Solved

# Get C# File "Stream Reader" Last Line

Posted on 2012-03-30
1,702 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

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 85

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

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