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On 15/09/2009, at 11:35 PM, David FOXWELL wrote:
In the example of Pgm A, if PgmId= Pgm C, how would you code that
program's prototype?
Given that Pgm A doesn't know anything about Pgm C except that if it
calls RouterPgm giving the name of Pgm C then Pgm C will be invoked
with whatever parameters were passed to the router then there is no
reason to code a prototype for Pgm C in Pgm A.
Maybe *OMIT is not a good idea.
*OMIT is fine as long as you understand what you're doing with it.
Specifying *OMIT will cause a null pointer to be passed. This can be
passed on in turn as long as your code can handle it.
Based on the information you provided I would change the sequence of
the parameters and code the prototype for the router program as:
D ROUTER PR
D errMsg 1024 (as CONST OPTIONS(*VARSIZE) if input-only)
D PgmID 21 CONST OPTIONS(*VARSIZE)
D p1 ???? OPTIONS(*NOPASS : *OMIT)
D p2 ???? OPTIONS(*NOPASS : *OMIT)
D p3 ???? OPTIONS(*NOPASS : *OMIT)
I would put errMsg near the front because it looks like it is always
present. I would put the parameters last so I can easily add support
for more. I presume the parameters can be bi-directional therefore no
CONST. I would use both *NOPASS and *OMIT so I don't have to code
*OMIT for parameters after the last one I care about. This would be
both more flexible and cleaner to code. I may also choose to specify
other keywords depending on how the parameters are actually used.
The router program would have the prototypes for the various programs
it knows how to call or perhaps a generic prototype using a variable
name for the EXTPGM keyword or perhaps I would build an argument array
and use the CALLPGMV built-in MI instruction to pass the varying
argument list to the program named in PgmID.
Regards,
Simon Coulter.
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