Re: cl question

[Pete Hall <peteh@xxxxxxxxxx>]

At 19:28 10/07/1998 , you wrote:
>i was working on the cl part of my job and came up with a few
>questions. this is my cl pgm so far based on a layout i have, a few
>changes ought to be necessary i think.
>
>PGM PARM(&OBJ &LIB &OK)            
>DCL &OBJ *CHAR 10                  
>DCL &LIB *CHAR 10                  
>DCL &TYPE *CHAR 6                  
>DCL &OK *CHAR 1 'Y'                
>CHKOBJ &LIB/&OBJ &TYPE             
>MONMSG CPF0000 EXEC(CHGVAR &OK 'N')
>ENDPGM                             
>
>anyway, my question is how, how does this cl pgm know
>what &OBJ &LIB &TYPE &OK refer to when this cl pgm has to interact
>with display files and rpg pgms, etc...

You must tell it when you call the program. If you are checking for more than 
one type of object, you need to pass the type as a parameter also:

CALL PGM(MYPGM) PARM('MYOBJ' 'MYLIB' '*FILE' &OK)
or in RPG:

C         CALL    'MYPGM'
C         PARM    'MYOBJ'       OBJNAM  10
C         PARM    'MYLIB'       LIBNAM  10
C         PARM    '*FILE'       OBJTYP   6
C         PARM    'Y'           RTNOK    1

You cannot initialize &OK in your CL program, since it is a parameter (exists 
outside of the program).
Do not check only for CPF0000 on the MONMSG. There are reasons other than 
object non-existence that can cause an escape message to be issued by CHKOBJ. 
Prompt the CHKOBJ command, move the cursor to a blank area of the display and 
press F1. Roll up, and a list of all of the messages that CHKOBJ can issue will 
be displayed. Some of the other messages relate to bad library name and 
insufficient authority to see the object. You can also test for specific 
authority with CHKOBJ, to make sure that you will be able to 
delete/update/rename/etc, and you can have several MONMSG commands after the 
CHKOBJ, each testing for different messages, with different actions or branch 
targets. Use the CPF0000 as the last one, in order to handle unexpected errors, 
and branch to code that will cause the program to die gracefully.

hth
Pete


Pete Hall
peteh@inwave.com 
http://www.inwave.com/~peteh/

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