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  • Deye changed the title to why this restriction?

So, you're wanting to know why an empty array is returned when you pass an empty string to ProcessList()?

Only a dev can say for sure, but my guess is that ProcessList detects the existence of the parameter without checking for "", Default, etc.

P.S. $iPID isn't a great name here IMO since doesn't contain and integer or a PID ūüėČ

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I'd say it's more of an over-sight. The documentation says that it searches for a name when it is specified, so technically you did specify a name albeit it doesn't contain any words, so it doesn't match anything.

Did you try with values other than an empty string? I'd suggest trying Default, 0, Null, False etc.

In any case, this should be filed as a bug so that the check also takes an empty string into account.

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@Danp2 Right, I'd guess there is type casting happening here which converts all values to strings, and all of the values except 0 and False should turn into empty strings. In any case, doesn't look like it's possible to achieve the default behavior without using hacks like this:

Func ProcessListFixed($iPID = "")
    If $iPID = "" Then
        Return ProcessList()
    Else 
        Return ProcessList($iPID)
    EndIf
EndFunc

 

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1 hour ago, Danp2 said:

So, you're wanting to know why an empty array is returned when you pass an empty string to ProcessList()?

Only a dev can say for sure, but my guess is that ProcessList detects the existence of the parameter without checking for "", Default, etc.

P.S. $iPID isn't a great name here IMO since doesn't contain and integer or a PID ūüėČ

@Danp2 function should check/detect the existence of parameter but the question os what it should to do when there is no parameter given ?

Taking a look into documenation:

https://www.autoitscript.com/autoit3/docs/functions/ProcessList.htm

Quote

ProcessList

Returns an array listing the currently running processes (names and PIDs).

ProcessList ( ["name"] )

Parameters

name [optional] If a name is given only processes of the same name will be returned.

as you can see the "name" parameter is optional, and descripition for parameters doesn't say anything what will do when the parameters is not given.
There is statement 

Quote

Returns an array listing the currently running processes

So we can only guess that it should return all running processes.

I think we must wait to check it by dev I propose to wait for @jpm  presence.
Hope he will be able answer soon.

 

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But first of all.

@Deye please check this code:

#include <Array.au3>

Example()

Func Example()
    ; Display a list of processes returned by ProcessList
    Local $aProcessList = ProcessList()
    _ArrayDisplay($aProcessList, '$aProcessList')
EndFunc   ;==>Example

And say if it works for you or not ?
And what you expected in your case ?

EDIT:
As so far I think that function work as intended, at least reading HelpFile:

Quote

Parameters

name [optional] If a name is given only processes of the same name will be returned.

Optional mean that when you give any name then it must exist, if the name is empty string then it is a fact that such process should never exist.
So what you expected ?

As a solution to your needs you should use @TheDcoder proposals:

26 minutes ago, TheDcoder said:

In any case, doesn't look like it's possible to achieve the default behavior without using hacks like this:

Func ProcessListFixed($iPID = "")
    If $iPID = "" Then
        Return ProcessList()
    Else 
        Return ProcessList($iPID)
    EndIf
EndFunc

 

 

Edited by mLipok

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Thanks mLipok,

More or less of the workarounds I know of
The point mainly referred to the natural idea that the function "should" be able to accept a variable (in the main case of our interest - coding Etc.)

 

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You should avoid passing empty string, by your own, and not expecting that AutoIt do it for you internally.

Edited by mLipok

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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 * 

OpenOffice/LibreOffice/XLS Related: WriterDemo.au3 * XLS/MDB from scratch with ADOX

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 * IE Embedded Control Versioning (use IE9+ and HTML5 in a GUI) * PDF Related: * How to get reference to PDF object embeded in IE * IE on Windows 11 * 

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 *

I also encourage you to check awesome @trancexx code:  * Create COM objects from modules without any demand on user to register anything. * Another COM object registering stuff * OnHungApp handler * Avoid "AutoIt Error" message box in unknown errors  * HTML editor * 

winhttp.au3 related : * https://www.autoitscript.com/forum/topic/206771-winhttpau3-download-problem-youre-speaking-plain-http-to-an-ssl-enabled-server-port/

"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."

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