ILE RPG & List API's

[bvining@xxxxxxxxxxxx]

Nigel,

>From a performance point of view, using the ILE RPG "pointer method" is
the way to go.  You avoid the calls to QUSRTVUS, and you do not have
to pre-allocate storage for your data structures or arrays.  What you
do is base (BASED) your structures on the user space storage, and
increment directly through the user space.

Though slightly dated (doesn't use all the latest pointer support
currently found in ILE RPG) there are ILE RPG examples of using BASED
structures in the System API Programming manual (not the Reference).
One example would be using the List Object API, which is found in
appendix B of the manual.

Bruce Vining

>Hi All,
>
>Could someone give me some advice regarding using ILE RPG and list
>API's via user spaces.  As you know you can manipulate data in user
>spaces via pointers in ILE RPG. If I going to be retrieving data via
>an API into a user space and I have no idea how much data is going to
>be returned, what do I set the Data Structure/Array Size to?
>
>If I set it 'Really Big' this will obviously have a negative impact on
>the amount of storage that the pgm uses.
>
>You can't use dynamic allocation because I don't know how items are
>going to be returned via the API.
>
>The pointer method seems to be at a disadvantage when compared with
>using the QUSRTVUS and incrementing the offset.
>
>Please someone tell me I got it wrong and that the pointer method is
>the way to go.
>
>Nigel Percy
>

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