FIX: EXE Crashes When For...Each Loop Iterates Through Array Returned by Property Get Procedure

ID: Q223113

The information in this article applies to:

Microsoft Visual Basic Learning, Professional, and Enterprise Editions for Windows, version 6.0

SYMPTOMS

When using a For...Each loop to iterate through an array that was returned from a Property Get procedure, you receive the following error message:

The instruction at "0x6610d3b1" referenced memory at "0x00131004". The memory could not be "read".

NOTE: The error occurs when the code is called from an EXE that was compiled to native code, but does not occur when called from an EXE that was compiled to p-code. The error does not occur when you execute the code in the Visual Basic IDE.

RESOLUTION

You can work around the problem using one of the following alternative methods:

Compile the EXE to p-code.

Copy the result of the Property Get procedure to a dynamic array, and then use the dynamic array in the For...Each loop.

STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article.

This bug was corrected in Visual Studio 6.0 Service Pack 3.

For more information about Visual Studio 6.0 Service Packs, please see the following articles in the Microsoft Knowledge Base:

Q194022 INFO: Visual Studio 6.0 Service Packs, What, Where, Why

Q194295 HOWTO: Tell That Visual Studio 6.0 Service Packs Are Installed

MORE INFORMATION

Steps to Reproduce Behavior

Create a new Standard EXE project. Form1 is created by default.

In the code module for Form1, add the following code:


Private sSeasons() As String

Property Get SeasonsProp() As String()
    SeasonsProp = sSeasons
End Property

Private Sub Form_Initialize()
    ReDim sSeasons(3)
    sSeasons(0) = "Spring"
    sSeasons(1) = "Summer"
    sSeasons(2) = "Autumn"
    sSeasons(3) = "Winter"
End Sub

Private Sub Form_Load()
    Dim x As Variant
    Dim fForm1 As Form1

    Set fForm1 = New Form1

    MsgBox "Before arrays"
    For Each x In fForm1.SeasonsProp
       MsgBox "Item: " + x
    Next
End Sub

Compile the EXE and run it.

You should see a message box that displays "Before arrays," and then you will receive the error message described in the SYMPTOMS section of this article.

Select "Compile to P-Code" on the Compile tab of the Project Properties, and then recompile.

-or-

Change the sample Form_Load event to the following:


Private Sub Form_Load()
    Dim x As Variant
    Dim fForm1 As Form1
    Dim sTemp() As String

    Set fForm1 = New Form1
    sTemp = fForm1.SeasonsProp

    MsgBox "Before arrays"
    For Each x In sTemp
       MsgBox "Item: " + x
    Next
End Sub

Additional query words:


Keywords          : kbservicepack kbCompiler kbVBp600bug kbGrpVB kbVS600sp2 kbVS600SP1 kbVS600sp3fix 
Version           : WINDOWS:6.0
Platform          : WINDOWS 
Issue type        : kbbug

Last Reviewed: May 20, 1999