[AccessD] Form corruption?

[Janet Erbach]

Garbage collectors, eh?  Then why didn't they come for this app the moment
it hit the floor??  :)

None of the objects I'm drawing are bound to anything in this test - just
rectangles with labels.  And I just got as high as 30,159.  But it doesn't
really matter;  I can still make my point that this is an unstable approach.

On Mon, Mar 9, 2015 at 11:34 AM, John W. Colby <jwcolby at gmail.com> wrote:

> Thanks for doing that Janet.
>
> I suspect that this has to do with instances of DAO recordsets.  I have
> never tested controls per se but I did once test DAO recordsets and came up
> with that same number.  I would bet that if you tested with non data aware
> controls you would find entirely (and larger) numbers.  Things like labels
> and lines etc.
>
> I am guessing that there is some sort of garbage collection process that
> is scavenging the dao pointers, which allows the different numbers you are
> seeing.
>
> John W. Colby
>
>
> On 3/9/2015 11:29 AM, Janet Erbach wrote:
>
>> And I am doing that very test right now.  With interesting results, too -
>> inconsistent ones.
>>
>> 1)  When I run the test to draw objects on the form one right after
>> another, Access consistently chokes at object 1040.
>>
>> 2)  After I delete those 1040 objects and start drawing again, Access will
>> add another 1040 - a total of 2080 having been drawn to the form in all -
>> before it chokes.
>>
>> 3)  If I draw in 'batches' - add 500, delete 500, add 500 more - I can
>> keep
>> going for a long time.  (This is with saving the form, closing it down,
>> and
>> re-opening it after each batch.)  I got up to a total count 20,000 some
>> objects that had been drawn to the form over it's 'life time' before
>> access
>> gave up.
>>
>> 4)  I started playing with drawing objects in different batch sizes.  I
>> just now ran a few batches of 500, then ran one of 2,000, then upped it to
>> 5,000 .  Access choked  after drawing a total of 6120 objects.
>>
>> So it seems that Access is inconsistent in it's response to how many
>> objects have been drawn, deleted, and re-drawn on the form over the course
>> of it's lifetime.  Which is the ammo I need to bring to my boss when I
>> tell
>> him the whole form handling routine has to be re-written.
>>
>> Janet
>>
>>
>>
>>
>>
>> On Tue, Mar 3, 2015 at 6:38 PM, John W. Colby <jwcolby at gmail.com> wrote:
>>
>>  It sounds like it's time for Janet to do a test!
>>>
>>> ;)
>>>
>>> John W. Colby
>>>
>>> On 3/3/2015 7:35 PM, Jim Dettman wrote:
>>>
>>>  The number given has always been 754,  but that has drifted upwards to
>>>> over 1,000 in later versions.   I posted all the counts a few years
>>>> back.
>>>>
>>>> Jim
>>>>
>>>> Sent from my iPhone
>>>>
>>>>   On Mar 3, 2015, at 6:45 PM, Charlotte Foust <
>>>> charlotte.foust at gmail.com>
>>>>
>>>>> wrote:
>>>>>
>>>>> It used to be in the documentation, but I haven't looked it up recently
>>>>> because it became moot after they introduced tab controls.
>>>>>
>>>>> Charlotte
>>>>>
>>>>>
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>>>
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