RE: RE: Passing parameter back to calling CL -- C400-L

Here is an example I wrote just now:

/* C source */
#include <string.h>              
                                 
int main(int argc, char * argv[])
{                                
  int x = 3;                     
  memcpy(argv[1],&x,sizeof(x));  
}                                

/* CL source */
PGM                             
                                
dcl &var1 *char 4               
dcl &var1char *char 11          
                                
call elvis/clptest parm(&var1)  
chgvar &var1char %bin(&var1 1 4)
                                
sndpgmmsg &var1char             
                                
ENDPGM      


This will print to the screen:   00000000003

Your critical line of code would be:

memcpy(argv[2],&riofb_fwd->rrn,sizeof(riofb_fwd->rrn));

You can also convert binary to char in C program to make it easier for CL to
handle it by doing something like this instead of memcpy:

sprintf(argv[2],"%d",riofb_fwd->rrn);

This will convert binary to char string, but it will null terminate it,
which is unfriendly to CL.  To put space back in the CL buffer you could
follow sprintf with:

argv[2][strlen(argv[2])] = ' ';

Now your CL buffer is just characters and you don't have to use %BIN in your
cl program to deal with it.

Many ways to skin a cat.

Oh, btw, welcome to C programming.

Elvis

-----Original Message-----
From: c400-l-bounces@xxxxxxxxxxxx [mailto:c400-l-bounces@xxxxxxxxxxxx] On
Behalf Of David C. Shea
Sent: Friday, October 01, 2004 2:06 PM
To: C programming iSeries / AS400
Subject: RE: [C400-L] RE: Passing parameter back to calling CL

Elvis:

We're getting warmer...  Your *argv[3] approach allows the C program to
compile.  Now, I'm getting a decimal data error when trying to CHGVAR
the returned parameter back to the CL variable...

When I look at the dump, I see:

&RRN9              *DEC               15 0        '        '
1E0000000000000F    

What should the format of the passed variable from the CL be?

So... here's what I'm doing.

.
.
.
            DCL        VAR(&FULLNAME ) TYPE(*CHAR) LEN(40)     
            DCL        VAR(&RRN9) TYPE(*DEC) LEN(15 0)         
.
.
            CALL       PGM(ARCPGM/RCLDSPYC) PARM(&FULLNAME &RRN9)      
            CHGVAR     VAR(&RRN ) VALUE(&RRN9)               

In the C program:

.
.
int main(int argc, char * argv[])          
.
.
*argv[2] = riofb_fwd->rrn;                 
.
.

I'm guessing that I need to convert a field format someplace...

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-----Original Message-----
From: c400-l-bounces@xxxxxxxxxxxx [mailto:c400-l-bounces@xxxxxxxxxxxx]
On Behalf Of Elvis Budimlic
Sent: Friday, October 01, 2004 2:07 PM
To: 'C programming iSeries / AS400'
Subject: RE: [C400-L] RE: Passing parameter back to calling CL

You should be able to set values in a C program as long as CL program
passes
in the variable.  You simply need to dereference the argv parameter and
set
it, i.e.:

*argv[3] = rrn;

Elvis

-----Original Message-----
From: c400-l-bounces@xxxxxxxxxxxx [mailto:c400-l-bounces@xxxxxxxxxxxx]
On
Behalf Of Chris Wolcott
Sent: Friday, October 01, 2004 12:29 PM
To: c400-l@xxxxxxxxxxxx
Subject: RE: [C400-L] RE: Passing parameter back to calling CL

My Bad.  The way I showed you was if you were calling an exported
procedure.  (From a *MODULE or *SRVPGM)  I rarely CALL a program
anymore.

- = - = - = - = - 

When creating a new CL, use CLLE for your Source Type.  You may have to
compile your CL as a *MODULE (use opt 15) and then use CRTPGM to create
the final program.  

Define the two variables as below, and use the CALLPRC command instead
of the CALL command to run your C code.  (You can prompt it if needed.)

The odd thing is you have to use the %BIN function twice.  When used in
the RTNVAL option, it tells the compiler that you will be getting back
an integer.  Since CL has no INT type, it is stored as a 4 byte
character field.  (Hence the defintion of &wrkINT as *CHAR 4)  The
CHGVAR use of %BIN actually changes the value to a packed format. 

DCL VAR(&wrkINT    ) TYPE(*CHAR) LEN(     4)
DCL VAR(&RRN       ) TYPE(*DEC ) LEN(  15 0)

CALLPRC PRC(program) PARM(parm1 parm2 . . . parmX)
   RTNVAL(%BIN(&wrkINT))
CHGVAR  VAR(&RRN) VALUE(%BIN(&wrkINT)) 

- = - = - = - = -

RTVJOBATR can give you a return code from a CALLed program, but the help
says just COBOL, RPG, DFU and sorts.  I've never used it.  

-----Original Message-----
subject: RE: 

Do you have or do you know where I can find an example of this approach?
I'm not familiar with CLLE,so if I could see a sample, I could clone
it...


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