Problem In Entering adn Reading The Dat From File

Question

0.00/5 (No votes)

See more:

Hello Everyone!

i am trying to make File handling program in C++,but i got the Error on Displaying the Records From the File.My Program take input from me Correctly but when the time is to View Program did not show me anything and Stop all Execution of the Program.

Please see the Below Program and tell me what is the Error in Displaying Part of The Program or Anywhere in the Program.

C++

#include <iostream>
#include <fstream>
using namespace std;

struct Student
{
private:
    string Name;
    int Age;
public:
    Student()
    {
        Name="";
        Age=0;
    }
    void GetData()
    {
        cout<<"Enter Name:";
        cin>>Name;
        cout<<"\nEnter Age:";
        cin>>Age;
    }
    void ShowData()
    {
        cout<<"Name:"<<Name;
        cout<<"\nAge:"<<Age;
    }
};
void Write_File()
{
    Student Obj;
    ofstream Input_Data;
    Input_Data.open("Student_Data.dat",ios::app|ios::binary);
    Obj.GetData();
    Input_Data.write(reinterpret_cast<char*> (&Obj),sizeof(Student));
    Input_Data.close();
}
void Display_Data()
{
    Student Obj;
    ifstream Output_Data;
    Output_Data.open("Student_Data.dat",ios::binary);
    while(Output_Data.read(reinterpret_cast<char*> (&Obj),sizeof(Student)))
    {
        Obj.ShowData();
    }
    Output_Data.close();
}
int main()
{
    Student Obj;
    char Choice;
    cout<<"Write Data Into The File."<<endl<<endl;
    do
    {
        Write_File();
        cout<<"\n\t\t\tDo You Want To Enter More Data Y/N :";
        cin>>Choice;
   }while(Choice=='y' || Choice=='Y');
    cout<<"\n\nOutput Of The Record:"<<endl;
    Display_Data();
    return 0;
}

Posted 27-Nov-14 4:55am

Member 11004573

Updated 27-Nov-14 6:07am

Tomas Takac

v2

Add a Solution

Comments

Richard MacCutchan 27-Nov-14 13:09pm

I suspect it is to do with reading the data directly into the object, rather than reading each property individually and recreating the object with a setter, or parameterised constructor.

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

bling · Answer 1 · 2014-11-28T05:45:00

You have a scope problem.

You declare "Student Obj" in main() but never use it.

Replace ...

C#

void Write_File()
{
    Student Obj;

... with ...

C#

void Write_File(Student &Obj)
{

Do the same for Display_Data. Change you main function to something like this:

C++

int main()
{
    Student Obj;
    char Choice;

    cout << "Write Data Into The File." << endl << endl;
    do
    {
        Write_File(Obj);
        cout << "\n\t\t\tDo You Want To Enter More Data Y/N :";
        cin >> Choice;
    }
    while(Choice=='y' || Choice=='Y');
    cout << "\n\nOutput Of The Record:" << endl;
    Display_Data(Obj);
    return 0;
}