ISNOTHING function

Purpose | Determine the current status of a given object variable.
Syntax | oStatus = ISNOTHING(objectvar)
Remarks | ISNOTHING is particularly useful in determining the success or failure of a LET statement. It returns TRUE (-1) if the object variable contains nothing, or FALSE (0) if it contains a valid current reference to an object interface. ISNOTHING is the complement to the ISOBJECT function.
Restrictions | objectvar must be an Interface or IDispatch object variable.
See also | DIM, INTERFACE (Direct), INTERFACE (IDBind), ISOBJECT, LET (with Objects), OBJECT, What is an object, anyway?
Example | DIM oApp AS IAPPDatabase LET oApp = NEW IAPPDatabase IN "DBApp.0" IF ISNOTHING(oApp) OR ERR THEN ' Handle error