Close reference from event data node

When using an event structure, I often times use
the Control Reference output in the Event Data Node. Do I need to
close these references each time the corresponding event fires? In
other words, are the reference created from this node unique each time
that particular case is called?

The Event Structure does not create duplicate references to the same object if the event case is called multiple times, so you don't have to worry about having dozens of open references. You can actually verify this by type-casting your control reference to an I32 to see the exact 32 bit value (or just probe the refnum). Firing the event case multiple times produces the same reference.
You really don't need to worry about closing the reference in this case. In general, LabVIEW will figure out that the control references are no longer valid as soon as the VI goes idle, and it will clean them up. Closing references is good practice if you're going to be opening a large number of references (for instance, getting references to all controls on a large Front Panel), and you don't want them all to stay in memory the whole time.
Jarrod S.
National Instruments

Similar Messages

How to use event structure of event data nodes event filter nodes in programming

hi,
I need manual of how to use 'event structure' events of 'event data nodes' and 'event data filters'...please help me....
Regards
Ravindranath

I'm not really sure what you are looking for here. Did you do a search in the LabVIEW help for Event Structure?
The Event Data Node just returns information about the event, like control data, control reference, what caused the event, etc.
The Event Data Filters are just used in Filter Events. This allows you to discard an event or change the data that the event will recieve.
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
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Event data node time

I'm using an event structure with a DAQmx event.
Inside the event structure I read the "time" of the event.
Does anyone know if this time is
a) the time the event was detected in the DAQ board
b) the time the event information was transferred to LabVIEW ?
Thank you

Hi,
Speaking about the time node in the event structure, to say that 'time node' equals the time at the moment the thread focuses on the evt structure is not completly true.
Before my recent experience, I do thought so, but it's only true for static events and not for dynamic events.
If a dynamic event is registered, the time node contains the time of the event triggering and not the time of the event structure execution (I could provide a vi which shows that behavior).
I assume that in a dynamic event, Labview knows the time of the dynamic event triggering and transmits it to the event structure whereas in hardware event, I suppose that Labview focuses on the event structure at the time it can do it (not busy in the same event structure). So the 'time node' matches the event structure execution and the Labview event detection, but not the time the event occured physically.
I don't know if this feature is documented, but if it's not the case, it could lead to critical issues.
Regards.

How do you pass vi references from one event to another

I have a vi which gets vi references (thereby loading the vi's into memory) for all the vi's in a given directory when a user clicks a button on the front panel. To do this I use an event structure. My question is whether it is possible to have another event (user button on the front panel) which unloads the vi's from memory. I have tried passing the vi references that are initially generated to the close reference function but whenever I do I get a 'vi reference invalid' error. Does this have to do with trying to pass the vi references between one event and another? If I use a local variable simply pass a reference to another indicator and then probe it, the originally-generated refnum and the local vari
able refnum match up. However once I try to wire that same indicator to the close reference function I get the 'vi reference invalid' error. Is there a different/better way to unload the vi's from memory based on a user button click? Any suggestions would be welcome.
Jason
Attachments:
Load_Directory_of_vi's.vi ‏57 KB

Several problems with your code:
1... Bad idea to use lights as buttons. Yes it can be done, but it's not "natural".
2... If you've gotta do that, set their mechanical action to "LATCH WHEN RELEASED"
3... Because of #2, you are getting TWO copies of every array when you click the LOAD VIs light (er... button).
4... No need for the conversion from path to string and back - use BUILD PATH to append each file name to he folder path.
5... Set the BROWSE OPTIONS on your PATH control to EXISTING DIRECTORY to allow browsing of directories, not files.
6... Your code doesn't care whether the file is a .VI file, or a .ZIP file, or a .TXT file, or what. Use the PATTERN input on the LIST function to discriminate.
7... Your code is only storing the latest refer
ence, not the array of references.
8... An ERROR DIALOG on the OPEN REFERENCE function will tell you that you're getting an error. Why? You are asking to prepare a non-reentrant VI for reentrant execution (why use options = 8?)
9... Because of #8, the latest VI reference is invalid.
Steve Bird
Culverson Software - Elegant software that is a pleasure to use.
Culverson.com
Blog for (mostly LabVIEW) programmers: Tips And Tricks

[svn:cairngorm3:] 16810: Changed close event from flash.events.Event. CLOSE to mx.events.CloseEvent.CLOSE.

Revision: 16810
Revision: 16810
Author:   [email protected]
Date:     2010-07-03 03:32:49 -0700 (Sat, 03 Jul 2010)
Log Message:
Changed close event from flash.events.Event.CLOSE to mx.events.CloseEvent.CLOSE. See MXML examples in PopupTest.
Modified Paths:
    cairngorm3/trunk/libraries/PopupTest/src/samples/ModulePopups.mxml

Hmmm Strange!!!
Seems like a bug which requires target for parallel effect while hide only but does not set it.
For the time being you can remove the sequence effect as there is no othe effect other than parallel and use effect like
         <mx:Parallel id="fadeOutTw">
            <mx:Fade alphaFrom="1.0" alphaTo="0.0" duration="1000"/>
            <mx:WipeUp duration="1000" />
        </mx:Parallel>
or you can also set target explicitly like :
<mx:Sequence id="fadeOutTW" >
        <mx:Parallel target="{largeImgTW}">
            <mx:Fade alphaFrom="1.0" alphaTo="0.0" duration="1000"/>
            <mx:WipeUp duration="1000" />
        </mx:Parallel>
    </mx:Sequence>
I have tested on this code, and works fine. Hope this helps you
-Vikash

[svn:cairngorm3:] 16809: Changed close event from flash.events.Event. CLOSE to mx.events.CloseEvent.CLOSE.

Revision: 16809
Revision: 16809
Author:   [email protected]
Date:     2010-07-03 03:05:21 -0700 (Sat, 03 Jul 2010)
Log Message:
Changed close event from flash.events.Event.CLOSE to mx.events.CloseEvent.CLOSE. See MXML examples in PopupTest.
Modified Paths:
    cairngorm3/trunk/libraries/PopupTest/.actionScriptProperties

Hmmm Strange!!!
Seems like a bug which requires target for parallel effect while hide only but does not set it.
For the time being you can remove the sequence effect as there is no othe effect other than parallel and use effect like
         <mx:Parallel id="fadeOutTw">
            <mx:Fade alphaFrom="1.0" alphaTo="0.0" duration="1000"/>
            <mx:WipeUp duration="1000" />
        </mx:Parallel>
or you can also set target explicitly like :
<mx:Sequence id="fadeOutTW" >
        <mx:Parallel target="{largeImgTW}">
            <mx:Fade alphaFrom="1.0" alphaTo="0.0" duration="1000"/>
            <mx:WipeUp duration="1000" />
        </mx:Parallel>
    </mx:Sequence>
I have tested on this code, and works fine. Hope this helps you
-Vikash

[svn:cairngorm3:] 16808: Changed close event from flash.events.Event. CLOSE to mx.events.CloseEvent.CLOSE.

Revision: 16808
Revision: 16808
Author:   [email protected]
Date:     2010-07-03 03:04:40 -0700 (Sat, 03 Jul 2010)
Log Message:
Changed close event from flash.events.Event.CLOSE to mx.events.CloseEvent.CLOSE. See MXML examples in PopupTest.
Modified Paths:
    cairngorm3/trunk/libraries/Popup/src/com/adobe/cairngorm/popup/PopUpBase.as
    cairngorm3/trunk/libraries/PopupTest/.actionScriptProperties
    cairngorm3/trunk/libraries/PopupTest/.flexProperties
    cairngorm3/trunk/libraries/PopupTest/src/PopUpMXMLExample.mxml
    cairngorm3/trunk/libraries/PopupTest/src/samples/MyPopup.mxml
    cairngorm3/trunk/libraries/PopupTest/src/samples/ZoomAndFadePopUpBehavior.mxml
    cairngorm3/trunk/libraries/PopupTest/src/samples/parsley/ParsleyPopup.mxml
Added Paths:
    cairngorm3/trunk/libraries/PopupTest/src/samples/ModulePopups.mxml

Hmmm Strange!!!
Seems like a bug which requires target for parallel effect while hide only but does not set it.
For the time being you can remove the sequence effect as there is no othe effect other than parallel and use effect like
         <mx:Parallel id="fadeOutTw">
            <mx:Fade alphaFrom="1.0" alphaTo="0.0" duration="1000"/>
            <mx:WipeUp duration="1000" />
        </mx:Parallel>
or you can also set target explicitly like :
<mx:Sequence id="fadeOutTW" >
        <mx:Parallel target="{largeImgTW}">
            <mx:Fade alphaFrom="1.0" alphaTo="0.0" duration="1000"/>
            <mx:WipeUp duration="1000" />
        </mx:Parallel>
    </mx:Sequence>
I have tested on this code, and works fine. Hope this helps you
-Vikash

Event on close Browser to unlock Data

Hi experts,
I have an OVP Floorplan and the problem is, that by closing the Browser, all Data Locks remain in SM12.
Is there an Event or Method called before closing the browser or how can I Unlock the Data?
I've red, that the Method WDDOINIT of the Application Component Controller is called, but how can I access this Method.
I have Feeder-Klasses for the UIBBs and an Assistance Class for the Application Component Contoller, but there is no Method WDDOINIT in this Assistance Class!
Thanks and regards,
Sebastian

Hello Sebastian,
I solved the browser close problem enhancing the class CL_FPM, to release locks/resources (since the exit event is not propagated from WD to FPM). To do this our own methods have to be called somehow before framework is releasing resources in method DELETE of class CL_FPM.
The steps required to reach this:
Create an enhancement of class CL_FPM
Add a new member table attribute f.e. mt_zzcallbacks table to class CL_FPM
Add a new public instance method f.e. zzregister_callback to class CL_FPM, to put any class instance and method to the table above, from your own classes.(Methods added should not contain any obligatory parameter and has to be of type instance public also)
Create a pre-exit of method delete of class CL_FPM and loop over the callback table calling the methods dynamically (catch the following exceptions: ABAP Keyword Documentation).
Put your code to release the locks/resources into the registered callback methods (it will be called exiting the application )
This works when user closes the browser/tab improperly.
Of course you can provide a possibility to close the application using a button, where you can do additional checks etc, data loss notification etc.
So if you use a Close button with event FPM_CLOSE (doing checks etc. ) and releasing your locks also handling the event FPM_CLOSE, then you can create a new method in class CL_FPM to deregister the method from the callback table, since you did free already and not necessary to do it again using the callback.
Kind regards
Attila

The DNS server has encountered a critical error from the Active Directory. Check that the Active Directory is functioning properly. The extended error debug information (which may be empty) is "". The event data contains the error.

got event ID 4015 and source DNS-Server-Service. please suggest how to fix this issue
The DNS server has encountered a critical error from the Active Directory. Check that the Active Directory is functioning properly. The extended error debug information (which may be empty) is "". The event data contains the error.
Raj

Hi
first run "ipconfig /flushdns" and then "ipconfig /registerdns" finally restart dns service and check the situation,also you can check dns logs computer management ->Event viewer->Custom Views->Server roles->DNS.

How to get the data from the model node like a table ?

I want to get the data from the model node once a record ,and the node is bound to a internal table in the RFM which I called in the R/3 system. Who can give me some advice to achive it?Thank you!!

Hi,
To get the data from the node:
wdContext.node[your node name].current[node name]_InputElement().get[specific element in the node];
or you van use:
wdContext.current[your node]Element().get[your element in the node];
examples:
wdContext.nodeZ_Mepro_Po_Detail_Stock_Distri_Input().currentZ_Mepro_Po_Detail_Stock_Distri_InputElement().getUcpd_Flag();
wdContext.currentT_Delv_ReqsElement().getShelflife();
regards,

How to filter the Event Data from the EventHub when consuming data?

We know the EventHub has the filter function. I'm designing a new solution for a customer and it looks like EventHubs are great for sending and receiving our near-realtime
data. Downside is when receiving the data, we receive all data of all our devices in the world. Most of the time, our clients only want to see data of one (or a few) device. We could of course filter the data by ourselves, client side, but
this would cost a lot of bandwith.
From the
FeedBack, it said Filters will be tied to Consumer Groups. And I Check the Consumer Group Class, it has the Create Time and Update Time, but it
has no set Function,
So how to use the Consumer Group to filter Event Data during the Receiving data?
Because in our solution, we use the EventHubHost to consume data, if our service bus worker role restart, we will receive all data in the EventHub, but we only want
to receive the latest data,
If we use the EventHubHost to consume data, can we also to filter data? If yes, how to do?
Thanks very much!

Yes right,
AFAIK there isn't a filter feature for Event Hub. The only way to have now is to put a specific property inside your EventData that consumer group can check to filter if it is interested in the data or not.
Paolo.
Paolo Patierno

How to search data from a context node.

Hi Friends,
Thanks for ur help for previous problem . I am facing some other problem i.e how to
search data from a context node.
i have a context node :-
Car(main node) which consist of details, owners, engine and Brand as its sub node.
the value attibutes of difft nodes are:-
Car- category
Details- Mileage, Price, registration_no, miles_used
owner - name, phnno,addrs
Brand - main_brand, co_brand
Engine- Bhp,Rpm
Now i have to apply a search criteria on the basis of price, miles_used .
pls help to implement that .
Thanks & regards
Pravin jha

Hi PRAVIN,
What I can understand from your problem is that, you have a list with various properties and you want to display them and search them in your WD App. If I am correct, use the following approach:
Instead of using "details, owners, engine and Brand" Nodes, use the attributes inside the parent node. i.e in the node Car, add all the attributes viz. Mileage, Price, registration_no, miles_used, name, phnno,addr etc.
Now you can create a table of this node "Car" and can easily search on the basis of any criteria.
I hope this solves your issue. If you are looking for something else, please revert, I'll be happy to help you.
Cheers!!!
Umang

I have Photoshop Elements 7.0 and when I go to sort the photos in order (from oldest date) I keep getting the message "Photoshop Elements 7.0 has stopped working" and then the program closes. Sometimes, eventually it has sorted as I request but today thi

I have Photoshop Elements 7.0 and when I go to sort the photos in order (from oldest date) I keep getting the message "Photoshop Elements 7.0 has stopped working" and then the program closes. Sometimes, eventually it has sorted as I request but today this has been rejected over 15 times. What is wrong?

Try the licensing service update:
http://helpx.adobe.com/creative-suite/kb/error-licensing-stopped-windows.html
EDIT I see that maybe you did (is that the patch you mean? ); if so, try the other suggestions there.

Retrieve data from other context node within the same context

Hi Experts,
I want to redefine method BUILD_TABLE for a table context node and I need to access data from another context node within the same context. I have looked through the methods of class CL_BSP_WD_CONTEXT_NODE_TV but could not find a mean of retrieving the other context nodes.
Any ideas?
Thanks a lot. Your help is appreciated.
Cheers,
Jens

Hi Jens,
Check this [wiki|http://wiki.sdn.sap.com/wiki/pages/viewpage.action?pageId=201066680] it should be helpful.
Regards,
Shobhit

Calendars and event data lost in mountain lion upgrade from snow leopard on mac book pro

I just upgraded to mountain lion today. It appears my contacts and emails were transferred without loss to the new system but all of my calendar data and the calendars themselves have disappeared. Does anyone know how I can get my old calendars and event data back? I backed up my laptop on time machine before doing the upgrade, so my old calendars should be on my external hard drive. I'd like to simple recover the data from the laptop if it is just hidden somewhere. Alternatively, if someone could tell me how to import the backed up calendars back in that might be a good plan B. I also still have the old calendars on my iphone which I am afraid to sync for fear of data loss.
I looked through previous responses in the community to this same question and I tried deleting the account and adding it back in but that did not work. Any assistance would be appreciated. Apple support is giving me an cold shoulder that is rather unexpected given my past good experience with Apple support. Bummin out over here
Aneata

Which way do you reinstall OSX?
I would go through the recovery partition, check Disk there and then run the installer. make sure you have a reliable connection the the Internet.
This could be a third party app you have running in the background that is crashing. what exactly is crashing ?
are you getting kernel Panics?
You are not able to simply roll back to Snow Leopard, you will have to have a SL disk, and then erase and install SL onto you hdd/ssd. This will erase ALL of your data so I hope you have a Time Machine backup or bootable clone.
I believe your issue is with a third party application installed.
More information is needed.
Call 1-800-My-Apple or file a dispute here https://expresslane.apple.com/Issues.action
On a personal note, I think you are missing out on ML and need to figure out if there is an application running that is causing ML to crash.
Usually a reinstall fixes my issues.

Close reference from event data node

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