Re: Managing multiple &FIELDS in a screen using CL -- MIDRANGE-L

Hi Peter,

The CL language is not well suited for this sort of thing, since it doesn't have arrays. I think it's important to remember that what you are writing is source code -- under the covers, the data is not really accessed by a variable name. That's just done in source code to make it easier for the programmer. In reality, data is located in your computer's storage, and accessed by a storage address. So calculating a variable name at runtime in an expression doesn't make a lot of sense -- there is no variable name at run time.

What you can do, however, is force all of the data to be in a contiguous space in member, and access it by calculating the memory position. This could either be done with pointers, or perhaps it's simpler to use substrings.

For example, you could do this:

DCL VAR(&MEMBER) TYPE(*CHAR) LEN(10)
DCL VAR(&ALLMBR) TYPE(*CHAR) LEN(600)
DCLF FILE(YOUR-DSPF)

SNDRCVF

Now that you've got the &MEMBER01, &MEMBER02, etc variables filled in and given to your program, you can do something like this (this is where it starts to get awkward)

CHGVAR VAR(&ALLMBR) +
VALUE(&MEMBER01 *CAT &MEMBER02 *CAT &MEMBER03 +
*CAT &MEMBER04 *CAT &MEMBER05 *CAT &MEMBER06 +
*CAT &MEMBER07 *CAT &MEMBER08 *CAT &MEMBER09 +
*CAT &MEMBER10 *CAT &MEMBER11 *CAT &MEMBER12 +
*CAT &MEMBER13 *CAT &MEMBER14 *CAT &MEMBER15 +
*CAT &MEMBER16 *CAT &MEMBER17 *CAT &MEMBER18 +
*CAT &MEMBER19 *CAT &MEMBER20 *CAT &MEMBER21 +
*CAT &MEMBER22 *CAT &MEMBER23 *CAT &MEMBER24 +
*CAT &MEMBER25 *CAT &MEMBER26 *CAT &MEMBER27 +
*CAT &MEMBER28 *CAT &MEMBER29 *CAT &MEMBER30 +
*CAT &MEMBER31 *CAT &MEMBER32 *CAT &MEMBER33 +
*CAT &MEMBER34 *CAT &MEMBER35 *CAT &MEMBER36 +
*CAT &MEMBER37 *CAT &MEMBER38 *CAT &MEMBER39 +
*CAT &MEMBER40 *CAT &MEMBER41 *CAT &MEMBER42 +
*CAT &MEMBER43 *CAT &MEMBER44 *CAT &MEMBER45 +
*CAT &MEMBER46 *CAT &MEMBER47 *CAT &MEMBER48 +
*CAT &MEMBER49 *CAT &MEMBER50 *CAT &MEMBER51 +
*CAT &MEMBER52 *CAT &MEMBER53 *CAT &MEMBER54 +
*CAT &MEMBER55 *CAT &MEMBER56 *CAT &MEMBER57 +
*CAT &MEMBER58 *CAT &MEMBER59 *CAT &MEMBER60 )

This is necessary because there's no guarantee that the display file will put these fields in consecutive memory. Concatenating them all into a single string will, however, guarantee that the data is consecutive.

Now that you have all your members in a single LEN(600) variable you can loop through them like this:

CHGVAR VAR(&MEMBER_FLG) VALUE('0')
DOFOR VAR(&POS) FROM(1) TO(591) BY(10)
CHGVAR VAR(&MEMBER) VALUE(%SST(&ALLMBR &POS 10))
IF (&MEMBER *NE ' ') DO
CHGVAR VAR(&MEMBER_FLG) VALUE('1')
ENDDO
ENDDO

This is untested, so I might've made a syntax mistake.. but it should be very close to being right.

Hopefully you get the idea.

On 1/4/2013 8:32 AM, Vidal, Peter wrote:

GM list!

I have seen this issue explained before but I do not know how to describe it better than giving you an example about it.

I have 60 fields on a single screen. All of the fields start with the prefix "MEMBER" and they have a numeric suffix between 01 and 60. I want to use a DOFOR to check all of them and turn on a flag whenever I find one of these fields with some content in it. I would like to do something like this:

DCL VAR(&COUNTER) TYPE(*INT) LEN(2)
DCL VAR(&CNTR) TYPE(*CHAR) LEN(2)
DCL VAR(&MEMBER) TYPE(*CHAR) STG(*AUTO) LEN(10)
DCL VAR(&MEMBER_FLG) TYPE(*LGL) STG(*AUTO) LEN(1)
.
.
.

CHGVAR VAR(&MEMBER_FLG) VALUE('0')
DOFOR VAR(&COUNTER) FROM(1) TO(60) BY(1)
CHGVAR VAR(&CNTR) VALUE(&COUNTER)
CHGVAR VAR(&MEMBER) VALUE('MEMBER' || &CNTR)
IF COND(&MEMBER *NE ' ') THEN(DO)
CHGVAR VAR(&MEMBER_FLG) VALUE('1')
ENDDO
ENDDO

Obviously this will not work, but is the idea of what I am trying to accomplish. Same thing if I have 60 indicators (from 01 to 60) on this display and I would like to turn them all off without doing:
CHGVAR VAR(&IN01) VALUE('0')
CHGVAR VAR(&IN02) VALUE('0')
CHGVAR VAR(&IN03) VALUE('0')
Etc., etc., etc. ...

Thank you for your advices in advance!
Peter Vidal

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