Helpo de LibreOffice 25.8
Tests if a Variant contains the special Null value, indicating that the variable does not contain data.
Returns True when an object variable is passed that does not refer to a valid object, such as a newly created object that has not yet been assigned or an object assigned to the Nothing literal.
IsNull (Var)
Boolean
Var: Variablo testota. Ĉi tiu funkcio liveras la valoron True se la Variant enhavas la valoron Null, aŭ False se la Varianto ne enhavas la valoron Null.
Null - Ĉi tiu valoro uziĝas por Variant-datuma subtipo sen valida enhavo.
Sub ExampleIsNull
Dim vVar As Variant
MsgBox IsNull(vVar)
End Sub