RE: confused over this prototype definition

["Schmidt, Mihael" <Mihael.Schmidt@xxxxxxxxxxx>]

Probably the callee uses the same copybook. This way he can use the same
DS on the PI for the procedure parameters.

Regards

Mihael 

-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of David FOXWELL
Sent: Tuesday, January 12, 2010 10:56 AM
To: RPG programming on the IBM i / System i
Subject: confused over this prototype definition

Hi,

I don't fully understand the two DS declarations that follow this
prototype definition. The prototype is in the module source, ie, with
all the rest of the code. The caller uses compiler directives to copy in
only the code shown below. Why does the module compile when MyProcIn and
MyProcOut are declared twice each? Why does the caller need the
declarations that follow the prototype?

Thanks.


D MyProc          PR              N                         
D MyProcIn...                                               
D                                     LIKEDS (MyProcInDs)   
D                                     CONST                 
D MyProcOut...                                              
D                                     LIKEDS (MyProcOutDs)  
                                                            
 *  Input parms.                                                  
D MyProcInDs...                                             
D                 DS                  BASED (template)      
D                                     QUALIFIED

D  Parm1                              LIKE ( xxxxx )

D  Parm2                              LIKE ( xxxxx )        
                                                            
 *  Output parms.                                                 
D MyProcOutDs...                                            
D                 DS                  BASED (template)      
D                                     QUALIFIED             
                                                            
D  Parm1                         1                          
                                                            
                                                            
 *  Definition parameters for callers.                      
D MyProcIn...                                               
D                 DS                  LIKEDS (MyProcInDs)   
D MyProcOut...                                              
D                 DS                  LIKEDS (MyProcOutDs)