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Global public variables (defined on Excel worksheet) get reset after a call to ActiveSheet.OLEObjects is made

Posted on 2005-02-25
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Last Modified: 2008-02-01
I came across a bug in Excel. When a call is made to ActiveSheet.OLEObjects, it seems to wipe out (set to initialization values) the global variables. To simulate this behavior I defined tmpStr in Sheet1.
I initialized tmpStr in Activate(), Clicked TradeList button which invokes ReadTradeList_Click() and PopulateTradeInfo(call to OLEObjects is made). After that I hit Update button, btnUpdate_Click() gets executed. But in this routine 'Debug.print tmpStr'  prints blanks. If I comment out calls to OLEObjects, in PopulateTradeInfo, 'Debug.print tmpStr' prints correct value in  btnUpdate_Click().  

Any help to work around this will be very much appreciated. Thanks.

The relevant code is as follows.

Sequence of events is Activate(), ReadTradeList_Click() and then Sub btnUpdate_Click().

Public tmpStr As String

Private Sub Worksheet_Activate()

    Dim rng As Range, cl As Range

    tmpStr = "INITIALIZED"

End Sub

Private Sub ReadTradeList_Click()

    Debug.Print "Here :" & Sheet1.tmpStr

    'The above statement prints "INITIALIZED" as expected

    PopulateTradeInfo

End Sub

Public Sub PopulateTradeInfo()
    Application.Cursor = xlWait    
    Worksheets("ENV").Range("ALL_OUT").Value = ""

    ----
    ----    
    lineNo = 1
    For i = 1 To cnt
        -------
        -------
        Dim j As Integer
        j = 1
        For j = 1 To 5
            ------
            ------
        Next
        Debug.Print "Before :" & Sheet1.tmpStr
        ''The above statement prints "INITIALIZED" as expected
        ' ActiveSheet.OLEObjects.Add is called in the following function AddCombo

        comboboxNm = AddCombo(Worksheets("ENV").Range("OUT").Cells(lineNo, 11))
        Debug.Print "After :" & Sheet1.tmpStr
        'The above statement prints "INITIALIZED" as expected

        ActiveSheet.OLEObjects(comboboxNm).ListFillRange = "ScrapWork!A1:A16"

        ActiveSheet.OLEObjects(comboboxNm).LinkedCell = Worksheets("ENV").Range("OUT").Cells(lineNo, 11).Address

        lineNo = lineNo + 1

    Next i
    Application.Cursor = xlDefault
End Sub

Private Sub btnUpdate_Click()

    Debug.Print "Here :" & Sheet1.tmpStr

    'The above statement prints blanks instead of "INITIALIZED"

    ----------
    ----------

End Sub


Public Function AddCombo(rTarget As Range) As String
With rTarget
AddCombo = ActiveSheet.OLEObjects.Add _
(ClassType:="Forms.ComboBox.1", _
Link:=False, _
DisplayAsIcon:=False, _
Left:=.Left, _
Top:=.Top, _
Width:=.Width, _
Height:=.Height).Name
rTarget.Select
End With

End Function

 

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Question by:anandcha
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4 Comments
 
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Accepted Solution

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Xygxag earned 2000 total points
ID: 13406500
Anandcha -

You shouldn't initialize the variables in the Activate event, as it gets called every time the object receives focus.  Use the Load event instead, or if you MUST use the Activate event, set a module-level variable that can check whether initialization has occurred yet:

If bInitialized = false then
   bInitialized = true
   '  initialize your variables here
EndIf

~~ Mark.    
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