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  1.  Home
  2. RPG400-L
  3. June 2020

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.




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