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  1.  Home
  2. RPG400-L
  3. June 2007

Re: Defining DS to retrieve variable length data from API

Rory Hewitt wrote:

First, why are you defining the subfields as being overlays of another
subfield? Why not simply define them as e.g.:
...
It's a lot simpler and easier to read, I think. There's no reason to use
overlays (just like there isn't really a reason to name reserved fields in
RPGLE, so I leave them blank). It's all just style, though, since both
methods work fine.


For API receiver variables, I like to use overlays because it makes it easy to correlate the data structure to the documentation, and it makes it easy to skip fields you don't care about.

D RCVM0100 DS 65535 Qualified
D BytesRtn 10I 0 Overlay(RCVM0100:1)
D BytesAvail 10I 0 Overlay(RCVM0100:5)
D MsgID 7A Overlay(RCVM0100:13)
D RplDtaLenRtn 10I 0 Overlay(RCVM0100:45)
D RplDtaLenAvl 10I 0 Overlay(RCVM0100:49)




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