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However, care must be taken if the original code uses dynamic references to the lower bound of the array because the upgraded array will have more elements than the original. In each of these examples, the upgraded declarations will compile and run. LongArray, which originally had a starting index of 15, now starts at index 0 resulting in 15 additional array elements in the upgraded array. For example, StringArray, which was declared with a starting index of 1, now begins at index 0 and has only one extra element. The impact is that the number of elements in the upgraded arrays is increased by a number equivalent to the original starting index. Thus, the upgraded StringArray and LongArray declarations have been modified so that only the ending index is kept.
#VISUAL BASIC ARRAY UPGRADE#
The upgrade wizard removes the lower index from the declaration, leaving only the ending index. The same will be true for any array in the original code that did not specify a starting index the upgraded versions will all begin at index 0 and end at the original ending index.įor array declarations that specify an index range in which a positive lower index is specified, a similar change is made. The impact of the change in array bounds is that VariantArray now has six elements, indexed from 0 to 5. This UPGRADE_WARNING is added for each array declaration that does not specify a lower bound. ' UPGRADE_WARNING: Lower bound of array VariantArray was ' changed from 1 to 0. The actual comments would remain the same as in the original Visual Basic 6.0 code.Įach of the issues will be examined in turn.įor code that uses Option Base 1, the upgrade wizard will issue the following UPGRADE_WARNING message. Note: The comments in the preceding upgraded code have been altered to reflect the changes in the number of elements each array contains after the upgrade. ' UPGRADE_ISSUE: Declaration type not supported: Array with lower ' bound less than zero.ĭim IntArray(-10 To 10) As Short 'Invalid array declaration Dim LongArray(25) As Integer '26 elements ' UPGRADE_WARNING: Lower bound of array LongArray was changed from 15 to 0. Dim StringArray(100) As String '101 elements ' UPGRADE_WARNING: Lower bound of array StringArray was changed from 1 to 0. ' Specify the array index range in the array declaration. Dim VariantArray(5) As Object '6 elements (0-5)
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' UPGRADE_WARNING: Lower bound of array VariantArray was changed from 1 to 0. The following code example shows the result of applying the upgrade wizard to the example declarations in the preceding example. Furthermore, some declarations may be changed and others left unchanged depending on the starting index in the original code. Applying the upgrade wizard to code with such declarations will result in UPGRADE_WARNING comments inserted in the upgraded code wherever the declarations appear. Thus, code in which array declarations have a non-zero starting index must be adjusted. All array declarations must have a starting index of 0. None of the preceding declarations are supported in Visual Basic. Dim StringArray(1 To 100) As String '100 elements Dim LongArray(15 To 25) As Long '11 elementsĭim IntArray(-10 To 10) As Integer '21 elements Option Base 1ĭim VariantArray(5) As Variant '5 elements (1-5) As a result, the Option Base 1 declaration is not supported, nor is specifying an array index range.Ĭonsider the following Visual Basic 6.0 array declarations. NET, all arrays have a starting index of 0. The Visual Basic Upgrade Wizard can convert code that uses control arrays into Visual Basic 2008 code that uses more recent structures.In Visual Basic 6.0, you can specify the starting index for arrays using the Option Base declaration or by specifying the index range in the array declaration.
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not using control arrays), you only have to write one procedure for each array.Ĭontrol arrays are no longer supported in Visual Basic 2008, as "changes to the event model" made them unnecessary. Hence, instead of writing individual procedures for each control (i.e. All of the events available to the single control are still available to the array of controls, the only difference being an argument indicating the index of the selected array element is passed to the event. Ĭontrol arrays are a convenient way to handle groups of controls that perform a similar function. One application of control arrays is to hold menu items, as the shared event handler can be used for code common to all of the menu items in the control array. Control arrays are always single-dimensional arrays, and controls can be added or deleted from control arrays at runtime. In Visual Basic, a control array is a group of related controls in a Visual Basic form that share the same event handlers.