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I have a number of RPGLE's as CPP's for RTV type commands. Instead of the *NULL test, I use CEETSTA in a loop to set an array of booleans to indicate whether a parm was passed or not. Then, in the SetReturnVars() function, I test the Boolean to decide if I set the value. Named constants make it very readable.
Roger Harman
COMMON Certified Application Developer – ILE RPG on IBM i on Power
-----Original Message-----
From: RPG400-L [mailto:rpg400-l-bounces@xxxxxxxxxxxxxxxxxx] On Behalf Of Scott Klement
Sent: Wednesday, June 10, 2020 6:30 PM
To: rpg400-l@xxxxxxxxxxxxxxxxxx
Subject: Re: Getting a MCH3601 Pointer not set
Yes, you can use this with a *CMD interface when a parameter is not passed.
However, it is NOT reliable for a straight CALL where a parameter is
left off. The area of memory where the pointer to the parameter
would've been is not set at all... so if that spot in memory happens to
be a valid pointer, it'll think the parameter was passed and it won't be
reported as *NULL. (But, if its not a valid pointer, your technique
would work... but you should never rely on that.)
On 6/10/2020 5:14 AM, Åke Olsson wrote:
You could check if the address of the parameter is NULL - then the parameter
was not passed.
Like this
IF %ADDR([variable_name] = *NULL;
.... do something or whatever...
ENDIF;
I have found this particularily useful when using RPG programs as CPP for
commands that return values since you really do not know which values are
requested.
midrange.com
