Continuously Updating GUI
Hi,
I'm just wondering whats the best way to write a VI that includes two parts: one being an event driven GUI and the second being a continuously updating data display (i.e. temperature displays and graphs)? Would the only way to accomplish this to have both the controls and data collection incorporated in one loop and forget about an event structure? Both controls and data collection is for the same device and each command/query requires sufficient time for the device to process.
No, have the GUI display the data as well as have an event driven "control" part but put the data acquisition in another loop (or better yet another vi). They can communicate through any number of means; functional globals, queues, etc. Search on Producer-Consumer structures, both here (forum) and in the LabVIEW examples in your LabVIEW installation.
Putnam
Certified LabVIEW Developer
Senior Test Engineer
Currently using LV 6.1-LabVIEW 2012, RT8.5
LabVIEW Champion
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My laptop: Toshiba satellite L850-150, Windows 8.1 x64, Intel i7, 8 GB RAM, SSD hard disk.Hi Carlos,
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(paid support) Pacman Update GUI
Below the project description. If you are interested in doing this programming job, please email/pm me.
If there are questions, please reply to this post.
Pacman Update GUI
Archlinux (http://www.archlinux.org/) uses the pacman package manager. A number of GUI applications to control this package manager exist (http://wiki.archlinux.org/index.php/Pac … _Frontends), but none suit our needs.
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Update Manager
The Update Manager must be an application that guides the user through the steps of updating the system with as little effort and as little user interaction as possible. You are expected to first define the minimal amount of steps required, design the application and then implement the application (gui and internals).
There are two possibilities for this applications:
1. You develop it from scratch.
2. You modify the gnome update manager (used in eg ubuntu) to work with pacman.
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Update Applet
The Update Applet provides a systray icon which checks for system updates in regular intervals. The applet should have a tooltip showing the update status, and a context menu with a few options, such as "Check for updates now", "About" and "start Update Manager". You are expected to design and implement the application.I don't get why you should allow your users to update their OS(that is their GUI, their kernel, xorg, libc and other _core_ functionality). These components are already quite "great" and shouldn't need upgrading if that is your worry. Only in the case of some new device coming out and the kernel or xorg need to support it i can see the problem. This should happen very rarely though. I mean, why should you allow your OS to be upgraded by some lowly non-tech users. I don't know of many workplaces which allow their users to upgrade their windows versions for example...
You could always upgrade the OS every X years if needed.
If the boss wants his emplyees to be able to download whichever apps/games they want then ofcourse you could allow this, but this should only be allowed if said apps/games doesn't drag in new versions of xorg, kernel versions or other core functionality or its dependencies.
Just blacklist these in pacman.conf and make the file unwritable for the users...
This way you only need external repo for apps which doesn't install without user intervention.
Here i define "core functionality" as all the code responsible for giving a "working computer" as defined by the boss and you if he's not very IT. If you are worried about security and this is why you want a constantly updating machine then just connect all the machines to a router/firewall before they are allowed onto the net. That one could be an arch machine...
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You know, never underestimate the ingeniousness of an idiot.
Just my 5 cents.
Last edited by test1000 (2010-06-25 00:13:42) -
Continuously Updating Graph Help
Relatively new too labview. What I am looking to do is relatively simple. I have an accelerometer that I would like to aquire data from. I want to Log 5 seconds of data at 100hz. When I use a waveform graph it does not update until the entier loops have finished. I can get a live updating graph if i use a waveform chart, but the time scale is set to system time (HH:MMS). I simply want it to start at 0 seconds and go to 5 seconds. The data does not need to be logged on the graph as I will simply be outputting to a file.
Is there a way to get a continuously updating graph using a waveform graph or is there a way to set up a waveform chart with a time scale that starts at 0 and goes until a defined value (5 seconds)You must use a waveform chart. Not a graph. Goto help in the toolbar, then select Find Examples. Search for chart.
Besides which, my opinion is that Express VIs Carthage must be destroyed deleted
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Hi,
I am updating GUI components in synchronized block which is runinng on main() thread my application hangs, but if I use SwingUtilities.invokeLater(...) then it runs fine.
My question is:
Is it safe to use SwingUtilities.invokeLater(...) in synchronized block.
Edited by: Amol_Parekh on Nov 1, 2007 1:28 AMPaul Hyde in his "Java Thread Programming" (great book!!!) says it is.
With invokeLater() you say to the Thread Scheduler you want that code to run on the Swing thread. In fact, if that is the only thing you do in the synchronized block I think it is unnecessary.
Greetings,
astrognom -
Continuously update time stamp on main panel
Hello,
I am trying to continuously update/show the time stamp based of a fixed starting point. I made a SubVI, to accomplish the task, however, how can I go about using this subVI into a main program? Alternatively, how can I continuously update the timestamp on the main VI?
Any help will be greatly appreciated.
Thanks,
hiNi.
Attachments:
Update timestamp.llb 25 KBWhy you want to read time stamp from Subvi. If you’re not doing anything in subvi (except time) then there is no use. You can simply update your time in Main VI ( as per my previous post).
Please check this VI. I hope this will help you.
Munna
Attachments:
Update timestamp_MOD.llb 31 KB -
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Otmar D. Foehner
Business Development Manager
DIAdem and Test Data Management
National Instruments
Austin, TX - USA
"For an optimist the glass is half full, for a pessimist it's half empty, and for an engineer is twice bigger than necessary." -
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Hello Techies,
How can i update my gui.
My gui is having 2 combo boxes , one text field and one button. when i click on button the request must go to the TCP server and receive the responses from TCPServer.
My problem is that when i first click on Button,the request is going to the TCP and getting reply.
I will get continuous responses from TCP server.
I am getting first response from the server.
Second response I am getting the following error.
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at javax.swing.JComponent.getComponentGraphics(Unknown Source)
at javax.swing.JComponent.paint(Unknown Source)
at javax.swing.JComponent.update(Unknown Source)
at testForSwing1$4.run(testForSwing1.java:475)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)Here is my Code
import java.awt.Component;
import java.awt.Container;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GraphicsConfigTemplate;
import java.awt.GraphicsConfiguration;
import java.awt.Image;
import java.awt.Label;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;
import java.lang.reflect.InvocationTargetException;
import java.net.Socket;
import java.util.ArrayList;
import java.util.List;
import javax.swing.*;
import javax.swing.plaf.ComponentUI;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
public class testForSwing1 extends JPanel implements ActionListener {
public static Socket socket ;
JTextField textField;
JComboBox exchangeComboBox;
JComboBox fieldsComboBox;
JButton button;
public testForSwing1(List List, List )
super();
// TODO Auto-generated constructor stub
JLabel exchLabel = new JLabel("xxxName");
xxxComboBox = new JComboBox(List.toArray());
add(xxxLabel);
add(xxxComboBox);
xxxComboBox.addActionListener(this);
out = outStream;
in = inStream;
JLabel fieldLabel = new JLabel("yyy");
fieldsComboBox = new JComboBox(fieldsList.toArray());
add(fieldLabel);
add(fieldsComboBox);
fieldsComboBox.addActionListener(this);
textField = new JTextField(15);
add(textField);
button = new JButton("clickMe");
button.addActionListener(this);
add(button);
public void actionPerformed(final ActionEvent ae)
final JButton ts = (JButton)ae.getSource();
if ((ae.getActionCommand().equalsIgnoreCase("clickMe"))) {
//try
Runnable tcpConnection = new Runnable()
public void run()
try
out = new DataOutputStream(socket.getOutputStream());
in = new DataInputStream(socket.getInputStream());
out.writeBytes(ram);
out.writeByte('\n');
while(socket.getInputStream()!= null)
System.out.println("echo: " + in.readLine());
update( grap );
catch (IOException ioe) {
System.out.println("IOException"+ioe.getMessage());
SwingUtilities.invokeLater(tcpConnection);
break outt;
* @param args
public static void main(String[] args) {
// TODO Auto-generated method stub
//List list1InMainMethod = new ArrayList();
//List list2InMainMethod = new ArrayList();
try {
File sourceXmlFile = new File(args[0]);
File fidsXmlFile = new File(args[1]);
DocumentBuilderFactory dbFactory = DocumentBuilderFactory
.newInstance();
socket = new Socket("test",90);
createAndShowGUI(xxxFile, yyyFile);
} catch (ParserConfigurationException pce) {
// TODO: handle exception
System.out.println("ParserConfiguration exception"
+ pce.getMessage());
} catch (SAXException saxe) {
// TODO: handle exception
System.out.println("SAXException" + saxe.getMessage());
} catch (IOException ioe) {
// TODO: handle exception
System.out.println("IOExceptionxxxx" + ioe.getMessage());
public static Graphics grap;
public static void createAndShowGUI(List list1InCreateAndShowGUI,
List list2InCreateAndShowGUI,DataOutputStream out,DataInputStream in) {
// Make sure we have nice window decorations.
//try
JFrame.setDefaultLookAndFeelDecorated(true);
// Create and set up the window.
JFrame frame = new JFrame("ComboBoxDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JComponent newContentPane = new testForSwing1(list1InCreateAndShowGUI,
list2InCreateAndShowGUI,out,in);
newContentPane.setOpaque(true); // content panes must be opaque
//grap = newContentPane.getGraphics();
frame.setContentPane(newContentPane);
// Display the window.
frame.pack();
frame.setVisible(true);
}I had posted only GUI coding only..
SwingUtilities.invokeLater(new Runnable()
public void run()
try
out = new DataOutputStream(socket.getOutputStream());
in = new DataInputStream(socket.getInputStream());
//Change
out.writeBytes(s);
out.writeByte('\n');
//change over
while(socket.getInputStream()!= null)
System.out.println("echo: " + in.readLine());
Object c = in.readLine();
update(grap);
catch (IOException ioe) {
// TODO: handle exception
System.out.println("IOException"+ioe.getMessage());
I am getting nullpointer exception in update(grap);
If i dont use this update(grap) my gui is going to block.
How can i solve this problem. Plz guide me. I had stucked here very long time back.
Thanks(Inadvance),
ramu.Hello camie,
The above problem is working fine when i create thread for each request.
when i use nio,instead of threading, the gui is not responding i.e going to be stucked.
I am using nio , since the response from the Server which is appearing in the console is sometimes is machine code, some times some of the characters in the response is missing.
Here is my code.
public class JabberClient1
testForSwing1 tfs1 = new testForSwing1();
public void connect(String s,testForSwing1 tfs,SocketChannel scc,Selector see)throws IOException
SocketChannel sc = scc;
Selector sel = see;
String str = s;
tfs1=tfs;
try
int i = 0;
// Because of the asynchronous nature you do not know
// when reading and writing is done, hence you need to
// keep track of this, boolean written is used to
// alternate between read and write. Whatever is written
// is echoed and should be read.
// boolean done is used to check when to break out of
// the loop
boolean written = false, done = false;
String encoding = System.getProperty("file.encoding");
Charset cs = Charset.forName(encoding);
ByteBuffer buf = ByteBuffer.allocate(1024);
while(!done) {
sel.select();
Iterator it = sel.selectedKeys().iterator();
while(it.hasNext()) {
SelectionKey key = (SelectionKey)it.next();
it.remove();
tfs1.repaint();
sc = (SocketChannel)key.channel();
if(key.isConnectable() && !sc.isConnected()) {
System.out.println("is connected");
InetAddress addr = InetAddress.getByName(null);
if(key.isReadable() ) {
if(sc.read((ByteBuffer)buf.clear()) > 0) {
System.out.println("is reading()");
String response = cs.decode(
(ByteBuffer) buf.flip()).toString();
System.out.print(response);
if(response.indexOf("END") != -1)
done = true;
tfs1.repaint();
if(key.isWritable() &&!written ) {
System.out.println("is writting");
System.out.println("string length"+s.length());
if(i < s.length())
sc.write(ByteBuffer.wrap(new String(s+ '\n').getBytes()));
else if(i == s.length())
sc.write(ByteBuffer.wrap(new String("END\n").getBytes()));
written = true;
tfs1.repaint();
i++;
} finally {
sc.close();
sel.close();
in my testForSwing1.java program
public static void main(String[] args)
sc = SocketChannel.open();
sel = Selector.open();
sc.connect(new InetSocketAddress("localhost", 7890));
sc.configureBlocking(false);
sc.register(sel, SelectionKey.OP_READ |
SelectionKey.OP_WRITE | SelectionKey.OP_CONNECT);
JabberClient1 jc= new JabberClient1();
System.out.println("sxxxxxxx"+s);
try
jc.connect(s,tfs,sc,sel);
catch (IOException e)
System.out.println("ioexception"+e.getMessage());
Second code which i had placed is not complete.
my gui is not respondin when the i want to second request.
plz guide me.....
regards,
ramu. -
J2ME update gui while running MIDlet
Hello all,
I've got a method in my MIDlet which is to show a new form for about 2 seconds and then revert back to the application. It already does all of it's calculations right but it simply does not update the GUI until after the 'return' statement.
Does anybody know why it does not update the GUI before waiting those two seconds and how could I make it do that? Below is my (greatly oversimplified) code.
public int Throwing(int diceResult)
Form fi = new Form( "Dice" );
fi.append("lalala");
getDisplay().setCurrent( fi );
Thread currentThread = Thread.currentThread();
try {
synchronized(this)
System.out.println("waiting");
wait( 2000 );
catch ( InterruptedException ie )
System.out.println("Exception caught");
System.out.println("Returning");
return diceResult;
}What do you mean "the main 'UI' thread continues'. Of course it does. Otherwise your MIDlet becomes unresponsive, as you have seen.
I imagine what you want is something to be done when Throwing() finishes (like setting a new displayable with the results). In that case you have to make that part of the thread that calls Throwing(). Something like this, maybe:
public void run() {
int result = Throwing(5);
Form f = new Form("Results");
f.append("The result is " + result);
getDisplay().setCurrent(f);
}shmoove -
Folks'es,
i have the following problem:
* i have to perform a database query during a drag operation
* the query can take quite some time
* while the query is performed, i would like to show at least some text in my GUI telling the user what happens
* i need to wait for the query to finish before i can continue.
question:
how can I update the GUI while a lengthy, synchronous operation is done on the event thread?
thomas
PS: i know about SwingUtilities.invokeLater() but i can't get it to do what i need (i'm too thick :().I recommend the paintImmediately() method. Here is a
thread that shows it in action:
http://forum.java.sun.com/thread.jsp?forum=57&thread=23
114you're a hero! i must have been blind for the last 4 yrs!
thanx,
thomas
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