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Spiff59

Empty function arguments

7 posts in this topic

#1 ·  Posted (edited)

I thought something like this is supposed to use the default for the second parameter?

$parm1 = "xxx"
$parm2 = ""
test($parm1, $parm2)

Func Test($p1 = "1111", $p2 = "2222")
    Msgbox(1,"",$p1 & @CRLF & $p2)
EndFunc

I find no way (anymore) to get the "2222" value assigned to $p2.

Something change lately?

typo

Edited by Spiff59

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Dont pass anything as the second parameter and it will use your default, if you pass a second parameter it overwrites the default.

$parm1 = "xxx"
$parm2 = ""
test($parm1)

Func Test($p1 = "1111", $p2 = "2222")
    Msgbox(1,"",$p1 & @CRLF & $p2)
EndFunc

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#3 ·  Posted (edited)

Nothing has changed. It's always been like that and Yoriz gave you the correct way.

In trying to do what you are doing your function would have to contain something like

If NOT $p2 Then $p2 = "2222"

Edited by GEOSoft

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You can as well use the Default parameter placeholder in the call part, but that requires the function tests it with If IsKeyword($p2) Then $p2 = '2222'. Many functions in the standard UDFs work this way. This allows you to explicitely pass a third effective parameter while leaving the second to the default value and, more importantly, not caring what the default value is.


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#5 ·  Posted (edited)

It seems different...

I'm fighting my way through the Alzheimers...

I guess I'm just imagining the way I think it ought to behave.

So with a multi-parameter function, where you want to modify the default for just the 6th parament, you'd have to have coded the function to check for, and replace, empty strings (or "Default" or -1, etc) for each the proceeding arguments, or else force the user to provide the default values all the way out to the parm they want to override.

Not very convenient.

Thanks for refreshing my memory.

Edited by Spiff59

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Null parameters, enumerated parameters and named parameters are not in the AutoIt v3 syntax.

_myFct(3, 'abc', , , 19) :idea:

_myFct(#2:'abc', #1:3, #5:19) :)

_myfct(handle=3, count=19, prefix='abc') :(


This wonderful site allows debugging and testing regular expressions (many flavors available). An absolute must have in your bookmarks.
Another excellent RegExp tutorial. Don't forget downloading your copy of up-to-date pcretest.exe and pcregrep.exe here
RegExp tutorial: enough to get started
PCRE v8.33 regexp documentation latest available release and currently implemented in AutoIt beta.

SQLitespeed is another feature-rich premier SQLite manager (includes import/export). Well worth a try.
SQLite Expert (freeware Personal Edition or payware Pro version) is a very useful SQLite database manager.
An excellent eBook covering almost every aspect of SQLite3: a must-read for anyone doing serious work.
SQL tutorial (covers "generic" SQL, but most of it applies to SQLite as well)
A work-in-progress SQLite3 tutorial. Don't miss other LxyzTHW pages!
SQLite official website with full documentation (may be newer than the SQLite library that comes standard with AutoIt)

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