Vista - Are sub-routines parameters called by reference or called by value?

When I call a sub-routine in a VBscript and I want to pass
two System.Collections.ArrayList objects
are these objects then passed by value or by reference?

In other words: are possible modifications (done in the subroutine) visible
OUTSIDE the subroutine or not?

Example:

Set arr1 = CreateObject("System.Collections.ArrayList")
Set arr2 = CreateObject("System.Collections.ArrayList")
.....<fill arr1 and arr2>...
.....

call mycalc

....

sub mycalc parm1 parm2
...
parm1.removeAt 1
...
end sub

Thomas

On Mar 25, 1:40*pm, t.lebre...@xxxxxx (Thomas Lebrecht) wrote:Seems like this should be easy enough to figure out. I don't know the
answer of the top of my head, but I do know that VBScript was based
off of VB6 so it probably works the same way VB6 works. And in VB.NET,
which succeeded VB6, ByVal is the default.

"Thomas Lebrecht" <t.lebrecht@xxxxxx> schrieb
Is there a reason why VBscript questions are also sent to the VB.Net group
lately?

In VB.Net, without specifying ByVal or ByRef, ByVal is the default. See
"Passing Mechanism" under the "Rules" headline:
http://msdn.microsoft.com/en-us/library/cbs7z96t.aspx


Armin

"Thomas Lebrecht" <t.lebrecht@xxxxxx> wrote in message
news:49ca6c9d$0$32676$9b4e6d93@xxxxxx-online.net...In VBScript if the argument is a variable, array, or array element, it is
passed "by reference", unless you specify ByVal. If the argument is an
expression it is passed "by value". This is an instance where the behaviour
of VBScript is different from VB (classic). I try to always specify ByVal or
ByRef to avoid confusion.

--
Richard Mueller
MVP Directory Services
Hilltop Lab - http://www.rlmueller.net
--

Thomas Lebrecht wrote:hi Thomas,

Aside from the comments above, imho vbs parameters are
passed "ByRef" by default. The only exception I know is
when you explicitly call for "ByVal" in your Sub or
Function definition.

It more-or-less has to be byref, otherwise you could
never pass out values through the parameters of a
function or sub.

There is also (that mysterious) "coercion" in vbs.
To some limited extent, vbs will look at the calling
sequence of objects being called, and "coerce" the
parameters to fit (i.e., force the parameters into
agreement as to type). I have never seen the "rules"
of coercion (i.e., when it works and when it doesn't
work(, but I have seen cases of it working. However,
it does not appear to be useful in your case.

As far as using net framework objects with vbs is
concerned, I have seen a few limited examples, but in
general the net framework is designed for use by dot-net
languages.

cheers, jw
____________________________________________________________

You got questions? WE GOT ANSWERS!!! ..(but, no guarantee
the answers will be applicable to the questions)

Because the poster is often confused about which group is appropriate for
posting a particular question, usually (as in this case) due to some
confusion about the distinction between the .NET runtime and the language
used to access it.

For anyone who bothers to read this, if you're using a .NET from
VBScript/Jscript or any other Active Scripting language, posting to a .NET
language group isn't likely to net you any useful help; you're not using a
..NET language. It might be helpful to post in a core .NET group if it
appears that the issue might be confusion about how the component behaves,
but for a language issue - like the ByRef vs. ByVal behavior of VBScript -
it's best to post to the VBScript language group.

"Armin Zingler" <az.nospam@xxxxxx> wrote in message
news:uKsgCcXrJHA.3864@xxxxxx

Richard Mueller [MVP] <rlmueller-nospam@xxxxxx> typed:
Now we are so clever as like before, after all here have made known
their different opinions. If somebody has by chance a source for what
happens by the parametre handling with functions? Besides, also I could
observe already very much different behaviour of the Windows-Script-Host
interpreter. I would be very glad with a solution from reliable source.

The explanation advanced by you corresponds, at least, to my experiences
in the earliest. TIA

--
ЯR

"Ruediger Roesler" <administrator@xxxxxx> wrote in message
news:49cabe3b$0$32665$9b4e6d93@xxxxxx-online.net...This link from "Microsoft Windows 2000 Scripting Guide" explains (near the
bottom of the page):

http://www.microsoft.com/technet/scr..._vbs_zuue.mspx

I also referred to "Windows 2000 Windows Script Host" by Tim Hill before my
original reply.

--
Richard Mueller
MVP Directory Services
Hilltop Lab - http://www.rlmueller.net
--

I can't find the original post via Google Groups, unfortunately, but there
IS a fairly complete listing of how byval/byref works in various ways when
calling a procedure that was provided by Eric Lippert, one of the key
VBScript developers. This link:

http://classicasp.aspfaq.com/general...-vbscript.html

appears to be the entire post as I recall it now.

"Richard Mueller [MVP]" <rlmueller-nospam@xxxxxx> wrote in
message news:OhJAg$arJHA.3848@xxxxxx

By reference as this is the default behavior of all VB pre .Net languages
( including VBA , VBS )

HTH

Michel



"Thomas Lebrecht" <t.lebrecht@xxxxxx> schreef in bericht
news:49ca6c9d$0$32676$9b4e6d93@xxxxxx-online.net...