How do I make an integer to null in Excel VBA?
Question
I am trying to detect whether an integer was set, and if not, skip most of the code in the loop (using an if statement). Here is what I have so for.
Do While hws.Cells(r, 9).Value <> ""
On Error Resume Next
ar = Null
ar = aws.Range("A:A").Find(hws.Cells(r, 2).Value).Row
If Not IsNull(ar) Then
'work with ar'
End If
r = r + 1
Loop
However, when I run it, ar = Null
has problems. It says "Invalid use of null".
Solution
Find returns a range:
Dim rf As Range
With aws.Range("A:A")
Set rf = .Find(hws.Cells(r, 2).Value)
If Not rf Is Nothing Then
Debug.Print "Found : " & rf.Address
End If
End With
-- http://msdn.microsoft.com/en-us/library/aa195730(office.11).aspx
OTHER TIPS
Variables defined as Integer cannot be Null in VBA. You will have to find another way to do what you want. eg use a different data type or use a magic number to indicate null (eg -1).
In your example code, either ar will be assigned a Long value (Range.Row is a Long) or it will throw an error.
just use a variant and isempty:
Dim i
If IsEmpty(i) Then MsgBox "IsEmpty"
i = 10
If IsEmpty(i) Then
MsgBox "IsEmpty"
Else
MsgBox "not Empty"
End If
i = Empty
If IsEmpty(i) Then MsgBox "IsEmpty"
'a kind of Nullable behaviour you only can get with a variant
'do you have integer?
Dim j as Integer
j = 0
If j = 0 Then MsgBox "j is 0"
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