Reg. Events

How can we set the Events based on conditions in Smart forms...
usful answers rewards great

Hi raj,
If there is an internal table, and u r retrieving the data,
Then inside the loop U need to select 'sort on begin' or 'sort on end' option.
automatically, one Event will be generated.
In that Event, It'll ask which action is to be carried out automatically.
using this u can set the events automatically.

Similar Messages

Reg events in alv

Hi,
I created three radiobuttons in alv report including with line items.
whenver double click line items , its going next screen.,
Here my requirement is when i click one click radiobutton should selec

Handling will be same in both the cases. There is no Difference in Handling the events. The same can be handled using the Double click.
FORM user_command using ucomm type sy-ucomm selfield type slis_selfield.
CASE ucomm.
when '&IC1'.
case selefield-fieldname. "<---using this you can handle different fields.
when 'FIELD1'.
endcase.
endcase.
endform.

Why does this extra REG EVENTS cause memory leak?

LabVIEW 8.6.1f1, Win XP/Vista
My client reported a memory leak in a particular section of my code - my own tests confirmed it.
Although I have found it and eliminated it, I still don't understand what's really happening.
The RTEC RECEIVER CONTROLLER vi produces a cluster with various (maybe 30) event refnums in it.
For this particular piece of code, I am only interested in 5 of those events.
I was experimenting with registering the cluster as a whole (it works), and I inadvertently left the 2nd REGISTER EVENTS function in place.
So there are TWO event registration refnums, but only one of them is being used.
As the program proceeds, more and more memory is being consumed by LabVIEW (as reported by Windows Resource Monitor). Leaving the program with this particular window running overnight would use up a gig or RAM.
I verified that nothing else was consuming it - disabling the actual data handling did not fix the problem - eliminating this extra registration did fix it.
So my question is - why?
The registration only happens once, and then there are a million events or more in a 12-hour period.
I can guess that the registration creates some sort of queue within LabVIEW for the events to reside in. With no EVENT structure tied to that refnum to consume the events, that queue expands forever.
Is that a reasonable guess, or is there something I am missing?
Steve Bird
Culverson Software - Elegant software that is a pleasure to use.
Culverson.com
Blog for (mostly LabVIEW) programmers: Tips And Tricks

CoastalMaineBird wrote:
I can guess that the registration creates some sort of queue within LabVIEW for the events to reside in. With no EVENT structure tied to that refnum to consume the events, that queue expands forever.
Is that a reasonable guess, or is there something I am missing?
Yes, it's a very reasonable guess and is most likely what's happening.
You might say "LabVIEW could see I'm not actually doing anything with the reference and could therefore optimize the code by ignoring it (which is something LV does in some other cases)", but I'm assuming this is a corner case whoever wrote the original code did not think about, because this could be implemented only in a case where the node neither outputs a reference nor gets one as an input.
Try to take over the world!

Reg;Event Parameters

Hi all,
In Transaction SWO1 i have an event for which i could create parameters which refer to the data dictionary fields.Now i want to replace the individual parameters of the event with a structure (this structure has four fields).i am unable to do this.can anyone tell me what is the procedure to declare a structure under the events.
this structure should be available to create a binding between the event and the workflow.
any help would be appreciable with points.
thanks
Sandeep

Hi,
should be no problem at all?
In SWO1
Mark <event>
Click EVENT
Confirm "...with dictionary..." or sth like that (sorry, got only german screen)
Choose TABLE
Click OK
Mark all members of table(!!!)
Click OK
Confirm all table members
Voila! Got it?
Or didn't I get the problem? Then sorry.
Good luck!
Jo

How tho reg Event while user push on button on the toolbar

HI All,
I am using Alv tree and I add 2 specific button to the toolbar.
what I try to do is to register event for the button such as
ON_USER_COMMAND but the problem is that its not works
i am using the class cl_gui_alv_tree for tree and
for toolbarand for Toolbar cl_gui_toolbar.
any idea which event should i use when the user
press on button on toolbar ?
Best Regards
Alex

Hi Alex,
Did you check the SAP demo program 'BCALV_TREE_04' ?
BR,
Suhas

REG:Event pooling table insert record automatically

Hi All,
when ever database table update/insert a record then
I want to insert new record in to EPT table automatically.
Is any script available please send or send any links regarding.
please help me .
Thanks&Regards,
jell

You have to put the insert statement for EPL table into your ETL where the tables are updated/inserted.
- If you are using ODI, OWB as ETL then you can query the Run-time Execution tables to find the tables which were updated/inserted during the ETL and insert into EPL accordingly
- For BIAPPS, you can query DAC tables for the same

Event structure in Sub VI

Hello ,
I have a developed a program which captures video and user can save images out of it. I have used .NET reference to handle the video part, and the VI is attached in this post. Now i have to make this VI as a sub VI and running this from Main VI. I tried creating event structure in Main VI which i used in sub VI , still i could not suceed. Kindly assist me in this regard
Solved!
Go to Solution.
Attachments:
Webcam-Control-Projekt-mit-Reference-Design-2013_original.zip ‏286 KB

Hello Michael,
I have attached a model in which Main VI calls the Sub VI using Event Structure. Two events can occur in Main VI and their corresponding event Structure is called in Sub VI using Register events. When i run this VI the out put is fine some times but other times i need to trigger event many times before i can see its effect in Sub VI, my doubt is that Register events are reliable, whenever (during the execution of LV) if event occurs will surely its code in the sub Vi gets executed?
also I have put a indictor(numeric) in the SUb VI which i connect back to Main VI, when i run, i can see the result only in the sub VI not in the main VI.how to see in Main VI?
I have used the this model (which is attached ) to implement my project(which i already mentioned) . one switch for starting the video and other for recording the image. The video is getting started with out any trouble, but imgae is recorded only few times when i press the button which is for image recording, most of the time second event fails to get executed. Also there are difference in output when i run with and without "Highlight execution", why this happens, is this because of Reg events?
any more info if required let me know, i will provide.
Attachments:
Main_sub_VI.zip ‏18 KB

2012 Dynamic Event Registration Array of Controls

In upgrading to LV2012, I have discoverd what may be a bug, or at least an incompatability between 2011 and 2012 with respect dynamic event registration of an array of controls as opposed to individual control references.
This bit of code worked in 2011 but doesn't in 2012, with error 1 generated at the reg events block when run in 2012. I have been in contact with technical support, but haven't yet heard their take on this.
Any thoughts.
Solved!
Go to Solution.
Attachments:
Top Application.png ‏13 KB
SubVI.png ‏23 KB

I've got the bug too -- it appears this bug is present when arrays of control refs are connected to the ConPane. Link to cross-post on LAVA about the original problem. As Patrick@Vision mentions above, one workaround is to ensure that the array of control refs is no longer on the ConPane by collapsing the Register for Events node onto the caller.
a.lia-user-name-link[href="/t5/user/viewprofilepage/user-id/88938"] {color: black;} a.lia-user-name-link[href="/t5/user/viewprofilepage/user-id/88938"]:after {content: '';} .jrd-sig {height: 80px; overflow: visible;} .jrd-sig-deploy {float:left; opacity:0.2;} .jrd-sig-img {float:right; opacity:0.2;} .jrd-sig-img:hover {opacity:0.8;} .jrd-sig-deploy:hover {opacity:0.8;}

Lock front panel until the event case for this event completes

A Dynamic Event is a filtered event? Is this why "Lock front panel until the event case for this event completes" is not shown on Edit Event window dialog? I use Dynamic Event so I can subvi the event structure.
I need stop my app from locking the FP whenever the user double clicks on the numerical array value (<-- the FP freezes the mouse and renders it useless) and stops the value from ever being changed. This event is registered for Value Change (not mouse up or down) and I get a locked mouse. As yet in the UI, no value changed occurs but I get a locked mouse. A LV bug?
Trying to KISS, I can see this fixing this by moving ONLY the value change event to the top level VI instead of a dynamic registered event in a subVI. This will give me the option to NOT "Lock front panel until the event case for this event completes" .
Solved!
Go to Solution.

richjoh wrote:
Thx, Ben that fixed the problem when I unchecked "Lock panel...".
So it appears LV locks the panel during runtime once the Dynamic Reg Events is on BD and it doesn't matter if your case to handle the Reg Events is created or NOT... interesting. That's why my mouse persisted to "freeze up" although I deleted the case for my FP array.
Its situation like what you described that has given me many insights into how LV actually works. In one of my bbuggy VI's I found that a class wire can run a million miles through multiple sub-VI queues etc but the data itself is only touched when it has to be touched. in my case it was a crash while trying to write bogus class dat to a TDMS file.
I am glad you are back on course.
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

User Message event firing

I'm not sure of the best way to program what I have in my head.
If I send a UI Message >10000 then the User Message event is going to fire for any and all of those messages. This isn't much of a problem if it is a single callback VI that has a case structure to handle the different event numbers. This is what some of the examples are showing in the Developer Zone. My problem is that I will have several different VIs that will be handling User Messages. If I want to keep the same Reg Event Callback structure is the only real way to do this with different VIs is to register multiple callback VIs to the same event and just have each VI only respond to the event number that it is interested in? It seems to be a bit of a waste of CPU cycles if I have 5 different callback VIs and and 4 of them will get pinged on every event but not actually do anything. I'm not going to be firing these messages too rapidly (~0.5-1s) but I can just envision one of my other programmers running a little wild with this concept and then we eventually find out that LabVIEW starts to get finnicky having 20 different VIs registered to the same event even if only 1 of them will do anything for any given firing of the User Message.

Hi,
You might call the AEs about registering multiple VIs. I don't know if that is possible. I've never seen it.
What is the problem with a single callback VI that has a case structure to handle the different event numbers? Can't you paste your several different VIs into the case structure? Do you have to process your events in parallel, are they overlapping, or can you process them all serially? That's the only reason I can think of to not use the case structure.
You can use the single callback VI case structure to convert the TestStand User Events to LabVIEW Dynamic Events and pass them to the LabVIEW Event structure that the Exit Event is in. And then put your VIs in the Event structure. Basically what that does is make the single callback VI a router that forwards the event messages to another handler.
cc

Configure Event Callbacks in test stand using labview

Hi,
I was going through Full OI - Configure Event Callbacks.vi in the test stand example. Can you please explain me how the vi works and what is techniwue behind it?
When i open the individual VI's in the reference, I could see more that 1 control in the front panel. But Only the user parameter is wired in the vi? Why is it so?
Regards
Gopal

Hi Gopal,
When the TestStand Engine fires events, this VI specifies how your Operator Interface will respond. For example, let's examine the first event callback registered in Full OI - Configure Event Callbacks.vi , Exit Application. When the TestStand Engine receives the message to shutdown, and then finishes its neccessary shutdown procedures, it will send a message to the Operator Interface. For the Operator Interface to receive this message, it must "listen" for it. In LabVIEW, this is done by Registering an Event Callback. See the links below for details on how to implement this.
The answer to your specific question is in step 7 of the first link below. When TestStand sends the message to LabVIEW, there is information that is always passed. The other input controls contain this information. To create a VI that always includes these controls, right-click on the VI Ref input to the Reg Event Callback Property Node, and then select Create Callback VI.
Here are two references that talk about handling ActiveX callbacks in LabVIEW in general:
Registering and Handling .NET and ActiveX Events
Register Event Callback (Not in Base Package)
Cheers,
David Goldberg
National Instruments
Software R&D

Event when network changes

Hello all,
I am trying to figure how to use an activex callback when the computers(windows 7) network connection changes.
I am able to access and use properties of the NETWORKLIST.INetworkListManager class but I am not able to get the Reg Event Callback to work for NETWORKLIST.INetworkListManager.NetworkConnectivityChanged.
Does anyone have experience with this class or more ActiveX knowledge to get this working?
Perhaps there is another more commonly used method to see network changes without polling?
I hope I have provided enough details to get some help. Thank you for your time.
Attachments:
Z_NetworkConnectivityChangedEvent.vi ‏15 KB
Z_NetworkCPropteryChangedEventCallback.vi ‏8 KB

Wandern wrote:
Hello all,
I am trying to figure how to use an activex callback when the computers(windows 7) network connection changes.
I am able to access and use properties of the NETWORKLIST.INetworkListManager class but I am not able to get the Reg Event Callback to work for NETWORKLIST.INetworkListManager.NetworkConnectivityChanged.
Does anyone have experience with this class or more ActiveX knowledge to get this working?
Perhaps there is another more commonly used method to see network changes without polling?
I hope I have provided enough details to get some help. Thank you for your time.
I cannot get this working in LabVIEW 2013 32-bit.
Not sure why.
I am able to get the callback to work in C# Express 2010.

Register Event Crashes LabVIEW if Event Type isn't Selected.

Hi I think I have found a possible bug in LV2011 SP1.
- Wire a Reg Event property node to the Dynamic Event Registration Terminal of an event structure
- Add an event case
- Click the Dynamic Event
- LV Crashes
Source code included, try to add the unspecified event and watch as LV crashes.
Br,
/Roger
Solved!
Go to Solution.
Attachments:
LVCrash.vi ‏5 KB

Intaris wrote:
I had a case very similar to this today, I think it was to do with exactly what you describe but it was in LV 2012.
I seem to have a knack of crashing LV. I'm really good at it. Maybe I should be an internal tester for NI?
Shane.
What? they do testing? When did this happen?
I'm just kidding, or, perhaps not?
We all like to Love/Hate NI, right?

Event CallBack in TestStand - Labview OI

Hi everyone,
i am using the simple interface for labview of teststand, i have modified the interface what i like, now what i want to do is when the user press the control button to execute a sequence the system ask the user for something and depending of it answer execute or not the sequence, for this i have create a new event callback, modifying the configure event callback.vi, what i introduce in the Reg Event Callback is that when StartExecution event starts it run the callback vi that contains the question to the user.
It works well because when the user press the run sequence control button or the restart contorl button, the system ask the user. But the problem is when the user press the exit control button, the system ask too.
Why occurs this, and how can i fix it??
Thank you in advance

Hi Marith,
This behavior is occurring because the Application Manager automatically executes the FrontEndCallbacks sequence file when the Operator interface starts, and again as part of the shutdown. To prevent this from occurring, we'll need to check that the execution is not the FrontendCallbacks execution before launching the dialog (the other case is "FrontEndCallbacks.Seq"):
You also may want to consider a couple alternative implementations:
use the UImessage event to run the code when the UIMsg_ModelState_Initializing message is posted (when the process model begins executing)
putting this code in the process model rather than the User interface - in this case we could just add a step in the setup of the model, and terminate the execution if the user chooses.
Al B.
Staff Software Engineer - TestStand
CTA/CLD

How to access a property in a static vi reference

Hi,
I'm completely new to Labview and I'm working on a project that includes controlling CANalyzer from LabView by an ActiveX control.
In CANalyzer I have a CAPL function that I need to call from LV. The problem is that the function must be created in the onInit event when starting a canalyzer measurement. The only way I have found to create the function is to use a "reg event call back" and create the function in a "static vi reference". This works and I can call the funtion from that vi, but I'm not able to call the function from anywhere else but from the "static vi reference" and since it must be strictly typed I can not add any output connector where I can add a reference.
I've been trying to solve this for thee days now and it's starting to feel hope less.
In VB the complete code would look something like:
    Dim WithEvents gCANApp As CANalyzer.Application
    Dim WithEvents gMeasurement As CANalyzer.Measurement
    Dim gSendFunction As CANalyzer.CAPLFunction
    Dim Y
    Set gCANApp = New CANalyzer.Application
    gCANApp.Open ("C:\...xxxx.cfg")
    Set gMeasurement = gCANApp.Measurement
    gMeasurement.Start
    gSendFunction.Call
   'Measurement OnInit event handler
   Private Sub gMeasurement_OnInit()
       Set gSendFunction = gCANApp.CAPL.GetFunction("MyFunction")
   End Sub
This would work fine since I have a reference to gSendFunction in my main code.
My LV code looks like this:
and my static vi ref looks like this:
What I think I need is a reference to the data thread coming from "GetFunction"
If any one can help me solve this I would be very happy!
Best Regards
Henrik

Hi,
you could add another input to your static vi ref where you input the reference to a reference display element which sits in your other vi (upper image).
Then you could make a signaling value change to the reference display element from within your static vi ref.
In your other vi set up an event structure to detect the value change. In that event close the vi - this will let you have the desired reference as output of that vi.
Regards Florian

Problems with ActiveX Callbacks in LabVIEW 7

Have encountered an interesting problem with ActiveX "Reg Event Callback" in LV7 (WinXP):
In a nutshell, when a lot of events fire in rapid succession, the user-interface locks up.
The events still fire, and the front panel controls update, but the front panel will not respond to clicks. Interestingly, if the block diagram is open, you can stop it and turn on execution highlighting, etc...
- I've discovered that the problem we're encountering is related to multiple events firing before the (reentrant) callback VI has finished executing from the 1st event.
- by watching the Performance data in task manager, and tracking the # of handles used by LabVIEW, I find that when this happens, the # of handles increases, b
ut never decreases until you stop the VI
- I would expect several (nearly) instantaneous events to launch multiple copies of that callback VI, and I can believe that would increase the # handles, but I would expect that LabVIEW would catchup shortly thereafter and the # handles would return to its starting count.
As an aside, using the old ActiveX event and callback method with the exact same version of the activeX control does not have this problem, events just queue up and then fire appropriately.
Anyone seen anything like this?
Anyone (NI guys) have any ideas?
Follow up question (NI guys): when will the support for the old ActiveX event stuff dry up?
Thanks in advance,
Ben
Ben Zimmer
[email protected]
Software Developer
Meikle Automation

Hi Ben,
The error message warns about the use of three ActiveX Event VIs that will no longer be supported in future versions of Labview. Following version 6 of Labview, the use of ActiveX Event VIs is shifting to the use of Register Event Callback VI instead. In looking at your screenshots, I did not see any use of the older ActiveX Event VIs. If possible, try attaching the actual VI to the post and I will take a look at that.
At least in terms of support, phone support currently exists for Labview 6 and 7. With the release of Labview 8, support for Labview 6 will slowly be phased out. In this case, phone support for the ActiveX Event VIs will no longer continue as they are no longer included in the versions of Labview for
which phone support is provided. However, Discussion Forums and web-based resources would be your best venue of support for those features.
I would strongly recommend that you migrate to replacing ActiveX Event VIs to using the Register Event Callback VI. The following is a KnowledgeBase article describing the transition of ActiveX in Labview:
Migrating from the ActiveX Event VIs to Using the Register Event Callback Node
Also, are you using the Automation Open/Close VIs? These two VIs will allow acquire/release informatio nof the ActiveX object. I have attached a couple example programs that are included in Labview to help demonstrate this concept.
Hope this helps!
Kileen Cheng
Applications Engineer
National Instruments
Attachments:
ActiveX_Event_Callback_for_Excel.llb ‏944 KB
ActiveX_Event_Callback_for_IE.llb ‏972 KB

Reg. Events

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