Re: What's the difference?

You had BIFs, null support, and extended operations in RPG III?

Gary Guthrie


rob@dekko.com wrote:
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> Omitted parms in the middle.
>
> In OPM this was done by checking, not PARMS, but the address of each
> field.  For example, if I called a program using parm1 and parm4 but not
> parm2 nor parm3.  The called program would check the address of parm2 by
> using if %addr(parm2)=*null.  If it was null do not do anything with it.
> Do not even try to clear it, move blanks or zeros to it, not anything.
> Otherwise you get the MCH error.
>
> When would this ever happen in real life?  When using a command to drive
> your program.  For example I made a command called RTVJOBD.  This command
> calls a rpg program.  Now, the program using this command may not care
> about some obscure job description property, thus it won't put a variable
> name in that parameter.  If the parameter is not null then I assign the
> value of that variable from a result field from the api to retrieve a job
> descriptions attributes.