CODEWITHSUNDEEP
c#
Nogg
Nogg

Reputation: 337

How to read a line from a file?

    using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;

namespace as2
{
    class Program
    {
        static void Main(string[] args)
        {
            int id = 0, stock = 0, published = 0, newstock = 0;
            double price = 0.00;
            string type = " ", title = " ", author = " ";

            Program inventroy = new Program();
            inventroy.read_one_record(ref id, ref stock, ref published, ref price, ref type, ref title, ref author);

            Console.WriteLine("Update Number In Stock");
            Console.WriteLine("=======================");
            Console.Write("Item ID: ");
            Console.WriteLine(id);
            Console.WriteLine("Item Type: ");
            Console.Write(type);
        }

        void read_one_record(ref int id, ref int stock, ref int published, ref double price, ref string type, ref string title, ref string author)
        {
            StreamReader myFile = File.OpenText("Inventory.dat");

            id = int.Parse(myFile.ReadLine());
            stock = int.Parse(myFile.ReadLine());
            published= int.Parse(myFile.ReadLine());
            stock = int.Parse(myFile.ReadLine());
            price = double.Parse(myFile.ReadLine());
            type = myFile.ReadLine();
            title = myFile.ReadLine();
            author = myFile.ReadLine();

            myFile.Close();

        }
        void write_one_record(int id, int newstock, int published, double price, string type, string title, string author)
        {
            StreamWriter myFile = new StreamWriter(File.OpenWrite("Inventory.dat"));


            myFile.WriteLine(id);
            myFile.WriteLine(newstock);
            myFile.WriteLine(published);
            myFile.WriteLine(price);
            myFile.WriteLine(type);
            myFile.WriteLine(title);
            myFile.WriteLine(author);

            myFile.Close();
        }
    }
}

Im trying to read in a full line but ReadLine is string and the first thing im pulling from the file is: 123456

123456

15

2011

69.99

book

Problem_Solving_With_C++

Walter_Savitch (the actual text file doesn't have empty lines inbetween)

then 15 then 2011, which should I use? Read? Will I have to use some kind of loop to figure out when the end of the line is?

Upvotes: 0

Views: 296

Answers (3)

Richard Schneider
Richard Schneider

Reputation: 35477

For the int values, you must still use ReadLine(), but then parse as an int.

    void read_one_record(ref int id, ref int stock, ref int published, ref double price, ref string type, ref string title, ref string author)
    {
        StreamReader myFile = File.OpenText("Inventory.dat");

        id = int.Parse(myFile.ReadLine());
        stock = int.Parse(myFile.ReadLine());
        published= int.Parse(myFile.ReadLine());
        stock = int.Parse(myFile.ReadLine());
        price = double.Parse(myFile.ReadLine());
        type = myFile.ReadLine();
        title = myFile.ReadLine();
        author = myFile.ReadLine();

        myFile.Close();

    }

Upvotes: 0

ThePerson
ThePerson

Reputation: 3236

If you open up the file in notepad, you may find that there are line spaces that you don't see in other text editors.

ReadinLine() should read until it finds the character '\n'

Sorry if you already knew this, but it drove me mad for a while until I eventually found that there were line spaces I couldn't see. Try notepad, and try wordpad,.. do you see any differences?

Upvotes: 0

SLaks
SLaks

Reputation: 888107

You need to parse the string into a number, using a function like int.Parse.

Upvotes: 1

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