Value (Signaling) property and programmatically generate value change event?

[Peter_B]

I need to do exactly what Frans wanted to do.

So 6 years on, is there an event based (non-polling) method to have an ActiveX client (to a LabVIEW ActiveX EXE server) do the equivalent of setting the value signalling Property of a control on that EXE's FP?

rgds

Message Edited by Peter_B on 05-27-2010 12:58 AM

[Peter_B]

I guess not.  So my chosen solution is to write a vi which grabs a reference to the desired control and sets the Value Signaling property of it.  This vi will be called from my C# .NET code via the ActiveX method   object.Call([paramNames], [paramVals]) 

There is a great example here for how to do thism just scroll down to the bottom and click on callinglvcsharpusingactivex.zip

rgds

[craigc]

Perhaps what you are after is a callback.  Here is a page referencing .net but I think you can use them with active X as well.  I have used them within LabVIEW itself instead of polling.

http://decibel.ni.com/content/docs/DOC-9161

Craig

here also is doing it with activeX http://digital.ni.com/public.nsf/allkb/292FA0C0E7A0D69B86256D18007F525E

Message Edited by craigc on 02--06-2010 10:42 AM

[Peter_B]

Thanks Craig.  I considered using an Event callback and got most of the way to implementing it in C# until I realised how much simpler it is in both programming environments to do it the way I mentioned above.  I was already communicating to the LabVIEW ActiveX EXE server from the C# environment, so it seemed a logical and simpler way to solve the problem.  Events in C# require too much coding compared to using the ActiveX call method I highlighted above.

rgds

[chrao@borgwarner.com]

Can some one please help me with what is the correct method to call 

SetControlValue method so that respective change event triggers automatically ? 

[Peter_B]

I don't think that is possible using the Method (Control Value Set), instead write to the Value Signaling property.

https://knowledge.ni.com/KnowledgeArticleDetails?id=kA00Z0000004BKFSA2

You can also do this in a sub vi by passing a reference to the control into a generic property node and selecting Val(Sgnl)