Question about while loop using Timer?

I am trying to use a while loop to read data from oscilloscope through
GPIB card continously(lasting for a fixed time, for example,1 minute). I
want a Timer, when it expires, the while loop will stop. But I do not
know how to implement it.
Any help would be greatly appriciated!
Thanks in advance.
zhljh
Sent via Deja.com http://www.deja.com/
Before you buy.

In article <87q5t2$7kh$[email protected]>, wrote:
>I am trying to use a while loop to read data from oscilloscope through
>GPIB card continously(lasting for a fixed time, for example,1 minute). I
>want a Timer, when it expires, the while loop will stop. But I do not
>know how to implement it.
So, you need it to count down, then I assume? Okay, you need to put a
true/false node within your for loop. Set the true case to i=1 (iteration
of the for loop) so that it will initialize one time (and be true one
time). Then, add whatever time you need for the vi to run to that
indicator (where you send a numeric value on the first iteration). Put a
greater than comparison to the timer and the additoin of the indicator and
your value. Let that be the term
inating thing on your for loop.
Now, this might present a problem with a circular reference. If it does,
you'll need to basically do the same thing, only you'll need to send the
value through a shift register in the for loop.
Harry

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Should work fine, AFAIK.
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From: Adobe Forums <[email protected]<mailto:[email protected]>>
Reply-To: "[email protected]<mailto:[email protected]>" <[email protected]<mailto:[email protected]>>
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Design question about when to use inner classes for models

This is a general design question about when to use inner classes or separate classes when dealing with table models and such. Typically I'd want to have everything related to a table within one classes, but looking at some tutorials that teach how to add a button to a table I'm finding that you have to implement quite a sophisticated tablemodel which, if nothing else, is somewhat unweildy to put as an inner class.
The tutorial I'm following in particular is this one:
http://www.devx.com/getHelpOn/10MinuteSolution/20425
I was just wondering if somebody can give me their personal opinion as to when they would place that abstracttablemodel into a separate class and when they would just have it as an inner class. I guess re-usability is one consideration, but just wanted to get some good design suggestions.

It's funny that you mention that because I was comparing how the example I linked to above creates a usable button in the table and how you implemented it in another thread where you used a ButtonColumn object. I was trying to compare both implementations, but being a newbie at this, they seemed entirely different from each other. The way I understand it with the example above is that it creates a TableRenderer which should be able to render any component object, then it sets the defaultRenderer to the default and JButton.Class' renderer to that custom renderer. I don't totally understand your design in the thread
http://forum.java.sun.com/thread.jspa?forumID=57&threadID=680674
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Man adding a button to a table is much more difficult than I imagined.
Message was edited by:
deadseasquirrels

Stopping a while loop using the time difference of two tick counts

Hi Guys,
I'm currently writing a code which test how long does it take for a formula node to perform its operation. The program uses a while loop to perform the calculation, and the program stops after calculating when tick count has reached 10 seconds. The program then displays the number of iterations it does in 10 seconds.
So initially I created 2 frames of sequence structure. In my first frame I have my initial tick count, and in my second frame I have my final tick count and the while loop. I used the subtract function and divide the output by 1000 to get the time difference. Then using the comparison function, I set if output > 10 then the program should stop, to do this I linked the output of the comparison function to the stop button inside the while loop.
However, when I tried to run the code, the program just didn't run. Hence I created a similar program which puts the last tick count in new frame sequence. When I ran this code, the program never stopped.
Do you guys have any idea what went wrong with my codes.
Thank you!
Erry
Solved!
Go to Solution.
Attachments:
1. Tick Count.vi ‏27 KB
tickcoun2.vi ‏27 KB

Dataflow!
In both VI's the stop terminal of the while loop is controlled by a boolean whose source is ouside of the while loop. So that loop will either run once, or run forever, depending on the value of the boolean that is calculated before the loop starts and shows up at the tunnel going into the loop.
I would recommend looking at the online LabVIEW tutorials
LabVIEW Introduction Course - Three Hours
LabVIEW Introduction Course - Six Hours

While loop using a timer object

Hello Technet,
I have a file that gets created every night by a batch job and I need to send that file every night. So, I came up with a method (if there's a better way, I'd like to hear). I created a 2 hour timer object to run a while loop. While the time elapsed is less
than 2 hours, the loop will run. In the loop, I have a if condition to test for a file. If the file is not there, then sleep for 10 minutes. If the file is there, then send it to me with send-mailmessage. The problem is, I will get the file
sent to me at every interval because the loop is terminated by the timer. I would like the loop to terminate once the email message is sent to me. Here is my code snip. Can someone please help on getting the loop to terminate when the message is sent?
$file = "c:\file.txt"
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Send-MailMessage -smtpserver $SmtpServer -from $From -to $To -subject $Subj -body $Body -attachment $Attm

Hi,
You can use break:
http://ss64.com/ps/break.html
EDIT: Alternatively, you can try this:
$filePath = 'c:\file.txt'
$found = $false
Do {
$file = Test-Path -Path $filePath
If ($file) {
Send-MailMessage -To [email protected] -From [email protected] -Subject 'Got it' -Body 'Please see Attachment' -Attachments $filePath -SmtpServer smtp.domain.com
$found = $true
Else {
Start-Sleep -Seconds 600
Until ($found -eq $true)
This will loop until the file is found instead of relying on a timer.
Don't retire TechNet! -
(Don't give up yet - 12,700+ strong and growing)

Running java process in a while loop using Runtime.exec() hangs on solaris

I'm writting a multithreaded application in which I'll be starting multiple instances of "AppStartThread" class (given below). If I start only one instance of "AppStartThread", it is working fine. But if I start more than one instance of "AppStartThread", one of the threads hangs after some time (occasionaly). But other threads are working fine.
I have the following questions:
1. Is there any problem with starting a Thread inside another thread?. Here I'm executing the process in a while loop.
2. Other thing i noticed is the Thread is hanging after completing the process ("java ExecuteProcess"). But the P.waitFor() is not coming out.
3. Is it bcoz of the same problem as given in Bug ID : 4098442 ?.
4. Also java 1.2.2 documentation says:
"Because some native platforms only provide limited buffer size for standard input and output streams, failure to promptly write the input stream or read the output stream of the subprocess may cause the subprocess to block, and even deadlock. "
I'm running this on sun Solaris/java 1.2.2 standard edition. If any of you have experienced the same problem please help me out.
Will the same problem can happen on java 1.2.2 enterprise edition.?
class AppStartThread implements Runnable
public void run()
while(true)
try
Process P=Runtime.getRuntime().exec("java ExecuteProcess");
P.waitFor();
System.out.println("after executing application.");
P.destroy();
P = null;
System.gc();
catch(java.io.IOException io)
System.out.println("Could not execute application - IOException " + io);
catch(java.lang.InterruptedException ip)
System.out.println("Could not execute application - InterruptedException" + ip);
catch (Exception e)
System.out.println("Could not execute application -" + e.getMessage());

I'm writting a multithreaded application in which I'll
be starting multiple instances of "AppStartThread"
class (given below). If I start only one instance of
"AppStartThread", it is working fine. But if I start
more than one instance of "AppStartThread", one of the
threads hangs after some time (occasionaly). But other
threads are working fine.
I have the following questions:
1. Is there any problem with starting a Thread inside
another thread?. Here I'm executing the process in a
while loop.Of course this is OK, as your code is always being run by one thread or another. And no, it doesn't depend on which thread is starting threads.
2. Other thing i noticed is the Thread is hanging
after completing the process ("java ExecuteProcess").
But the P.waitFor() is not coming out.This is a vital clue. Is the process started by the Runtime.exec() actually completing or does the ps command still show that it is running?
3. Is it bcoz of the same problem as given in Bug ID :
4098442 ?.
4. Also java 1.2.2 documentation says:
"Because some native platforms only provide limited
ed buffer size for standard input and output streams,
failure to promptly write the input stream or read the
output stream of the subprocess may cause the
subprocess to block, and even deadlock. "These two are really the same thing (4098442 is not really a bug due to the reasons explained in the doc). If the program that you are exec'ing produces very much output, it is possible that the buffers to stdout and stderr are filling preventing your program from continuing. On Windows platforms, this buffer size is quite small (hundreds of characters) while (if I recall) on Solaris it is somewhat larger. However, I have seent his behavior causing problem on Solaris 8 in my own systems.
I once hit this problem when I was 'sure' that I was emitting no output due to an exception being thrown that I wasn't even aware of - the stack trace was more than enough to fill the output buffer and cause the deadlock.
You have several options. One, you could replace the System.out and System.err with PrintStream's backed up by (ie. on top of) BufferedOutputStream's that have large buffers (multi-K) that in turn are backed up by the original out and err PrintStream's. You would use System.setErr() and System.setOut() very early (static initializer block) in the startup of your class. The problem is that you are still at the mercy of code that may call flush() on these streams. I suppose you could implement your own FilterOutputStream to eat any flush requests...
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Questions about Indexing and Using an Indexing POA

Although I have only about 50 users, at least 15 of them have in excess of 100,000 messages in their accounts and the POA (version 7.0.2) is regularly slowing to a crawl. (I just know that plans for revolution are fomenting!) I have embarked on a campaign to reduce these accounts by archiving everything off to get mail accounts down to 3000 or fewer pieces. I have achieved user buy-in, but have worked on only a few users so far.
In another closely related thread, it was suggested to me that the PO speed issues relate to broken indexes. And I suspect that given so many messages, the indexes were never getting fully rebuilt with the default QF POA settings. I am trying to fix that situation in addition to reducing mail account sizes. So, I have set up a second POA on another server and dedicated it to the indexing task. The /qfinterval is set for 1 hour, other /qf switches at default. The POA-QF does no mail delivery, but it does do nightly user upkeep.
The POA-QF seems to be steadily working away and making progress at reducing the number of unindexed messages. However, I have questions about what I am seeing and what more I can do:
1. Is the progress I am seeing real progress? For example I have a user with over 100,000 messages to be indexed and every time I check the logs, the count drops by about 500 messages per hourly QF cycle. I assume that if I just let it keep running, it will eventually get caught up and fixed. Not only with this user, but with all the others as well. Will my patience (and theirs) be rewarded? Are there any gotchas I need to prepare for?
2. One user has recently had virtually all of her messages successfully moved to archive. I can see them in the Archive, and do not see them in the online account. However, now over a week later, QF still shows >130,000 items still left to index for that user. The POA-QF is making slow, steady progress reducing that number, but why is this user's QF count still so high? Does it just need more time, or is there something amiss for this user?
3. I may want to rebuild indexes for single users from scratch. I have seen the TID 3105742 which tells how to do this: Essentially you turn off mail delivery functions, and make some other switch changes to dedicate the POA to indexing for just a single user, and then you let the POA rebuild the indexes. The implication of that scenario is that the POA is now enjoying exclusive access to the user's databases.
If I want to use my secondary POA-QF to rebuild a user's index from scratch, does the main POA have to be offline and the user out of GWise? That is, Does the QF process require exclusive access in order to rebuild indexes from scratch?
Thanks for any thoughts or suggestions.
Peter Smick

pgsmick wrote:
> 1. Is the progress I am seeing real progress? For example I have a user with
> over 100,000 messages to be indexed and every time I check the logs, the count
> drops by about 500 messages per hourly QF cycle. I assume that if I just let
> it keep running, it will eventually get caught up and fixed. Not only with
> this user, but with all the others as well. Will my patience (and theirs) be
> rewarded? Are there any gotchas I need to prepare for?
Set this switch for this indexing POA - /qflevel=999 - this will index
everything in one run. It will take a long time, but with no qflevel switch you
are indeed only indexing 500 messages at a time, and if the user has that much
mail, it might never really catch up.
>
> 2. One user has recently had virtually all of her messages successfully moved
> to archive. I can see them in the Archive, and do not see them in the online
> account. However, now over a week later, QF still shows >130,000 items still
> left to index for that user. The POA-QF is making slow, steady progress
> reducing that number, but why is this user's QF count still so high? Does it
> just need more time, or is there something amiss for this user?
>
This is odd, because really the index count should drop to nothing, but with the
above switch this might get resolved as well.
> 3. I may want to rebuild indexes for single users from scratch. I have seen
> the TID 3105742 which tells how to do this: Essentially you turn off mail
> delivery functions, and make some other switch changes to dedicate the POA to
> indexing for just a single user, and then you let the POA rebuild the indexes.
> The implication of that scenario is that the POA is now enjoying exclusive
> access to the user's databases.
Not really - the POA is not enjoying exclusive access to the user's database,
the indexer is just avoiding an attempt to index anything else.
> If I want to use my secondary POA-QF to rebuild a user's index from scratch,
> does the main POA have to be offline and the user out of GWise? That is, Does
> the QF process require exclusive access in order to rebuild indexes from
> scratch?
No - QF never requires exclusive access. That said, you may find that an
extremely vigorous QF can cause slowdowns for the user.
Danita
Novell Knowledge Partner
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Reset while loop with time and button?

I am trying to get the while loop to stop and reset with a button or if time runs out. So when I switch the button it should stop the indicator; when I switch the button back on it should reset the time and start reading data again. Likewise, when time runs out it should stop the indicator and I want to flip the switch to start a new run and reset the time again. I have attached my vi for some clearification. If you have trouble understanding please let me know and Ill try and explain more. Thanks.
Attachments:
reseting_time_whlloop.vi ‏70 KB

Relient wrote:
I know my program is not efficient at all, Im inexperienced with labview and my company needs it soon so I'm trying to get it out quick. Attached is what I have so far. It is very messy!! However it is nearly working how we want. The producer/ consumer design is needed because I am implementing this into my other program and each loop has a different job than the other loops. This is just a mock version as I am trying to figure out the process.
The stop buttons aren't needed but the button labeled boolean should reset the time and stop the run. When the run is stopped I want to re-enter a 'test time' and hit the button again for a new run. I just need to be able to reset the original time... Is the producer/consumer the best way to connect while loops because it seems messy?
Again sorry if it is hard to follow and if its not the best way to go about it; I'm doing the best with what I know. Thanks for the help.
I realize you may need this soon but you will regret it later (or the next person to touch this code) when you need to touch it again. It is overly comnplicated, messy and not very well designed. Doing a bad job quickly is never the right answer. A little extra time spent up front to do it right can save tons more time later on.
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"Does anyone know where the love of God goes when the waves turn the minutes to hours?"
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Moving on -- here's my question:
I'm having trouble with working with HTML files in TextEdit. I'm on a Mac, using TextEdit as my HTML editor (I can not afford one of these other HTML editors, and I like using a simple text editor like TextEdit for HTML). Here's my problem: I open a new rich text document in TextEdit and write my HTML and then choose File>Save As and choose "HTML" under the File Format drop-down box. Having saved this file as an HTML file, I then open Safari and choose File>Open File and select my HTML file; however, when I do this, my web page's text does not appear in the browser window. Instead, the HTML code itself appears in the browser window, as if the browser was not interpreting it as HTML and converting it. The same problem happens when saving the file as a .htm file using Microsoft Word for Mac.
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What do you suggest I do?

Few questions about file sharing using airport

I'm thinking about getting an AirPort Extreme, but I have a few questions:
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Question about extend calendar using scal? help,help

recently, we received a mail from sap which saying about extending calendar using scal;
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I do know whether my steps is right?
I have two questions:
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Hi,
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Getting a new macbook, questions about transferring files with Time Machine

I now plan to switch computers to one of the new Macbook pros. Since I now use Time Machine, I'm planning to just upload the backup to the new computer when I get it. the backups are able to be transferred to a new one for an upgrade right?
Also, I had to switch hard drives once about 2 years ago, and when I did, the backup DVD I made for my iTunes didn't remember which of my ~2000 songs are checked and which aren't, leaving me to have to do it manually over the course of a few weeks. Will Time Machine do this for me?
I'm also running Leopard atm, will there be any problems uploading all the info since the new computer will be running Snow Leopard, and the backup was made through Leopard?

falkner09 wrote:
I now plan to switch computers to one of the new Macbook pros. Since I now use Time Machine, I'm planning to just upload the backup to the new computer when I get it. the backups are able to be transferred to a new one for an upgrade right?
Not via a full system restore. You want to use +Setup Assistant+ when the new Mac first starts up. You can transfer directly from the old Mac, or it's backups. See [Setting up a new Mac from an old one or its backups|http://web.me.com/pondini/AppleTips/Setup.html] (or use the link in *User Tips* at the top of the +Snow Leopard > Installation and Setup+ forum).
Firewire from the old Mac will be fastest, by far. If you use your network, connect via Ethernet cable; wireless will take an eternity.
Also, I had to switch hard drives once about 2 years ago, and when I did, the backup DVD I made for my iTunes didn't remember which of my ~2000 songs are checked and which aren't, leaving me to have to do it manually over the course of a few weeks. Will Time Machine do this for me?
It should.
I'm also running Leopard atm, will there be any problems uploading all the info since the new computer will be running Snow Leopard, and the backup was made through Leopard?
That's what +Setup Assistant+ is all about; it transfers everything except the old version of OSX.

PDA While Loop using Bluetooth results in interface lockup

The PDA Module ships with an example project that demonstrates client/server Bluetooth communication. I decided to try it out with my PC acting as the server and my PDA as the client. The demo basically transmits waveform data continuously via Bluetooth from server to client. Attached is the code for the client PDA and the heart of the code is a while loop which continuously accepts data via Bluetooth and outputs the data onto the display. For the most part, this is the stock example VI
that ships but I had to modify the interface with an event structure so
that I could use the PDA virtual keyboard to enter in the proper server
address.
The Bluetooth portion of the demo actually works great! When the data set is set to random, the PDA very quickly displays new random data on the LCD.
The problem occurs when I try to stop the VI. Both the disconnect and Exit booleans are unresponsive when I tap their respective buttons. My desired application will behave similarly to this demo which is why this is of concern to me. Is there a better way to implement a continuous Bluetooth polling system but still retain the functionality of my front panel?
System specifications:
PDA Module 8.0.1
iPAQ hx2790
Windows Mobile 5.0.
Attachments:
NI PDA Bluetooth demo.JPG ‏106 KB

Hi,
Just by looking at the snapshot it is hard to tell what's going wrong. Since the bluetooth part is working fine, I would suggest that you try to strip the bluetooth part from your VI and run the VI in highlight execution mode. This should shed some light on what happens when you click on Stop or Exit buttons. If you still need help after that, please post your stripped VI here and someone from the community will be sure to help you out.
Regards,
Ankita

How do i exit a while loop using event handler

Hello,
I have an event handler structure within which i run a while loop for a particular event. I would like to interrupt the execution of this while loop as soon as another event occurs, even if the while loop has not finished execution. I have tried so many ways, the best i could get is exiting one itteration after the new event occurs which is no good for me.
Any suggestions???
Thanks
Me

Instead of having a task while loop in an event case, put your task while loop in parallel with the loop surrounding the event structure. When the event which should start the task occurs, you can signal the start of the task while loop. You could use local variables of references to start/stop the loop when an event occurs. You could also use notifiers instead of variables to pass signals to start/stop the while loop. In general you should have a while loop for the event structure, and a parallel while loop to do the tasks. The parallel loop is controlled by variables or notifiers which are set in the event cases.
- tbob
Inventor of the WORM Global

How do I correctly time while loops using SCPI and VISA/Ethernet communication to send DC current Values to a Power supply?

I'm rather new to using labview and I having an
issue with a test Data Aquisition lab I'm trying to setup using a
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supply at a rate of atleast 10Hz and I'm using SCPI commands and VISA
communication through ethernet to do so. Attached below is the VI I
have written.
The issue I'm having is this:
My VI will
loop through the values fine in software, or so it seems. I am unable
to get the Power supply to update sequentially if I don't set my loop
delay to anything greater than 130ms. If I try to run the loop faster
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Attachments:
basic DC loop 6221 Keithley.vi ‏145 KB

Also, one of the string constants is NOT set to '\' Codes Display. Here is an alternative method of calculating the index. I removed the DAQ and VISA stuff since I could not run it.
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Attachments:
basic DC loop 6221 Keithley.2.vi ‏16 KB

Question about while loop using Timer?

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