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millisys

FileReadLine() syntax question

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millisys

Hi, I am using the FileReadLine() function to proceed through the dates of a calendar and then using the FileReadLine function to view tomorrow's schedule simultaneously.

The code shows tomorrow's schedule perfectly but then causes the FileReadLine() function to skip a line.

For example, in the code and test.txt file below it will skip from 11/01/2012 to 11/03/2012

Would someone be so kind as to show me how should the code be written differently so that it works as intended without skipping a line?

11/01/2012,mary
11/02/2012,sue
11/03/2012,jane
11/04/2012,bob

$file = FileOpen("test.txt", 0)
$linenumber = 0
While 1
$line = FileReadLine($file)
If @error = -1 Then ExitLoop
$linenumber += 1
MsgBox(0, "", $line & @CRLF & FileReadLine($file,$linenumber+1))
Wend
FileClose($file)
Edited by millisys

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Nessie

Try _FileReadToArray

#include <File.au3>

$file = "test.txt"

Local $aRecords
If Not _FileReadToArray($file, $aRecords) Then
    MsgBox(4096, "Error", " Error reading log to Array     error:" & @error)
    Exit
EndIf

For $x = 1 To $aRecords[0]
    MsgBox(0, 'Record:' & $x, $aRecords[$x])
Next

Hi!


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BrewManNH

To the OP, FileReadLine without a line number will read the next line of a file. If you use FileReadLine($sometextfile, 11) and then use FileReadLine($sometextfile) it's going to read line 12 because the last line it read was 11. Using FileReadLine with a line number will be very slow on large text files, so is usually avoided.


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millisys

Thank you Nessie,

In order to show both todays student name and tomorrows student name, would you write it like this?

#include <File.au3>
$file = "test.txt"
Local $aRecords
If Not _FileReadToArray($file, $aRecords) Then
    MsgBox(4096, "Error", " Error reading log to Array   error:" & @error)
    Exit
EndIf
For $x = 1 To $aRecords[0]
$array0 = StringSplit($aRecords[$x],",")
$array1 = StringSplit($aRecords[$x+1],",")
    MsgBox(0, 'Record:' & $x, "$today's student name = " & $array0[2] & @CRLF & "tomorrow's student name = " & $array1[2])
Next

If I want to show a day 20 days in the future, can I do it inline within the MsgBox function without having to create an $array21?

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millisys

Thank you Werty,

I would like to be able to view the current line and the next line simultaneously.

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millisys

Thank you for the explanation BrewManNH.

What is the appropriate circumstance to use the FileReadLine() function?

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BrewManNH

You'd use it to read a file in a loop, or to read a specific line in a file.

To read your file I'd use the script you posted last, and adapt it as needed. To read 20 days into it, you'd read $aRecords[19], that should be the line 20 days from the start of the file.


If I posted any code, assume that code was written using the latest release version unless stated otherwise. Also, if it doesn't work on XP I can't help with that because I don't have access to XP, and I'm not going to.
Give a programmer the correct code and he can do his work for a day. Teach a programmer to debug and he can do his work for a lifetime - by Chirag Gude
How to ask questions the smart way!

I hereby grant any person the right to use any code I post, that I am the original author of, on the autoitscript.com forums, unless I've specifically stated otherwise in the code or the thread post. If you do use my code all I ask, as a courtesy, is to make note of where you got it from.

Back up and restore Windows user files _Array.au3 - Modified array functions that include support for 2D arrays.  -  ColorChooser - An add-on for SciTE that pops up a color dialog so you can select and paste a color code into a script.  -  Customizable Splashscreen GUI w/Progress Bar - Create a custom "splash screen" GUI with a progress bar and custom label.  -  _FileGetProperty - Retrieve the properties of a file  -  SciTE Toolbar - A toolbar demo for use with the SciTE editor  -  GUIRegisterMsg demo - Demo script to show how to use the Windows messages to interact with controls and your GUI.  -   Latin Square password generator

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millisys

Thank you for your help BewManNH

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guinness

You might want to look at UBound in the help file, this will be able to check the number of dimensions in the array. Therefore if there are only 20 lines, checking the 21st won't invoke an 'out of bounds error'.


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millisys

Thank you Guinness. I received the 'out of bounds error'and was wondering how to resolve it. I will check out the UBound() function.

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