ReDim Preserve to a Multi-Dimensional Array in Visual Basic 6

Question

I\'m using VB6 and I need to do a ReDim Preserve to a Multi-Dimensional Array:

 Dim n, m As Integer
    n = 1
    m = 0
    Dim arrCity() As String
    ReDi         


        

Answer 1

This is more compact and respect the intial first position in array and just use the inital bound to add old value.

Public Sub ReDimPreserve(ByRef arr, ByVal size1 As Long, ByVal size2 As Long)
Dim arr2 As Variant
Dim x As Long, y As Long

'Check if it's an array first
If Not IsArray(arr) Then Exit Sub

'create new array with initial start
ReDim arr2(LBound(arr, 1) To size1, LBound(arr, 2) To size2)

'loop through first
For x = LBound(arr, 1) To UBound(arr, 1)
    For y = LBound(arr, 2) To UBound(arr, 2)
        'if its in range, then append to new array the same way
        arr2(x, y) = arr(x, y)
    Next
Next
'return byref
arr = arr2
End Sub

I call this sub with this line to resize the first dimension

ReDimPreserve arr2, UBound(arr2, 1) + 1, UBound(arr2, 2)

You can add an other test to verify if the initial size is not upper than new array. In my case it's not necessary