Re: How can I tell what parameters are required by a program?

[Henrik Krebs <hkrebs@xxxxxxxxx>]

>> Does anyone know of a technique to see what parameters are required
>> in a compiled program? I do not have the source. I want to find out
what
>> attributes (type and size) are required for each parm. I've looked
through
>> APIs but have not found one that could tell me this.

>>> Al, this would make for a interesting tool addition, although I'm
sure it
>>> would be easiest done in RPG...:)

Based om my freeware utility RTVPGMFLDA
(http://hkrebs.dk/rtvpgmflda.html) here is a method _almost_ to find
the field names and their attributes:

Retrieve # of parameters (real value in OPM-RPG, 255 in RPGLE).
Start debug, add a bkp at first MI (#0001) with a bkp-pgm doing a DUMP
and then an escape back. 
Then call the program with the retrieved number of (dummy) parameters
and get the dump listing all fields. The program will not do anything,
thus do no harm.
For each of the fields in the dump, do the following:
Start debug, add a bkp at first MI (#0001) with a bkp-pgm doing a
DSPPGMVAR and then an escape back.
Then call the program with zero parameters. This will result in
CPF1991 for each external parameter. The external parameter is either
an *ENTRY-parameter or a CALL-PLIST parameter or both. Which of theese
you have to guess (sorry).


Henrik
http://hkrebs.dk

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