CU Amiga Super CD-ROM 2/CU Amiga Magazine's Super CD-ROM 02 (1996)(EMAP Images)(GB)[!][issue 1996-04].iso/magazine/amiga_e/amigae.jan.archive/000056_crash!plucky.i…b.af.mil!bwills_Mon, 24 Jan 94 00:48:35 PST.msg

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Date: Sun, 23 Jan 94 10:22:58 CST
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From: [e-mail] (Barry D Wills)
To:
Subject: re: lvlist

-> OK, I've tried this in my code....
->
->      SELECT gadgetid
->      CASE ADDLIST
->        AddTail(lvlist,[0,0,0,0,'!x!']:ln)
->        Gt_SetGadgetAttrsA(clicked,win,NIL,[GTLV_LABELS,$FFFFFFFF])
->        Gt_SetGadgetAttrsA(clicked,win,NIL,[GTLV_LABELS,lvlist])
->      ENDSELECT

Aren't the AddTail() line and first Gt_Set..A() lines in
reverse order?  Also, Kenny, you need to have a 0 as the
last tag in your taglist:  [GTLV_LABELS,$FFFFFFFF,0] or
[GTLV_LABELS,$FFFFFFFF,TAG_DONE] (TAG_DONE is from
utilities/taglist.m).

-> What I want to happen is: when I click on my "Add" button, the string '!x!'
-> (just for testing, don't worry!) to appear at the bottom of the list. But
-> clicking on the button for the first time results in nothing, whilst
-> clicking it again causes the process to hang....
-> I guess LISTVIEW's aren't my thing ... :)

Also, you DON'T want to use static variables in dynamic
structures, such as this listview, unless you're sure
what's going on.  If that AddTail() is in any kind of
a loop, or a function that's called two or more times,
your setting yourself up by linking that static memory
to itself.

To demonstrate what I mean, compile and run this:

PROC fun()
  DEF f:PTR TO LONG
  f:=[1,2,3]
  WriteF('f@\d=[\d,\d,\d]\n', f, f[0], f[1], f[2])
ENDPROC f

PROC main()
  DEF x:PTR TO LONG
  x:=fun()
  x[0]:=9; x[1]:=8; x[2]:=7
  fun()
ENDPROC

Calling fun() puts the address of the static list
containing [1,2,3] into x in main().  Then the contents
of the list are changed in main() (huh!!!), so the next
time you call fun() you don't see what you might expect.

This is your brain:  __________________________
This is your brain on E:  !!!!!!!!!!!!!!!!!!!!!*
Any questions?

-- Barry
From crash!Ra.MsState.Edu!djm2 Mon, 24 Jan 94 00:48:50 PST
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Date: Sun, 23 Jan 1994 12:28:41 -0600 (CST)
In-Reply-To: <[e-mail]> from "Barry D Wills" at Jan 22, 94 10:15:15 am
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From: Daniel Jr Murrell <[e-mail]>
To: [e-mail]
Subject: Re: UnsubscribEEs

Barry,
  How do I get off this list!? :)  I've tried several times, but the
listserver just will not take me off. :(

Dan