Zero-length byte arrays in VB6/VBA

To create a byte array with zero length do this

Dim abData() As Byte
abData = vbNullString	

There is no simple way to redimension a dynamic array that might have a zero length without risking a runtime error. The best you can do is as follows.

Dim abData() As Byte
Dim nLen as Long
' Compute required length in bytes...
nLen = ComputeLength()  ' returns length, possibly zero
If nLen > 0 Then
    ReDim Preserve abData(nLen - 1)
Else
    abData = vbNullString
End If