LabVIEW

[SnowForest]

Hi All,

LV 8.6.1

I try to get value change event from ActiveX component. I have browsed forum and examples through but I can't get an idea how to use "callback  vi". E.g. in example "ActiveX Event Callback for IE.vi" there is used "callback vi". I added an example where value change event and mouse down event are programmed to event structure. Mouse down event work okay but value change not. Can someone describe what I must add to my example vi that value change event works okay?

BR, Jim

[Julien_2831 · Accepted solution]

Here's the solution ! "Value change event" is not performed into event structure but into "Callback VI".

[SnowForest]

Hi, Krsone

Thank you very much. Your example works perfect. I forget to mention that I need this event also to event structure. My code structure is producer-consumer and this value change event should be passed also to queue. Should I add variable to "callback vi" or is there any easier way ?

BR, Jim

[Norbert_B]

Jim,

in order to synchronize ActiveX callbacks with the producer/cosnumer, you have to either

- create an user event in the callback and capture this in you producer  or

- obtain the queue between producer and consumer in your callback and insert the appropriate element into the queue in the callback.

I think the second option is easier to implement but is more limited in its functionality.

hope this helps,

Norbert 

[LabBEAN]

I modified the VIs for an upcoming User Group.  As Norbert B mentioned, I used user events to signal back to the main code that we got the DTPicker change event.

[LabBEAN]

Norbert-

14 posts to go... Congratulations in advanced (pre-enthusiast)!