topic Re: Connecting wires to build array through VI Scripting in LabVIEW

Connecting wires to build array through VI Scripting

HB. — Fri, 20 Feb 2015 17:12:43 GMT

Hi,

I have been looking for a way to connect wires to a "build array" node through VI Scripting.

I have an array of inputs which have to translate into an array via "build array" node. I successfully added input terminals to "build array" node through VI Scripting. However, the program fails when I try to run a loop to wire all the inputs sequentially. The problem is, all of the input wires at the first element of "build array". Snapshot of code is attached.

Please suggest me a way to connect different elements at different inputs of "build array" node.

Thank you.

Regards

Re: Connecting wires to build array through VI Scripting

Darin.K — Fri, 20 Feb 2015 17:41:03 GMT

You should be iterating over the terminals of the Build Array node and calling the Connect Wire method of each terminal.

Re: Connecting wires to build array through VI Scripting

HB. — Fri, 20 Feb 2015 17:46:03 GMT

Thanks for the reply. This is the same I am doing as shown in the snap shot. Please point out where I am missing something.

Regards

Hasan

Re: Connecting wires to build array through VI Scripting

Darin.K — Fri, 20 Feb 2015 17:56:22 GMT

You are calling Connect Wires on the node itself, not on the individual terminals. You need to use the Terminals[] property of the node to get the array of terminals (element 0 is the output terminal).

Re: Connecting wires to build array through VI Scripting

HB. — Fri, 20 Feb 2015 18:15:36 GMT

I am still unable to solve it. It is still connecting the terminals to the 1st element of "build array" node. Please see the edited code and point out the mistake in it.

Thanks

Re: Connecting wires to build array through VI Scripting

Darin.K — Fri, 20 Feb 2015 18:37:43 GMT

You'd have to post the code, not the screenshot. Are you sure it is wiring to the first element? Wiring in scripting can be tricky, have you tried doing a BD cleanup on the scripted code? Often wires overlap or run in strange places.

Re: Connecting wires to build array through VI Scripting

RavensFan — Fri, 20 Feb 2015 20:56:40 GMT

I'd recommend looking at JKI's Right Click Framework. One of the plugins it has that I've used in the past is Build Array of References. At the heart of it will be a subVI for building the array. It looks like it uses a method for the Terminal object called "Create Described Wire".

Digging into that could give you the main part of the code that you need for what you are trying to do.

Re: Connecting wires to build array through VI Scripting

HB. — Sat, 21 Feb 2015 09:39:49 GMT

Hi Darin,

Sorry for the inconvenience. I posted screen shot because it is a long VI including many other sub VIs in it. Anyways, I have made the new VI containing only that piece of code where I am having problem.

This VI generates another VI (in stack sequence 0) and creates two numeric control knobs in the new VI (in stack sequence 1). I then want to build an array of these control knobs (in stack sequence 2). I am unable to wire them in different terminals of "build array" node. The 0th stack sequence (nested inside the outer 2nd stack) adds the appropriate number of terminals in "build array" node. The 1st stack sequence (nested inside the outer 2nd stack) is the one where I am doing unknown mistake.

Thanks for your due help.

Regards

Re: Connecting wires to build array through VI Scripting

HB. — Sat, 21 Feb 2015 09:44:04 GMT

Hi Raven,

Thanks for your reply.

I have already been through it and following his logic , but still unable to achieve my desired goal. It must be very small logical mistake which I am committing. Please see the attached file in the above comment Problem_HB.vi

Thanks

Regards

Hasan

Re: Connecting wires to build array through VI Scripting

Darin.K — Sat, 21 Feb 2015 16:21:59 GMT

Running LV12 at the moment, faster to write a quick example than to open LV14 and look at your VI.

Re: Connecting wires to build array through VI Scripting

tst — Sat, 21 Feb 2015 17:30:35 GMT

You would probably see your problem if you ran the VI in highlight execution or single stepping mode and then you'll see that you have at least two bugs - the minor one is that you're assuming that the array of terminals is parallel to the array of control refs, but it's not, because the first terminal is the output one. The fastest way to resolve this is probably to only increment your counter inside the false case.

The more major is that you're reading the number of terminals on the node before you're resizing it, so that your loop only runs two times.

Re: Connecting wires to build array through VI Scripting

HB. — Sun, 22 Feb 2015 22:23:58 GMT

Hi Darin,

Thanks a lot. It worked with your block diagram except that I had to pass the reference through "terminal" property node to define the source of wire. LV2012 version attached!

Thanks again.

Regards
HB

Re: Connecting wires to build array through VI Scripting

HB. — Sun, 22 Feb 2015 22:25:55 GMT

Thanks tst,

I got your point and it helped me solving the problem. 🙂

Regards