Question regarding passing variables to ILE-RPG from C

[Peter Grace <pgrace@xxxxxxxx>]

Hello!

I've been fiddling with C, modules, bound service programs, etc, and 
have come to a situation where I need the expertise of someone a bit 
more knowledgeable.

Given the following C Source:

0001.00 #include <stdio.h>
0002.00 #include <string.h>
0003.00 #include <stdlib.h>
0004.00
0005.00 char* getStr(int incomingVar);
0006.00
0007.00 char* getStr(int incomingVar)
0008.00 {
0009.00  char foo[25];
0010.00  sprintf(foo,"%d",incomingVar);
0011.00  return foo;
0012.00 }

And given the following ILE RPG Source:

0001.00 D getStr          PR            25A   extproc('getStr')
0002.00 D                                5I 0 VALUE
0003.00 C                   MOVEL     *BLANKS       FOOSTR           25
0004.00 C                   Eval      FOOSTR = getStr(1)
0005.00 C                   Eval      *INLR = *ON


(I've compiled the C source as a module, then created a service program 
using crtsrvpgm -- kudos to IBM for having an example of how to write a 
QSRVSRC file!)

I was expecting when I ran the rpg program, named USESTR, that FOOSTR 
would equal something akin to '1                 ' -- that is, the 
visual depiction of 1 and 24 other spaces.  I was greeted instead by 
gibberish.

I think that this has something to do with the pointer that I'm creating 
doesn't exist outside of the service program?  Is this correct, or am I 
just making a big goof?

What is the "Right Way" for me to return a char* array (or even a data 
structure) via a bound-C service program to a RPG program?  Is there 
even a right way to do it?

Any help would be appreciated!


Peter Grace