Get reserved/unreserved status of device programmatically

[AlexDarsigny]

Hi,

I have a very simple question. How can I know if a device is reserved or not. For instance, I see that cDAQ9189-1FB2D01 is actually reserved since "Unreserve Network Device" button is enabled.

I already know how to reserve/unreserve in my vi but I just can't find a feedback to confirm. I need this to periodically check if my cDAQ is still reserved and if not, display to the user that cDAQ is not reserved anymore.

Thanks!

[BertMcMahan]

I don't have a handy network device I can use to test this, but I'd think you can either 1- try to reserve the device programmatically and check for an error, or 2- try to start a task on the device and check for an error.

See this thread for some more ideas/info.

[AlexDarsigny]

The first solution is definitely not viable since I don't want my application to steal device reservation from another PC periodically. Solution 2 might work. Is there a way to create a dummy task related to cDAQ rack, not the cards?

Thanks.

[BertMcMahan]

There's a "Force reservation?" input on that VI. If it's set to False, it won't steal it from another machine. (According to the docs)

[AlexDarsigny]

Yes that's also an option. Even if a device is unreserved, I'd still have to reserve it in order to know if it's not reserved though. I guess I'll have to find the list of devices configured in NI-MAX, find cDAQ rack and its cards and try to create a task on one of them to finally know if the device is already reserved.

[BertMcMahan]

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@AlexDarsigny wrote:

Yes that's also an option. Even if a device is unreserved, I'd still have to reserve it in order to know if it's not reserved though. I guess I'll have to find the list of devices configured in NI-MAX, find cDAQ rack and its cards and try to create a task on one of them to finally know if the device is already reserved.

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What do you actually "need" to know? From your first post it sounded like you just needed to see if it was reserved so that it could *become* reserved. Is there something else you need to know about it?

[AlexDarsigny]

I'm only looking for a status : reserved or unreserved. In my vi, I would constantly call a sub-vi to refresh this status.