RE: Service Program using a C module

The EXPORT on these lines is the problem.

D BCDPacked S 18P 0 EXPORT
D BCDChar S 10 EXPORT

Without the EXPORT, the variables would be global to a particular module. With
EXPORT, they are
global to the entire service program. Thus, you can't have them defined in
more than one place.

One option:
Use EXPORT on the definitions in one module and IMPORT on all the others.

It looks like the C module may be using the EXPORTED variables for input; since
the procedures only
have one parameter and don't return any values.

WHY??? This is not a very good way to do this. Can you change the C
procedures to "properly" handle
input/output?

I'd do something like so:

//PCS_Format Include file
DToBCD PR like(t_BCDPacked)
D charInput const like(t_BCDChar)

DFromBCD PR like(t_BCDChar)
D numInput const like(t_BCDPacked)

D t_BCDPacked S 18P 0 based(TEMPLATE)
D t_BCDChar S 10 based(TEMPLATE)


Then to use, simply copy in the include file:
/Copy *LIBL/QCPYSRC,PCS_Format (contains prototypes just as above)

Define some variables for yourself:
D myBCDPacked like(t_BCDPacked)
D myBCDChar like(t_BCDChar)

And use them when calling the C procedures:
C EVAL myBCDPacked = FromBCD(myBCDChar)


If you can't change the C procedures, I'd strongly recommend wrapping the C
procedures in RPG IV
procedures which have "proper" inerfaces. Holler if you need help doing so.


Charles

-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of
mgarton@xxxxxxxxxxxxxxx
Sent: Thursday, June 07, 2007 10:17 AM
To: rpg400-l@xxxxxxxxxxxx
Subject: Service Program using a C module




I have a program that format messages. Currently the
formatting process is all in one program that uses a C
module. Since the formatting can be used by other processes,
I want to make a formatting service program with a
module for each message type. The C module would be used
within all the
modules. I am getting multiple definition errors when trying
to create the service program. Below is how the C module is
described/used in the existing program.

DToBCD PR
D 18P 0
DFromBCD PR
D 10
D BCDPacked S 18P 0 EXPORT
D BCDChar S 10 EXPORT

C CALLP ToBCD(BCDPacked)

Here is how the service program modules look:

/Copy *LIBL/QCPYSRC,PCS_Format (contains prototypes just as above)

D BCDPacked s 18P 0 Export
D BCDChar s 10 Export

P FMT0100 B Export

D FMT0100 PI 256A
D InputVar 264A Const


C CALLP ToBCD(BCDPacked)

P E

This is my first attempt at creating a service program from
scratch. How
should the variables BCDPacked and BCDChar be described?
The above works
when I have the one module but when I start adding other
modules I get a multiple definition error when I try to
create service program. So that means that the variables are
global when described as above? Is there a better way to do this?

Thanks.


Mark Garton
Information Systems
O'Reilly Auto Parts

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