Yes, it's still in Lucid. This is a subtle, nasty bug which needs to be
fixed, or else a run-time exception raised to prevent silent data loss.
Basically, this problem makes the Array(...) constructor useless, i.e.,
too dangerous to use, unless you know and control all calling contexts
to prevent mixing of String and Variant arrays.
** Description changed:
Binary package hint: openoffice.org
- In oo Basic, if an array is declared to have String elements, and is
subsequently assigned to an array of Variant,
- then ReDim Preserve fails to preserve elements which should be preserved.
+ In oo Basic, if an array is declared to have String elements, and is
+ subsequently is the LHS of an assignement from an array of Variant, then
+ a subsequent "ReDim Preserve" of the LHS array destroys the entire
+ contents of the array, i.e., the 'Preserve' does not work.
- EXAMPLE: The following code displays a(0)='w' before the ReDim
- Preserve, but a(0)='' afterwards
+ Please see the attached demo file. Here is the Basic code from that
+ file:
- sub test
- dim a() as String
-
- 'a = Array("w", "x", "y", "z")
- dim b(0 to 3) as Variant
- b(0) = "w"
- b(1) = "x"
- b(2) = "y"
- b(3) = "z"
- a = b
-
- MsgBox("BEFORE ReDim, LB=" & LBound(a) & " UB=" & UBound(a) & " a(0)='" &
a(0) & "'")
- ReDim Preserve a(LBound(a) to UBound(a))
- MsgBox("AFTER ReDim, LB=" & LBound(a) & " UB=" & UBound(a) & " a(0)='" &
a(0) & "'")
- end sub
+ dim thecopy() as String
+
+ 'Oringal code in the app was: thecopy = Array("w", "x", "y", "z")
+ dim TEMP(0 to 3) as Variant
+ TEMP(0) = "www"
+ TEMP(1) = "xxx"
+ TEMP(2) = "yyy"
+ TEMP(3) = "zzz"
+ thecopy = TEMP
+
+ MsgBox("BEFORE supposedly-no-op ReDim, thecopy[0]=" & thecopy(0))
+ ReDim Preserve thecopy(LBound(thecopy) to UBound(thecopy))
+ MsgBox("AFTER, thecopy[0]=" & thecopy(0))
+
+ (shows that thecopy[0] has been set to empty despite the 'Preserve')
ProblemType: Bug
Architecture: amd64
Date: Wed Nov 4 13:45:44 2009
DistroRelease: Ubuntu 9.10
ExecutablePath: /usr/lib/openoffice/program/soffice.bin
Package: openoffice.org-core 1:3.1.1-5ubuntu1 [modified:
var/lib/openoffice/basis3.1/program/services.rdb]
ProcEnviron:
- PATH=(custom, user)
- LANG=en_US.UTF-8
- SHELL=/bin/bash
+ PATH=(custom, user)
+ LANG=en_US.UTF-8
+ SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-14.48-generic
SourcePackage: openoffice.org
Uname: Linux 2.6.31-14-generic x86_64
** Tags added: apport-collected
** Description changed:
Binary package hint: openoffice.org
In oo Basic, if an array is declared to have String elements, and is
subsequently is the LHS of an assignement from an array of Variant, then
a subsequent "ReDim Preserve" of the LHS array destroys the entire
contents of the array, i.e., the 'Preserve' does not work.
Please see the attached demo file. Here is the Basic code from that
file:
dim thecopy() as String
'Oringal code in the app was: thecopy = Array("w", "x", "y", "z")
dim TEMP(0 to 3) as Variant
TEMP(0) = "www"
TEMP(1) = "xxx"
TEMP(2) = "yyy"
TEMP(3) = "zzz"
thecopy = TEMP
MsgBox("BEFORE supposedly-no-op ReDim, thecopy[0]=" & thecopy(0))
ReDim Preserve thecopy(LBound(thecopy) to UBound(thecopy))
MsgBox("AFTER, thecopy[0]=" & thecopy(0))
(shows that thecopy[0] has been set to empty despite the 'Preserve')
ProblemType: Bug
Architecture: amd64
Date: Wed Nov 4 13:45:44 2009
DistroRelease: Ubuntu 9.10
ExecutablePath: /usr/lib/openoffice/program/soffice.bin
Package: openoffice.org-core 1:3.1.1-5ubuntu1 [modified:
var/lib/openoffice/basis3.1/program/services.rdb]
ProcEnviron:
PATH=(custom, user)
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-14.48-generic
SourcePackage: openoffice.org
Uname: Linux 2.6.31-14-generic x86_64
+
+
+ ---
+ Architecture: amd64
+ DistroRelease: Ubuntu 10.04
+ InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100429)
+ Package: openoffice.org-calc 1:3.2.0-7ubuntu4
+ PackageArchitecture: amd64
+ ProcEnviron:
+ PATH=(custom, user)
+ LANG=en_US.UTF-8
+ SHELL=/bin/bash
+ ProcVersionSignature: Ubuntu 2.6.32-22.33-generic 2.6.32.11+drm33.2
+ Tags: lucid
+ Uname: Linux 2.6.32-22-generic x86_64
+ UserGroups: adm admin audio cdrom dialout dip fax floppy fuse games lpadmin
netdev plugdev sambashare tape users vboxusers video
--
Assigning Variant to String array causes ReDim Preserve to not work
https://bugs.launchpad.net/bugs/474777
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