Thanks, Mark. That makes sense to me. But off-hand, I can't think of any way
of doing this in "pure" oorexx. I would guess you actually make the swap (as
it were) in your C++ code?
If you can do this in ooRexx without any other language being involved,
please do let me know, 'cos if not, then I think it'll be important to
include this way of returning stuff in the Guide.
Atb,
Oliver
_____
From: Mark Miesfeld [mailto:[email protected]]
Sent: 10 January 2012 14:59
To: Open Object Rexx Developer Mailing List
Subject: Re: [Oorexx-devel] ooDialog - inout param in
method'mapWindowPoints'?
On Tue, Jan 10, 2012 at 5:48 AM, Oliver Sims
<[email protected]> wrote:
In Mark's userDlg.rex drag-drop sample program, there's a method
"mapWindowPoints".
The code is:
say 'Mouse position before map:' p
self~mapWindowPoints(self~DlgB~hwnd, p)
say 'p after map:' p
The parameter p is changed by the method implementation.
The parameter 'p' is what Corba IDL calls an "inout" parameter - it serves
to provide data to the method and the method also uses it to return data to
the caller. This is the first time I've seen this in Object Rexx. So I
wondered if it's intended to keep this behavior, or to change it so that it
returns data in the usual way?
It's intended to be this way. "returns data in the usual way" seems a
little bit of a questionable statement to me. According to who is the
"usual" way? <grin>
This type of method, transforming some object, is common in the new methods
I've introduced in ooDialog.
In places where it is used, and mapWindowPoints() is a good example, the
existing values of the object are not needed, it is the transformed values
that are needed. There is no need to have 2 separate objects. In addition,
it allows the method to return a success indicator for methods where the
data returned does not have an obvious failure value. In this case it
returns false on failure.
--
Mark Miesfeld
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