Does Labview's ActiveX server throw any events?

I'm trying to use Labview as an ActiveX automation server. It works so far, but I can't figure out a good way to get data back from the VI without polling it. Does Labview throw any ActiveX events that I could catch or is there some other way to receive data? Polling is a rather poor solution, so I figure there must be a better way.

qx3n42j,
I ran the List ActiveX Events shipping example on LabVIEW 6.1 and it returned that there are no events. I also searched through the documentation and found no reference to LabVIEW ActiveX events.
You could implement a DLL that throws an event and call that from your LabVIEW VI.
Randy Hoskin
Applications Engineer
National Instruments
http://www.ni.com/ask

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Hello,
       I have been having difficulty using Labview as an AcvtiveX server. I have reviewed all the postings on this subject and most are either pre Labview 8.2 and thus do not account for the changes made between 8.2 and 8.5 which broke the Activex server functions. I have looked at the recommendations for changing the to code to export (exported vi's in a DLL or Source distribution) and have tried these with no success. The closest example I have found was posted here http://forums.ni.com/ni/board/message?board.id=170&thread.id=283417 the example code they posted does ont work for me and still generates and error 3005.
      What i need is simple. I want to turn my applicaiton into a Vi server.. Expose a vi that acceses elements in the Vi server.. (controls, queues, Globals etc) that are in the Vi server context. I would then like to build a vi .. or dll that calls the 'exposed' vi in the vi server to pass data to or from the vi server. The V test.zip example file in the above indicated post is a pretty good example of this .. it just does not seem to work when i build it in 8.5. Are there any GOOD and 'current' examples of using labview as the ActiveX server (Compiled) and calling exposed vis from an external application Labivew, Visual Basic.. etc?? I am only interested in cases where Labview is the Sever. or both client and server.
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Mike,
       Thank you for your response to my question. The problem is that the example you site does not use the Labview vi as the Server. Excel is actually the vi server and the automation open is using and excel automation object. I am sure that Excel creates proper automation objects .. Labview however does not seem to. So while this example shows how labview can function as a client it is not an example of a compiled Labview Sever being accessed by a 'laview vi'. Possibly I am not looking at the vi that you are thinking of.
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Hi,
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HKEY_LOCAL_MACHINE\SOFTWARE\Classes\ServerName.Application.7 Kind regards,
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National InstrumentsMessage Edited by KvZ on 07-27-2005 02:37 PM
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From the NI knowledge base...
Problem: How do I enable LabVIEW as an ActiveX Server?
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How to implement an ActiveX server in LabVIEW

My task is to implement an ActiveX server in LabVIEW 8.0 that will be called from a data management software (DXE).
The LV server will take care of data acquisition and control.
I have been looking for tutorials and example code at the NI developer zone and elsewhere without any progress. Information is either to general or code is to old (LV 5.1) to give any help.
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rolfk wrote:
skalis wrote:
Thank You. Good to know that I am on the right track.
However,
Your sentence "If You look at the several shipping examples..." make me
little concerned. I am not able to find any example of a LV ActiveX
server in my LV 8.0 installation. I would be very grateful of You can
send me any.
Basically you can not create your own
Active X server with your own object hierarchy and methods in LabVIEW.
LabVIEW however can export a predefined Active X server interface that
is just another access method to its internal VI server interface.
With this interface you can determine what VIs are available to
control, load specific VIs from disk if you know their path and,
execute those VIs and passing parameters to it and receiving outputs.
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Active X server in some ways such as VBA or similar you should be fine.
If your software expects a specific Active X interface you have to
implement in the server application, you are out of luck with LabVIEW,
without using an external component such as an extra Active X server
DLL that translates between the expected interface and the exported
LabIVEW interface. But this last method is quite likely not worth the
hassle.
Rolf Kalbermatter
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Wes
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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
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>
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>unknown parameter Amplitude
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>unknown parameter Amplitude
>% $vi -namedarg Call [list Amplitude] [list [::tcom::na]]
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>5
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>unknown parameter Amplitude
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>unknown parameter Amplitude
>
> Who can help me with this? Who is the LabView Guru?
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Attachments:
NVI class.png ‏27 KB
shadowplayActiveX.png ‏32 KB
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http://www.ni.com/white-paper/2983/en/
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Does Labview's ActiveX server throw any events?

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