Assigning a local array with 0 elements

[SlowCoder74]

Local $aArray[1] = [0] ; Shouldn't it be this then?

Can you explain what this is supposed to do?

[JohnOne]

It is a standard 0 based array, the value stored at the first element [0] is 0.

it can be manipulated to hold some other value ... $aArray[0] = 55764 ;etc...

I agree, your needs are very confusing.

EDIT:

In the alpha version, you can create an array like so...

Local $aArray[]

Edited April 25, 2012 by JohnOne

[Mechaflash]

from post #20 it just looks like you're asking "why can't [0] element be used" when it can?

#include 
Local $aArray[1]  ; Declare array with 1 element
$aArray[0] = "zero element" ; "zero element" exists at element [0]
_ArrayDisplay($aArray) ; Shows array output

So if you wanted [0] and [1] you would declare it as

Local $aArray[2]

instead. It's just counting the elements starting from 0, so the offset will always be -1. Edited April 25, 2012 by mechaflash213

[SlowCoder74]

It is a standard 0 based array, the value stored at the first element [0] is 0.

it can be manipulated to hold some other value ... $aArray[0] = 55764 ;etc...

No,

local aArray[1] = [0]

Unless I'm reading it wrong, it says to me that this is a 1-based array. not a 0-based array. And I don't understand what the [0] part all by itself means.

I agree, your needs are very confusing.

Why is it confusing to want to be able to assign a value to $aArray[0]? That is a 0-based array, right?

I'm a builder. Mr. Element #1 comes to me to build a house for him. I decide I want to give Mr. Element #1 house address 0. So I build the house ($aArray[0]), and name the house Mr. Element #1's name. ($aArray[0] = "Mr. Element #1").

This is not EXACTLY what my initial post was for, but the essence is the same.

Edited April 25, 2012 by SlowCoder74

[Melba23]

SlowCoder74,

Arrays in AutoIt always start with the [0] element. But when you declare an array you pass the total number of elements. So declaring an array like this:

Global $aArray[1] = [9999]

produces a single element array like this:

Element    Value

[0]        9999

That is why UBound will return a value of 1 for this array.

Does that make it clear?

M23

[guinness]

Seems like Melba23 got there before I did.

[Kip]

So if you wanted [0] and [1] you would declare it as

Local $aArray[2]

instead. It's just counting the elements starting from 0, so the offset will always be -1.

You start counting the elements from 1.

Their index, however, starts at 0.

E.g. the first element has an index of 0.

You can create an array like this:

Local $array[1]

That creates a array with one element (that can be accessed with index 0).

However, sometimes you may want to create an array and assign some initial values in one line, like this:

Local $array[3] = ["how", "are", "you"]

This creates an array with 3 elements and with the elements already filled in: 0: "how", 1: "are", 2: "you"

Edited April 25, 2012 by Kip

[SlowCoder74]

SlowCoder74,

Arrays in AutoIt always start with the [0] element. But when you declare an array you pass the total number of elements. So declaring an array like this:

Global $aArray[1] = [9999]

produces a single element array like this:

Element Value

[0]     9999

That is why UBound will return a value of 1 for this array.

Does that make it clear?

M23

Yes! That does make it clear. I'll have to adjust my thinking for this difference.

[JohnOne]

So you declare it like so

Local $aArray[1]

And you access and manipulate it like so

$aArray[0] = "whatever"

[SlowCoder74]

Thank you all, for sticking with me through this.

[LuI]

Wow, that's impressive: I found a 'problem' in AutoIT and it is fixed beforehand, allthough still in alpha-state ;-)

Guys, I wanted to crawl through a tree in a filesystem an do something with special sub-dirs. Those can show up in any position within the tree.

What I did (with LabVIEW) was creating an $array_of_pathes and initializing it by the start path. Than

While Ubound($array_of_pathes) ; is not empty

$ThisPath = _arrayPop($array_of_pathes) ; remove last element

$SubDirs=_FileListToArray($array_of_pathes, "*", 2)

; process elements of $SubDirs and append all elements to $array_of_pathes ; this may add some new elements

WEND

Rewriting it to AutoIT caused an runtime error because, at the beginning, the initialized array got emptied by the _arrayPop, which causes IsArray($array_of_pathes) to return 0.

While this can be avoided by introducing another element at index 0 and adopting the tests, it shows that at this time AutoIT does not support empty arrays.

If you change that behaviour you should definitely check all the UDF in _array and provide proper warnings about the changed behaviour. Nevertheless introducing empty arrays is a good idea IMHO!

Thanx for your work!

--

Greetings from Germany!

Dr. Uwe Frenz

[jchd]

This is partly wrong: AutoIt does support empty arrays. It's just that you can't create empty arrays from within AutoIt, but they may result from calls to COM objects. So indeed, the best way to deal with the case is to test explicitely.

EDIT: as Melba pointed out!

Edited June 19, 2012 by jchd

[Melba23]

jchd,

You meant to say that you CANNOT create empty arrays from within AutoIt - I hope.

[AdmiralAlkex]

So I was right.

If you change that behaviour

If? We got empty arrays in 3.3.9.5

Local $avArray[0]
ConsoleWrite(IsArray($avArray) & @LF)
ConsoleWrite(UBound($avArray) & @LF)

1

0

@jchd & Melba

Mmmk.

[jchd]

Ah, I always forget the alpha is public!

[AdmiralAlkex]

We still need someone to go through the _Array() functions and check and fix compatibility with empty arrays if anyone is interested

[Melba23]

AdmiralAlkex,

Mea culpa.

But how many members use the 3.3.9.5 alpha release? I confess I do not so that I do not (overly) confuse anyone who asks for help by suggesting solutions outside the current release (and beta if I must).

M23

[AdmiralAlkex]

AdmiralAlkex,

Mea culpa.

But how many members use the 3.3.9.5 alpha release? I confess I do not so that I do not (overly) confuse anyone who asks for help by suggesting solutions outside the current release (and beta if I must).

M23

I suppose you are right, but the alpha happens to be the best place to get empty arrays for now so....

Beards.

[Mechaflash]

Can AutoIt tell me the meaning of life?

Yes... but that's not until version 12.4.8.3.

Edited June 20, 2012 by mechaflash213