Re: CL parameter problem -- MIDRANGE-L

Using RTNPARM in the RPG code would probably be a good idea here - the CL could just pass the "return" variable as the first parm.

I've done this in the past to aid in debugging situations like this, and with large return values like this one it is also much more efficient.

Jon Paris

On Jun 17, 2021, at 11:08 AM, Charles Wilt <charles.wilt@xxxxxxxxx> wrote:

Since you're returning a value, the value is copied back out of the
procedure via the stack.

Thus, the initialized memory space you saw the x'00' inside the RPG
procedure isn't the same memory space that you're seeing in the CL.

Since you're returning a varchar(), it's not really surprising that only
the actual length contains valid data.

Moral of the story, don't look past the current actual length of a
varchar().

Charles

On Thu, Jun 17, 2021 at 8:56 AM Leo Burkett <lburkett99@xxxxxxxxx> wrote:

I have a CL program calling an RPG procedure. The basics are:

DCL &DISTLIST *CHAR 5352

DCL &GRPID C *CHAR 20

DCL &TOTYPE *CHAR 4

.. assign values to &GRPID and &TOTYPE ..

CALLPRC EMLTO PARM((&GRPID *BYVAL) (&TOTYPE *BYVAL)) RTNVAL(&DISTLIST)

&DISTLIST is defined as varying in the RPG procedure, so its length is data
length + 2.

Using debug, I can see that the value in the RPG procedure at the point of
return is filled with trailing x'00'. In the RPG procedure, I put a
'watch'
on the returned variable, and after the RPG procedure has finished but
before I return to the CL program, I get a message that QUIPUTV has
modified
&DISTLIST. The variable now contains garbage where to x'00' used to be.

I pass &DISTLIST as the 'TO' parameter of the MMAIL command EMLMSG. The
command fails because of an invalid parameter, and never gets to the EMLMSG
cpp.

TIA,

Leo Burkett

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