how to read empty text file

Question

1.00/5 (2 votes)

See more:

I have a code like this to read from text file, but if my text file has no text then my code does not work and shows an error

MY CODE:

VB

Dim sSourceFile, sLine As String
        Dim a As String
        sSourceFile = "E:\hash\WindowsApplication1\WindowsApplication1\bin\a.txt"
        FileOpen(100, sSourceFile, OpenMode.Input, OpenAccess.Read)

        sLine = LineInput(100)
        a = Mid(sLine, 1)
        ListBox1.Items.Add(a)
        While Not EOF(100)
            sLine = LineInput(100)
            a = Mid(sLine, 1)
            ListBox1.Items.Add(a)
        End While
        FileClose(100)
        IP_Server = ListBox1.Items(0)
        server = ListBox1.Items(1)
        DB = ListBox1.Items(2)
        User_Server = ListBox1.Items(3)
        Pass = ListBox1.Items(4)

my error if text file is empty:

Input past end of file.
this error show for line " sLine = LineInput(100)"

tnx for yr help

Posted 22-Nov-11 20:39pm

atefeh_boush

Updated 22-Nov-11 21:12pm

Scubapro

v3

Add a Solution

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)

Sergey Alexandrovich Kryukov · Answer 1 · 2011-11-22T20:50:00

Why you don't ask what to do if a file is two times shorted than expected? What to do it it contains some garbage? Effectively, this is exactly the same as empty file.

You can ask yourself why do you allow to read zero bytes in the file in first place and fix it, but this is not the most important thing.

You should always expect that any file contains anything unexpected. You can expect that a file is inaccessible. In this way, you don't need to check any special condition like if the file is empty or something like that. You cannot predict all possible error conditions with file. Anyone could get to the file and mangle or truncate any number of bytes. What you see is the legitimate exception. Catch the exception, get exception information (type, message), for know exception types wrap it in some reasonable explanation text and present to the user.

—SA