_ArraySearch Finds "BigString" inside a '0'

[LeCarre]

Whilst hacking out some code my app crashed, gee that never happens... 

Tracked it down to this odd return value.  As written it outputs "Found String at index: 0"

The commented out arrays function normally, and return Error 6. Not Found.

So it seems odd that Element 0 gets a hit if it is = 0.

Autoit v3.3.12.0

#include <Array.au3>

Local $Result = -1

Local $A[7] = [0,1,2,3,4,5,6]           ; Fail
;Local $A[7] = [1,2,3,4,5,6,7]          ; Ok
;Local $A[7] = ["1","2","3","4","5","6","7"]    ; Ok
;Local $A[7] = ["0","2","3","4","5","6","7"]    ; Ok

$Result = _ArraySearch($A,"BigString")

if $Result = -1 Then
    ConsoleWrite("Error: " & @Error & @CRLF)
Else
    ConsoleWrite("FoundString at index: " & $Result & @CRLF)
EndIf

ConsoleWrite(@AutoItVersion & @CRLF)

[JohnOne]

Try this and see if you can figure out why

#include <Array.au3>

Local $Result = -1

Local $A[7] = ["0","1","2","3","4","5","6"]           ; Fail
;Local $A[7] = [1,2,3,4,5,6,7]          ; Ok
;Local $A[7] = ["1","2","3","4","5","6","7"]    ; Ok
;Local $A[7] = ["0","2","3","4","5","6","7"]    ; Ok

$Result = _ArraySearch($A,"BigString")

if $Result = -1 Then
    ConsoleWrite("Error: " & @Error & @CRLF)
Else
    ConsoleWrite("FoundString at index: " & $Result & @CRLF)
EndIf

ConsoleWrite(@AutoItVersion & @CRLF)

[LeCarre]

Changing it to a string copies the result of the 3rd commented out Array which works fine.

I got the strange result when the Zero Element contained a number Zero.

I added

$A[0] = 0

right after your changes, and got the odd result again.

[eukalyptus]

This is because 0 = "String" returns True (line 48 in _Array_Search)

$sStr = "BigString"
$iNull = 0

If $iNull = $sStr Then
    ConsoleWrite("! " & $iNull & " = " & $sStr & @CRLF)
Else
    ConsoleWrite("+ " & $iNull & " <> " & $sStr & @CRLF)
EndIf

If $iNull == $sStr Then
    ConsoleWrite("! " & $iNull & " == " & $sStr & @CRLF)
Else
    ConsoleWrite("+ " & $iNull & " <> " & $sStr & @CRLF)
EndIf

[LeCarre]

Thanks for the clear example.  Not that I understand why 0 = String, But at least I know it now.

i'll have to be using some functions Differently.  UBound instead of Counts in Zero Elements.

[JohnOne]

When testing a number to a string, AutoIt converts the string to a numerical value.

If the string is not a numerical one it is 0.

[LeCarre]

Ah IC,  i'm getting C++ hunger pangs...

Changed _Arraysearch($Var,"String") to _Arraysearch($Var,"String",1) to avoid ZeroElement compare.

$iCompare Default took me for a joyride

Edited July 29, 2014 by LeCarre

[Richard Robertson]

"3278" equals the number 3278. "437f" equals the number 437. "BigString" equals the number 0 because there are no digits to parse.

It has to do with the AutoIt variant and implicit conversions across an equal sign. There is a case sensitive comparison, but no type strict comparison yet. A feature request could be posted for _ArraySearch that implements a custom "equals" that compares type as well as value.

Edited July 29, 2014 by Richard Robertson