Solved

Get C# File "Stream Reader" Last Line

Posted on 2012-03-30
2,151 Views
Hi ,
I need To Get The Last Line Only From A massive 10GB Text File
Any Help Will Be Accepted And Thanks In Advance For The Effort
0
Question by:AhmedHindy
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

• Help others & share knowledge
• Earn cash & points

LVL 9

Expert Comment

ID: 37789487
String whatever= new String;
while !(EOF)
{
}
0

LVL 75

Expert Comment

ID: 37789492
Like this?

string lastLine = string.Empty;

{
{
}
}

// lastLine is now populate with last line of file or an empty string if no lines were read.

0

LVL 27

Accepted Solution

Chinmay Patel earned 300 total points
ID: 37789590
Hi AhmedHindy,

I would not recommend reading the file forward till the end and then read the last line.

I see there are two alternatives here
1. Use Tail for Windows - and using Process.Start you launch the application and get the results.
2. First seek to the end of the file and then read backwards till you hit a new line.

This file has fixed length lines?

Regards,
Chinmay.
0

LVL 4

Author Comment

ID: 37789592
Hi , Thanks For The Fast Answers But ,
My Main Problem is The File Length about 10 GB I need Some Fast Algorithm To Get Last Line Only Directly Or Almost Directly To Save Time
0

LVL 27

Expert Comment

ID: 37789599
Kindly note the URL for tail for the windows : http://sourceforge.net/projects/tailforwin32/

I posted the URL but it wouldn't work and I was editing my answer when you commented your last post :)

Kindly let me know if this file has fixed lenght lines or not?
0

LVL 86

Expert Comment

ID: 37789627
Right...if the file does NOT have fixed width lines (as Chinmay_Patel has asked) then you have to read byte by byte backwards from the end of the file until you find your carriage return/line feed combination.

See: http://stackoverflow.com/questions/398378/get-last-10-lines-of-very-large-text-file-10gb-c-sharp
0

LVL 4

Author Comment

ID: 37790634
First Thanks For All Responses ,
Second  Unfortunately File Has No Fixed Length
And I Will Try To Read The File Backward
Thanks Again For The Effort
0

Featured Post

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Styling your websites can become very complex. Here I'll show how SASS can help you better organize, maintain and reuse your CSS code.
Have you tried to learn about Unicode, UTF-8, and multibyte text encoding and all the articles are just too "academic" or too technical? This article aims to make the whole topic easy for just about anyone to understand.
Explain concepts important to validation of email addresses with regular expressions. Applies to most languages/tools that uses regular expressions. Consider email address RFCs: Look at HTML5 form input element (with type=email) regex pattern: T…
The viewer will learn how to create a basic form using some HTML5 and PHP for later processing. Set up your basic HTML file. Open your form tag and set the method and action attributes.: (CODE) Set up your first few inputs one for the name and …
Suggested Courses
Course of the Month7 days, 21 hours left to enroll