Get a static reference to decoration

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• a static reference to a URL object

  I want to create a final static reference to an instance of URL:

  public class SomeClass {
    static final URL rooturl = new URL(stringA); // fail. an exception is thrown but not caught.
    ...
  }

  If I do not end rooturl, then it works:

  public class SomeClass {
    static URL rooturl;
    static {
      try {
        rooturl = new URL(stringA);
      } catch(Exception e) {...}
    }
    ....
  }

  I'm ok with the help of the solution of the static initializer block.
  But I would like to know how to create a final static reference to an instance of a class whose every constructor throws an Exception.

  I won't read all of this code, because it is irrelevant to the question I think you, and stuff on the newspapers and magazines is also irrelevant.

  Your first post properly reflected your problem, I think.

  public class Foo {
    private static final URL url = new URL("a://b.c"); // Your question is: What do I do if new URL() can throw a checked exception?
  }
  

  Here's the thing. When you say static private final URL url, you tell the compiler that the url variable must be assigned a value when your class loading. Now, as you saw, you can throw a checked exception to a static initializer, but that's OK, you can just wrap in the Unchecked exception, ExceptionInInitializerError, like I showed you. That's what this course is aimed at the:

  public class Foo {
    try {
      private static final URl url = new URL("a://b.c");
    }
    catch (MalformedUrlExeption e) {
      throw new ExceptionInInitializerError("Could not create URL", e);
    }
  }
  

  It is a correct approach. You have already decided that this value must be initialized at class load - your class requires time in order to do its job, or if you have asserted. So if the URL cannot be created, this class can't do his job, then he expected to fail to load.

  If you makes it not final, then your catch block can log the error, instead of throwing. Do you understand why? This is because the final member variables must be initialized before that code can go further. Throw the uncontrolled exception means that code is not go any further, it's legal. And for a variable not final, it is not necessary to have a value, then you can simply log in and continue.

  HOWEVER, suppose make you no final, record a message and continue. Now what?

  Your code continues as if everything is fine, when in fact, he's not fine. Catch the exception did not have the problem go away, and to raise once again does not, your code has no idea that something was wrong. So when you get to the point where you try to use the URL, you will get a NullPointerException. Then what? You catch that, record and continue as if everything goes well?

  Some point to actually deal with the fact that an error has occurred. Does not simply continue on as if all goes well. If you have one) offer some State assistance or operation that takes the place of the problematic code (almost never a good approach), b) again, or c) propagate the error to the caller and let him face (usually approach correct).

• static reference with the global variable

  Hi, I used a static reference to a Subvi where I change a global variable before (3-4 years ago) and do not remember how I did it.

  It was something like these attachments, but now I'm using LabView 2013 instead of LV 8.6.

  The change in the overall operating system sees only not in the main vi (looks like the invoke node run vi does not work with globals).

  In addition the vi close with the invoke node close vi but not if I put the custom in the Subvi properties to automatically close.

  dkfire wrote:

  Why not call the sub vi as usual, just with the setting to display the front panel, when it is called?

  Use the connector pane to transfer the value of the sub vi Ok button when done.

  That's what I recommend.  If this is not possible for some reason, then you will need to use a flat Structure of the sequence to force the reading of the global variable after the Subvi is complete.

• How to use a static reference to maintain a VI in memory, but then call it in parallel?

  Hi all

  I have a MainVI and I want to call him a Subvi in parallel so that I can have both windows open and sensitive at the same time.  The Subvi can be closed and then reopened any number of times, but only one in existence at the same time.  I know how to do it using the reference VI opened, offering a path relative to my Subvi, check to see if its already running and if so bring window to front (using front panel: open with entries True/Standard method) and if not run it using the Invoke method: Run (and eventually open its façade by program).  This method worked very well.

  Now, I've added functional global variables in my Subvi, and I want to keep in memory inbetween opening Subvi window.  I can do this by placing a copy of the functional overall in my MainVI, even if I do not here for nothing.  It works very well.

  By chance, I came across a reference to a static reference of VI, which resembled a great improvement in my method, for the following reasons:

  1) Subvi keeps in memory all the time, eliminating the need to put the functional overall in MainVI when it is not used it.

  (2) tells the LabVIEW to include the Subvi when I build my executable, rather than me having to specifically mark as always include in the build specification.

  (3) eliminates the need to continue the path and the name of Subvi updated in a constant string in my code, in order to use the open VI reference.

  However, in trying to implement this solution, I ran into the problem that once you put a reference of VI in strictly typed static (strict typing is necessary to keep in memory) on the block diagram, that VI is reserved for execution.  This means that I can't run it using the Invoke method: Run.  I did not just put it on the diagram directly as a Subvi because I need it to run in parallel to the MainVI.  I searched through these forums extensively, and although there are several references to a static reference of VI, none of them say explicitly how to actually run this 'thing'!  : PEI

  I greatly appreciate any insight into my problem.  If I have to go back to the old way it works perfectly, but I really like the apparent elegance of this solution.  I hope that it will be technically possible, and I'm not bad understand something.

  Thank you for your help,

  -Joe

  
  

• Static reference of VI VI reentrant

  Is it possible to use a static reference of VI to dynamically launch a VI on the way home?

  I found this old post, http://forums.ni.com/ni/board/message?board.id=170&message.id=120367, the user can find a work around, but it of ugly, isn't it

  The last snapshot in your link shows the best way to invoke an instance of a reentrant VI dynamically. The only thing I would change from that is to use the Name of VI property instead of the Path of VI property to wire open VI return. You can simply use the name of VI if the VI is in memory, which is more effective. Since you have a static reference of VI, the VI will certainly be in memory.

  I agree that it's a bit ugly. Personally, I created a Subvi to hide the ugliness and make him feel more simple!

• VI static references in an application using

  Hello to you all, useful forum fans!

  I use 4 different static references of VI hung directly to "Run a VI" invoke nodes, with the waiting "until" and settings "Auto have Ref" both false, run the four screws dynamically, which each does nothing except call my serial port returning from input/output VI with a different index of COM port number.  Overall it works pretty well.  However, I have a few questions concerning the improvement of my installation.

  (1) is it possible to somehow set an input parameter to the serial port environment VI and thus be able to invoke it directly four times in a loop for, each with a different input value?  I don't know how I would do that, except that I heard that you can set the value of a control on a VI by using a reference to it.  I also fear that the use of the same reference VI static to invoke the VI 4 times somehow re - start the same instance of dynamic VI 4 times, instead of spawning 4 copies of it.  However, this solution would allow me to remove the 4 screws that do nothing except call the reentrant VI, and my code would be simpler and more extensible (e.g. making it easy to interact with 8 ports in the future series just by increasing the number of for the iterations of the loop).

  (2) it seems to be necessary for me to add the 4 screws that I dynamically invoke in my lvproj file and add to the section "Still included" my generation of application properties in so that they can be included in the executable file of my application.  It was what I had to do in previous versions of my code when I've referenced via a path on the screw name, but now I've changed using static references of VI, I thought they would be included automatically.  LabVIEW already knows to automatically load them into memory (for example, when I do a search it finds them even when they are not open), and they are included in the list of dependencies in the LabVIEW project, so why they would be built to my executable?  I would prefer not to have to add explicitly, as it is one thing to forget if I change it in the future.  Is there a setting or something somewhere that I can change so that they will be included in the executable file automatically?

  I thank very you much for your time and your help as always!

  -Joe

  Hey Joe,

  Answer to Q1: Yes.  Wire one '8' (type of data I32) entry 'options' function 'open VI Reference.  This indicates 'Reference open VI' that the VI is re-entrant.  It will look like this:

  

  Use the resulting table of references to follow your screws laid throughout the rest of your application.  Don't forget to close them when you are finished with them.

  For the 2nd quarter... I certainly built executables by using code similar to what I show above and did not have to explicitly include the screw called statically in the build.  You're right, they should be automatically included in the compilation - mine were always, including modules that reside in a different lvproject (called by a main control VI).  Sometimes I felt it necessary to develop modules in a lvproject and then call them from different main screws that reside in other projects.  If I used a static reference, they are always included.  What LV version do you use?

• Static instead of sound - whenever I'm playing the sound, all I get is static

  Whenever I'm playing the sound, all I get is static, if the volume is 100 or 5. What can I do to recover my sound?

  Hello

  1. what operating system do you use?
  2. you use headphones?
  3. the problem happens on the speakers and the headphones?

  Check what operating system you are using. See the link below:
  http://Windows.Microsoft.com/en-us/Windows7/help/which-version-of-the-Windows-operating-system-am-i-running

  If you use Windows 7, then follow these steps:

  
  Step 2: try using the troubleshooting of Audio playback and check if it detects the problem.

  To open the troubleshooter of Audio playback:
  a. click the Start button and then click Control Panel.
  (b) in the search box, type troubleshooting and then click Troubleshooting.
  c. under hardware and sound, click on the audio playback problems.
  d. follow the instructions contained in the resolution of the problems.

  Refer to this article:
  http://Windows.Microsoft.com/en-us/Windows7/open-the-playing-audio-Troubleshooter

  
  Step 3: disable the optional speaker effects that are known as improvements and test

  Follow the steps below to disable the improvements:
  a. Click Start, and then go to the control panel.
  b. click sound.
  c. Select the playback tab.
  d. Enter select speakers/headphones
  e. click Properties
  f. Select enhancements tab
  g. disable all improvements
  h. restart the computer

  Refer to this article for help:

  Tips for solving common audio problems
  http://Windows.Microsoft.com/en-us/Windows7/tips-for-fixing-common-sound-problems

  Kind regards
  Afzal Taher
  Microsoft technical support engineer

• How to get a static Image location (Lon & Lat)

  Hi, I have a location (long & Lat),

  How to get a static Image of these data?

  Thank you

  JAM373 blackberry jam europe reading

  and

  http://supportforums.BlackBerry.com/T5/native-development/crush-in-BB-Cascades-imageView-SetImage/m-...

  Found the solution using MapImageGenerator

  I am applying like this

  on .qml:

  function getImage() {
     mapImage.getImageMap(lat, lon, screenWidth);
  }
  
  attachedObjects: [
     StaticMapImage {
       id: mapImage
       onGetProperties: {
         staticMapImage.image = aPropertyMap.img;
       }
    }
  ]
  
  ImageView {
     id: staticMapImage
     preferredWidth: screenWidth
     preferredHeight: 300
  }
  

  on StaticMapImage.cpp:

  StaticMapImage::StaticMapImage(QObject *parent):
      QObject(parent)
      {
  
      }
  
  void StaticMapImage::getImageMap(const double &aLatitude, const double &aLongitude, int width)
      {
      ViewProperties mapProperties;
      mapProperties.setLatitude(aLatitude);
      mapProperties.setLongitude(aLongitude);
      QRect windowRect(0,0, width, 300);
      mapProperties.setWindow(windowRect);
  //  mapProperties.setAltitude(500);
  
      iMapImageGenerator = new MapImageGenerator(mapProperties);
      bool result = connect(iMapImageGenerator,
              SIGNAL(finished(bb::cascades::maps::MapImageGenerator *)),
              this, SLOT(imageFinished(bb::cascades::maps::MapImageGenerator *)));
      Q_ASSERT(result);
      Q_UNUSED(result);
  
      iMapImageGenerator->start();
      }
  
  void StaticMapImage::imageFinished(bb::cascades::maps::MapImageGenerator *aMapImageGenerator)
      {
      bb::cascades::Image img(aMapImageGenerator->imageData());
  
      QDeclarativePropertyMap* propertyMap = new QDeclarativePropertyMap;
      propertyMap->insert("img",  QVariant(QVariant::fromValue(img)));
      setProperties(propertyMap);
  
  //  delete iMapImageGenerator;
      }
  
  QDeclarativePropertyMap *StaticMapImage::properties()
      {
      return iPropertyMap;
      }
  
  void StaticMapImage::setProperties(QDeclarativePropertyMap *aPropertyMap)
      {
      iPropertyMap = aPropertyMap;
      emit getProperties(iPropertyMap);
      }
  

  on StaticMapImage.hpp:

  class StaticMapImage: public QObject
  {
      Q_OBJECT
      Q_PROPERTY(QDeclarativePropertyMap *properties READ properties WRITE setProperties NOTIFY getProperties)
  public:
      StaticMapImage(QObject *parent = 0);
      Q_INVOKABLE void getImageMap(const double &aLatitude, const double &aLongitude, int width);
  
  private slots:
      void imageFinished(bb::cascades::maps::MapImageGenerator *aMapImageGenerator);
  
  public slots:
      QDeclarativePropertyMap *properties();
      void setProperties(QDeclarativePropertyMap *aPropertyMap);
  
  signals:
      void getProperties(QObject *aPropertyMap);
  
  private:
      MapImageGenerator *iMapImageGenerator;
      QDeclarativePropertyMap *iPropertyMap;
  };
  

  Thank you

• When you try to use the texture of the paper adobe pro, I get: error a reference to a file / folder: 104

  When you try to use the texture of the paper adobe pro with CC2015, I get: error a reference to a file / folder: 104

  left Adobe Creative Cloud for General Photoshop Discussion

• MuseJSAssert:Error calls the function selection: TypeError: cannot get the "init" reference to undefined property or no, I am a beginner and not able to solve this problem with my website, please help...

  Everytime I open my site I get this error "MuseJSAssert: Errot calling function selection: TypeError: cannot get the"init"reference to undefined property or null" and I was a newbie am not able to solve this problem.

  

  I did take all measures please help.

  Hello

  Can try you it on another browser that the problem does not come up on top of our end.?

  Kind regards

  Akshay

• Is it gets adds a reference as a member of a user class?

  Hello

  Everything is in the title

  I would like to know if I can get a reference to an object in a class member? I created a class that obtain information of a material. I want to "point" a digital display for each class.

  Thank you very much.

  Dominique

  Yes, you can. You will need a VI accessor that sets the benchmark in the class to refer to an element of real façade.

• Get FrontPanel control references via ActiveX

  Hello

  I tried to get the references to controls frontpanel via LabVIEW ActiveX Server, equivalent to the LabVIEW code:

  

  but I can't find the ActiveX methods / propertis to use.   Is there a way to do this?

  / LeifS

  The ActiveX Automation Server interface to the LabVIEW VI server exposes only a very small subset to the real VI LabVIEW server. Basically, it's enough to load and run special and pass the values to the controls on the front panel by name, but that's all.

  The reason is twofold. When VI Server was introduced in around LabVIEW LabVIEW 5.0, it was especially exposed total VI server functionality. He was not at all script and controls only limited access to the hierarchy of the objects of the façade. Even in this case the ActiveX interface not only exposes all methds and VI server properties, in part because exposure of LabVIEW internas would have required a vast typelibrary ActiveX, in part because it was not a major concern to be able to do more than launch screw through it. It was better than the DDE interface already by a long stretch.

  VI server was then extended in later versions, but the ActiveX interface was really changed much, also because Microsoft had .net and declared the exaggeration of the ActiveX from a few years earlier to be discouraged anyway.

• Cannot get internet static IP address

  Hi, I put several new Win7 PC in an office that replace Win XP PC. I need to use static IP addresses on all of the PCs, as it is required to access the Unix server. Start of the new PC with internet access very well, but when I assign static IP addresses, they have more internet. My IP address, DNS server, gateway, etc. are all correct and identical to what is plugged into the PC XP (except IP address of course). Even if the new PC do not have internet access, they can connect with the Unix server and other PCs on the working group. When I diagnose the problem I get the answer: "your computer seems to be configured correctly, but the device or resource (DNS server) is not responding." All the XP computers using the static IP address and have the internet very well. Yes, I already tried to clear the DNS cache.

  Hello

  As you work on a domain network, the question would be better suited on the TechNet support forum.

  I suggest you to check with TechNet support for more information.

  http://social.technet.Microsoft.com/forums/en-us/newThread?category=&Forum

• Get a static noise when using the sound track

  I just Adobe Premiere Clip, thanks to Kevin, because he was talking on his vlog every day lol.

  I managed to make a little video, photos of stil, and I work very well, but when I announced a soundtrack, all I hear is static noise, seeing the video, in the first video, but when I save the video and read it, then it sounds very good.

  I use Adobe Premiere Clip version 1.1.2.1161 on Android version 6.0 on a Sony Experia E5

  I understand now.

  I will ask to confirm the media audio information.

  You can use the MediaInfo application which will help you to get all the information about this Audio clip. (https://mediaarea.net/en/MediaInfo/Download this application specifically runs on desktop computers)

  Also, let me know the source of this Audio file.

• Edge Animate error: cannot get goods 'set' reference undefined or null

  I don't know why I'm getting an error 'could not get property "set" of reference undefined or null' when I insert into my edge Animations through Javascript in containers on my page.

  
  

  The error is emitted by version CDN (minimized) runtime at the following address: line: 97, column: 245 Any idea why this would be greatly appreciated! Thank you.

  It seems that this question was because I included the "xxxx_ege.js" file in the head. Who shot, first of all, even before I needed to load in the composition, because he wasn't in sight yet. So I just removed those file and it took these issues.