How Do I set up a LabView ActiveX server?

Are there any documenation or sample program which is about how to setup a LabView ActiveX server? my C++ program will dynamically call VI and then pass the integer to Labview program via ActiveX and then perform some control of digital oscillscope. Do anyone help me? thanks for help so much......It is in hurry......please help..............
CowCow

From the NI knowledge base...
Problem: How do I enable LabVIEW as an ActiveX Server?
Solution: Under Edit >> Preferences >> Server: Configuration, select ActiveX as a protocol and enable all server resources. Under Edit >> Preferences >> Server: Exported VIs, list the name of all VIs that can be accessed remotely. You can include the full path to the VI, or just list its name. Wildcard characters are valid. You can explicitly deny access to certain VIs by clicking the Deny Access button. Note that changes to the Server will not take effect until LabVIEW is relaunched.

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Calling LabView ActiveX Server from TCL?

Does anyone have experience calling a LabView ActiveX server vi from
TCL? I created a simple VI with one control (labeled "A") and one
indicator (labeled "B") and a +1 adder between them. I can load and
open the VI from TCL:
package require tcom
set lv [::tcom::ref createobject "LabView.Application"]
set viPath "D:\\National Instruments\\LabView\\Activity\\a.vi"
set vi [$lv GetVIReference $viPath]
$vi FPWinOpen True
But when I try to send in data:
$vi -namedarg Call A 1
I get the error message "unknown parameter A".
I have also attempted to duplicate the "ActiveX Server" example
from the LabView help file, calling "Frequency Response.vi". This
approach encounters the same error message:
% package require t
com
3.0
% set lv [::tcom::ref createobject "LabView.Application"]
::tcom::handle0x013202F4
% set viPath "D:\\National
Instruments\\LabView\\examples\\apps\\freqresp.llb\\frequency
Response.vi"
D:\National Instruments\LabView\examples\apps\freqresp.llb\frequency
Response.vi
% set vi [$lv GetVIReference $viPath]
::tcom::handle0x01335AE8
% $vi FPWinOpen True
% $vi -namedarg Call Amplitude 10
unknown parameter Amplitude
If anyone can point me in the right direction, or give me an
example of how to do this I would greatly appreciate it.
TIA.
Leslie

In article ,
Leslie Brooks wrote:
>"Bruce Hartweg" wrote in message
>news:...
>> "Chin Huang" wrote in message
>news:[email protected]...
>> >
>> > I don't use LabView, but from the Visual Basic example I saw, it seems
>> > the Call method takes two arguments. The first is an array of parameter
>> > names and the second is an array of parameter values. Try to send in
>> > data with the Tcl command
>> >
>> > $vi Call [list A] [list 1]
>>
>> I'm unable to help the original question (don't know LAbView or VB stuff) but
>> just want to point out that [list A] is equal to A and [list 1] is the
>same as 1.
>>
>> Bruce
>
> I know what is supposed to be passed to the 'Call' method. Doing
>this:
>
>set inst [::tcom::info interface $vi]
>$inst methods
>
> produces (among other things):
>
>{1015 VOID Call {{{in out} {VARIANT *} paramNames} {{in out} {VARIANT
>*} paramVals}}}
>
> So the 'Call' method is expecting two parameters, both pointers
>to variants. TCOM appears to be passing the correct parameter type
>because the TCOM documentation says that a TCL List maps to a
>one-dimensional array of VT_VARIANT. However, the results are
>INvariant (bad pun intended):
>
>% $vi -namedarg Call Amplitude 10
>unknown parameter Amplitude
>% $vi -namedarg Call [list Amplitude] [list 10]
>unknown parameter Amplitude
>% $vi -namedarg Call [list Amplitude] [list [::tcom::na]]
>unknown parameter Amplitude
>% set i 5
>5
>% $vi -namedarg Call [list Amplitude] {incr i}
>unknown parameter Amplitude
>% $vi -namedarg Call [list Amplitude] [list [incr i]]
>unknown parameter Amplitude
>% $vi -namedarg Call Amplitude [incr i]
>unknown parameter Amplitude
>
> Who can help me with this? Who is the LabView Guru?
Try invoking the Call method without the -namedarg option. The
-namedarg option doesn't work the way you seem to think it works. The
-namedarg option provides a way to specify arguments named from the
method's parameter specification. For example, you discovered that the
Call method take two parameters named "paramNames" and "paramVals".
Tcom returns the error "unknown parameter Amplitude" because "Amplitude"
doesn't match either parameter name.

Getting clusters from LabVIEW ActiveX Server with Excel/VBA

Hello,
my colleague and I are trying to control a LV from Excel (VBA) by ActiveX.
I.E.:
We do something like :
Set LV = createObject("LabVIEW.Application")
Set VI = LV.GetVIReference("Path_to_VI")
ParamNames(0) = "Input1"
ParamNames(1) = "Input2"
ParamNames(2) = "Output"
ParamValues(0) = 1
ParamValues(1) = 3.1415
Call VI.Call(ParamNames,ParamValues)
msgbox("output =" & ParamVals(2))
This works perfectly for simple data types (int, double, float, string, etc )
Now we need to transfer more complex structures, which are originaly LV-clusters.
But we did not find any clue on how do that (especially receive clusters) in the help or on the internet.
Is there any chance to succeed ???
TIA,
Thomas

Actually, working with clusters is really really easy. Through the magic of - well something - a cluster in LV comes out in the VBA environment as an array of variants. There was an activex example that shipped with V7.1 that showed this very thing. I couldn't find them in V8 so here is the 7.1 stuff.
Check out the macros in the Excel spreadsheet... This show running the VI in the development environment, but if this looks interesting I can fill you in on how to make it work in an executable.
Mike...
Certified Professional Instructor
Certified LabVIEW Architect
LabVIEW Champion
"... after all, He's not a tame lion..."
Be thinking ahead and mark your dance card for NI Week 2015 now: TS 6139 - Object Oriented First Steps
Attachments:
freqresp.xls ‏49 KB
Frequency Response.llb ‏155 KB

Starting applications remotely using LabView activeX server

I want to
make a program that enables me to start applications on a remote computer. I
made a program that starts applications using either System exec.vi or .NET and
both methods work find on my local computer. I built it with activeX server
enabled and copied it to my remote computer. After struggling with DCOM
settings and Security settings for a couple of days!! I’m now able to start the
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Manager, I can see both the programs under the Process tab so they have
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Does anyone
have an idea on how to start the programs as applications?

Why not just use PsExec?
http://technet.microsoft.com/en-us/sysinternals/bb897553.aspx

Labview ActiveX Server PATH if in development environment

I'm using Labview 2010 to build an ActiveX server. I can access the executable as an activeX sever from both C and LabVIEW clients. No problems there. But now I want to do some debugging in the development environment while accessing the program via an ActiveX client. In such a situation, how do I change how I access the VI's in the project? I tried using the lvproj in place of the EXE, but this was insufficient. Seems a little convoluted with the changes required to do this debugging.

I think that I already have my answer in that I can not generate a LV event through an ActiveX interface regardless of the type of control, but if you want to play with it, here is a Demo which I derived from the previous link given above. Within the attached ZIP file, read the "Readme.txt" file for instructions. Specifically the program assumes that is located in C:\tmp, since LabVIEW doesn't like relative pathes in both the build and reference node paths, (so they are coded with absolute pathes). If you use C:\tmp, the instruction in Readme.txt should work.
What happens is that you click on the button in the ActiveX Client running in the LV development space.
You can see the control value change shade/color in the ActiveX Server EXE application,
but because no event is generated, the Event Handler does nothing.
I know that I can poll the value of the control and then use the Value (Sgnl) property control to generate an event, but this isn't a very clean solution.
All code in the ZIP file is LabVIEW 2010 release1
Attachments:
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Labview activex server registration incomplete.

I made an ActiveX server using LabVIEW. The server should communicate with Excel. During installation of the server I register the server: "Server.exe /RegServer". When I try to call the server from Excel/VBA, it responds with "Run-time error '429': ActiveX component can't create object". The server is only recognized by Excel after I have started and stopped the server once.
When investigating the registry, it appears that the difference between registering with /RegServer and just starting and stopping the server are the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\ServerName.Application
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\ServerName.Application.6
To my opinion the /RegServer commandline option does not do the whole job.
Also /UnRegServer does not remove the above mentioned registry keys.
Is this a bug or just normal behaviour?
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Hi,
I've tried to call a with LabVIEW 7.1.1 created activeX server. This works without any errors. I've attached my code.
As for the register keys, this seems to be the default behaviour of ActiveX, each server has a key without version number e.g.
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\ServerName.Application
And one or more with a version number:
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\ServerName.Application.6
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\ServerName.Application.7 Kind regards,
Karsten
Applications Engineer
National InstrumentsMessage Edited by KvZ on 07-27-2005 02:37 PM
Attachments:
ActiveX Server.zip ‏45 KB

How to pass VI ref. from LV ActiveX server to LV executable?

Greetings all,
The question is: How can I pass a VI Server VI Ref from a vi that is dynamically called using LV ActiveX?
The method I'm trying to use is the "CALL2" method. The target vi executes fine, parameters are set and read fine using the paramNames and paramVals inputs/outputs of the invoke node, however this doesn't work on one of my outputs which is a VI Reference. Probing the reference wire after it is converted back yields "Refnum No Longer Valid" along with the hex value of the refnum.
Why I need to do this: I'm building a highly modular application that consists of a core application and several "plugins." All are developed in LabVIEW 8.2. The core application is an .exe file, the plugins are .dll's and can be updated on site without a full recompile of the app, and the user can also pick and choose the plugins they wish to install. In this sense it works a lot like the Firefox web browser. Idealy, others should be able to develop plugins. In order for them to be able to test and debug their plugins while launching them from the core, the core application needs to be able to run uncompiled VI's as plugins. This can be accomplished one of two ways that I know of. Either through the use of a VI Server, or by instantiating LV through ActiveX and using the ax properties and methods to run the vi. When a plugin is started, it spawns a thread that allows it to communicate with other plugins and monitors it's UI, then returns a reference to the plugin main VI so that the core application can display it in a sub panel. The goal is to not use the VI Server method which would cause the uncompiled VI to attempt to execute under the Core app's instance of the run time engine, but to execute it using the LV Dev. Environment through ActiveX so the developer can pause, probe etc their plugin vi.
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Core is compiled and plugins are compiled
Core is not compiled, plugins are compiled
Core is not compiled, plugins are not compiled
What's missing is the way the core should be deployed to potential plugin developers:
Core is compiled, plugins are not compiled.
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Just an update, I've bumped this up to NI tech support and they are looking into it...

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How do I set the PXI 6031E for single ended or differential input?

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Are you using traditional daq or DAQmx??
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Message Edited by devchander on 03-08-2006 10:30 PM
Attachments:
mode.vi ‏23 KB

How Do I set up a LabView ActiveX server?

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