Control LabVIEW from different application

I made an application that generates user requested amount of outputs and also takes parameters and IO controls from the user. It seems to me LabVIEW is a perfect tool for the user to do the screen layout. My question is once the layout is done, can I programmatically open the vi file and associate any of my outputs to the screen objects (for example an edit box or a channel of a graph etc.) and feed those screen objects with my data at run time? In other words, is there any APIs for LabVIEW so that I can go in to a vi file and interrogate its components’ properties and then getting or feeding values to/from those components during run time? Can it generate events when a user clicked on a button etc..?
Thanks in advance
Jian
Solved!
Go to Solution.

If it is just for displaying data in a way that the user can customise, I would reccommend you just stay with what you are familiar with. I mentioned a few posts ago that I know for a fact that you can #include a GUI panel resource into a C++ runtime application.
If you do want to run the viewer in LabVIEW, then unless each user is a skilled LabVIEW developer, you will need to run their uncoded VI through an intermediate or parsing LV application which will act as a bridge. This will need to be written in LabVIEW because a VI is saved in a format native to LabVIEW.
I might be able to make a demo on Monday, but for now an abstract description if anybody else wants a quick crack at it;
You could create an opc server (or another data sharing technique) on your data aquisition application, the LabVIEW bridge application will then be able to pull data in.
The bridge application can dynamically get a list of controls from the user panel, and users will be able to tell the bridge what data to pull from the opc server and where to put it.
There will need to be data sanitising; checking imported data types are suitable for where the user wants to put them.
After finishing any configuration, the bridge app will continue to pull in data changes and drop it into the uncoded User Interface panel using the VI server nodes.
Jian, for now you can read up on LabVIEW introduction courses (link, link), and then search for info on the VI Server
- Cheers, Ed

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> http://sine.ni.com/apps/we/niepd_web_display.DISPLAY_EPD4?>p_guid=B45EACE3E21356A4E034080020E74861&p_node=DZ52051&p_submitted=N&p_rank=&p>_answer=&p_source=External
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I need to call LabVIEW and pass parameters to LabVIEW from C# so that I can use labview as a sort of "driver" to control my signal generator from C#.
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The vi that NI created to demo communicating with C# "seems to be unable to leave run mode". When you call Labview from C#, the front pannel comes up and you cannot select the "stop button": it is grey. The Pause button doesn't stop exectution either. This makes me think that the vi was compiled in a different manner. I am more inclined to believe that teh vi is formated incorrectly rather than the C# code working improperly.
The types of the two parameters, param1 and param2, going into the call statement are "string" and "object" respectively. This is the same as with the NI code, which works fine. It is not an error with an incorrectly sized array parameter; that gives a different error message and I have fixed that problem. So, even though the error message says "type mismatch, I don't think that the input parameters to the Call function are incorrect.
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I have Microsoft Visual C# Express 2008 Edition
I am using Labview version 8.6
In my version of the C# code, in this line: string vipath = @"C:\Program Files\National Instruments\LabVIEW 8.6\builds\Sentry_Test\Sentry.llb\Signal_Generator_Controller_For_Sentry_Testing.vi";
You will have to change the directory to wherever you store the vi.
You will need the "Labview" Library so that the C# line "using Labview" will work. I think it is downloaded by default either by labview or visual studio.
In the C# file that NI created, you must add a fourth parameter '3' in the line vi= lv.GetVIReference(vipath,"",true) as the last parameter. You get a compiler error otherwise. That was a mistake NI made.
Thank you for the help.
--Zach
Attachments:
CallLV_Zachs _Version.zip ‏126 KB
callLV_NI_Version.zip ‏48 KB
Signal_Generator_Controller_For_Sentry_Testing.vi ‏12 KB

Zach,
Unfortunately, I do have more of a knowledge
of how to control objects using ActiveX in LabVIEW and not the other way
around. What ActiveX properties and methods are you using in your code and what are the input parameters that you are trying to pass? You mentioned that you only have two input parameters, but the VI you posted has 3 inputs. My guess would be that if you are indeed seeing a type mismatch, it is trying to pass an data type LabVIEW does not know what to do with. This has been seen when trying to pass strings as Task data types (like the VISA Session).
ColeR
Field Engineer

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