fileHandling guide...

hi,

I've problem in file handling when i instantiate object thorough fstream ... then file does not open or created... and then through exception my problem close..

   
      




#include"iostream"
#include"fstream"
#include"cstdlib"
#include"ClientData.h"
#include"iomanip"
#include <stdio.h>



using namespace std;

void outputline(ostream&,const ClientData&);


void main(){

	
	
	
int accountNumber;

char lastName[15];
char firstName[10];
double balance;

fstream outCredit;

outCredit.open("credit.txt",ios::out|ios::in|ios::binary);


[b]// problem is here.... file does not open...and then program will exit...[/b]

	if(!outCredit)
	{
		cerr<<"file could not be openened."<<endl;
		
		exit(1);

	}
	//outCredit.clear();



cout<<"Enter account number";
ClientData client;

cin>>accountNumber;

while(accountNumber>0 && accountNumber <=100 )
{


	cout<<"enter lastname, firstName and balance value";
	cin>>lastName;
	cin>>firstName;
	cin>>balance;

	client.setAccountNumber(accountNumber);
	client.setLastName(lastName);
	client.setFirstName(firstName);
	client.setBalance(balance);

	outCredit.seekp( (client.getAccountNumber()-1) * sizeof(ClientData) );

	outCredit.write(reinterpret_cast< const char * >(&client),sizeof(ClientData) );

	cout<<"enter accoutn number"<<endl;
	cin>>accountNumber;

}

outCredit.close();

//ClientData obj;

ifstream inCredit("credit.txt",ios::in);


if(!inCredit)
	{
		cerr<<"file could not be openened."<<endl;
		
		exit(1);

	}


inCredit.read(reinterpret_cast<char * >(&client),sizeof(ClientData) );

while(inCredit && !inCredit.eof())
{

	if(client.getAccountNumber()!=0)
		outputline(cout,client);


	inCredit.read(reinterpret_cast<char * >(&client),sizeof(ClientData) );
}


inCredit.close();

//remove("credit.txt");
}

void outputline(ostream &output,const ClientData &record)
{

	output<<left<<setw(10)<<record.getAccountNumber()
		<<setw(16)<<record.getLastName()
		<<setw(11)<<record.getFirstName()
		<<setw(10)<<setprecision(2)<<right<<fixed
		<<showpoint<<record.getBalance()<<endl;




		
}

Code (markup):

 

anybody reply me...

 

Apparently it doesn't work when having both in and out mode if you don't have app mode. So you can either add append mode or you can remove ios::in and it will work.