When digital recorders are automatically deleted?

Hi people,

I have a strange behavior with data value references in LV OOP:

I would like to equip a class with a reference to data value. When the first instance of this class is created, I create a new given reference value and a semaphore and put it in the cluster of private class data.

Like this, after I created a new agency data in both cases should be the same (i.e. the dvr the same part of the memory addresses) and to avoid problems of access to the data, the semaphore is used, to ensure that instances do not, interfere when accessing data.

After some time access vi survey error number 1 on the semaphore and the error number 1556 on the reference. It seems that the reference and the semaphore is released.

Ist it some garbage man, who destroyed the references automatically after the vi constructor has finished, although there are always a class that stores the reference?

Thanks in advance

Edit: If I read that data value references immediately after that I called the class constructor and if I put a probe on the semaphore, I get the "invalid" reference as a value, even if the address of memory has not changed. Strange!

mthimm1 wrote:

Ist it some garbage man, who destroyed the references automatically after the vi constructor has finished, although there are always a class that stores the reference?

Yes there is! All refnums LabVIEW are garbage collected from the VI Tope level in the hierarchy was created the refnum goes inactive. So if you have an initialization VI which is started as highest level VI and that creates your DVR and the semaphore and initialize VI is started dynamically (whose actors are as far as I know) and then he finished his task Merry and inactivity, the refnum is destroyed and your other players no longer see an object invalid refnum.

It is therefore important to create these refnums inside the hierarchy who will use them or you can also have a VI of high level that remains active for the duration of the executation of the entire program and to delegate the creation of these refnums than VI or some Subvi which takes place in this hierarchy.

Tags: NI Software

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