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maniootek

Function called 'empty' from PHP languange in Autoit?

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Global $var = "This is a test"

If not (IsDeclared("var") and $var <> 0) Then Msgbox(0,"", "$var doesn't exist or is empty")

Says $var doesn't exist or is empty, but it's not empty. One of the issues I've discovered in autoit is the implicit conversion of string to number. If the string is a number then this is okay but if the string is a normal string then it implicitly converts to 0, as is the case in your example. This is why I use ==, to compare type and value. That works in most cases.

Global $aVars[] = [0, "0", "This is a test", "", 42, "33"]

For $i = 0 To UBound($aVars) - 1
    If (StringLen($aVars[$i]) = 0 Or $aVars[$i] == 0) Then
        MsgBox(0, "", "$aVars[" & $i & "] (" & $aVars[$i] & ") is empty")
    Else
        MsgBox(0, "", "$aVars[" & $i & "] (" & $aVars[$i] & ") is not empty")
    EndIf
Next

Using my example then it will execute as you would think it should.

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What do you think about it?

#include <MsgBoxConstants.au3>

Local $aArray[2] = [1, "Example"]
Local $aArray2[0]
Local $dBinary = Binary("")
Local $bBoolean = False
Local $hWnd = WinGetHandle("notexistingwindow")
Local $iInt = 0
Local $fFloat = 0.0
Local $oObject = ObjCreate("Scripting.Dictionary")
Local $sString = ""
Local $tStruct = DllStructCreate("wchar[256]")
Local $vKeyword = Default
Local $fuFunc = ConsoleWrite
Local $fuUserFunc = Test
Func Test()
EndFunc   ;==>Test

MsgBox($MB_SYSTEMMODAL, "", _
        "Variable Types" & @CRLF & @CRLF & _
        "$aArray : " & @TAB & @TAB & "IsEmpty: " & IsEmpty($aArray) & @CRLF & _
        "$aArray2 : " & @TAB & @TAB & "IsEmpty: " & IsEmpty($aArray2) & @CRLF & _
        "$dBinary : " & @TAB & @TAB & "IsEmpty: " & IsEmpty($dBinary) & @CRLF & _
        "$bBoolean : " & @TAB & "IsEmpty: " & IsEmpty($bBoolean) & @CRLF & _
        "$hWnd : " & @TAB & @TAB & "IsEmpty: " & IsEmpty($hWnd) & @CRLF & _
        "$iInt : " & @TAB & @TAB & "IsEmpty: " & IsEmpty($iInt) & @CRLF & _
        "$fFloat : " & @TAB & @TAB & "IsEmpty: " & IsEmpty($fFloat) & @CRLF & _
        "$oObject : " & @TAB & "IsEmpty: " & IsEmpty($oObject) & @CRLF & _
        "$sString : " & @TAB & @TAB & "IsEmpty: " & IsEmpty($sString) & @CRLF & _
        "$tStruct : " & @TAB & @TAB & "IsEmpty: " & IsEmpty($tStruct) & @CRLF & _
        "$vKeyword : " & @TAB & "IsEmpty: " & IsEmpty($vKeyword) & @CRLF & _
        "MsgBox : " & @TAB & @TAB & "IsEmpty: " & IsEmpty(MsgBox) & @CRLF & _
        "$fuFunc : " & @TAB & @TAB & "IsEmpty: " & IsEmpty($fuFunc) & @CRLF & _
        "Func 'Test' : " & @TAB & "IsEmpty: " & IsEmpty(Test) & @CRLF & _
        "$fuUserFunc : " & @TAB & "IsEmpty: " & IsEmpty($fuUserFunc))

Func IsEmpty($data)
    If IsArray($data) Then Return -1
    If StringLen($data) = 0 Then Return True
    If $data = 0 Then Return True
    If $data = Default Then Return True
    Return False
EndFunc   ;==>IsEmpty

 

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Why you are using this:

If IsArray($data) Then Return -1

I think this should be like this:

If IsArray($data) Then 
    If UBound($data) Then Return False
    Return True
EndIf

Edit:

or even beter

If IsArray($data) Then Return (UBound($data) > 0)

 

Edited by mLipok

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"Homo sum; humani nil a me alienum puto" - Publius Terentius Afer
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:naughty:  :ranting:, be  :) and       \\//_.

Anticipating Errors :  "Any program that accepts data from a user must include code to validate that data before sending it to the data store. You cannot rely on the data store, ...., or even your programming language to notify you of problems. You must check every byte entered by your users, making sure that data is the correct type for its field and that required fields are not empty."

Signature last update: 2020-09-20

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There is difference beetwen entire array and array element.

Array is empty when UBound = 0
Array element is empty when desired element is =0 or is ='' or is =NULL - But this depends on the intended use  of the array variable.
 

 


Signature beginning:   Wondering who uses AutoIT and what it can be used for ?
* GHAPI UDF - modest beginning - communication with GitHub REST API Forum Rules *
Include Dependency Tree (Tool for analyzing script relations)
ADO.au3 UDF     POP3.au3 UDF     XML.au3 UDF    How to use IE.au3  UDF with  AutoIt v3.3.14.x  for other useful stuff click the following button

Spoiler

Any of my own code posted anywhere on the forum is available for use by others without any restriction of any kind. 

My contribution (my own projects): * Debenu Quick PDF Library - UDF * Debenu PDF Viewer SDK - UDF * Acrobat Reader - ActiveX Viewer * UDF for PDFCreator v1.x.x * XZip - UDF * AppCompatFlags UDF * CrowdinAPI UDF * _WinMergeCompare2Files() * _JavaExceptionAdd() * _IsBeta() * Writing DPI Awareness App - workaround * _AutoIt_RequiredVersion() * Chilkatsoft.au3 UDF * TeamViewer.au3 UDF * JavaManagement UDF * VIES over SOAP * WinSCP UDF * GHAPI UDF - modest begining - comunication with GitHub REST APIErrorLog.au3 UDF - A logging Library *

My contribution to others projects or UDF based on  others projects: * _sql.au3 UDF  * POP3.au3 UDF *  RTF Printer - UDF * XML.au3 UDF * ADO.au3 UDF SMTP Mailer UDF * Dual Monitor resolution detection * * 2GUI on Dual Monitor System * _SciLexer.au3 UDF * SciTE - Lexer for console pane

Useful links: * Forum Rules * Forum etiquette *  Forum Information and FAQs * How to post code on the forum * AutoIt Online Documentation * AutoIt Online Beta Documentation * SciTE4AutoIt3 getting started * Convert text blocks to AutoIt code * Games made in Autoit * Programming related sites * Polish AutoIt Tutorial * DllCall Code Generator * 

Wiki: Expand your knowledge - AutoIt Wiki * Collection of User Defined Functions * How to use HelpFile * Good coding practices in AutoIt * 

IE Related:  * How to use IE.au3  UDF with  AutoIt v3.3.14.x * Why isn't Autoit able to click a Javascript Dialog? * Clicking javascript button with no ID * IE document >> save as MHT file * IETab Switcher (by LarsJ ) * HTML Entities * _IEquerySelectorAll() (by uncommon) * IE in TaskScheduler

PDF Related:https://www.autoitscript.com/forum/topic/177368-how-to-get-reference-to-pdf-object-embeded-in-ie/ *

I encourage you to read: * Global Vars * Best Coding Practices * Please explain code used in Help file for several File functions * OOP-like approach in AutoIt * UDF-Spec Questions *  EXAMPLE: How To Catch ConsoleWrite() output to a file or to CMD *

"Homo sum; humani nil a me alienum puto" - Publius Terentius Afer
"Program are meant to be read by humans and only incidentally for computers and execute" - Donald Knuth, "The Art of Computer Programming"
:naughty:  :ranting:, be  :) and       \\//_.

Anticipating Errors :  "Any program that accepts data from a user must include code to validate that data before sending it to the data store. You cannot rely on the data store, ...., or even your programming language to notify you of problems. You must check every byte entered by your users, making sure that data is the correct type for its field and that required fields are not empty."

Signature last update: 2020-09-20

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