Possible to FileReadLine backwards?

[Systems By]

Hi everyone. I have a question about the FileReadLine function. Do you know if it is possible to read a text file from the bottom up instead of from the top down? I am writing a backup program and want to be able to make the program delete the oldest backup files. I have all of the names of my backup files created in a cmd window and sent to a text file. A few people told me that it was possible in older versions of AutoIt, but have no idea if it's possible with v3.

[Xenobiologist]

HI,

is that really neccessary? You could use _FileReadToArray() and then take Ubound -1 , -2 and so on.

This way of course, you read the whole file. (Performance if hufe file :-( )

So long,

Mega

Edited June 19, 2006 by th.meger

[jvanegmond]

#include <File.au3>

FileReadLine ( filehandle or "filename" , _FileCountLines(filehandle or "filename") - $number_of_lines_counting_from_bottom )

[Xenobiologist]

#include <File.au3>

FileReadLine ( filehandle or "filename" , _FileCountLines(filehandle or "filename") - $number_of_lines_counting_from_bottom )

Hi,

_FileCountLines(filehandle or "filename") works only with path not with filehandle!

I have to test what is faster. Array, or FCL

So long,

Mega

[SmOke_N]

This is like _FileReadToArray(), but without the need to #include <file.au3>

$FilePath = 'Path to file here'
$FileRead = FileRead($FilePath, FileGetSize($FilePath))
$CreateArray = StringSplit($FileRead, @CR)
For $iCount = UBound($CreateArray) - 1 To 1 Step - 1;Start reading backwards
    ConsoleWrite($CreateArray[$iCount] & @LF)
Next

[trids]

I would look for something called a "tail utility". You'll find several commandline equivalents of the original Unix utility via Google.

Then you can just call it from your au3 script to produce the summarised logfile.

HTH

[randallc]

Hi,

_FileCountLines(filehandle or "filename") works only with path not with filehandle!

I have to test what is faster. Array, or FCL

So long,

Mega

Hi, you would only have to call it once;

$FileCountLines=FileCountLines( "filename")

$number_of_lines_counting_from_bottom=0

while 1

FileReadLine ( filehandle or "filename" , $FileCountLines- $number_of_lines_counting_from_bottom )

if @error then exitloop

$number_of_lines_counting_from_bottom+=1

wend

etc - would it work?; how quick?

I'd be interested in you timing results; not with Arrays for large files. though!?

[Even "tail.exe" in microsoft would neeed number of lines first, I think.]

Randall