[AccessD] Feeding an paramarray to a paramarray

You are correct of course, the paramarray is an array of variant.  The for
each iterator does not know how to handle an array in the array.


John W. Colby
Colby Consulting
www.ColbyConsulting.com 
-----Original Message-----
From: accessd-bounces at databaseadvisors.com
[mailto:accessd-bounces at databaseadvisors.com] On Behalf Of Drew Wutka
Sent: Wednesday, March 12, 2008 12:21 PM
To: Access Developers discussion and problem solving
Subject: Re: [AccessD] Feeding an paramarray to a paramarray

Ah, here's the problem.  

Function Something(ParamArray tmpGroup() as variant)

Calling Something("1","2","3","4") isn't sending 'Something' an array.
ParamArray is required to be the last argument.  It is also ByVal.  It's not
'accepting' an array (though it will), it is accepting multiple arguments
and turning them into an array.

If we do this:
Dim tmp(1)
Tmp(0)=1
Tmp(1)=2
Something(tmp)

What we get is an array WITHIN an Array.  Tmp is ONE argument.  The
Something Function actually creates an array with the first element as the
tmp array.  If we send THAT array to another function, we are getting an
array with the first element the paramarray array, with it's first element
the tmp array.  If we send it through again, we'd get a four level deep
array.

So, it is sending the data through, but the way you are dealing with the
ParamArray argument in the second function is based on the conceptual error
that you are getting a single level array.

Let me see if I can give you a better work around.

Drew

-----Original Message-----
From: accessd-bounces at databaseadvisors.com
[mailto:accessd-bounces at databaseadvisors.com] On Behalf Of jwcolby
Sent: Wednesday, March 12, 2008 10:49 AM
To: 'Access Developers discussion and problem solving'
Subject: Re: [AccessD] Feeding an paramarray to a paramarray

Drew,

LOL.

>Ya learn something new everyday.

Would you speak into the microphone please...

The "solution" did the trick, but at the expense of eliminating the ability
to pass in multiple arguments to SecondParamfunction.  It is the keyword
ParamArray that allows the passing in of multiple arguments.  It is often
useful to have two functions, BOTH of which have param arrays, and be able
to call either one directly, but also call one from the other.  It is the
"call one from the other" that is not possible if both have paramarrays.

ParamArrays are indeed a neat trick and one I use all of the time.  What
would be REALLY cool would be to be able to pass into TWO paramarrays but
that is syntactically impossible - there is no way to denote where
parameters aimed at one array ends and where the parameters aimed at the
next array begins.  The language could be expanded to allow a semicolon to
denote the end of one list and the beginning of the next but that doesn't
currently exist.

John W. Colby
Colby Consulting
www.ColbyConsulting.com
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