Re: Prototype for a command parameter.

["Simon Coulter" <shc@xxxxxxxxxxxxxxxxx>]

Hello Rob,

You wrote:
>I understand the 0002 is the number of elements.  Why does each element
>begin with hex0001?

Because your PARM definition says VARY(*YES) which causes each value to be
prefixed with the length.  In your example X and Y are both 1 byte long so
each element is prefixed with a BIN(2) length and the whole lot is prefixed
witha BIN(2) count.  Note that each element still occupies the full 10 byte
length you specified -- the empty bytes are padded with blanks.

All the intricacies of element lists are explained (with examples and
diagrams) in the CL Programming Guide in Chapter 9.

To paraphrase you need RPG IV definitions much like the following:

D program    PI
 * (2-byte count + (300 elements * 10) + (300 elements * 2)
D   objList                  3602

D objListDS  DS
D   objCount                    5I 0
D   objElem                    12     DIM(300)
D      objLen                   5I 0  OVERLAY(objElem:1)
D      objName                 10     OVERLAY(objElem:3)

C                       EVAL     objListDS = objList

then iterate over the array for as many elements as objCount says you
received.

Regards,
Simon Coulter.

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