[Gambas-user] Can one test for a null object?

[Robert Rowe]

Have you tried:

IF Null?(frmClinical.currentProject.past_history) THEN
    x = frmClinical.currentProject.past_history.count
ELSE
    x = 0
ENDIF

You could also use TRY

    x = 0
    TRY x = frmClinical.currentProject.past_history.count
    IF ERROR then
       'Do whatever you want if an error occurs
    ENDIF

Robert Rowe

richard terry wrote:
> When I load a patients past history into my program I want to be able to get 
> the total count to do something, but if there is nothing in the 
> currentPatient.past_history collection, this line bombs:
>
>  x = frmClinical.currentPatient.past_history.count 
>
> and says 'null object'
>
> I has various attempts to test this first, with no luck.
>
> Any help appreciated.
>
> Richard T
>
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