Thread: Reset to Beginning of file

Im doing some simple fileinput.. I am having issues resetting the file read to the start of the file. Basically If I run the function twice it won't work, once is fine though! :/ . I tried .seekg() but that didn't seem to work either. I am probably doing something arseways.. Anybody got any clues.

Code:

#include <iostream>
#include <string>

// The next line is required for input and output file IO
#include <fstream>

using namespace std;

void main()
{
	

	string line,songCount,songChoice,title;
	bool printOut = false;
	int exitLoop = 0;
	int menuChoice = 0;
	
	ifstream fileInput;
	fileInput.open("hnr0.abc", ios::in);

	cout << "Trad Music Selector:" << endl << endl;

	do
	{
		cout << "Menu Options: \n 1. Print List of songs \n \n enter choice: " ;
		cin >> menuChoice ;
		switch(menuChoice){

			fileInput.close();
			fileInput.open("hnr0.abc", ios::in);

			case 1:
				


					while(!fileInput.eof())
					{
						
						getline(fileInput,line);//read a line from data.txt and put it in a string

						
						/*if the first two characters X: print a blankline to seperate titles.
						After X: is found print all titles on the same line seperated by :*/
						
						if(line.find("X:")==0)
						{
							cout << endl << endl;
						}
						else if(line.find("T:")==0)
						{
							title = line.substr(2,string::npos);
							cout << title <<":" ;
						}

					}
				
				cout << endl << endl;


				break;

			
		}



		}while(exitLoop!=1);


	
}

Seekg should work:

Code:

fileInput.seekg(0, ios_base::beg);

void main() is incorrect in C++. It's always int main().

I may be mistaken, but using seekg to reset the read pointer to the start of file won't help you start from the beginning of the file because the end of file error bit is automatically set when you reach the end of the file. If you want to read the file again, you will need to use seekg to change the position of the pointer and then use the clear() method to reset the eof bit. You have to do it in that order because if you used the clear method first then the eof bit is automatically changed and so you don't get anywhere.

Here is some info about the clear() method. If you have any more problems just post again.

closing and reopening the file worked

using
clear()
before, not after
seekg(ios::beg) also worked