[Bug 33239] New: VisualBasic arrays of User Defined Type (UDTs) with strings

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=33239

             Bug #: 33239
           Summary: VisualBasic arrays of User Defined Type (UDTs) with
                    strings
           Product: Wine
           Version: unspecified
          Platform: x86
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
        AssignedTo: wine-bugs at winehq.org
        ReportedBy: mod at navsoft.com
    Classification: Unclassified


Created attachment 43964
  --> http://bugs.winehq.org/attachment.cgi?id=43964
Uses a simple program to test where the crash occurs

I use arrays of UDTs which work under MS Windows. (Any version post Win 2000
except ME.) The program also works happily on a Mac using a Parallels virtual
machine.

These fail under WINE if one or more of the fields is a string. The "TYPE"
order makes no difference.

UDTs which contain only numbers are not affected.

Failure occurs on any attempt to "ReDim" or "Erase" the array. The problem does
not occur when the strings are fixed length or for flat UDTs containing strings
of undeclared length. Prior to a crash, the content of the UDTs can be read and
written to.

Trying to write a simple program produces strange results. I tried initially on
an old PC and found that it would crash simply by redimming the arrays but when
installed under Parallels, it will handle simple arrays and only crashes as I
start to get more adventurous; i.e. using a UDT type declared in a DLL but
otherwise identical.

My main program can be downloaded at http://navsoft.com/AstroNav_Setup.exe. It
makes no claims to being compatible with WINE but there are references to the
problem area elsewhere in this forum by Users who would like to run it under
WINE.

AstroNav uses UDTs extensively. The problem is the Almanac screen where multi
dimension UDTs are widely used. With AstroNav, simply declaring and then
destroying the arrays will cause a crash. [There is also a problem with WINE's
treatment of SetGraphicsMode which I have not yet pinned down but will
hopefully circumvent very shortly. (The SetGraphicsMode API does not work quite
as Microsoft claim so removing it, is probably desirable.)]

The attached backtrace was caused by the following code. The crash occurs only
for Command4_Click() and only on the third press. (Rapid pressing will cause a
"The array is temporarily locked" error/ crash.)


FORM CODE
==========
Private Type My_UDT
    n1              As Long
    s1              As String
    s2              As String
End Type

Private mUDT()      As My_UDT
Private DLL_UDT()   As Main_Almanac_Columns

Private Sub Command1_Click()        ' NO PROBLEM NOW BUT SIMILAR CODE CAUSED A
    Dim i As Long                   ' CRASH ON AN OLDER PC
    ReDim mUDT(99)

    For i = 0 To 99
        mUDT(i).s1 = "Some String"
        mUDT(i).s2 = "Some String"
    Next i

    ReDim mUDT(99)
End Sub

Private Sub Command2_Click()            ' SAME AS ABOVE BUT USING A GLOBAL UDT
    Dim i As Long                       ' = A BIT MORE ADVENTUROUS
    ReDim gUDT(99)

    For i = 0 To 99
        gUDT(i).s1 = "Some String"
        gUDT(i).s2 = "Some String"
    Next i

    ReDim gUDT(99)
End Sub

Private Sub Command3_Click()            ' MORE ADVENTUROUS; PASSING DATA USING
    Compile_Data                        ' Public Property Get
    gUDT = My_Module_UDT
End Sub

Private Sub Command4_Click()            ' CRASHES ON THE THIRD CLICK ON MY MAIN
    Alt_Compile_Data                    ' MACHINE
    DLL_UDT = My_DLL_UDT
End Sub

MODULE CODE
===========
Private DLL_UDT()         As Main_Almanac_Columns

Type Module_UDT
    n1       As Long
    s1       As String
    s2       As String
End Type

Private mUDT()          As Module_UDT
Public gUDT()           As Module_UDT


'\\ THE MODULE LEVEL TEST

Sub Compile_Data()
    Dim i As Long

    ReDim mUDT(71)

    For i = 0 To 71
        With mUDT(i)
            .n1 = i
            .s1 = i
            .s2 = i
        End With
    Next i
End Sub

Public Property Get My_Module_UDT() As Module_UDT()
    My_Module_UDT = mUDT
End Property

'\\ USING THE IDENTICAL TYPE DECLARED IN A MODULE
Sub Alt_Compile_Data()
    Dim i As Long

    ReDim DLL_UDT(71)

    For i = 0 To 71
        With DLL_UDT(i)
            .Gap = i
            .sGHA = i
            .sDec = i
        End With
    Next i
End Sub

Public Property Get My_DLL_UDT() As Main_Almanac_Columns()
    My_DLL_UDT = DLL_UDT
End Property

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