Event handling using CAN?

I am aware of how to make LabView respond to user interface events (keyboard presses, button presses, mouse moves, etc) and I'm also aware that the same event handling structure can be used to handle external (non-GUI) events- like those generated by a digital edge on a DAQmx input. My question is whether the same event handling structure can be used to handle external events coming in on a CAN network- via NI-CAN or otherwise?
Is there a good reference which summarizes ALL general types of events that can be handled in this way- not just the standard GUI events? I have a feeling that ActiveX and VISA are other ways to generate events, but can't find a good resource in general - or specifics on the NI-CAN side.
Thanks!
Nate

Thanks Mike- still not sure I understand. What should I wire to the Create User Event block in order for available events to show up in the dialog which allows me to configure events in a given frame? For example, I have an external micro-controller communicating with LabVIEW using a CAN network. Usually the communication is started by LabVIEW and sends commands out- but I also want to be able to handle asynchronous messages generated by this micro-controller in an event fashion without having do any polling. Is there some reference I can wire to the Create User Event block which will make an event like "Incoming CAN Network Traffic" available to be handled in an event structure?
Thanks again!

Similar Messages

Event handling using htmlb

Hi,
I am creating a small bsp application where I have Test.htm and error.htm pages. Test.htm page contains a button which when clicked should traverse to the second page which does not occur. Then code I have for the event handling is given below.
CLASS cl_htmlb_manager DEFINITION LOAD.
IF event_id = cl_htmlb_manager=>event_id.
DATA: event TYPE REF TO cl_htmlb_event.
event = cl_htmlb_manager=>get_event( runtime->server->request ).
IF event->name = 'button' AND event->event_type = 'click'.
<b>    DATA: button_event TYPE REF TO cl_htmlb_event_button.
    button_event ?= event.
</b>
ENDIF.
    CASE event->id.
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        navigation->next_page( 'ERROR' ).
      WHEN OTHERS.
    ENDCASE.
ENDIF.
Also please explain me the lines of code given in bold fonts.
Regards
Noufal

hi Noufal,
The difference is that :
When you are not using HTMLB library but using simple HTML buttons ussing <INPUT TYPE = BUTTON > then
to capture that event you should use
onclick = OnInputProcessing(button_id) ,
where "button_id" is the value in "event_id" variable in "OnInputProcessing" Event.
But if you are using HTMLB then no need for this .
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onClick = "button_id"
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For ex :
data event type ref to CL_HTMLB_EVENT.
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Problem in event handling using oo abap code

Hi,
My requirement is i need to disply 3 blocks in ALV format.I have done that.Now my problem is if i double click on aufnr of the first block, it should call the transaction code. I have written the code in oo abap but i have used function modules for ALV.Now my doubt is 'How to write an event once the user double click on the particular field of the first block, it should call the tcode " using object oriented code.
How to populate the heading for each block using oo abap code.
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Anus

hi.....
Use Double_click event handler method of class cl_gui_alv_grid of first block....
if not solved .
Send me Your program lines ...........
Best Regards
Prabhakar

Is there a C# example of using the ExpressionEdit Control Custom Button Event Handler

TestStand 4.1
C# 2008
I have added the event handler to the ExpressionEdit events as I would any event handler:
exprEdit.ButtonClick += new NationalInstruments.TestStand.Interop.UI.Ax._ExpressionEditEvents_ButtonClickEventHandler(_ExpressionEditEvents_ButtonClickEvent);
Next, I create the Event Handler using the syntax
public void _ExpressionEditEvents_ButtonClickEvent(NationalInstruments.TestStand.Interop.UI.ExpressionEditButton btn)
I get the following error when I try to build:
Error 1 No overload for '_ExpressionEditEvents_ButtonClickEvent' matches delegate 'NationalInstruments.TestStand.Interop.UI.Ax._ExpressionEditEvents_ButtonClickEventHandler'
I assume this means that I don't have the correct parameters or types in my Event Handler declaration but it matches the Object Browser. Any ideas on what I am missing?
Solved!
Go to Solution.

Try removing the "Ax." from your namespace qualifier as I marked below. I think you want the one in just the UI namespace.
Edit: well not necessarily. Is your exprEdit variable declared as "NationalInstruments.TestStand.Interop.UI.Ax.AxExpressionEdit" or as "NationalInstruments.TestStand.Interop.UI.ExpressionEdit"?
If it is an AxExpressionEdit then I think you will want your event handler to look like this:
void exprEdit_ButtonClick(object sender, NationalInstruments.TestStand.Interop.UI.Ax._ExpressionEditEvents_ButtonClickEvent e)
-Jeff
skribling wrote:
TestStand 4.1
C# 2008
I have added the event handler to the ExpressionEdit events as I would any event handler:
exprEdit.ButtonClick += new NationalInstruments.TestStand.Interop.UI.Ax._ExpressionEditEvents_ButtonClickEventHandler(_ExpressionEditEvents_ButtonClickEvent);
Next, I create the Event Handler using the syntax
public void _ExpressionEditEvents_ButtonClickEvent(NationalInstruments.TestStand.Interop.UI.ExpressionEditButton btn)
I get the following error when I try to build:
Error 1 No overload for '_ExpressionEditEvents_ButtonClickEvent' matches delegate 'NationalInstruments.TestStand.Interop.UI.Ax._ExpressionEditEvents_ButtonClickEventHandler'
I assume this means that I don't have the correct parameters or types in my Event Handler declaration but it matches the Object Browser. Any ideas on what I am missing?
Message Edited by Jeff.A. on 06-11-2010 03:25 PM
Message Edited by Jeff.A. on 06-11-2010 03:28 PM

How to run a dialog's method from a button's event handler?

I've created my first dialog from the samples, but I am having trouble figuring out how to run a method in my dialog from an button's event handler. Can anyone please point me in the right direction?
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This may not be the reason, but when using the way I create dialogs 'this' inside of an onClick points to the control.
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Event handling in LOV

Hi There,
We have a use-case where we need intercept the event of af:inputComboboxListOfValues component.
I have table, which has three columns, Name, Description and Label.
I have a LOV on Name column.
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I know there are several events in the af:inputComboboxListOfValues component, launchPopupEvent, returnPopupEvent and valueChangeEvent.
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Thanks in advance.
Thunder
Edited by: 984466 on 2013-3-7 下午4:59
Edited by: 984466 on 2013-3-8 上午12:51

Hi,
first of all, never post questions regarding internal JDeveloper builds (11.1.1.7 is not released to public) on this public forum. You are from Oracle and therefore have internal channels for this (note that using internal builds the problem could be with the build and not necessarily the code alone).
To your question:
I don't understand why
+"2. returnPopupEvent and valueChangeEvent event will be handled by framework in one request, there is no chance for user's interaction."+
doesn't work. If you set the "name" column component to autosubmit="true" then the listener fires as soon as you move out of the field and you can raise the alert. The current row in the binding points to the row you changed the name for and as such the value can be unset (the value change listener shows you the before and after value)
Frank

Event handling in portal through sap netweaver.

Hi...
Please let me know..how to evoke event handling in iviews..thru sap netweaver in ep.

Hi,
For iview event handling you can use EPCF (<b>Enterprise Portal Client Framework (EPCF) provides an infrastructure for scripting used in iViews and by the portal</b>.)
http://help.sap.com/saphelp_nw04s/helpdata/en/ce/3e98408d953154e10000000a1550b0/frameset.htm
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Go to this link and download the pdf.This could be some help to you.
Thanks
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/Helpfull answer will be rewarded with points/

Event handling in Network UI element in Webdynpro

Hi ,
I am developing a hierarchial graph using Network UI element.I want to incorporate event handling so that the graph will respond to user actions like on double clicking a node an URL will be opened.I can notproceed with the event handling.
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Regards
Nayeem

Hi Nayeem,
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Under events , you can see a list of events defined for this UI element.
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IWDNetwork network = (IWDNetwork)view.createElement(IWDNetwork.class);
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Ashish

User Recon and Event Handler Issue in OIM11g

Hello Experts,
I am developing a Trusted Source Recon (User) for a proprietary application. I have devloped two java classes and put them into a jar file and placed the same jar in both ScheduleTask and EventHandlers directory of OIM.
1.UserRecon class -- for User Recon
2. EventHandler class -- update user's password after reconciling the user using API.
In the User Recon class , I have defined a static HashMap variable to store the user and user's password as a class variable. The flow will be like this,
1. Query trsuted source
2. Reconcile user (except password because password can not be)
3. Update the map with userid (key) and password.
4. After reconciling , In the event handler use the same map to read user's password and set the password in OIM using API. (setXelleratePassword).
5.After successful password set remove the entry from Map.
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This worked in OIM9102. But when I tested the same in 11g it did not work.... Though the User Recon class updates the record into the HashMap , In the eventhandler , the HashMap is always coming as "empty".
I did the below changes for 11g,
1. Modified the EventHandler class to suite for 11g.
2. Deployed the event handler as a plugin
3. Placed the same jar file in Schedule task directory of OIM 11g
I am unable find out where it is going wrong?? and tired of troubleshooting. Can you assist me ?
Thanks and Regards
INIYA

INIYA wrote:
Hello Experts,
I am developing a Trusted Source Recon (User) for a proprietary application. I have devloped two java classes and put them into a jar file and placed the same jar in both ScheduleTask and EventHandlers directory of OIM.
1.UserRecon class -- for User Recon
2. EventHandler class -- update user's password after reconciling the user using API.
In the User Recon class , I have defined a static HashMap variable to store the user and user's password as a class variable. The flow will be like this,
1. Query trsuted source
2. Reconcile user (except password because password can not be)
3. Update the map with userid (key) and password.
4. After reconciling , In the event handler use the same map to read user's password and set the password in OIM using API. (setXelleratePassword).
5.After successful password set remove the entry from Map.
The idea is to avoid making additional call to trusted source to retrieve the user's password.
This worked in OIM9102. But when I tested the same in 11g it did not work.... Though the User Recon class updates the record into the HashMap , In the eventhandler , the HashMap is always coming as "empty".
I did the below changes for 11g,
1. Modified the EventHandler class to suite for 11g.
2. Deployed the event handler as a plugin
3. Placed the same jar file in Schedule task directory of OIM 11gHope there are two jars, if this is the case place the secondary jar in lib folder, than make it as plugin.
>
I am unable find out where it is going wrong?? and tired of troubleshooting. Can you assist me ?
put the printstacktrace, so that problem can be identify
sample code
HashMap hash= null;
try{
hash = get map from other class
//class be load at this point, if class is not loaded than you will get exception.
}catch(Throwable t){
// hope you will get some error or exception here
t.printstacktrace();
>
Thanks and Regards
INIYAPaste you sample code, if it couldn't help.

Event Handler on the selectedItem of a ComboBox?

Can you run actionscript as an event handler using the "selectedItem" of a ComboBox? I prefer to do this using the XML file, but at this point I'll entertain any ideas.
Thanks.

Here is what I did to get the ComboBox to act like a menu:
<s:ComboBox
id="msDropDown"dataProvider="
{dropDownListXML.lastResult.milestones.milestone}"x="
10" y="10" width="240" chromeColor="
#CCCCCC" color="#000000"labelField="
name"change="msDropDown_changeHandler(event)"
/>
/////////script section////////////
<![CDATA[
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var dropDownSelection:int = msDropDown.selectedIndex;
if (dropDownSelection == 0){
dropDownLoader.load(
"lessons/EBS_new_Milestone1.swf");}
]]>
I'll use the different index values to run various command - I'll probably convert to a SWITCH to handle 20 to 40 different index choices.

Reg ALV Hyperlink event handling in WDA

Hi,
I am using one ALV for Invoice in WDA. There in that ALV, column containing VBELN has been defined as Hyperlink. On clicking of VBELN, detail about that should be opened up as PDF.
So far, this is working. But, my problem is, if once VBELN has been selected, next clicking does not pass diff VBELN.
I need to know how can I handle clicking on diff VBELN in my Invoice ALV?
If there is anything like clear or refresh, that need to be invoked in Afteraction or Beforeaction or WdModifyView...?
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Kumar Saurav.
Edited by: Kumar Saurav on Feb 5, 2010 8:55 AM

Hi Arjun,
I followed and implemented this line --
In the DISPLAYPDF method, create a parameter ln_vbeln ref to vbeln.
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So, why should I call this method in ON_CLICK Event Handler?
In ON_CLICK Method, this is my code that is being generated using Wizard --
LO_EL_VBRKTAB_2->GET_ATTRIBUTE(
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        NAME = `VBELN`
      IMPORTING
        VALUE = LV_VBELN ).
In addition, I am just firing the Plug to call View that has PDF Container - InteractiveForm Element.
And, DISPLAYPDF is a Method defined in ComponentController Method Tab. There, I am employing the logic to fetch the data using Wizard from diff nodes and processing those to give the output from Smartforms as PDF.
There, I've defined ln_vbeln, but, an error comes stating - ln_vbeln cannot be a table, a reference, a string, or contain any of these objects
Here, my question is I've defined my steps. Let me do it in numbers--
1) View for Input defined
2) View to contain output ALV defined
3) View to contain PDF defined
4) Method ON_CLICK defined in second View
5) Method DISPLAYPDF defined in COMPONENTCONTROLLER's Method Tab
Now, suggest me what to do and where?
Thanks.
Kumar Saurav.

An event handler for several subclasses.

I've been trying to write an event handler that is parameterized by a window
being passed to it. The event handler is intended to handle the exception event
that occurs when the window completes. I have had problems trying to write this.
The scenario is as follows.
I have a task that listens to events that respresent requests for a window being
opened. On receiving these, it starts the window, also as an asynchronous task.
The windows that may be opened (say window classes B, C, and D) are all
subclasses of window class A. The event handler that I register for (after
instantiating the window) takes a window of class A as parameter. It responds to
the exception events for the Display() method of window passed in.
Now the problems I have encountered are as follows :
To allow the event handler to respond to the exception event of a window of
class A, class A has the exception event defined for it. To allow me to start a
window of class B where completion = event, I also have to define the same
exception event. This hides the return and exception for class A. The
implications of this in the event handler is that the event cannot be trapped
unless I cast the parameter passed in into class B on the ' when return_event '
line. This makes the event handler specific to class B.
(This situation is also presumable caused by the fact that each subclasses
overrides the Display method of window class A, and the exception event is
defined for the Display method.)
An alternative approach I tried was using interfaces. I defined the exception
event as an event on an interface. This was defined with the same parameters as
the exception events of classes B, C, and D would have (ie. the exception
event had two parameters - one of type GenericException, and one of ErrorMgr). I
then made classes B, C, and D implement the interface. The event handler
parameter would be the interface rather than class A. However class B would not
compile as the GenericException parameter for the event in the interface uses
the input mechanism, but the GenericException parameter for the exception event
in the display event of classes B, C, and D uses copy input. I have ben unable
to find a way to change the mechanism for event parameters.
Has anybody got any ideas as to how I may be able to achieve the goals of an
event handler that can respond the exception event of a number of subclasses.
Thanks
Steve Elvin
Systems Developer
Frontline Ltd.
UK.
To unsubscribe, email '[email protected]' with
'unsubscribe forte-users' as the body of the message.
Searchable thread archive <URL:http://pinehurst.sageit.com/listarchive/>

Steve,
Try this. Have a method in your super class A , say StubDisplay
which processes the event loop.
Also make this method return Exception and/or completion events you
desire.
Instead of overriding Display() in your sublclasses, override this
StubDisplay method.
You need not have to redefine the exception/completion events in
your sublclasses B,C ..because they naturally inherit from the super class
A.
Using interfaces may not be a good idea in this case because, you
will be forced to implement them in your subclasses even if you dont
need them in some specific cases.
Good luck!
Ajith Kallambella M.
Forte Systems Engineer,
Internationational Business Corporation.
From: [email protected][SMTP:[email protected]]
Reply To: [email protected]
Sent: Wednesday, May 13, 1998 4:42 AM
To: [email protected]
Subject: An event handler for several subclasses.
I've been trying to write an event handler that is parameterized by a
window
being passed to it. The event handler is intended to handle the exception
event
that occurs when the window completes. I have had problems trying to write
this.
The scenario is as follows.
I have a task that listens to events that respresent requests for a window
being
opened. On receiving these, it starts the window, also as an asynchronous
task.
The windows that may be opened (say window classes B, C, and D) are all
subclasses of window class A. The event handler that I register for (after
instantiating the window) takes a window of class A as parameter. It
responds to
the exception events for the Display() method of window passed in.
Now the problems I have encountered are as follows :
To allow the event handler to respond to the exception event of a window
of
class A, class A has the exception event defined for it. To allow me to
start a
window of class B where completion = event, I also have to define the same
exception event. This hides the return and exception for class A. The
implications of this in the event handler is that the event cannot be
trapped
unless I cast the parameter passed in into class B on the ' when
return_event '
line. This makes the event handler specific to class B.
(This situation is also presumable caused by the fact that each subclasses
overrides the Display method of window class A, and the exception event is
defined for the Display method.)
An alternative approach I tried was using interfaces. I defined the
exception
event as an event on an interface. This was defined with the same
parameters as
the exception events of classes B, C, and D would have (ie. the
exception
event had two parameters - one of type GenericException, and one of
ErrorMgr). I
then made classes B, C, and D implement the interface. The event handler
parameter would be the interface rather than class A. However class B
would not
compile as the GenericException parameter for the event in the interface
uses
the input mechanism, but the GenericException parameter for the exception
event
in the display event of classes B, C, and D uses copy input. I have ben
unable
to find a way to change the mechanism for event parameters.
Has anybody got any ideas as to how I may be able to achieve the goals of
an
event handler that can respond the exception event of a number of
subclasses.
Thanks
Steve Elvin
Systems Developer
Frontline Ltd.
UK.
To unsubscribe, email '[email protected]' with
'unsubscribe forte-users' as the body of the message.
Searchable thread archive <URL:http://pinehurst.sageit.com/listarchive/>
To unsubscribe, email '[email protected]' with
'unsubscribe forte-users' as the body of the message.
Searchable thread archive <URL:http://pinehurst.sageit.com/listarchive/>

Opening a new window from an event handler in IC WebUI

Hello ,
I want to open a new browser window on the click of a button (through the event handler) .This can be done using javascript ,but I ideally want it to be triggered from the event handler .The URL is dynamically
generated . Please do let me know if there are ways to achieve this .

Hi,
In the place where you declare your button write this code.
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    lv_string1 = 'javascript:window.open( "'.
    lv_string2 = '" );'.
    ls_button-on_client_click = 'javascript:window.open( "lv_url");'
    CONCATENATE lv_string1
                lv_url
                lv_string2
                INTO lv_string3.
    ls_button-on_client_click = lv_string3.
    ls_button-enabled = abap_true.
    APPEND ls_button TO gt_editbutton.
pass your dynamic URL here to lv_url. Dont Pass anything to ls_button-on_click.
You can do this coding in DO_PREPARE_OUTPUT or IF_BSP_WD_TOOLBAR_CALLBACK~GET_BUTTONS wherever your button is present.
Regards,
Masood Imrani S.

OID resource goes to Disabled Status after running the post process event handler

Hi,
We have an event handler on post update operation. The event handler using the user manager API to do some modification. We are using the "Lock()" function of User Manager API to lock the user based on attribute value. After running the event handler though the user gets locked as expected, it also disables the OID resource after that. We have other resources along with OID but they are not affected with event handler. Only the OID user is triggering the disable operation on locking the user on event handler. We have used the OID 11g Connector for implementation.
If you manually lock the user in user interface it's not going to disable status.
How we can stop to disable the OID User Account.
Thanks

No.If you lock the user in Console it's not going disable status.
Thanks

Event handler Creation in CRM Webclient UI

Hi,
In CRM Webclient UI, we are using service application.
We have enhanced some fileds through eewb.
Few of them are dependent dropdowns. on change of one dropdown other dropdown values needs to be loaded.
To load the values dynamically, In the get_P_XYZ method of the field XYZ , i have raised an event DDLB_ONSELECT.
I am new to bsp applications. I want to generate event handler for this. I tried to create the event handler using the wizard. But i am getting the error - View not copied with wizard; processing not possible.
Please guide me how to create an event handler for the corresponding event or solve the error.
-Chandra Sekhar.

Hi Chandra,
when I have to deal with dependent values I normally do the following:
Raise a Server Side Event in GET_P method as you did
In the GET_V method I build up the value help and store it in a global variable on the context node. In the GET_V you have got access to the current entity with collection_wrapper->get_current() --> meaning you can always have the correct value of all the fields and read dependent on them.
In the implementation class create an event handler that clears the global variable for the dependent value help whenever a new value is selected in the leading field.
I suppose you have got a similar setup.
One possibility to circumvent your problem is to skip the step with the global variable. Just shoot the server side event. This leads to a server roundtrip and the valuehelp for the dependent field is calculated again, based on the updated value of the leading field.
However, this method is not very good for performance! Thus I would normally keep away from it.
Concerning your problem with the wizard. It is correct that you have to have the view created with the wizard to be able to use it later on. On copied views the wizard does some redefinitions of common methods and it does complain if they are not exactly as it expects them.
For event handlers I believe this should only be the DO_HANDLE_EVENT in the parent class of your IMPL. Meaning if you inherit from a SAP view inheritance is as follows: SAP class --> SAP class _IMPL --> Your class --> Your class _IMPL
The DO_HANDLE_EVENT would have to be in the Your class.
An easy way would be recreating the view using the wizard (be sure to restart the component workbench after this).
Another is create the event handler manually. Copy an existing EH_ONXXX method, and add a CASE statement into the DO_HANDLE_EVENT that calls this copied method.
cheers Carsten

Event handling using CAN?

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