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Tip of the Day
Language: VB4,VB5,VB6,VBS
Expertise: beginner
Apr 20, 1999

IsNullString - Check whether a string contains white-spaces

' Return True is a string is made only of spaces, tabs, and Null characters.
' This function is especially useful to test whether fixed-length strings 
' are initialized.

Function IsNullString(Text As String) As Boolean
    Dim i As Long
    For i = 1 To Len(Text)
        Select Case Asc(Mid$(Text, i, 1))
            Case 0, 9, 32
            Case Else
                Exit Function
        End Select
    Next
    IsNullString = True
End Function
Francesco Balena
 
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