C++ - Write Object into a File

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Write Object into a File

How will you write object into file using file concepts in C++?

Total Answers and Comments: 2

Last Update: February 12, 2009 Asked by: karthik_knight2000

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Best Rated Answer

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Submitted by: chaamurah

#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'

{

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();

}

Above answer was rated as good by the following members:
narasimulu

February 03, 2009 00:08:34

chaamurah

Member Since: February 2009 Contribution: 6

RE: Write Object into a File

#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'

{

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();

}

Is this answer useful? Yes | No

1 0

Overall Rating: +1

February 12, 2009 20:13:28

sim_sam

Member Since: February 2009 Contribution: 3

RE: Write Object into a File

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();
}

Is this answer useful? Yes | No

0 1

Overall Rating: -1

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