COMBO runtime error

[nenad cikic]

I have this window with template generated combo from a file.

Queue:FileDropCombo  QUEUE                            !Queue declaration for browse/combo box using ?lBlagajna
blag:opis              LIKE(blag:opis)                !List box control field - type derived from field
blag:sifra             LIKE(blag:sifra)               !Primary key field - type derived from field
Mark                   BYTE                           !Entry's marked status
ViewPosition           STRING(1024)                   !Entry's view position
                     END
FDCB2::View:FileDropCombo VIEW(blagajnicko_mjesto)
                       PROJECT(blag:opis)
                       PROJECT(blag:sifra)
                     END
Window               WINDOW('Prijava'),AT(,,165,101),FONT('Tahoma',,,,CHARSET:EASTEUROPE),CENTER,IMM,SYSTEM,GRAY,DOUBLE
                       PROMPT('korisnik:'),AT(7,13,59,10),USE(?korisnik:Prompt)
                       ENTRY(@s20),AT(70,12,89,12),USE(korisnik),LEFT(2),MSG('korisnik'),TIP('korisnik')
                       PROMPT('zaporka:'),AT(7,34,59,10),USE(?zaporka:Prompt)
                       ENTRY(@s20),AT(70,33,89,12),USE(zaporka),LEFT(2),MSG('zaporka'),TIP('zaporka'),PASSWORD
                       STRING('blagajna:'),AT(7,51,101,10),USE(?String1)
                       COMBO(@s100),AT(7,67,154,14),USE(lBlagajna),IMM,FORMAT('400L(2)|M~opis~@s100@'),DROP(5),FROM(Queue:FileDropCombo)
                       BUTTON('&Prihvati'),AT(17,84,70,14),USE(?OkButton),LEFT,ICON('tick.png'),DEFAULT
                       BUTTON('&Odustani'),AT(91,84,70,14),USE(?CancelButton),LEFT,ICON('cross.png'),STD(STD:Close)
                     END

The combo behaves strangely:
-if i click on the combo arrow i see records, but when i choose the combo blinks and then resets to empty string
-if i enter manually the string with keyboard and then choose with the arrow i get crash indicating NullpointerException CWin line 532
c.setProperty(Prop.SELSTART,start);

I have tried different workarounds but withou luck.

Do you use COMBO?
Nenad

[Andrew Barnham]

Hi, yes my app uses combos.  I do not use ABC templates to populate them although, I typically hand roll them.  Combos should work in c2j, but their implementation is not as comprehensive as other window controls.  Many things that work in LIST are not implemented in c2j for COMBO.

In code snippet above I cannot see the variable definition for lBlagajna.  I assume it looks something like this:
lBlagajna string(100)

c2j is sensitive to use variables not being implemented; so based on code I can see above I think this may be the a possible cause of problems.

[nenad cikic]

I have noticed that when i uncheck "Automatic Entry Field Completion", then the runtime error vanishes. It's still not working good as now i can not select the value: i select a row and the use var returns to blank.

[nenad cikic]

I have managed to find a workaround. I have used temporary variable to sotre the selection value and then after parent.takenewselection i return the value

ThisWindow.TakeNewSelection PROCEDURE

ReturnValue          BYTE,AUTO

Looped BYTE
  CODE
  LOOP                                                     ! This method receives all NewSelection events
    IF Looped
      RETURN Level:Notify
    ELSE
      Looped = 1
    END
    CASE FIELD()
    OF ?lBlagajna
      get(Queue:FileDropCombo,choice(?lBlagajna))
      lBlagajna=Queue:FileDropCombo.blag:opis
      lBlagajna2=lBlagajna
    END
  ReturnValue = PARENT.TakeNewSelection()
    CASE FIELD()
    OF ?lBlagajna
      lBlagajna=lBlagajna2

[nenad cikic]

What you mean by "variables not being implemented"?