Handling event from background ?

I like to listen and handle KeyEvent which is occured
during my application is in background or deiconized.
Is it possible ? How can I do that?
Please...give me some advice !

KeyEvents will only be processed by your app when it's in the foreground. If you need to capture keyEvents everywhere, you would need to use JNI and write c/c++ code implementing a KeyHook

Similar Messages

How to Handle events from audioplayer by ADF ObjectMedia Component

Hi,
In My application Having a ADF ObjectMedia Component for the audio play,
My requirement is to handle the events from the Player,i.e Need to get an
event when the user pause the player,can i get the event in backing bean.or else please help me in any other way to get the requirement asap.
Thanking you....

Hi,
assume the media player most likely is a browser plugin. Question: Does the media plugin raise events ?
If the media player has a JavaScript API that allows you to call a JavaScript function then you found a gate open to publish the event to the JSF application
So as a todo for you: Check with the media player vendor if there exist a JavAScript API or any other sort of eventing.
Frank

Listening for keyPressed events from background?

Is it possible to have a java program running in the background and listen for keyPressed events? I would like for the program to listen for certain keys to be pressed and when they are manipulate the mouse. From what I've looked at so far however it seems the listening component must have focus. Thanks.

On any OS that would typically involve hooking into the OS itself.
And then manipulating OS resources as well.
Putting an app into the 'background' is also OS specific.
Given that the above is all you want to do then java is not an appropriate language choice. C++ would be better.

How to handle event from subVI in the main VI?

Hello,
I'm doing some measurement. During the measurement I want the user to see some activity dialog - that's easy to do. Before the measurement starts I dynamically run VI (EX_Progress.vi) that shows some activity and then I do the measurement (in my example simulated by random number generation) . After the measurement is done (or error occurs) I can dynamically abort the activity indicator. But on the other hand I want to give to the user chance to abort the measurement manually via the activity dialog by STOP button. There are some ways how to do it via global variable and check every iteration in the main VI it's state but isn't there some better way? Would be nice to run event in the main VI when the user pushes the STOP button in the Progress VI. Is it possible to achieve this using register events? I tried but don't really now how I'm not familiar with this technique.
Thanks in advance
Message Edited by ceties on 11-26-2007 01:34 PM
LV 2011, Win7
Attachments:
Ex.zip ‏374 KB

OK, here's an example using User Events. It doesn't directly have the main VI listen for the Button press event in the subVI. Instead, it has the main VI listen for a custom User Event that the subVI fires every time there's a button press. You could theoretically directly listen to the button press directly from the Main VI, but you would have to somehow get that control's reference to the main VI. That would require storing a copy of it in a global or some such method. This method I will show here is very common and is definitely worth learning.
For more info on User Events, refer to the LabVIEW help. You can learn more by clicking any of the User Event VIs and selecting Help from the shortcut menu.
(I didn't set the subVIs front panel to open automatically, so you'll have to do that yourself to see anything from this demo...)
Message Edited by Jarrod S. on 11-26-2007 02:51 PM
Jarrod S.
National Instruments
Attachments:
Example.zip ‏25 KB

Handling events from native objects in Java code - Code from Sachin Agrawal

Hi All,
I�ve been studing this example in http://www.ibm.com/developerworks/java/library/j-jniobs/ , so I find it so interesting to be used on programs, but I'm just a starter programmer when we talk about JNI.
I hope that some good soul will tell me how I use it in java.
Let me explain better.
In this example, a main.exe it's the reponsible to call the entire program, java and C. I want to use this code, but, In java. Or better, I wanna know what I have to change, to call it from my Java code...
for example, I've tryed this:
package events;
import javax.swing.JFrame;
public class MouseDownListener extends JFrame implements IJMouseDownListener {
     EventSourceProxy _proxy;
     IJMouseDownListener _listener;
     public MouseDownListener(int handleEventSource) {
          _proxy = EventSourceProxy.get(handleEventSource);
          if (null == _proxy) {
               return;
          _listener = new IJMouseDownListener() {
               public void onMouseDown(int hPos, int vPos) {
                    System.out.println("In MouseDownListener.onMouseDown");
                    System.out.println("     X = " + String.valueOf(hPos));
                    System.out.println("     Y = " + String.valueOf(vPos));
          _proxy.addMouseDownListener(_listener);
     public void release() {
          _proxy.removeMouseDownListener(_listener);
          _listener = null;
          _proxy = null;
         public void onMouseDown(int x, int y){
        System.out.println(x + "-" +y );
     public static void main(String[] argv) {
          MouseDownListener listener = new MouseDownListener(0);
                listener.setVisible(true);
}but doesn�t work.
Thanks for your help!

Jschell Hello,
I really think that I was not very clear in my question.
Sorry about my very bad English.
In the example linked, there is a file main.cpp that starts the program:
// Defines the entry point
#include "EventSource.h"
#include "MouseDownListener.h"
#include "Jvm.h"
#include <process.h>
#include <windows.h>
void __cdecl ThreadMain(void * pSource)
     ((CEventSource *)pSource)->fireMouseDownEvent(50, 100);
     CJvm::DetachThread();
int main(int argc, char* argv[])
     CEventSource eventSource;
     CMouseDownListener listener;
     eventSource.addMouseDownListener(&listener);
     CJvm::CreateJVM(argc-1, &argv[1]);
     jobject jobj = CJvm::CreateJavaObject("events/MouseDownListener", (int)(IEventSource *)&eventSource);
     _beginthread(ThreadMain, 0, &eventSource);
     Sleep(2000);
     CJvm::ReleaseJObject(jobj);
     CJvm::DestroyJVM();
     return 0;
}And the command line to execute all the thing is
main.exe "-Djava.class.path=.\\java\\bin"
"-Djava.library.path=.\\cpp\\listener\\Debug"and the result in a dos prompt is:
In CMouseDownListener::onMouseDown
X = 50
Y = 100
In MouseDownListener.onMouseDown
X = 50
Y = 100
According to the example, this code main.cpp, calls the Java classes too:
EventSourceProxy.java, IJMouseDownListener.java, MouseDownListener.java.
But, I want to modify it so that I can start my program directly from within Java in a way that I start the program with something like
"Main java," plus the required parameters, and can thus manipulate the results obtained through the java.
In short, I wanted to translate the main.cpp for Java, so I have a main class in Java that start the program, call the listener.dll through JNI, take the position of the mouse, and return to my program in Java.
If you or someone else can help me,'ll be very grateful.
Tkd,
Dino

Parent frame handling events from a child frame

Hello, I'm making an app where i have a frame ("A" frame where A is a JFrame extended class) with a Button, nothing more nothing less, and, inside the mouseclick event I create an instance of another frame ("B" frame, created just by the common sentence B screenB = new B(); where B is a JFrame extended class) that it has, exactly like the parent, a Button but this has a different behavior, when i click the button of the "B" frame (Child) it's supposedly have to change the text of the button in "A" frame (Parent). In other words, an event in a child frame have to make changes in the parent frame, or the parent have to listen to events of the child to make any changes at the moment it happened, or whatever, what you understand the best for this.
And another thing, in some apps you have a screen to fill some fields, and when you click a button or something, sometimes it appears another screen, let's say it has more fields, but that screen is now on the top of the screens and unless you close it or click a Ok button for say something, it denies you to do anything on the parent screen or another screen, like that are disabled or something. This is a property included in Frames, or it has to be imaginated and coded in java?
Hope you can help me.

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class ListeningToChildren implements ActionListener {
    JLabel label;
    JFrame child;
    public void actionPerformed(ActionEvent e) {
        if(child == null)
            launchChild();
        else
            child.toFront();
    private void launchParent() {
        JButton button = new JButton("launch child");
        button.addActionListener(this);
        JPanel panel = new JPanel();
        panel.add(button);
        label = new JLabel("count = 0");
        label.setHorizontalAlignment(JLabel.CENTER);
        JFrame f = getFrame("Parent", new Point(200,200));
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.getContentPane().add(panel, "First");
        f.getContentPane().add(label);
        f.setVisible(true);
    private void launchChild() {
        JButton toParent = new JButton("talk to parent");
        toParent.addActionListener(listener);
        JButton openDialog = new JButton("open dialog");
        openDialog.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String s = "<html><font color=blue size=8>" +
                           "Hello World</font></html>";
                JLabel msg = new JLabel(s, JLabel.CENTER);
                JOptionPane.showMessageDialog(child, msg, "modal dialog",
                                              JOptionPane.PLAIN_MESSAGE);
        JPanel north = new JPanel();
        north.add(toParent);
        JPanel south = new JPanel();
        south.add(openDialog);
        child = getFrame("Child", new Point(450,200));
        child.addWindowListener(disposer);
        child.getContentPane().add(north, "First");
        child.getContentPane().add(south, "Last");
        child.setVisible(true);
    private JFrame getFrame(String title, Point loc) {
        JFrame f = new JFrame(title);
        f.setSize(200,150);
        f.setLocation(loc);
        return f;
    private ActionListener listener = new ActionListener() {
        int count = 0;
        public void actionPerformed(ActionEvent e) {
            label.setText("count = " + ++count);
    private WindowListener disposer = new WindowAdapter() {
        public void windowClosing(WindowEvent e) {
            child.dispose();
            child = null;
    public static void main(String[] args) {
        new ListeningToChildren().launchParent();
}

Events from C# Control ? Urgent !!

Hi all,
    Is there any way to handle events from a C# customcontrol in ABAP?
    When I used ActiveX controls, it was easy - just check by EventID in DISPATCH, and RAISE EVENT that would then be handled...
    But now, with C# controls, events are "delegate" functions, and I just can't figure out how to make ABAP subscribe to this tricky kind of event...
    Please, help!!!
Thanks,
Arnaldo.

This article will explain how to declare and use the C# events in your application as Event Control. You can design your event control in couple of mints, making your event as control will be easy for GUI developers to implement events in client side.
Here are the steps:
Create one Windows Application Project
Add Component Class using "Add New Item". This is going to be your Event Control.
Declare your delegate in your Event Control under your namespace
Now declare your event inside your Event Control class.
Also add the FireTheEvent method to fire the event.
Build the project.
Go to Form, then ToolBox, add the Event Control using Add/Remove Items menu by right clicking on the tool box.
Drag and drop the new control. Using the property window of the control you can easily implement the Event method in your application.
Call The FireTheEvent method in your button click after adding new button to your form.
Run the application and click on your button, you should see your Event firing.
Here's a list of all the events for the DataGrid control:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfSystemWebUIWebControlsDataGridEventsTopic.asp.
After referring to the DataGrid Event Handler (http://msdn.microsoft.com/library/en-us/cpref/html/frlrfsystemwebuiwebcontrolsdatagriditemeventhandlerclasstopic.asp) information, I think you'll want your code to look something like this:
<%@ Page Language="C#" AutoEventWireup="True" %>
<%@ Import Namespace="System.Data" %>
<script language="C#" runat="server">
void Page_Load(Object sender, EventArgs e)
// Set things up...
void Item_Data_Bound(Object sender, DataGridItemEventArgs e)
// Your event code
</script>

Run Crystal Reports in background on event from asp

How would I run a Crystal Report file in the background after an onClick event from an ASP web page?
Are there any code samples of how this can be configured?
I have Crystal Reports Server 2008 and Crystal Reports 2008.

See if the solution in [this|Re: CR2010 Production Release; thread will help.
Ludek
Follow us on Twitter http://twitter.com/SAPCRNetSup
Got Enhancement ideas? Try the [SAP Idea Place|https://ideas.sap.com/community/products_and_solutions/crystalreports]

Triggering background job event from Unix script

Hi all,
I am having one question regarding triggering of background job in SAP using Events from Unix script. Is this possible? If so, can anyboy provide some sample code related to Unix script and how do we communicate to SAP from Unix system. Actually, here the backend of R/3 system is MSSQL. I am having a program in R/3 system which is scheduled as a background job based upon event trigger. I want to trigger that even from the unix script.
Appreciate for your help in advance.
Thanks,
Adithya K

Hi,
Check if this can help you
http://help.sap.com/saphelp_sm32/helpdata/en/fa/096e6b543b11d1898e0000e8322d00/content.htm
Regards,
Atish

Dispatch custom event from itemClick handler

hi,
I'm trying to dispatch a custom event from my itemClick handler.
So when I click on an item of my datagrid, I want to send a custom event.
private function dataGridItemClickHandler( event:ListEvent): void
dispatchEvent( new myEvent( myEvent.NEW, values[event.columnIndex]["name"]) );
<mx:DataGrid dataProvider="{values}" itemClick="dataGridItemClickHandler(event)">
</mx:DataGrid>
but this code doesn't work.
Can you help me
thanks
best regards

Please see that you override the function clone() and return the new function.If that is correct.you can call the super() method to initialize your base class.
If your custom event {myEvent} is in package say: CustomEvent,
1)import package CustomEvent.myEvent
2) keep in <mx:metadata>[Event(name="NEW", type="CustomEvent.myEvent")]</mx:metadata>.. name suggest what type of event you want
3)Create an itemclick listener and in dataGridItemClickHandler
private function dataGridItemClickHandler( event:ListEvent): void
dispatchEvent( new myEvent( ' NEW ', values[event.columnIndex]["name"]) );
private funcation myEventListener(evt:myEvent):void
//Put your logic
4)Use this event by name NEW="myEventListener(event)" this will behave as event type in the datagrid tag like click, hover and others.
Hope this helps! Please excuse if anything is logically incorrect.Do point out.Thanks.

Handling SAP Events from CPS

Hello ,
is there anyway can we handle SAP events from CPS , our scenario is if we schedule a job in SAP from CPS , the job in SAP is firing an SAP event based job , how can we get the status of event based job from SAP to CPS.
Regards
Raghu

Hi Raghu,
There are a few options here.
You could monitor the SAP event based job in CPS, to see the status.
You could also create the SAP event based job from CPS, then it is automatically monitored.
The best would be to verify if you can simply put the two jobs in a CPS job chain. If the second job only waits for the event and does not do anything with the message of the event, this should be very easy. If the ABAP programs involved are custom developments, you could remove the event dependency and replace it with a CPS job chain too.
Regards,
Anton.

Handle Portlet event from portal.

Hi all,
I wander that we can handle a event is issued by portlet in the portal?
Example: when I click a command-Link on the portlet, then portal can catch some info of this action I did in the portlet.
Do you have any idea about it?
Thanks a lot!
Edited by: AS84 on Oct 26, 2012 8:26 AM

Hi again.
I'm busy at the moment but you have to follow this steps:
As Producer side (your Portlet):
- Click on your ADF Component (CommandLink or CommandButton) that you want to generate an event.
- In Properties Inspector you'll see "Contextual Events" pane. Select in "+" and add new Event.
As Consumer side (your portal page):
- Generate a class called EventCosumer or something similar to handle events.
- Create a method to handle your event: For example
   * Metodo manejador del boton pulsado
   * @param customPayLoad El texto del boton pulsado
public void handleButtonEvent(DCBindingContainerValueChangeEvent or String customPayLoad) { // It depends of the payload of you want to share
    // Take that you want of value passed
}- Generate a DataControl from your EventConsumer Java (Right click -> Generate Data Control).
- Create a methodAction binding in your pageDef.
- In your pageDef in Contextual Events tabs, subscribe your pageDef to the event generated by EventConsumer.
This is basically the steps to do all programmatically. Remember that you can subscribe and consume payLoad values in Runtime too :).
Regards.
Reference links:
- My own blog entry (Spanish): http://www.danielmerchanoracle.blogspot.com.es/2012/05/adf-11g-eventos-contextuales.html
- Frank Nimphius ADF sample about Contextual Events: http://www.oracle.com/technetwork/issue-archive/2011/11-may/o31adf-352561.html
- Yannick Ongena Blog entry: http://yonaweb.be/inter_component_communication_between_taskflows_adf_and_webcenter
Edited by: Daniel Merchán on 29-oct-2012 10:43

[svn:fx-trunk] 9385: SkinnableTextBase. as - remove code to redispatch UPDATE_COMPLETE event from RET.

Revision: 9385
Author:   [email protected]
Date:     2009-08-19 08:54:55 -0700 (Wed, 19 Aug 2009)
Log Message:
SkinnableTextBase.as - remove code to redispatch UPDATE_COMPLETE event from RET. For each property setter, even though they are just proxies to RET, call invalidateProperties() to generate UPDATE_COMPLETE events and add handler for the TextOperationEvent.CHANGE and call invalidateDisplayList() to generate UPDATE_COMPLETE events for RET size and display list changes. SDK-22705
TextArea.as - remove code to set scroller horizontalScrollPosition to off if "toFit". Need to do it "virtually" rather than actually change the scroller property. SDK-22680
RichEditableText.as
Changes to rememasureText() and measure() since not all combinations of constrainted width/height worked correctly, particularly if auto sizing. SDK-22727
Changes to textContainerManager_compositionCompleteHandler() to try to keep "contentWidth" seen by scroller constant if lineBreak="toFit" so the scroller doesn't think it needs to add a horizontal scroll bar. If the text is "toFit" there should never be a hsb. SDK-22680
Change to updateDisplayList() to scroll after updating the container if it was delayed when EditManager.updateAllContainers() last ran. SDK-22705
Removed default params from scrollToRange() since they don't make sense. SDK-22696.
Some cleanup based on TLF cleanup.
RichEditableTextContainerManager.as - in drawBackgroundAndSetScrollRect(), if auto sizing, should use the display list width and height for the scroll rect and background for the text rather than the content width and height.   SDK-22727 and SDK-22678 ended up fixed too.
RichEditableTextEditManager.as - flag to know if scroll is needed after updating the container in updateDisplayList. SDK-22696
QE notes: be sure to make automated tests for SDK-22727, SDK-22705, SDK-22678 please
Doc notes:
Bugs: SDK-22727, SDK-22626, SDK-22680, SDK-22705, SDK-22696, SDK-22678
Reviewer: Gordon
Tests run: basictests, checkintests, TextArea, TextInput, NumericSteeper
Is noteworthy for integration: no
Ticket Links:
    http://bugs.adobe.com/jira/browse/SDK-22705
    http://bugs.adobe.com/jira/browse/SDK-22680
    http://bugs.adobe.com/jira/browse/SDK-22727
    http://bugs.adobe.com/jira/browse/SDK-22680
    http://bugs.adobe.com/jira/browse/SDK-22705
    http://bugs.adobe.com/jira/browse/SDK-22696
    http://bugs.adobe.com/jira/browse/SDK-22727
    http://bugs.adobe.com/jira/browse/SDK-22678
    http://bugs.adobe.com/jira/browse/SDK-22696
    http://bugs.adobe.com/jira/browse/SDK-22727
    http://bugs.adobe.com/jira/browse/SDK-22705
    http://bugs.adobe.com/jira/browse/SDK-22678
    http://bugs.adobe.com/jira/browse/SDK-22727
    http://bugs.adobe.com/jira/browse/SDK-22626
    http://bugs.adobe.com/jira/browse/SDK-22680
    http://bugs.adobe.com/jira/browse/SDK-22705
    http://bugs.adobe.com/jira/browse/SDK-22696
    http://bugs.adobe.com/jira/browse/SDK-22678
Modified Paths:
    flex/sdk/trunk/frameworks/projects/spark/src/spark/components/TextArea.as
    flex/sdk/trunk/frameworks/projects/spark/src/spark/components/supportClasses/SkinnableTex tBase.as
    flex/sdk/trunk/frameworks/projects/spark/src/spark/primitives/RichEditableText.as
    flex/sdk/trunk/frameworks/projects/spark/src/spark/primitives/supportClasses/RichEditable TextContainerManager.as
    flex/sdk/trunk/frameworks/projects/spark/src/spark/primitives/supportClasses/RichEditable TextEditManager.as

Potomac wrote:
check these bugreports :
https://bugs.archlinux.org/task/42505
https://bugs.archlinux.org/task/42353
it seems that this bug related to i915 chip ( or intel graphic card ) is fixed in kernel 3.18rc3 mainline ( we can find this kernel package in AUR )
there is also another and complete different bug when we use a kernel 3.17 and even 3.18 ( it's a random bug ) but with a similar effect : boot can hang ( the boot process suddenly stops ) :
https://bbs.archlinux.org/viewtopic.php?id=189622
https://bbs.archlinux.org/viewtopic.php?id=189324
downgrading to kernel 3.16.x is the workaround
I assume my computer is affected by one of these bugs. While I can get to the point where my window manager is loaded, everything almost immediately hangs (but doesn't freeze). Terminal windows become non-responsive and Chromium will refuse input. It's very weird. This happens with both of the 3.17 kernel updates but not in any of the 3.16 releases (including 3.16.7).
This is on an AMD system (cpu/gpu w/ open source driver). Overall 3.17 seems rather buggy.

How to handle events in Swng

Hi!
I would like to know which one of the following is the best way to handle events in Swing application.
Method 1
Write annonymus inner classes in the same class
Method 2
=======
Write a seperate class which extends the adapter class of the event handling and create an object of that in the main class and assign it to the components with addActionHandler() method.
I am trying to use the second one and I have the following design issue.
I have a class frmMain.java in which I have a frame and to that frame I am adding a panel which consists of 'N' No. of components.
I want to make this panel added to the frame when I click on a menu item (login) and want to remove the panel from frame when I click on a menu item(logout).
I have a main class called Application.java where I create the object of my frame(frmMain.java).
Thanks in advance,
AV

1. Your JFrame is now subject to receive action events from anywhere. You will have to be more careful that you respond only to the right events.
2. If you have a lot of possible consequences to an event(for example, based on button pressed), you'll need a long if...then...else statement to determine what to do based on the source of the event.
3. With individual ActionListener classes, it's easier to add the same listener to multiple components and no need to worry about source.
4. Kind of the same thing: With individual classes, the event and its consequences are so tightly coupled.
End preaching....basically, my style boils down to what I call the tool set vs Swiss army knife rule. Java seems designed around the concept of a large number of specific purpose classes vs a smaller number of multi purpose classes and I think its a design methodology that makes sense, because I believe strongly in functional isolation in my code.

Need Suggestion on handling events

I have 2 caches . The 1st cache is populated with more than million records .The 2nd cache has a real time feed populating the cache and updating it quite frequently . I have a requirement of doing some calculation on 1st cache based on updates happening in 2nd cache.
What is best way to handle the events happening on 2nd cache? Should i use backing map listeners or handle the event from client side and run a entry processor to do the calculations on Cache1 ?

Use an EntryProcessor on Cache1 (positions) to perform the updates to Position objects. Position calculations are usually pretty simple, so the use of an EP is probably fine. You'll want to gather the list of target position keys before doing the invokeAll() call, so all the affected Positions are updated in parallel.
As to how you trigger the EP, a listener on cache1 would be one approach. Make sure the caches are running on separate services to avoid re-entrancy issues.
We use the EP approach for our Position updates and find we can process many tens of thousands / second using EPs.
You'll probably also want to re-use the above ideas in order to maintain an audit trail, as this would normally be in a separate cache (i.e. not in the Positions cache) and written-behind to a db.
If your price-change notifications are so frequent that they exceed your ability to process them (even using invokeAll on EPs), then you might want to look at some form of async processing. The CommandPattern in the Incubator is one such example; of course you could also roll your own.
Cheers,
Steve

Handling event from background ?

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