Identifying Alt key press event

Hi,
I have a button on the stage/UI on click of which I need to
Lock the PC. I would not want the user to use the keyboard shortcut
'Ctrl + Alt + Del' but instead click the button to Lock the Screen.
I am finding it tough since the Alt key has no Key Code in the
Appendix.
Kindly help me break through.

hii francois
i have tried to go to the page but it givesme the following error
alt="Your browser understands the <APPLET> tag but isn't running the applet, for some reason." Your browser is completely ignoring the <APPLET> tag
can u hlep me with this ??

Similar Messages

Catching Alt Key Press with the Key Down Filter Event

I am writing an application that requires specific key combinations using ctrl, shift, and alt in addition to a function key (F1, F2, F3, etc). The application works great except for when I try to catch an alt key press. The alt key press does not seem to fire an event eventhough it is an option in the PlatMods cluster as well as the VKey enum. When I press the alt key when my application is running the cursor changes to a normal mouse pointer from the usual finger pointer and prevents any other key presses from going through (in addition to not firing an event itself).
I have tried completely removing the run-time menu, which doesn't seem to help. I currently discard all keys after I handle them in my event structure.
I really hope that the only solution isn't using a Windows DLL. Any suggestions or ideas at all would be greatly appreciated.
Thanks,
Ames

Hi Ames
As Kileen has said Khalid has already given you a good solution to detect the ALT key.
I have another approach that might let you stick to your event-driven approach. I suggest that you have another loop in your app that polls the keyboard using the Input Device utility vi's. When this poll loop sees an ALT + KEY combo it raises a dynamic user event and will be processed in your event structure. This means you can keep your key down filter event to process the CTRL + KEY and SHIFT + KEY events.
Example attached in 7.1
cheers
David
Attachments:
Catching Alt Key Press Poll with Events(151551).vi ‏89 KB

Can we fire key press event programmatically????

hi there,
is it possible in java to fire a key press event (of the associated component) programmatically??? like we can fire action event of a button by saying
button.doClick();
thanks in advance.
anshu

You can do so by using awt.Robot.keyPress(), just don't forget to do awt.Robot.keyRelease() afterwards!
Note that it doesn't work for Applets unless you sign them, for security reasons (you don't want to go into a site and have the applet click ctrl+alt+del for you, right?)
Cheers!
Moti

Question about generate key press event to system. help plz.

I am wondering if it is possible to write a java program to generate key press event(not receiving)to the local system so all the other program in the system receive those key press event also. Thanks.

Hi,
:. I don't know what exactly you intend to accomplish. But, I have used the following code in order to simulate keys pressing inside a Java application.
      /* - - - Simulates TAB (java.awt.Event)
      EventQueue evtq = Toolkit.getDefaultToolkit().getSystemEventQueue();
      evtq.postEvent( new KeyEvent(this, KeyEvent.KEY_PRESSED,
                      0, 0, KeyEvent.VK_TAB, KeyEvent.CHAR_UNDEFINED) );
      evtq.postEvent( new KeyEvent(this, KeyEvent.KEY_RELEASED,
                      0, 0, KeyEvent.VK_TAB, KeyEvent.CHAR_UNDEFINED) );
      /* - - - Simulates Shift+TAB (java.awt.Event)
      evtq.postEvent( new KeyEvent(this, KeyEvent.KEY_PRESSED, 0,
                      InputEvent.SHIFT_DOWN_MASK, KeyEvent.VK_TAB,
                      KeyEvent.CHAR_UNDEFINED) );
      evtq.postEvent( new KeyEvent(this, KeyEvent.KEY_RELEASED, 0,
                      InputEvent.SHIFT_DOWN_MASK, KeyEvent.VK_TAB,
                      KeyEvent.CHAR_UNDEFINED) );:. However, as far as I know to send keys to the whole OS you have to create a 'Hook' as described inside Win32API documentation. That's for Microsoft Windows naturaly.
Cheers.
Roque

Unable to receive Tab key press event

Hello,
I have written a component which extends JComponent.
For that , when Tab key is pressed I need to process something.
I have overridden the function processKeyBinding in my class.
But I am not getting any event for tab key press. For all the other key press events, the function is being called.
I also tried to create a action and add it to the action map. But that is also not working.
Can anyone explain me why it is not working and give me the solution.
Thanks in advance,
Anu

public static void removeTabFromFocusTraverval(Component c) {
     int id = KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS;
     Set strokes = c.getFocusTraversalKeys(id);
     Set newStrokes = new HashSet(strokes);
     newStrokes.remove(KeyStroke.getKeyStroke("TAB"));
     c.setFocusTraversalKeys(id, newStrokes);
}

How to binding a key press event of "Esc" to "cancle" button

I create a class extended JComponent. Than I add a button named "cancle " to it.
Than I add the class's instance to a JDialog object.
I try to get the key press event through add a keyListener to the class instance, but no works.
I try to add a keymap and action map to the dialog 's getRootPane() also no works.
Who can tell me how can I do?

Thats the way I did it:
    // map escape key
    ActionListener escapeActionListener = new ActionListener()
      public void actionPerformed(ActionEvent e)
        cancelPressed();
    this.registerKeyboardAction( escapeActionListener,
                                 KeyStroke.getKeyStroke(KeyEvent.VK_ESCAPE, 0, false),
                                 JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT );

Raise Key pressed event

Hello, any know how can I raise a key press event throw code. For example I want to simulate that the user has press the A Key. How can I do that throw code?
Thanks a lot !!

Hi there,
Your question has been discussed previously in the forums. Sounds like you want to programmatically click a button in WPF.
Please check out this post
http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=1329603&SiteID=1
Thanks,
Jennifer

How to detect space key pressed event

I am working on a japplet where it is needed to pause the applet on the occurrence of a space bar key pressed event can anybody help
thanks in advance

Have a look at the tutorial:
http://java.sun.com/docs/books/tutorial/uiswing/events/keylistener.html
http://java.sun.com/docs/books/tutorial/uiswing/misc/keybinding.html
-Puce

How to handle form close event or escape key press event for user defined f

Experts,
Please let me know how to handle form close event or escape key press event for user defined form...
Thanks & Regards,
Pravin.

Hi
You can catch the form close event like this
If ((pVal.FormType = 139 And (pVal.EventType = SAPbouiCOM.BoEventTypes.et_FORM_CLOSE)) And (pVal.Before_Action = True)) Then
      Try
               SBO_Application.SetStatusBarMessage(pVal.EventType.ToString())
      Catch ex As Exception
                SBO_Application.SetStatusBarMessage(ex.Message)
        End Try
      End If
Hope this helps
Regards
Arun

SUPER/WIN KEY remain pressed (was: alt key pressed)

While using the pc it always happen that the alt key remain pressed... so I'm not able to do action like write in a chat window. I wasn't able to find any particular errors in xorg logs. The programs I always use are kdemod 3.9, amarok, firefox 3 beta5, emesene, konqueror. What can I do??
Last edited by Raffo (2008-05-09 10:49:03)

My xorg.conf version is X.Org X Server 1.4.0.90. From 2 days I'm not experiencing this problem but I have to say that I'm not using the computer so much. I'll do better tests tomorrow. Here's my xorg.conf file:
Section "ServerLayout"
Identifier "Layout0"
Screen 0 "Screen0" 0 0
InputDevice "Keyboard0" "CoreKeyboard"
InputDevice "Mouse0" "CorePointer"
EndSection
Section "Files"
RgbPath "/usr/lib/X11/rgb"
EndSection
Section "Module"
Load "dbe"
Load "extmod"
Load "type1"
Load "freetype"
Load "glx"
EndSection
Section "InputDevice"
# generated from default
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "auto"
Option "Device" "/dev/input/mice"
Option "Emulate3Buttons" "no"
Option "ZAxisMapping" "4 5"
EndSection
Section "InputDevice"
# generated from default
Identifier "Keyboard0"
Driver "kbd"
EndSection
Section "Monitor"
Identifier "Monitor0"
VendorName "Unknown"
ModelName "Unknown"
HorizSync 30.0 - 81.0
VertRefresh 56.0 - 75.0
Option "DPMS"
EndSection
Section "Device"
Identifier "Device0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
EndSection
Section "Screen"
Identifier "Screen0"
Device "Device0"
Monitor "Monitor0"
DefaultDepth 24
Option "RenderAccel" "True"
Option "AllowGLXWithComposite" "True"
Option "AddARGBGLXVisuals" "True"
SubSection "Display"
Depth 24
Modes "1680x1050" "1280x1024" "1024x768" "800x600" "640x480"
EndSubSection
EndSection
Section "Extensions"
Option "Composite" "Enable"
EndSection
@hacosta: I don't know what kmilo is...

Key pressed event

I need message to be displayed when certain key pressed. Why it's not working?
import java.awt.*;
import java.awt.event.*;
import javax.swing.event.*;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class TestKey extends JPanel implements KeyListener {
     public TestKey(){
          addKeyListener(this);
     public static void main(String arg[]){
           JFrame frame = new JFrame();
              frame.setTitle("Test my keybord, man!");
              frame.setSize(300, 200);
              frame.addWindowListener(new WindowAdapter() {
                public void windowClosing(WindowEvent e) {
                  System.exit(0);
              Container contentPane = frame.getContentPane();
              contentPane.add(new TestKey());
              frame.setVisible(true);
     public void keyPressed(KeyEvent ke){
          System.out.println("key pressed");
     public void keyTyped(KeyEvent ke){
          System.out.println("key typed");
     public void keyReleased(KeyEvent ke){
          System.out.println("key released");
}

public TestKey(){
    setFocusable(true);//<----------
    addKeyListener(this);
}

How to change a h:outputText value in the current form on key pressed event

Hello Suners,
Greetings! I'm developing my first JSF web application and i'm trying to figure a way out to change outputText value when key pressed on another inputText so that when the user is typing his name for example he can see the letters showing respectively in the outputText.
I managed to do it onchange but the user must focus out of the inputText to see his name in the outputText which is not right and the form must submit onchange event which is annoying.
<h:inputText value="#{login.username}" title="name" id="name" required="true" onchange="this.form.submit()" >
                            <f:validateLength maximum="10" minimum="1"/>
                            <f:validator validatorId="myValidator"/>
                            <f:valueChangeListener type="classes.MyListener"/>
</h:inputText>Is there any listener i can associate with the "onkeypress" attribute? Can anyone help me to do that with JSF?
King Regards,

hi, with JSF 2 you got the ajax tag, just tried it and it works fine :)
<h:inputText id="myinput" value="#{back.name}">
    <f:ajax execute="@this" event="keyup" render="outtext"/>
</h:inputText>
<h:outputText id="outtext" value="#{back.name}"/>or before JSF 2
<h:outputScript name="jsf.js" library="javax.faces" target="head"/>
<h:inputText id="myinput" value="#{back.name}" onkeyup="jsf.ajax.request(this, event, {render: 'outtext'}); return false;"/>
<h:outputText id="outtext" value="#{back.name}"/>The name property is a simple String in the bean.
Hope this helps
Edited by: hereps on Aug 21, 2010 7:18 AM

How to detect it left side Alt or right side Alt key pressed?

Hi,
I want to know if there is a way to detect whether it is the alt key on the left of the keyboard pressed or it is the alt key on the right side of the keyboard pressed. I don't want to use JNI stuff. Is there a 100% Java solution to it?
Thanks

I've seen bug reports regarding this issue, and it is stated as fixed, but I don't know for which release of the jdk. So far, I think you can't distinguish between left and right alt/shift/ctrl..

Key Press Event

I have been pouring through the TLF API docs looking for
events to handle key presses on a TextFlow and I am not finding
anything. I'm sure it's simple, can anyone give me a clue? I'm
looking to detect Ctrl+B, Ctrl+I, etc.. to trigger formatting.

The events go to the DisplayObjectContainerController. You
will want to override the processKey event functions to add special
handling. Those are in the protected methods section and are
inherited from a base class.

Capture key press events with ExtendScript?

Is it possible to do this? I can't find an example in the documentation or online anywhere. I'd really like to know when the user presses the arrow keys while viewing the slideshow in Bridge.
Thanks!

Thanks for the example Paul. I can see how to listen to key down events on Windows and Dialogs that I create. Do you know of way to listen for global (app-wide) key down events? These are not defined:
app.addEventListener('keydown',...)
app.document.addEventListener('keydown',...)
I'm trying to add to the slideshow mode by having a little palette dialog with the context information shown that I need. The default caption box doesn't have what our artists want. If the palette window is in focus, I get the keydown event, but if they're using the arrow keys to flip through the slideshow, I can't capture those.
Thanks for the help.

Identifying Alt key press event

Similar Messages

Maybe you are looking for