Easy Array Question

[danny0]

I'm new to autoit. I know this is an easy question, but how do you delete an array and its values so it can be declared again with new values?

[FireFox]

@danny0

Welcome to autoit forum

Example :

;Double array
Local $array[10][10]
$array[5][5] = "something"
MsgBox(64, "array", $array[5][5])
$array[5][5] = "" ;delete something to nothing
MsgBox(64, "array", $array[5][5])

;simple array
Local $array[10]
$array[5] = "something"
MsgBox(64, "array", $array[5])
$array[5] = "" ;delete something to nothing
MsgBox(64, "array", $array[5])

Cheers, FireFox.

Edited January 3, 2009 by FireFox

[BugFix]

Hi and Welcome!

There are 2 ways.

- You declare an empty array and copy it to the one, you want to "delete". Or you can use ReDim.

Global $aEmpty[1]
Global $array[200] ; or size u want
;...
;...
$array = $aEmpty ; now is UBound($array) = 1 ==> an empty element

;=============================================
; with ReDim

ReDim $array[1]
$array[0] = ''

Edited January 3, 2009 by BugFix

[danny0]

@danny0

Welcome to autoit forum

Example :

Local $array[10][10]
$array[5][5] = "something"
MsgBox(64, "array", $array[5][5])
$array[5][5] = "" ;delete something to nothing
MsgBox(64, "array", $array[5][5])

Cheers, FireFox.

Thanks! That worked great.

[SamGleske]

To erase an array (maybe because it is a large global array and you want to free the memory), simply assign a single value to it:

$array = 0

That was quoted from the documentation.

http://www.autoitscript.com/autoit3/docs/keywords/Dim.htm

SAM

[PsaltyDS]

ReDim is not the answer. That changes the number of elements in the array, and only loses the existing data if you change the number of dimensions.

Setting the array variable to a non-array value, like $aArray = 0, will do it just fine.

But if you want the array to still exist, with the elements empty, then simply re-declare the array:

Global $aArray[10][10] ; original array

     ; Lots of stuff happens, lots of old data in array

Global $aArray[10][10] ; re-declare to empty (elements are all still there, but empty now)

     ; Continue to use freshly emptied array...

Edited April 7, 2010 by PsaltyDS

[zalomalo]

This is not enought. If you have custom functions with local arrays you dare to get trash from it.

This is the case in the usefull Call() calls, with a array as argument and 'CallArgArray' in array[0]. You will get all wrong.

Is needed wipe manually, example:

Func __CustomCall($sCadenaLlamada)
;[....]
   Local $aArgvs=StringSplit($sArgvs,',',1)
   Local $coder=$aArgvs[0]
   $aArgvs[0]='CallArgArray'
   $CallReturn=Call($sFuncName,$aArgvs)
   For $i=0 To $coder                  ; Wipe Array
      $aArgvs[$i]=Null
   Next
   If @error=0xDEAD Or @extended=0xBEEF Then
      $coder=0
   Else
      $coder=$CallReturn
   EndIf
;[....]
Return($coder)

Cheers.

Edited February 7, 2015 by zalomalo

[kaisies]

Redim $array[0]

[zalomalo]

ReDim is not the answer.

 

Indeed, is Not enough.

Redeclare, neither.

Wipe it every component inside is the only way to not get unvalid old data if you dont know if $Array[0] is real and care of it.

Edited February 9, 2015 by zalomalo

[JLogan3o13]

zalomalo, did you not noticed that this thread is over 4 years old, and the OP hasn't been active in 5? Please don't resurrect old threads needlessly.

[zalomalo]

Sorry, my fault. Im silly.