XControl without timeout

[LarsM]

Hello!

I need to design an xcontrol that is NOT inside a loop. But the xcontrol is dependent on values from other controls outside of it. So when I run my instrument, the xcontrol event structure will immediately time out and the control will stop running, and no values will be read. Now I'm wondering:

What are the consequences for using an xcontrol without time out event? Is there some smart work-around for having it not time out in that particular case?

Regards

[altenbach]

The X-control itself needs a timeout case as documented in the diagram comments when you desinge the facade VI.

In the calling program, the x-control can be anywhere, but all rules of dataflow obviously apply.

Overall, your question (as written) makes very little sense. Can you attach a simple example that shows what you are trying to do?

What is the function of the x-control?

How exactly does it depend on other controls? (value, properties)

An x-control is always ready to run, even if the calling VI is in edit mode (dumb example).

[Ben]

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@O.P. wrote:

Hello!

I need to design an xcontrol that is NOT inside a loop. But the xcontrol is dependent on values from other controls outside of it. So when I run my instrument, the xcontrol event structure will immediately time out and the control will stop running, and no values will be read. Now I'm wondering:

What are the consequences for using an xcontrol without time out event? Is there some smart work-around for having it not time out in that particular case?

Regards

---

If I  remeber correctly, the Xcontrol will hang if there is no timeout.

I think I read Ton suggesting using the Init of the XControl to create a background thread that does your looping for you.

Add custom properties to define those "other controls" the background thread will monitor.

That is all of the suggestions I can offer.

Ben

[LarsM]

Here's a simple example of what I want to do:

The vi to the left takes some input that's packaged in a class and sent to my xcontrol. But when the "Data Change" event triggers, the "Data in" input is empty.

[LarsM]

An update:

The value I send to the xcontrol contains two class objects, each containing a notifier and a queue, and an integer. If I put a breakpoint inside the xcontrol I can see that the integer contrains a value, but notifiers and queues have invalid refnums, as if they weren't initialized (they should be).

[LarsM]

I tried setting up a test case, but something strange happened. I tried setting up a control that displays a string, but it never receives the string because it doesn't seem to enter run mode.