Re: Reading Data Area

[Scott Klement <rpg400-l@xxxxxxxxxxxxxxxx>]

Sigh...  RPG/400 is an extremely limited language.  That's why IBM 
hasn't developed feaures for it in 15 years.  That's why just about 
everyone frowns on it's use... it's an extremely limited language.

It does not support *LGL data areas.  Here's a quote from the RPG/400 
User's Guide:

   "An RPG/400 program does not support data areas defined by the
    CL command CRTDTAARA in which *LGL is specified as the TYPE
    parameter."

So, truly, what you're planning is not possible with RPG/400 (at least, 
not without calling an API).  It's beyond the capabilities of RPG/400. 
It might be worth noting, although this doesn't really help you, that 
when you use a data structure as the result of an IN operation, the data 
 area MUST be *CHAR.   However, if you used a numeric field (just the 
field, not in a data structure) you could potentially read a *DEC data 
area from RPG/400.  But *LGL isn't possible.

ILE RPG/400, by contrast, has no problem with *LGL data areas:

      d MyLglVar       s              1N   dtaara(TESTLGL)

      c     *lock         in        MyLglVar

Likewise, CL has no problem with them

      RTVDTAARA DTAARA(TESTLGL) RTVVAR(&MYLGLVAR)

If you want to stay with the OPM environment, your best bet is to write 
a CL program to retrieve the contents of your *LGL variable, and call 
that CL program from your RPG/400.

Sorry.

Coyle, Stephen F. wrote:
> Hi All...I'm having a problem trying to read a logical data area in
> RPG400.
>
> Data Area Definition:
> Data area . . . . . . . :   P57832LOCK                         
>   Library . . . . . . . :     DVMODD                           
> Type  . . . . . . . . . :   *LGL                               
> Length  . . . . . . . . :   1                                  
> Text  . . . . . . . . . :   Toggle Access to P57832 & P57833   
> Value . . . . . . . . . :   0                                  
>
> RPG code:
> ILOCKDS      DS                              1      
> I                                        1   1 LOCK
> I**CKDS      DS                                   
> I**                                      1   1 LOCK
> I**CKDS      DS                                       
> I**                                      1   10LOCK   
> C           *NAMVAR   DEFN P57832LOCKLOCKDS           
> C                     IN   LOCKDS                     
> C           LOCK      IFEQ '1'    
> C**         LOCK      IFEQ 1                                            
> C                     MOVE DENY      MSGTXT    P      
> C                     CALL 'P57530'                   
> C                     PARM 1         ENDOPT           
> C                     PARM           MSGTXT           
> C                     MOVE *ON       *INLR            
> C                     RETRN                           
> C                     ENDIF                           
>
> Error Message:
> The P57833 193500 data area P57832LOCK type or length does not match 
>   program data area (C G S D F).                                     
>
> I get this error whether the data structure is defined as character or
> numeric. Can a *LGL type data area be read into an RPG400 program?
> It worked fine in RPGIV but I was able to define the field to read into
> as an indicator.
>
> Any help appreciated...Thanks in advance...
>
> - Steve