CVErr Function Example

This example uses the CVErr function to return a Variant whose VarType is vbError (10). The user-defined function CalculateDouble returns an error if the argument passed to it isn't a number. You can use CVErr to return user-defined errors from user-defined procedures or to defer handling of a run-time error. Use the IsError function to test if the value represents an error.

' Call CalculateDouble with an error-producing argument.
Sub Test()
    Debug.Print CalculateDouble("345.45robert")
End Sub
' Define CalculateDouble Function procedure.
Function CalculateDouble(Number)
    If IsNumeric(Number) Then
        CalculateDouble = Number * 2    ' Return result.
    Else
        CalculateDouble = CVErr(2001)    ' Return a user-defined error 
    End If    ' number.
End Function