Unlimited arguments in function

[zwierzak]

Hello,

I would like to ask you for help once more

I would like to write a function, that can recieve n-parameters. Here is an example:

Func test(1[,...n])
;...
EndFunc

Here, the function requires at least 1 argument. Later on, inside the function it will be determined, whether the function needs 1,2 or 3 arguments. For example, when i call test(1) the function in fact will require 3 more arguments, so it should look like that: test(1,10,15,5). To be precise, when I for example put 2 as a first argument - the function will need 5 more arguments, so the call process should look like: test(2,10,15,5,6,20). I hope that you've managed to understand what is my desire

Here is an example from help(DllCall function)

DllCall ( "dll", "return type", "function" [, type1, param1 [, type n, param n]] )

Edited September 26, 2011 by zwierzak

[Mat]

The only way to ensure the number of arguments has a ridiculously big limit is to pass an array. I won't say unlimited though

[water]

As the number of parameters to the function is variable you can only define 1 parameter as obligatory the rest has to be optional. Your script has to decide how many parameters are needed and then has to check if the user has passed all neccessary parameters.

Func Test($Obligatory_Parameter, $Optional_Parameter1 = "", $Optional_Parameter2 = "" ....)
; Your code
EndFunc

[zwierzak]

You mean that it is better to make it this way?

Func Test($Obligatory_Parameter, $Array_Parameters)
;...
Endfunc

I wonder if you could give me a working example?

Edited September 26, 2011 by zwierzak

[Mat]

#include <Array.au3>

Local $args[3] = [10, 15, 5]
Test(1, $args)

Local $args2[5] = [10, 15, 5, 6, 20]
Test(2, $args2)

Func Test($Obligatory_Parameter, $Array_Parameters)
    MsgBox(0, 'Test: ' & $Obligatory_Parameter, _ArrayToString($Array_Parameters, ','))
EndFunc

In reality you'd cheat and use:

#include <Array.au3>

Test(2, StringSplit('10,15,5,6,20', ',', 2))

Func Test($Obligatory_Parameter, $Array_Parameters)
    MsgBox(0, 'Test: ' & $Obligatory_Parameter, _ArrayToString($Array_Parameters, ','))
EndFunc

That should work in theory, though I haven't tested it.

[zwierzak]

Isn't there any other way to make this function look normal? I mean that I am writing an UDF and i wouldn't like the users to type something like this:

Test(2, StringSplit('10,15,5,6,20', ',', 2)) when calling a function. I would like it to look like Test(2,10,15,5,6,20). Is there any way to place this StringSplit part inside the function?

The developers of au3 did manage to place this part inside the function when I look at dllcall

Edited September 26, 2011 by zwierzak

[AdmiralAlkex]

Look at water said above and look at @NumParams in the helpfile

[BrewManNH]

You'd be better off using an array to send to the function, that way the array can be of any size, which can change every time you call the function.

[Spiff59]

The variation of the same thing that best "looks normal" might be just wrapping the parms in quotes:

#include <Array.au3>
Test(1, "10, 15, 5, 6, 20")
Func Test($Obligatory_Parameter, $Array_Parameters)
    $parms = StringSplit($Array_Parameters, ",")
_ArrayDisplay($parms)
EndFunc

[Mat]

Be very careful with spaces. Could give parameters a rather different meaning.

[zwierzak]

Ok, thank you very much guys. You've helped me a lot! The topic can be closed now