Re: Calling CBLLE-procedures from a RPGLE-pgm?

S
Hello Geir,

You wrote:
>In an old RPGpgm, RPG1, I called a COBOLpgm, CBL1 with a PLIST  PLIS1
>containing PARAM1, PARAM2 and PARAM3.  The Call was like this:
>CALL 'CBL1' PLIS1(Standard OPM RPG, the parameters are bringing data into
>CBL1 and are receiving data from CBL1)

>RPG1 is converted into RPGLE1, and CBL1 is converted into CBLLE1, and
>bound together into one ILEpgm, RPGLE1.  I now need a CALLP(static call)
>instead of the old dynamic CALL, I have figured that out, but how do I
>prepare my parameterdefinitions to this inside RPGLE1??  Does anyone have
>a small example?

The simplest approach is to replace the CALL with CALLB, compile and bind.

However, using CALLP is better because it forces you to prototype the call
thus allowing the compiler to:
        a/ Verify that the parameters you pass match the parameters expected
by the called program
        b/ perform data conversions as required to coerce (or cast) the data
type you provide into the one preferred by the prototype.

Here is a quick example (you'll have to correct the column positions).

The prototype goes in a copy member (e.g., protos):

D doCobolStuff  PR                              EXTPROC('COBOLPGM')
D   param1                                10    CONST
D   param2                                 7  2 CONST
D   param3                                 5S 0 CONST

The RPG IV code looks like:

 /copy protos

D first         S               10
D second        S                7  2
D third         S                5S 0

C               CALLP       doCobolStuff( first : second : third )

Regards,
Simon Coulter.

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