Re: [BLACKBOX] user input (was limiting integer values in interactor field)

From: [at]} <Gunnar>
Date: Sun, 17 Jan 2010 11:15:43 +0100

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Robert,

> [...]
> My point is that since 'self' is a (*copy*) of the pointer to the Action
> record setting it to NIL has no effect; the main pointer also needs to be
> cleared.
>
> [...]
> What (I think) you need to do to free the memory it is put the line
> attActionObj := NIL
> at the end of
> PROCEDURE attNotifier*( n, op, from, to: INTEGER ).
You are correct that I should reset the global variable (and have
noticed the difference).

>
> Do you have a reason to export "attActionObj" ?
Not really, in fact it works fine without.
But I have been using the SqlDb a lot recently, so exporting records
for accessibilities sake has almost become second nature.

>
> If not, I think its is better to move the declaration
> VAR
> attActionObj : attNotifierAction;
> into
> PROCEDURE attNotifier*( n, op, from, to: INTEGER ).
>
> Then there is no need to write
> "attActionObj := NIL" at the end
> as the garbage collector will free the memory anyway.
There is a global pointer to the notifier data in order to flush the
last event for another input field. This can not be done if the pointer
is only local to attNotifier (the comparison attActionObj.n#n would make
no sense).

regards
gunnar


PS: I do not know how professional programmers work, but when I return
from work I am happy to understand a basic concept and making it run.
The majority of my errors are fixed by the first idea that springs to
mind and is accepted by the compiler and a superficial test at run time
(when I see how our programmers at work fix errors I assume this is what
they do as well most of the time).

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Received on Sun Jan 17 2010 - 11:15:43 UTC