Re: problem passing a MODS

Jon,

A quick question that occurred to me:

If I define a MODS in one program, set the occurrence to 1 and pass it to a
second program and that called program then loads the MODS with data, does
the called program need to reset the occurrence to 1 before returning to the
calling program?

I'm assuming here that obviously the MODS isn't passed using CONST or VALUE
or anything like that.

Rory

On Tue, Feb 22, 2011 at 11:24 AM, Jon Paris <jon.paris@xxxxxxxxxxxxxx>wrote:

On Feb 22, 2011, at 1:00 PM, rpg400-l-request@xxxxxxxxxxxx wrote:

I'd like to know why this code crashes on the SECOND call to mysp :
In mysp, at the execution of "eval parmError = blank", I'm getting

MCH3601 'pointer not defined for referenced memory position'

If I do : "%OCCUR ( myMODS ) = 1;" before the call to mysp, the problem

does not occur.

When a MODS is passed as a parm the address of the current occurrence is
what is passed. The writer of the second program had it right in a way in
that only one instance is ever (effectively) passed.

Without knowing what the called routine does or how the external DS is
defined, I'd have to just guess that the code attempts to retrieve data
beyond the scope of the item or something.

Unless you _want_ to pass occurrences other than 1 as the starting point
you should always set the occurrence to one before passing a MODS as a parm.


Jon paris

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