fred.write(out);
}

int main() {
  Fred fred;
...
  std::cout << fred << 'n';
}

hi

• Nov 9th, 2016

 

I think the final fobj.display_detail(); in your code needs to change to eobj.display_detail();

Arman

• Jan 25th, 2018

 

You can write the object into file after serializing it. It is important to note that there are two types of objects: "persistence" and "non persistence". persistence objects are those which can be serialized and saved in file system.