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Visual Basic for Applications Reference

Visual Studio 6.0

This array is fixed or temporarily locked (Error 10)

See Also    Specifics

Not all arrays can be redimensioned. Even arrays specifically declared to be dynamic and arrays within Variant variables are sometimes locked temporarily. This error has the following causes and solutions:

  • You tried to use ReDim to change the number of elements of a fixed-size array . For example, in the following code, the fixed array FixedArr is received by SomeArr in the NextOne procedure, and then an attempt is made to resize SomeArr:
    Sub FirstOne
        Dim FixedArr(25) As Integer    ' Create a fixed-size array and
        NextOne FixedArr()    ' pass it to another procedure.
    End Sub
    
    Sub NextOne(SomeArr() As Integer)
        ReDim SomeArr(35)        ' Error 10 occurs here.
        . . .
    End Sub
    

    Make the original array dynamic rather than fixed by declaring it with ReDim (if the array is declared within a procedure), or by declaring it without specifying the number of elements (if the array is declared at module level).

  • You tried to redimension a module-level dynamic array, in which one element has been passed as an argument to a procedure. For example, in the following code, ModArray is a dynamic, module-level array whose forty-fifth element is being passed by reference to the Test procedure:
    Dim ModArray () As Integer    ' Create a module-level dynamic array.
        . . .
    
    Sub AliasError()
        ReDim ModArray (1 To 73) As Integer
        Test ModArray (45)    ' Pass an element of the module-level 
                                    ' array to the Test procedure.
    End Sub
    
    Sub Test(SomeInt As Integer)
        ReDim ModArray (1 To 40) As Integer  ' Error occurs here.
    End Sub
    

    There is no need to pass an element of the module-level array in this case, since it's visible within all procedures in the module. However, if an element is passed, the array is locked to prevent a deallocation of memory for the reference parameter within the procedure, causing unpredictable behavior when the procedure returns.

  • You attempted to assign a value to a Variant variable containing an array, but the Variant is currently locked. For example, if your code uses a For Each...Next loop to iterate over a variant containing an array, the array is locked on entry into the loop, and then released at the termination of the loop:
    SomeArray = Array(9,8,7,6,5,4,3,2,1)
    
    For Each X In SomeArray
        SomeArray = 301    ' Causes error since array is locked.
    Next X
    

    Use a For...Next rather than a For Each...Next loop to iterate. When an array is the object of a For Each...Next loop, you can read the array, but not write to it.

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