Update of the indicators of the tank (by sending a command in a while loop)

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• The use of registers at offset in a while loop that never loop

  Here's a picture of 'syslog_Device function Engine.vi. This isn't really a question specifically about this vi, but rather a technique I see here.

  First thing I noticed, it was a while loop always outputs, never loops. And shift registers. This serves for the VI can retain values between calls, almost like what I consider a local variable which are persistent between function calls in another language? It is an interesting way to accomplish what I have not looked at.

  Please tell me if I'm missing what is happening here.

  

  It is a driving force.

  It's a code construct that allows you to encapsulate data and features that are available in multiple threads.

  The nugget I linked above explains their operation the theory behind them and follow-up discussions in discussion on how to exploit them.

  Good questin incidentally!

  Ben

• in what version of labview the ' stop if true ' condition become available for while loops?

  The answer to this question would mainly just my own curiosity, although it would also help to explain why some LabVIEW programs I have others that have been written in previous versions have strange as constructions invert a Boolean condition before it is wired to the 'continue if true' (when obviously they could have just wired the condition directly to a ' stop if true ').

  Not sure 100% but he could LV 6. I 6i on a virtual machine and it's there, and I don't remember having this feature available in LabVIEW 5.

• or HOW the signal to timer front door stop in while loop?

  Good afternoon

  Could someone please help. I have a project that is very basic. It performs replication of the mastermind game in labview2009 VI. I have managed to do work, but as soon as all the conditions are true my last or door sends the signal for the moment stop button loop.

  In other words, there is no time for my 'congratulations chain' to show before the game resets. What I have to do is to put a timer between the final or gate and my stop button, but all the methods I've tried don't seem to work as the data types do not match.

  Please please please a little help

  Alex

  
  

• ForEach: How to set the default value of a command link text while

  Hi all

  I use Jdev 11.1.1.7

  I have a page with 2 foreach

  <af:toolbar id="t1" inlineStyle="border:1px solid #bfc6c9;border-radius:2px;border-right:0px;">
              <af:forEach items="#{pageFlowScope.pbPagePovDetails}" var="page" varStatus="index">
                <af:panelGroupLayout id="pgl5" layout="vertical">
                  <trh:tableLayout id="tl1" cellPadding="0" cellSpacing="0" halign="center">
                    <trh:rowLayout id="rl1">
                      <trh:cellFormat id="cf2" inlineStyle="border-right:1px solid #bfc6c9;padding:3px;height:38px;">
                        <af:panelGroupLayout id="pov_pgl3" layout="vertical" inlineStyle="padding:5px; border-color:ActiveCaption;min-width:125px;">
                          <af:panelGroupLayout id="dc_pgl6" layout="horizontal"
                                               rendered='#{pageFlowScope.settingsDimLabel eq null or pageFlowScope.settingsDimLabel eq "Show Dimension Name"}'
                                               inlineStyle="font-weight:bold;">
                            <af:commandLink text="#{page.dimName}" id="dc_cl1" actionListener="#{pageFlowScope.HspPovBarBean.openMSFromDimension}" rendered="#{page.axisType==3}"/>
                            <af:outputText value="#{page.dimName}" id="ot1" rendered="#{page.axisType==2}"/>
                          </af:panelGroupLayout>
                          <af:panelGroupLayout id="dc_pgl9" layout="horizontal" rendered='#{pageFlowScope.settingsDimLabel eq "Hide Dimension Name"}' inlineStyle="height:10.0px;">
                            <af:spacer width="10" height="11" id="dc_s5" inlineStyle="font-size:small;"/>
                          </af:panelGroupLayout>
                          <af:panelGroupLayout id="dc_pgl7" layout="horizontal">
                            <af:forEach items="#{page.memDetail}" var="mem">
                              <af:outputText value="#{mem.memName}" id="ot2" rendered="#{page.axisType==2}" inlineStyle="font-size:smaller;"/>
                              <af:commandLink id="dc_cl2" text="#{mem.memName}" actionListener="#{pageFlowScope.HspPovBarBean.openMS}" inlineStyle="font-size:smaller;"
                                              rendered="#{page.axisType==3}"/>
                            </af:forEach>
  
  
                            
                          </af:panelGroupLayout>
                        </af:panelGroupLayout>
                      </trh:cellFormat>
                    </trh:rowLayout>
                  </trh:tableLayout>
                </af:panelGroupLayout>
              </af:forEach>
            </af:toolbar>
  

  His work as expected, but then the text is displayed in #{mem.memName} I want to manipulate this value.

  To do this, I created a variable at the bean

  public class HspPovBarBean{
  
  String memDisplay=null;
  
  
  public String getMemDisplay(){
  memDisplay = (String)resolveExpression("#{mem.memName}");
  memDisplay += ",";
  return memDisplay;
  
  }
  

  But I'm unable to get the value of memDisplay as its null.

  Please let me know if this isn't the correct way to this defect.

  Thank you

  ASHA as

  
  

  ASAS

  You can do it directly in the af: outputText

  or in the link or everywhere where you need to display the additional «»

  Timo

• Change the values of the cluster in while loop and in the face at the same time

  Hello.

  I have a little problem in a test program, that I'm working on. I'll try to simplify as much as possible. I have a cluster control that contains two controls A and B. I want to:

  1. switch to update the value of the command A a while loop
  2. allow the user to change the value of the B control through the face, while the loop is running

  To change the value of order in the while loop, I first get the cluster control cluster, update the value of the control for a way to group by name and finally rewrite the cluster in the cluster control.

  The problem is that if the user changes the value of the B control while control that is in the middle of the update, the new value of B control is lost because it was read before updating in the face. Is there a way to get around this?

  DennisBengs wrote:

  1. switch to update the value of the command A a while loop
  2. allow the user to change the value of the B control through the face, while the loop is running

  Then they do not belong in the same cluster.  They are disconnected obviously enough that they do not go hand in hand.

  Where it can get really complicated, it is that you're talking about the user and code changing the same cluster.  It is very dangerous and very difficult to manage.  You might be able to get there with a driving force.  But walk slightly, my friend.

• Update of the indicators of the façade is trolling in the test of the functions in the provider DLL

  I'm looking to see if someone can explain a behavior to display weird LabVIEW I see when to test some timeout works in a third party DLL. I have a work around in place but I would still like to know why, without the workaround, the information displayed by the indicators on the front panel are not synchronized with what is happening in the execution of the VI, even though I tried all sorts of things to impose the synchronization. Note that to run the VI in a useful way, you need to be able to communicate with a Galil axes via an Ethernet controller, and which, for the most part, limited this discussion to what the experts among you know happen under the hood of LabVIEW in situations like this.

  This is what looks like the VI when my work around (false wait added) is active. It's a small state machine that uses the elements of the array "Test Sequence" to tell him what to do in each step of its implementation. Here he plays a first time-out value, sets a new value of timeout, reading again, the timeout by asking a READING of the controller (without having first asked to say anything), followed by restoring the initial time-out and then tests to stop.  The two indicators in the red rectangle are there to show the current status of the execution, and it is this pair of indicators which are not synchronized with the State of the actual program.

  

  When execution completes, it is what we see.

  

  If the false timeout is too short, then the indicators are not synchronized with the State of the program, or in this case, with the other.  Note that the only time wherever the VI display is static enough for me to take a screenshot as it is during the period of "Test Timeout. When the time-out occurs Finally, things be synchronized and the same results are displayed.

  

  Here's the code.  I am also attaching a folder zipped with the code, just because I don't know if the extracts are smart enough to include all the dll referenced by library call nodes.

  

  Here on the left of the loop indicator 'State' and 'Index' terminals can be seen. The 'fake Wait' needed to make the indicators work synchronously appears below in the same area. Before coming with this 'fix' things I've tried, what has not worked, were:

  • addition of the structure of flat sequence seen here with the indicators in the first panel
  • Entrance to the 'value' property nodes using linked to two indicators with their outputs error Garland at the entrance of the error on the function 'G Read' (test timeout).
  • defining indicators for "synchronous display" (apparently this parameter actually only works with the multi-threaded code, which I don't believe it is)
  • setting false property to "postpone updates on the front panel.

  Another thing that worked linked a "probe" to any data path entrance side of the conditional structure. I thought that it causes also a few milliseconds of delay as the expectation.

  My best guess at what happens is that display updates are "launch and forget" actions that occur on parallel execution paths in the single execution thread and function on obtaining some of the main process to complete time slices. But when the main process is the name of an external library, which, outside the library can't share time with all other processes that can run in the same thread.  All this makes sense?

  This is because all these CFLN calls to the dll are set to run in the UI thread (to view the color orange on the top of the node).

  If they eat the cycles in the UI thread, they may not leave enough cycles to LabVIEW to make updates to the user interface of the front panel.

  What make these 3 part of the dll?  They need to run in the UI thread?  Is there a problem with the standby so that the DLLs are not pounding the UI thread?

• What are the alternatives to the update of the indicators using nodes of property?

  Hello

  I'm building a VI that must update several controls/indicators in several points throughout its execution. It must also be able to accept the new values of the controls at any time.

  The problem is that all these controls and indicators on the face before of the VI another who called my VI. The current version of my program updates all these controls and indicators using references and property nodes (each indicator/control to be used has its own reference on my VI control, and these references are then sent to nodes of property), which makes it naturally slow.

  At the moment I plan to rebuild my VI so that the principal is able to recover data without the help of the references, but it is not only a lot of time but also difficult and impossible without my code turning into a massive pile of disorganized (especially since the lab computer is quite slow and the main big enough VI that by pressing the button "clean/re-organize block" causes a crash).

  Alternatives to this? Queues?

  This (my nugget events) is the best general solution, I came here.

  Felix

• Progress bar not updated until the end of DLL fn

  I have a DLL that I am incorporating in a wrapper using LabVIEW 2011 SP1 Subvi.

  The exported DLL function updates the program on a PIC Microcontroller memory by creating an interface with the boot loader using only its own protocol CAN interface.

  The service takes about 20 seconds to write, read and check the operation succeeded, and I try to add an indication of progress.

  I have a LabVIEW test application vi which calls the Subvi dll and has a progress bar to provide feedback. Unfortunately I can't get the progress bar to update when the DLL is complete, but not when it does not, then he jumps just from 0% to 100%

  I made the assumption that the DLL is hogging the cpu and not allowing other indicators of labview to day or loops to run.

  The DLL includes calls to sleep briefly (3ms), and I upped half a second to see if that makes a difference

  It doesn't seem to be a way to get other items of LabVIEW to grab a slice of CPU.

  I tried to lower priority of Subvi to see if other threads in the code will preempt.

  I tried from the Subvi as an asynchronous call and collect the return status (with a waiting on asynchronous call) while a separate loop surveys trys to update the progress bar by calling a function exported in the same DLL accessor to get the value of the status property

  I've tried passing a blade refnum and update the property value directly from the DLL function from pointer to the value of parameter of function.

  I tried several variations and combinations.

  Is there a fundamental issue that prevents me from actively update the progress bar, while the DLL function runs, or am I missing a simple mechanism to achieve my goal.

  I look forward to suggestions of solutions or additional reading of the forum

  Thank you

  DLL called in the UI thread? If so, try switching to the call of Thread Safe (if DLL allow, of course)

• Operation Subvi don't update in the main program

  Hi all

  I'm having trouble with a VI I put together for laboratory research. I try to use two of the Subvi: one writes nine analog outputs through a PCI-6723, the other sends the commands M Code to a linear positioner through COM 4. Both work individually, but when I put in another VI, it seems that the outer loop only runs once. If I set a post and hit run, the track moves to this post but does not meet the additional entries. The tension control is doing absolutely nothing, predefined or not. The goal is that the two Subvi to run in real time. In other words, change the enum of the piece will automatically update the position and moving the sliders of tension with voltage indicators in real time and updated. I tried a few configurations without luck. Maybe it's because I'm trying to use a serial port and a data acquisition?

  I have attached the main VI and Subvi for review. All advice is appreciated.

  'Is it maybe because I'm trying to use a serial port and an acquisition of data?'

  No, that would be a silly limitation of the language

  There are a lot of problems with your application (on the other hand, you use a LabVIEW project to your hand and subVIs), like crazy in the Subvi DAQmx structures.

  The real bug you see, that's the reason why you do not understand how a shift register stores the data: using shift registers initialized to the two subVIs, so overwrite you the values stored in each iteration. You should learn about Global Variables functional and motor action, so you can understand the problem. If you need work on your subVIs (also), you will need to change their behavior. In their recent form, they are not able to do what you want... Do not have a state machine for the subVIs, use actions: Init, check, change, close. Therefore, it is very important that your subVIs only perform one action at a time. Finally, when you stop your hand while loop in your main VI, you call the two subVIs with action command 'Close' to close and delete tasks properly.

  Here's some reading more: http://forums.ni.com/t5/LabVIEW/Community-Nugget-4-08-2007-Action-Engines/td-p/503801

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  Line 159 Char Code 4 0

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  file

  rebooted - start and stop the service.

  Have you tried to use the Microsoft Fix It tool to reset the Windows Update components for you: http://support.microsoft.com/kb/971058?

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• Last update broke the audio playback.

  Everyone has had problems with their audio playback after updating to the new tools of gold 5.0?

  My game has roughly around 5 sound effects play.  I just did a player for each effect and then I have them prefetch at load time.   I keep track of what's currently playing and when I want to play another, I stop playing effect, if any, and start the next.

  Now all this code worked for my current game and 4 other games for 3 months.  The old 9550 beta Simulator 5.0 ran something comme.320 and this one is execute.535.  I am about to release my game, but now the testers reported, the game freezes when they improved a.607 ou.612.  So I installed the latest tools and the game will freeze now in the Simulator.  Everything works on my appareil.320

  I can solve the problem if I ever stop/interrupt an active player, but this reduces the quality of audio support still further.  The game freeze Player.start (calling).  He never returns back from this call.  It is stuck at MediaPlayer.transitionWait ().  I tried various fixes such as starts the new sound in the recall of playerUpdate at the end of the media or stopped event.

  I noticed this change.  If I break on exceptions, it appears on the stack.  It was not there en.320 is kind of fish.  Also, it is really hard to run with exceptions now and play the game as it keeps popping up.

  Object.wait(  ) 478
  MediaStreamingManagerImpl$StreamingSessionImpl$ReadThread.run(  ) 1259
  

  Here are the main battery for my thread to update when the deadlock occurs

  Object.wait(  ) 479
  BasicPlayerImpl$ReentrantLock.waitUntilLockAvailable(  ) 734
  BasicPlayerImpl.stop( boolean ) 374
  BasicPlayerImpl.stop(  ) 403
  AudioChannel.play( Player, int, int, boolean ) 201
  AudioEngine.playEffect( int, int, int, boolean ) 155
  Entity.playSoundEffect( int, float ) 320
  Entity.onExplode(  ) 839
  Bullet.onExplode(  ) 319
  Entity.onHitByBullet( Bullet, int ) 829
  Player.onHitByBullet( Bullet, int ) 349
  Bullet.onUpdate( int ) 282
  EntityList.update( int ) 180
  World.onUpdate( int ) 1233
  GameMode.onUpdate( int ) 392
  Game.run(  ) 629
  Thread.run(  ) 378
  

  Here is the thread for the PlayerListener

  MediaPlayer.transitionWait( int ) 540
  MediaPlayer.initialize( int, int, int, int, int, int, int, int, int, boolean, int, int, String, String, String, int, int ) 169
  StreamingMediaPlayer.initialize(  ) 615
  StreamingMediaPlayer.doPrefetch(  ) 535
  BasicPlayerImpl.prefetch(  ) 214
  PlayerImpl.start(  ) 366
  AudioChannel.playerUpdate( Player, String, Object ) 259
  BasicPlayerImpl.notifyListenersAsync( String, Object ) 195
  PlayerNotifyListenerThread.run(  ) 94
  

  Looks like I'll have to ship this game with special options.

  If you see swimming colours everywhere in the field because of the broken fog?  Select this check box.
  The tracks on the tanks move? Suppose your texture matrix support is not so hot. Select this check box.
  The game is sometimes crash when the sound effects are on?  It's true, check this box.

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