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  • Glenn Wants To Know More Facts About Special Values

    November 28, 2012 Hey, Ted

    I found your article 10 Facts You Should Know about Special Values very interesting. I have a few questions related to a command I am writing.

    –Glenn

    I owe Glenn an apology. He is one of the many people whose email I never responded to. I’m sorry, Glenn. Sometimes life presents too many opportunities.

    Here’s Glenn’s first question:

    1. If a user specifies *ALL for a parameter, how do you prevent the user from typing in other values?

    Fair enough. Define *ALL in the Single Value (SNGVAL) keyword, not in the Special Value (SPCVAL) keyword.

    CMD        PROMPT('Do it')
    
    PARM KWD(RPTTYPE) TYPE(*DEC) LEN(1) RSTD(*YES) +
         DFT(*ALL) +
         SPCVAL((*CVNPRB 1) (*LIBSUM 2) (*LIBDTL 3) +
                (*OBJSUM 4) (*OBJDTL 5)) +
         SNGVAL((*ALL 0)) +
         MIN(0) MAX(5) +
         PROMPT('Type of report')
    

    Now you can run commands like these:

    DOIT RPTTYPE(*ALL)
    DOIT RPTTYPE(*LIBSUM *OBJSUM)
    DOIT RPTTYPE(*CVNPRB *LIBSUM *LIBDTL *OBJSUM *OBJDTL)
    

    But do this. . .

    DOIT RPTTYPE(*ALL *LIBSUM)
    

    . . .and you’ll get error CPD0094 (*ALL must be only value for parameter RPTTYPE).

    Now, Glenn’s second question:

    2. Can you prevent a user from keying in the same value more than once?

    No. Nothing will stop you from doing this:

    DOIT RPTTYPE(*LIBSUM *LIBSUM *LIBSUM *LIBSUM *LIBSUM)
    

    The system allows you to enter up to five values in the RPTTYPE parameter. If you want to waste a spot by duplicating a value, the system won’t object. It is up to the command-processing program to recognize and ignore duplicates.

    Glenn had two more questions, both of which deal with mixed lists. That will have to be a topic for another day.

    –Ted

    RELATED STORY

    10 Facts You Should Know about Special Values



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Volume 12, Number 28 -- November 28, 2012
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  • Glenn Wants To Know More Facts About Special Values
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