While loop never stops after reading the result

I 'amattaching the program with thismessage in which while loop never stops, going on continuing until I stops it manualy using the off button What i have to do to get it off automatically afetr execution and reading the query and getting the result in Read in Front panel
Attachments:
PMd VI.vi ‏33 KB

Your stop condition is "continue if true". This means that, unless you press the button, the while loop will stop after one iteration.
First, you should change the termination condition to "stop if true".
Then you should make the stop button "latch when released" (right-click..mechanical action). Else you don't have a well defined state after the program stops.
You should decide on a reasonable loop rate and enter it for the wait control. (beter use a diagram constant if the value is always the same).
Why do you need to continue reading in a loop? Are you expecting the response to change over time?
Do you want to keep appending to the string indicator or only show the latest characters received?
Maybe you also need a wait between the writing and reading?
Delete the ms timer value indicator, it is completely useless.
Do you get any error codes?
Don't use the run continous button. Use the plain run button.
What device are you communicating with? Do you have documentation?
LabVIEW Champion . Do more with less code and in less time .

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Execution stops after retrieving the factory from the ServletContext while

Hi,
I just started working with Quartz, so I am clueless as to why I am getting this error. This is my first time tying to integrate Quartz 1.6.0 in a web app. I am using the JSF Framework. Although I have added the necessary jars I am still getting the error above: servlet.jar not loaded. If you follow the java code and server output you can see that after retrieving the factory from the ServletContext there is no further execution . Following is the definition of the class used for scheduling:
Quartz Version: 1.6.0
IDE : Netbeans 5.0
AppServer: Tomcat 5.5
*************************************** JAVA CODE *************************************
* BirthdayScheduler.java
* Created on May 20, 2008, 5:24 PM
package com.csg.cs.cscomwebdev.servlet.timer;
import java.io.*;
import java.net.*;
import java.util.Date;
import javax.servlet.*;
import javax.servlet.http.*;
import org.quartz.JobDetail;
import org.quartz.SchedulerException;
import org.quartz.SimpleTrigger;
import org.quartz.impl.StdSchedulerFactory;
import org.quartz.Scheduler;
* @author Arijit Datta
* @version
public class BirthdayScheduler extends HttpServlet {
/** Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
* @param request servlet request
* @param response servlet response
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
out.close();
/** Handles the HTTP <code>GET</code> method.
* @param request servlet request
* @param response servlet response
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
/** Handles the HTTP <code>POST</code> method.
* @param request servlet request
* @param response servlet response
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
/** Returns a short description of the servlet.
public String getServletInfo() {
return "Short description";
public void init()
System.out.println(" ------------ STARTTING JOB --------------");
// Retrieve the ServletContext
ServletContext theApplicationsServletContext = this.getServletContext();
// Retrieve the factory from the ServletContext
StdSchedulerFactory factory =(StdSchedulerFactory)theApplicationsServletContext.getAttribute("QuartzFactory Servlet.QUARTZ_FACTORY_KEY");
System.out.println(" ------------ FACTORY GOT --------------");
try {
// Retrieve the scheduler from the factory
Scheduler scheduler = factory.getScheduler();
System.out.println(" ------------ SCHEDULER GOT --------------");
// Start the scheduler
scheduler.start();
System.out.println(" ------------ SCHEDULER STARTED --------------");
//Creating a job
JobDetail birthdayJobDetail = new JobDetail("birthdayReminderJob", scheduler.DEFAULT_GROUP, BirthdayReminderJob.class );
System.out.println(" ------------ JOB CREATED --------------");
//Creating a trigger
SimpleTrigger birthdayJobtrigger = new SimpleTrigger("birthdayReminderTrigger",scheduler.DEFAULT_GROUP, new Date(),null,SimpleTrigger.REPEAT_INDEFINITELY, 60L * 1000L);
System.out.println(" ------------ TRIGGER CREATED --------------");
//Scheduling the job
scheduler.scheduleJob(birthdayJobDetail,birthdayJobtrigger );
System.out.println(" ------------ JOB SCHEDULED --------------");
} catch (SchedulerException ex) {
System.out.println(ex.getMessage());
} ************************************* SECTION OF WEB.XML ************************
<servlet>
<description>Quartz Initializer Servlet</description>
<servlet-name>QuartzInitializer</servlet-name>
<servlet-class>org.quartz.ee.servlet.QuartzInitializerServlet</servlet -class>
<init-param>
<param-name>shutdown-on-unload</param-name>
<param-value>true</param-value>
</init-param>
<init-param>
<param-name>start-scheduler-on-load</param-name>
<param-value>true</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet>
<servlet-name>BirthdayScheduler</servlet-name>
<servlet-class>com.csg.cs.cscomwebdev.servlet.timer.BirthdayScheduler< /servlet-class>
<load-on-startup>1</load-on-startup>
</servlet> *********************************** SERVER OUTPUT *******************************
Using CATALINA_BASE: C:\Documents and Settings\165171\.netbeans\5.0\jakarta-tomcat-5.5.9_base
Using CATALINA_HOME: D:\Program Files\netbeans-5.0\enterprise2\jakarta-tomcat-5.5.9
Using CATALINA_TMPDIR: C:\Documents and Settings\165171\.netbeans\5.0\jakarta-tomcat-5.5.9_base\temp
Using JAVA_HOME: C:\Program Files\Java\jdk1.5.0_02
May 20, 2008 7:27:13 PM org.apache.coyote.http11.Http11Protocol init
INFO: Initializing Coyote HTTP/1.1 on http-8084
May 20, 2008 7:27:13 PM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 766 ms
May 20, 2008 7:27:13 PM org.apache.catalina.core.StandardService start
INFO: Starting service Catalina
May 20, 2008 7:27:13 PM org.apache.catalina.core.StandardEngine start
INFO: Starting Servlet Engine: Apache Tomcat/5.5.9
May 20, 2008 7:27:13 PM org.apache.catalina.core.StandardHost start
INFO: XML validation disabled
May 20, 2008 7:27:14 PM org.apache.catalina.loader.WebappClassLoader validateJarFile
INFO: validateJarFile(D:\Java Programs\cs\CSCOMWEBDEV\build\web\WEB-INF\lib\servlet.jar) - jar not loaded. See Servlet Spec 2.3, section 9.7.2. Offending class: javax/servlet/Servlet.class
log4j:WARN No appenders could be found for logger (org.apache.catalina.session.ManagerBase).
log4j:WARN Please initialize the log4j system properly.
------------ STARTTING JOB --------------
------------ FACTORY GOT --------------
May 20, 2008 7:27:15 PM org.apache.coyote.http11.Http11Protocol start
INFO: Starting Coyote HTTP/1.1 on http-8084
May 20, 2008 7:27:15 PM org.apache.jk.common.ChannelSocket init
INFO: JK: ajp13 listening on /0.0.0.0:8009
May 20, 2008 7:27:15 PM org.apache.jk.server.JkMain start
INFO: Jk running ID=0 time=0/32 config=null
May 20, 2008 7:27:15 PM org.apache.catalina.storeconfig.StoreLoader load
INFO: Find registry server-registry.xml at classpath resource
May 20, 2008 7:27:16 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in 2802 ms Can anybody please help out? Where exactly am I going wrong?
Thanks a lot!
AD

Your stop condition is "continue if true". This means that, unless you press the button, the while loop will stop after one iteration.
First, you should change the termination condition to "stop if true".
Then you should make the stop button "latch when released" (right-click..mechanical action). Else you don't have a well defined state after the program stops.
You should decide on a reasonable loop rate and enter it for the wait control. (beter use a diagram constant if the value is always the same).
Why do you need to continue reading in a loop? Are you expecting the response to change over time?
Do you want to keep appending to the string indicator or only show the latest characters received?
Maybe you also need a wait between the writing and reading?
Delete the ms timer value indicator, it is completely useless.
Do you get any error codes?
Don't use the run continous button. Use the plain run button.
What device are you communicating with? Do you have documentation?
LabVIEW Champion . Do more with less code and in less time .

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Hi Experts,
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Edited by: Matt on Dec 6, 2009 1:39 PM

Dear thr,
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My MacMini does not stop after giving the order ''switch off''.
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Two while loops working in parallel at the same time

Hello, how can I run a .vi with two while loops working in parallel at the same time? . I want that when I run a vi both can be activated o desactivate, but I can't get it. What can I do?
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Here are some links for state machines.
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AI Read is executing only once in a while loop instead of continuously scanning the channels

The ultimate goal is to sample 15 channels (1 at 20kHz, 9 at 1000Hz, and 5 at 100Hz). Since only one scan rate is possible, I would like to reduce the data (for both displaying and saving purposes). The decimate function does not seem to work correctly.
Attached is the current subroutine used to 'decimate' the data. It seems to work on the first loop iteration, as seen by the data block with correct time stamps and data values, but with each additional iteration, all values are zero. Why is only one scan being used in the displaying of data?
Attachments:
Acquire_N_ScansNM4.llb ‏76 KB

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How to stop execution in while loop without stopping execution of other loops in the same vi

HI
I am quite a novice in Labview.
I have a problem in my project. I used a while loop inside my vi to build an array of ten values along with other loops. Then I used a stop button to stop manually the while loop. But it seems like the loop doesn't stop in the middle of the array building and so other loops in the vi doesn't work until the while loop finishes building the array and as soon as while loop execution is over, the complete vi stops. But all that I wanted was to build the array using the shift register along with the control to stop building array anytime. And not to stop execution of other structures when the while loop finishes.
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Hi Rahul,
Modified ur Vi to work with single button.
But the subtract case is not in any loop.
So, once both the loops stop, the subtract case will execute only once. Depending on state of subtaract boolean at that time, corresponding case will be executed and the Vi will stop.
so think of a logic where u can put this also in a new loop.
Or you can also incorporate it in one of the two loops and pass the other loop's data to it.
Let us know how you will proceed in this regard
I am posting your VI as well a VI with my modifications VI in Labview 7.0 so that Thomas can give his suggestions too
Plus, always keep a time delay in your while loops.
Oh sorry, the "arrayinouttestnewfinal.vi" is the modified vi
Regards
Dev
Message Edited by devchander on 01-10-2006 06:15 AM
Message Edited by devchander on 01-10-2006 06:19 AM
Attachments:
arrayinouttestnewfinalnew4.vi ‏59 KB
arrayinouttestnewfinal.vi ‏63 KB

First i open google search page.after seeing the results if i click in any site the site appears in a new tab.how can i stop this?

these days i face this problem.whenever i click on a site it appears in a new tab.how can i stop it?

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How do I exit a while loop which has a 'read from spreadsheet' pop up in it?

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While loop with stop button within event structure locks up front panel.

I am not sure if this is a bug with my program or a bug within LabVIEW. If you believe that this is a bug with my program then I will post my program to be looked at.
The problem I am having is there is a while loop within an event structure that fires when a particular value changes. Once the "Activate" button is pressed the while loop within the event structure starts going with a polling frequency of 1hz (1000ms wired to the "wait till next ms multiple" vi). There is a "Deactivate" button that is wired to the stop control of the while loop and an outter while loop that resets the event structure so that the activate button is being listened to again.
Once inside the while loop, however, none of the button are responsive within the front panel. The VI continues to run, and only 60% of my CPU is being consumed, but none of the button or scroll bars work. The only way for me to terminate the program is with the "Abort" button next to the "Run" button. If I remove the event structure so that the while loop in question runs as soon as the program starts, the front panel remains responsive. I've inserted probes within the while loop and verified that it is not running prior to the "Activate" button being asserted, and it is running after the assertion of the "Activate" button with the expected polling frequency set by the "wait till next ms multiple" vi.
Can anyone help? Do I need to post my code?
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It is typically not a good idea to stall an event structure by placing loops inside event cases. What good is an event structure if it is not free to repond to events?
Have a look at some alternative solutions, such as in the following link:
http://forums.ni.com/ni/board/message?board.id=170&message.id=224817#M224817
LabVIEW Champion . Do more with less code and in less time .

How can I update cluster items from inside a while loop that does not contain the cluster?

I have a VI that contains front panel clusters and two while loops. The main cluster contains items such as a doubles "distance" and "stepsize" and boolean "step" (a whole buch of this type stuff). The first loop contains an event structure to detect front panel changes and the second contains code and sub VIs to perform operations based on detected events.
The operator can enter data into either double or click the boolean. If distance is changed the second loop does what is required to process the change. The same happens with stepsize. If step is clicked the ±stepsize value is added to distance and the result is processed. In each case the front panel should track the result of the input and subsequent processing.
Because the clusters are outside the while loop, they are not updated unless I click 'highlight execution' which seems to allow updating each time the execution highlight is updated. There are other issues if I move the clusters into one of the loops.
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Thank you for the response. I followed the link and tried reading everything you posted on AEs but I'm afraid that I didn't understand it all. It seems that each AE example had a single input and a single output (e.g. a double). Is this the case?
What I have is a couple of front panel clusters containing (approximately) 18 control doubles, 8 indicator doubles, 5 boolean radio button constructs and 26 boolean control discretes. I clusterized it to make it readable. In addition I'll eventually have a cluster of task references for hardware handles.
All I want to do is update the front panel values like I would do in a C, VB or any other language. I've tried referencing the cluster and using the reference from inside the loops. I've tied using local variables. Neither works. I'm experimenting with globals but it seems that I have to construct the front panel in the gloabal and then I wouldn't know how to repoduce that on the front panel of the main VI. Sometimes it seems that more time is spent getting around Labview constructs than benefitting from them.
I hope the 'Add Attachment' function actuals puts a copy of the VI here and not a link to it.
Thanks again for the suggestion,
Frank
Attachments:
Front Panel Reference.vi ‏33 KB

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While loop never stops after reading the result

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