Pausing execution of a VI
Hello, I am fairly new to LabView. For the VI I am writing, I would like it to pause at a certain point, wait for the user to click a button (which is wired to a case structure), and then continue execution based on the case that was selected. I'm not sure how to do this. Does anyone have any advice?
Thanks!
Solved!
Go to Solution.
Everything is do-able...
Have a look at the attached example for a sample solution using radio buttons.
There are many ways of creating a solution. You need to define more what you want.
R
Attachments:
SelectTrueFalse.vi 24 KB
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I have a slight issue using the scripts section of the web inspector, namely it doesn't pause execution on setting a breakpoint on a line number in the gutter.
Can someone suggest a fix?
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See if anything here helps. http://www.qtweb.net/pages/ibr9600.html
Carolyn -
Hello!! I want to pause my execution after a message ("display message to the user" function) and enter some data (in many fields) on the front panel. After that i need some other messages to be displayed. How can i pause,enter that data (with paused execution) between these messages;; Thanks a lot!!!
Here is a simple Dialog vi that takes in the instructions and displays it in the Title box on the front panel. The user then enters information in the string box. Then the user clicks OK. If you put this vi into your code, it will pause the program until the OK button is pressed. The Dialog VI will pop up, then go away once the OK is pressed, then your code will continue. Actually, you should add error in and out to the Dialog VI so that you could cause the proper execution flow.
Modify it to your needs. Instead of a string, put in whatever data type you need. You can set the key focus to the box where the user will start typing, then he won't have to click in the box first. I've made this VI very crude so that you can practice making it better. Change the icon to something more suitable.
- tbob
Inventor of the WORM Global
Attachments:
Dialog.vi 8 KB -
Pausing execution in a program.
I'm developing a GUI for a game called Pig, where players take turns rolling the dice and accumulating points. I have made the computer players automatically keep rolling until they can no longer roll (if they happen to roll a 1 or have 20 more points than a human player). Here is my code for the computer:
if (comp) {
while (!pass) {
if (computerScore+roundScore>=humanScores+TURNOVER) {
status = name+" has turned over the dice by default.";
update();
JOptionPane.showMessageDialog(null, status);
status = " ";
pass=true;
} else {
rollDice();
update();
/*try {
Thread.sleep(1000);
catch (InterruptedException e) {
e.printStackTrace();
//I want to use a Timer here, instead of JOptionPane.
JOptionPane.showMessageDialog(null, name+" has rolled: "+toString());
if (losePoints()) {
JOptionPane.showMessageDialog(null, name+" got too ambitious and rolled snake eyes!\n"+name+" lost all points.");
} else
if (loseRound()) {
JOptionPane.showMessageDialog(null, name+" got too ambitious and rolled a one!\n"+name+" lost all points for this round.");
} else
roundScore += points;
if (computerScore+roundScore>=GOAL) {
computerScore += roundScore;
status = name+" has won the game!";
pass=true;
end=true;
update();
}As you can see, I've already tried pausing with a Thread.sleep(delay) function. I have found that the only thing that works is using a JOptionPane to stop execution. The problem with the Thread.sleep() is that the drawing of the GUI stops working while the computer never stops (I want it to pause between each time it rolls the dice) taking turns to roll its dice (until it passes).
Everything works perfectly with a JOptionPane, but I don't want to display what the computer rolls each time (because the update() method takes care of that already). Here is the code for my update() method:
public void update() {
turnLabel.setText("Player: "+name);
roundScoreLabel.setText("Score for this round: "+roundScore);
statusLabel.setText(status);
remove(dice);
add(dice, BorderLayout.SOUTH);
statusPanel.setBackground(Color.gray);
revalidate();
repaint();
}Any suggestions on how to pause while still redrawing the GUI components?I don't think this can be that short because my code is in its draft state, since I'm commenting all the possible ways to pause the execution; however, I will give you a summary of my PigPlayer class (the main method is totally irrelevant in this case):
import java.awt.*;
import javax.swing.*;
import javax.swing.border.*;
import java.awt.event.*;
public class PigPlayer extends JPanel {
private Dice dice;
private int points, humanScore, computerScore, roundScore;
private boolean comp, endTurn, time;
public static boolean end, pass;
private String name, info;
private static String status;
private static final int GOAL=100, TURNOVER=20;
public static int humanScores;
private JLabel roundScoreLabel, turnLabel, infoLabel, statusLabel;
private JPanel turnPanel, statusPanel, musicPanel, centerPanel;
private Timer timer;
public PigPlayer() {
public PigPlayer(String name, boolean comp) {
// Sets up a PigPlayer's JPanel with the specified information.
public void update() {
// Updates the JLabels and the Dice pictures that were added to the JPanel above.
// I leave the go() method, for this is the part being worked on.
public void go() {
if (!end) {
if (!comp) {
rollDice();
if (losePoints()) {
JOptionPane.showMessageDialog(null, name+" got too ambitious and rolled snake eyes!\n"+name+" lost all points.");
} else
if (loseRound()) {
JOptionPane.showMessageDialog(null, name+" got too ambitious and rolled a one!\n"+name+" lost all points for this round.");
} else
roundScore += points;
if (humanScore+roundScore>=GOAL) {
humanScore += roundScore;
status = name+" has won the game!";
end=true;
update();
if (comp) {
while (!pass) {
/*timer = new Timer(1000, new ActionListener () {
public void actionPerformed(ActionEvent e) {
time = true;
timer.start();*/
if (time) {
if (computerScore+roundScore>=humanScores+TURNOVER) {
status = name+" has turned over the dice by default.";
update();
JOptionPane.showMessageDialog(null, status);
status = " ";
pass=true;
} else {
rollDice();
update();
/*try {
Thread.sleep(1000);
catch (InterruptedException e) {
e.printStackTrace();
//I want to use a Timer here, instead of JOptionPane.
//JOptionPane.showMessageDialog(null, name+" has rolled: "+toString());
if (losePoints()) {
JOptionPane.showMessageDialog(null, name+" got too ambitious and rolled snake eyes!\n"+name+" lost all points.");
} else
if (loseRound()) {
JOptionPane.showMessageDialog(null, name+" got too ambitious and rolled a one!\n"+name+" lost all points for this round.");
} else
roundScore += points;
if (computerScore+roundScore>=GOAL) {
computerScore += roundScore;
status = name+" has won the game!";
pass=true;
end=true;
update();
time = false;
//timer.stop();
// Some code executed OUTSIDE of PigPlayer when this PigPlayer is finished with its turn.
public void pass() {
if (!comp) {
humanScore += roundScore;
roundScore=0;
if (humanScore>=humanScores)
humanScores = humanScore;
else {
computerScore += roundScore;
roundScore=0;
update();
// This PigPlayer rolls its set of Dice.
public void rollDice() {
dice.roll();
points = dice.getValue();
// When this PigPlayer loses a round or all of its points.
public boolean loseRound() {
if (dice.firstDie()==1 || dice.secondDie()==1) {
roundScore = 0;
pass=true;
update();
return true;
else
return false;
public boolean losePoints() {
if (dice.firstDie()==1 && dice.secondDie()==1) {
humanScore = 0;
computerScore = 0;
roundScore = 0;
pass=true;
update();
return true;
else
return false;
}I left out most of the methods, for they don't even apply to this class or are commented parts that are simply methods using Thread.sleep(int delay) or other.
Does this help at all, or did you want something different? -
Pause execution of SQL file on error
I have a build file where I am calling the create scripts of my DB objects. Eg:
@@COUNTRY_MASTER.sql
@@COUNTRY_MASTER_AUDIT.sql
@@COUNTRY_MASTER_TEMPTABLE.sql
@@COUNTRY_MASTER_WORKTABLE.sql
I want to pause or exit the execution of this script in case any script fails. Also in case of failure I want to know where the script failed (which line and file name).You can exit sqlplus when an error occurs using the WHENEVER command macro:
WHENEVER OSERROR
Performs the specified action (exits SQL*Plus by default) if an
operating system error occurs (such as a file writing error).
In iSQL*Plus, performs the specified action (stops the current
script by default) and returns focus to the Workspace if an
operating system error occurs.
WHENEVER OSERROR {EXIT [SUCCESS|FAILURE|n|variable|:BindVariable]
[COMMIT|ROLLBACK] | CONTINUE [COMMIT|ROLLBACK|NONE]}
WHENEVER SQLERROR
Performs the specified action (exits SQL*Plus by default) if a
SQL command or PL/SQL block generates an error.
In iSQL*Plus, performs the specified action (stops the current
script by default) and returns focus to the Workspace if a SQL
command or PL/SQL block generates an error.
WHENEVER SQLERROR {EXIT [SUCCESS|FAILURE|WARNING|n|variable|:BindVariable]
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How pausing execution of media player when this Vi closes
Hi,
I would like to use a subvi that executes 20 seconds of playing movie with media player and then pauses. For this I succeed writing it.
Next, I would like the vi closes and when the main vi recall the subvi, I want that the movie plays in the state it finished before.
Is it possible to do this?
Thanks in advance.Hi nousome,
this could be done by setting in the "VI Properties"- dialog the options "Show Front Panel when called" & "Close afterwards..." in the section "window appearance". Then let the video play for 20 seconds, when the VI finishes it closes by itself. After this, all local variables (controls & indicators) which are not connected to the connector pane keep their state until you unload them from memory (close LabView). So you can store the current video position inside the VI and start the video at this point with the next VI- call.
Another good solution to save values inside a sub-VI between VI- calls is an uninitialized shift register. If you have difficulties implementing this lok at the example "Single Execution Uninitialized Shift Registers.vi". I found this in my LV 7.1 but older versions should have this example too.
Hope this helps,
Dave
Greets, Dave -
What I am trying to do is display a JLabel and then after 5 seconds I wish to hide the label. I have the following code but it does not work???
label.setText("hi")
try {Thread.sleep(5000);} catch (InterruptedExecution e){}
label.setText(null)Try this code:import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
public class Test extends JFrame implements ActionListener {
private int state;
private String[] texts;
private JLabel label;
public Test () {
state = 0;
texts = new String[] {
"1",
"2"
label = new JLabel ();
label.setHorizontalAlignment (SwingConstants.CENTER);
setLabelText ();
JButton button = new JButton ("Change the label text in a second");
button.addActionListener (this);
getContentPane ().setLayout (new GridLayout (2, 1, 5, 5)); // beautiful GUI
getContentPane ().add (label);
getContentPane ().add (button);
setDefaultCloseOperation (EXIT_ON_CLOSE);
setTitle ("About changing a label");
pack ();
setLocationRelativeTo (null);
show ();
private void setLabelText () {
label.setText (texts[state]);
public void actionPerformed (ActionEvent event) {
state = (state + 1) % texts.length;
new java.util.Timer ().schedule (new TimerTask () {
public void run () {
setLabelText ();
}, 1000);
public static void main (String[] parameters) {
new Test ();
}Kind regards,
Levi -
Hi Gurus
Is there a way to pause execution of workflow? It looks like this
1. Start of Worflow
2. Executing some action
3. Entering loop
3. Waiting 1 hour/day/month
4. Checking condition of ending loop
5. Ending Workflow
Maybe there is an event that is triggered every hour/day/month so that I could put inside this loop waiting for event. Any ideas?I've had a similar problem working in an HR environment some time ago.
My solution was to use recursive calls to the workflow.
So basically the workflow consisted of a 2 branch fork
The first waited for events to check if the job was done, if so, the wf ended, the second branch had a deadline monitoring step waiting some time, if it was surpassed, it send an email and recursively called the workflow (with some binded extra data like nr of times it was called etc.).
You can use all sorts of logic in this kind of structure.
Kind regards, Rob Dielemans -
Unknown Error when starting the Group Policy Editor
On Windows 8.1 Professional, I opened the "Edit group policy" from the control panel and also tried to start gpedit.msc from an elevated CMD prompt. In both cases I get the following error message:
In English: Failed to open GPO. You may not have appropriate rights. Details: Unknown Error
There it is again - this dreaded "Unknown Error" message - telling me absolutely nothing about the cause of the problem.
In the past I have been able to launch the GPE on that machine without problems. I can absolutely not remember having messed around with the system files or registry settings. So there is no suspicious thing I could have done to break something. I had a
look at all copies of the GPEDIT.MSC in an editor but none of them looked broken in any way.
I startet C:\WINDOWS\SYSTEM32\MMC.EXE C:\WINDOWS\SYSTEM32\GPEDIT.MSC using the debugger of Visual Studio and paused execution after the error dialog had poped up. I got this call stack:
gpedit.dll!ReportError(struct HWND__ *,unsigned long,unsigned int,...) Unknown
gpedit.dll!CComponentData::Load(struct IStream *) Unknown
mfc42u.dll!CWinApp::ProcessShellCommand(class CCommandLineInfo &) Unknown
I had configured the debugger to break on all exceptions but as you see yourself, MMC is an MFC 4.2 app that doesn't use exceptions.
Since I get no access to the symbols of gpedit.dll, can anybody please tell me which conditions - i.e. problems - in Load() are handled by simply returning E_FAIL? What could be wrong with my machine?Hi,
Consider the corrupted local policy files and system files, please try these steps:
Step 1: clear local GP by running these commands:
RD /S /Q "%WinDir%\System32\GroupPolicyUsers"
RD /S /Q "%WinDir%\System32\GroupPolicy"
gpupdate /force
Step 2: To scan system files by running this command as admin:
SFC /SCANNOW
Andy error, please post back the CBS.log
Then, restart the computer to check the results.
Also, the event log (Open local event viewer) will show something related to this issue, please check event under
Windows log\Application and Applications and services log\Microsoft\Windows\Grouppolicy, post back if you find any error about this issue.
Kate Li
TechNet Community Support -
Hello,
I am attempting to create my own version of modelsupport2.dll's parallel UUT dialog. (It will use the TestStand Sync Manager to enqueue requests just like the existing Parallel model's parallel UUT dialog does.) I am faced with a couple issues right off the bat that don't make a whole lot of sense to me.
For one thing, despite the fact that my dialog box (written in VB .NET by the way) is initialized in a sub-sequence of the TestUUTs execution entry point that is configured to run in a separate thread, the TestUUTs sequence still hangs around and waits for the dialog box to close before continuing on. (This is clearly a problem since the whole point is to have the main thread continually process requests while the dialog box on a separate thread is busy enqueuing requests...) Does anyone have any idea why that could be happening? Maybe other sequence settings that I'm not aware of?
Another problem I'm having (although I wasn't initially having this problem) is the following error message: "Expected Object Reference, found Object Reference". The error code shows "-17308; Specified value does not have the expected type". This happens in the .NET action step in which I call my .NET assembly to create the object representing the dialog. The object reference specified for the create object call is a parameter called CustomDialogRefParam - a parameter of type Object Reference. The TestUUTs execution entry point has a CustomDialogRef local variable of the same type, and it passes it by reference to the Run UUT Info Dialog subsequence... The idea was that the Run UUT Info Dialog subsequence would create the object, and from that point on, it would be available to the TestUUTs sequence. Is there anything fundamentally wrong with this idea, or does anyone have any suggestions as to what may be causing this sort of error?
Thanks for any suggestions. Let me know if I need to clarify anything.Hello,
Thanks for the feedback. I actually fixed the problem with the thread not operating independently, (although I can't say I'm completely sure why I needed to do what I did). The function call that starts the dialog is passed the sequence context from TestStand. In order to allow TestStand to continue I had to set the sequence context's thread to the "externally suspended" state. I can now get it to work in a very simple fashion. (Basically, all it does is open up and wait for the user to click the exit button. When that happens, the dialog uses the sync manager component to enqueue the appropriate requests to cause TestStand to stop all test sockets and exit the "process dialog requests" consumer loop. Only problem I have now, is that for some reason, if I put a break point in the sequence after the dialog has been initialized, execution on the main thread stops as expected, but then attempting to step into, step over, or continue cause it to just hang. (I can't even terminate the process - I have to actually close TestStand entirely.) So long as I don't pause execution though, it runs flawlessly.
I'm still stuck on the passing of the .NET object reference though. Oddly enough, it seems to work if I reference the object reference in a subsequence using the following syntax:
RunState.Caller.Locals.CustomDialogRef
But if I try to create an object reference parameter and pass the custom dialog ref by reference, it still fails with this strange "type mismatch"... I still can't find any solution that works for accessing the object reference from sequences that are started on a separate execution... Maybe I can store the reference in a station global... I hate using globals though - it goes against my idea of good programming.
Anyway, thanks again, and any additional suggestions are certainly appreciated. -
C++ programmer needs help in Java.
Greetings, I am new to Java after programming in C++ and am having a few troubles finding parallels to a few essential operations, such as:
What are the Java equivalents to cout, cin and getch()?
Or simply, how do you do output, get input from the user, and pause execution?
Thank you all for any help you can offer.
DagkhiLook over this group of threads that a search of the Forum using "system.in" listed:
http://search.java.sun.com/search/java/index.jsp?col=javaforums&qp=%2Bforum%3A54&qt=system.in&x=14&y=6 -
Hi everyone!
I am programming a OSGi bundle using Eclipse. The problem is that I don't know how to use the stop method in the Activator class so my program does never stop and I have to stop it by hand. For example:
public void start(BundleContext context) throws Exception {
System.out.println("Starting bundle"); }
public void stop(BundleContext context) throws Exception {
}The console shows the Starting bundle message but instead of stopping the program after doing the only thing it must do, it does not stop. What should I write in the stop thread so that the program after showing the message stops?
Thanks in advance!What exactly are you trying to do? Calling Thread.stop( ) is inherently a bad idea (see the Javadocs).
You are getting a IllegalStateException because Thread.stop( ) kills the thread, you would need to create a new thread to resume execution.
If what you are trying to do is pause execution, you probably want to redesign your thread's tasks into smaller chunks that can be launched separately. Alternatively, have the thread check it's interrupted state and if a flag was set block on a monitor until you want it to resume execution. -
I'm diagnosing a native memory leak in a java process(not caused by a user JNI library, probably due to not closing some stream tied to native resources). I had used this technique before with some success, but this time I'm running into some problems. Basically what I'm doing is using libumem and mdb to help find the leak. I realize that these tools can give some strange results when looking at the JVM, but previously when I have it used, I can just focus on the leaked buffers with a large count and that pointed me right to the problem(the problem is bad enough that eventually I run out of memory space for the process...so I know the leak is being triggered repeatedly). The first problem I have is with libumem/mdb and the stack printed out through bufctl_audit which only displays symbol addresses for java routines. If it displayed the java symbol names, or if there were a way to make it display them then I wouldn't have much of a problem(though I've found I need to increase the audit size because of the large stack frame for a java process).
So what I've done before is find the C library/routines where the memory is being leaked at, and then use dtrace to print stack traces for calls into that C library. Something like this:
dtrace -n 'pid$target:libzip:ZIP_GetEntry:entry { @s[jstack(60,3000)] = count() }' -p <PID>
This has pointed me to the right place in the past, because the place where the leak was happening was getting called frequently. The problem is with the current leak is this is much too course grained. The C library being called is being called quite often, so I'm getting way too many stacks, and sorting through to find the problematic one is difficult. Now if jstack() would show the java symbol name AND its address I could easily correlate it with what's in the findleaks/bufctl_audit output of libumem/mdb.
Is there something I can do inside mdb to help find the java symbol names, or is there a way to use dtrace to correlate the java symbol name with its address to help me out here? I can do some rather ugly iterative stuff with dtrace where I don't give it a large enough buffer to print the whole stack trace and with small increases probably find the mappings from the java symbols to the address, but I was hoping there was something a little less painful. This of course needs to be diagnosed in a production system...so what I can do is somewhat limited. There is redundancy, so I obviously can for a short period pause execution on one server to grab the findleaks output and things like that. Thanks,
MicahSince your question is about tracing Java internals, you might do better posting in a Java-related forum. (This forum is for Sun Studio, for developing in C, C++, and Fortran.) Try one of the forums listed under Java here:
[http://forums.sun.com/index.jspa?tab=forums]
and especially here:
[http://forums.sun.com/category.jspa?categoryID=39] -
I'm relatively new to iPhone development and I have been working on adding onto the iPhone web app "National Parks" Dashcode example and I have gotten to a point where I want to use the debugger to look at some javascript variables.
So, I set some breakpoints and I run the simulator, but the simulator never pauses. (I know that part of code is running because some alert()'s are showing.) I've tried to Pause execution by selecting Debug > Pause and the Run Log says "Pausing at the next opportunity," but it never pauses.
I'm not getting any useful information in the debugger. I tried View > Stackframe while the simulator was running, but its blank and doesn't show anything.
Is there something I missed? Some sort of setup to make this work?
I am using:
MacBook Pro with Mac OS X v 10.6.4
Dashcode v 3.0.1 (330)
iPhone Simulator v 4.0 (211.1)
PS. I found a similar problem on this forum, but it was from last year. http://discussions.apple.com/message.jspa?messageID=9043258
Their problem was with a new SDK - and solutions were to install an older SDK or to choose Debug > Run Settings > Simulator - iPhone OS 2.2 instead of iPhone OS 2.2.1. I have 2 options in Run Settings. One is iPhone OS 3.2 and iPhone OS 4.0. I tried choosing 3.2 but the Simulator launched an iPad in simulation, but the breakpoints still didn't work...Same config and same thing for me. Debugger does not work.
The console application leaves two messages :
17/08/10 22:24:52 UIKitApplication:com.apple.mobilesafari[0x6088][6129] objc[6129]: found old-ABI metadata in image /Developer/Applications/Dashcode.app/Contents/Resources/DashcodeClient.app/Cont ents/Frameworks/CayenneClientDebugger.framework/CayenneClientDebugger !
And another one :
17/08/10 22:24:52 MobileSafari[6129] Couldn't load debugger
As a workaround I debug on a Safari product and it works. Although I can't debug mouse gesture. -
Hey guys,
my idea to start virtual machines in SCVMM which are offline and to perform a client action (via SCCM) to roll out the new updates our company released, only needs a lil piece in that puzzle. If the newest updates are deployed and installed, I want to shut
down the virtual machines. The trigger delay, that you can set up in the "links" between the actions, can only set up to 999 seconds.
Do you have an idea to trigger a delay, that can shut down the virtual machines after 2 days, for example? I don´t know that much about scripting, maybe there is a easier way.
Thanks for your help and best regards,
SimonYou can use a "run .net activity" and use PowerShell:
Start-Sleep -seconds 172800 #pause execution for 2 days
There should be a better way than to have a runbook sit idle for two days. You might look into triggering the runbook from an external scheduling application like Control-M or something similar.
Maybe you are looking for
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