Reading only the last line

[jimmyjoe]

How do I use filereadline to read the last line of a text log whenever the size or number of lines of the file is constantly changing. Im trying to read the last line of a chat log after some other actions looking for a certain line of text and when it sees that line of text it will call another function. I just need it to repeat looking at the last line of file as lines are wrote to it until it sees the phase im looking for. Im sure its simple but all im seeing is for the action to read from line 1 to end which i dont believe would be good when the file gets up to 2 mbs or larger. Any help would be appreciated.

Edited November 30, 2007 by jimmyjoe

[Paulie]

Here's a UDF:

#include <File.au3>
Msgbox(0,"", _FileReadLastLine("Path to file"))

Func _FileReadLastLine($Filepath)
    $File = FileOpen($Filepath, 0)
    $Line = _FileCountLines($FilePath)
    $Result = FileReadLine($File, $Line)
    FileClose($File)
Return $Result
EndFunc

Edited November 30, 2007 by Paulie

[GEOSoft]

Just going off the top of my head here but I think there is a _FileGetLineCount() function in the UDFs. You might be able to put that function in a loop and when the line count changes use FileReadLine() to read the last line.

Someone else will probably come up with a simpler method.

[Uten]

Make sure to read the code in _FileGetLineCount(). If I recall right it ain't efficient. Especially if you read it over and over again. My files here are old, so you better check for your selfe..

Wonder if there is a topic named tail in here somewhere?

[martin]

Here's a UDF:

#include <File.au3>
Msgbox(0,"", _FileReadLastLine("Path to file"))

Func _FileReadLastLine($Filepath)
    $File = FileOpen($Filepath, 0)
    $Line = _FileCountLines($FilePath)
    $Result = FileReadLine($File, $Line)
    Return $Result
EndFunc

Since the function will be called often you will soon run into problems; you need to add FileClose($File) before the function returns.

[Uten]

Better try tailrw in this topic.

[tittoproject]

Here a simple function that reads a file into an array:

Func _FileToArray($file)
    Local $handle = FileOpen($file, 0)
    If $handle = -1 Then Return SetError(1)
    Local $read[1], $i = 0
    $read[0] = 0
    While 1
        Local $line = FileReadLine($handle)
        If @error = -1 Then ExitLoop
        $i += 1
        $read[0] = $i
        ReDim $read[$i + 1]
        $read[$i] = $line
    WEnd
    FileClose($file)
    Return $read
EndFunc   ;==>_FileToArray

$read[0] contains the numbers of lines, therefore the content of the last line is $read[$read[0]]

[Paulie]

Since the function will be called often you will soon run into problems; you need to add FileClose($File) before the function returns.

Thats true. I Forgot that. Done.

[GEOSoft]

Thanks Paulie.

_FileCountLines() is the one I was thinking of.

Keep it up and you will soon be getting mentioned as my nemesis again.

[Paulie]

Thanks Paulie.

_FileCountLines() is the one I was thinking of.

Keep it up and you will soon be getting mentioned as my nemesis again.

Haha! Oh noes!

[jimmyjoe]

Thx for the help guys. I got it done.