Global variable problem using as reference file

Similar Questions

• Loading a file into a global variable problem - really a global var text?

  Of all the documentation and the examples that I can find, it seems that it would be

  fix to create a global table [outside any function] variable to load image names

  then use these images to a slide show. I want to do the dynamic application, modify the text file as a new series of images.

  The global variable passes zero [any value] after the load event listener. Why is this?

  Is not global and world alive for the duration of the SWF?

  PARAMS. TXT:

  monthNames = January, February, March, April, may, June, July, August, September, October, November, December of & dayNames = Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday

  CODE:

  var dNames:Array = new Array();
  var mNames:Array = new Array();
  var request: URLRequest = new URLRequest("images/params.txt");
  variable var: URLLoader = new URLLoader();
  variables.dataFormat = pouvez;
  variables.addEventListener (Event.COMPLETE, completeHandler);
  Try
  {
  variables. Load (request);
  }
  catch (error: error)
  {
  trace ("unable to load URL:" + error);
  }
  trace ("2 mNames 2:" + mNames [2]);
  trace ("2 dNames 3:" + dNames [3]);
  Stop();

  function completeHandler(event:Event):void
  {
  var loader: URLLoader = URLLoader (event.target);
  dNames = loader.data.dayNames.split(",");
  mNames = loader.data.monthNames.split (",");
  trace (Loader.Data.DayNames);
  trace ("1 mNames 2:" + mNames [2]);
  trace ("1 dNames 3:" + dNames [3]);
  }

  OUTPUT:

  2 mNames 2: undefined
  2 dNames 3: undefined
  Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday
  1 mNames 2: March
  1 dNames 3: Wednesday

  How to access these values after the loading of the external file, after charging?

  Thanks in advance.

  The statement you quoted all Adobe documentation is correct.

  If you want to load the data into the tables before anything else happens, then have everything that happens to run via the function completeHandler... when the data is loaded and processed in the tables.

  the command: loadFile() runs before the trace ("2:" + images [4]); command.  The loadFile function is processed and loading process BEGINS... but begins loading does not delay the main treatment to continue down the line - the loading itself becomes a secondary/background task.  The order was to run the function loadFile and the processing of this function has been completed.  If you don't believe, then add a trace...

  function loadFile (): void

  {

  vars.dataFormat = pouvez;

  vars.addEventListener (Event.COMPLETE, onComplete, false, 0, true);

  Vars.Load (new URLRequest("images/fnames.txt"));

  trace ("implementation");

  }

  If you add this trace, you will see the execution of function loadFile is completed and the following line in your code is then treatment... trace (2...)

  The addEventlistener method does not stop anything.  The addEventListener method code is assigned a monitor, not a traffic controller... it's say the monitor to indicate when the loading data are complete.  It does not do anything to stop the execution of the program.

  So if you want to wait until the data is loaded before anything else... it goes...

  function onComplete(evt:Event):void

  {

  var urlVars:URLVariables = evt.target.data;

  images = vars.data.images.split(",");

  tnails = vars.data.thumbnails.split(",");

  ................ HERE.................

  }

• With the help of semaphore with a Global Variable - correct use?

  Hi all

  I looked in the use of global variables and in my case, it seemed with the help of a semaphore is the appropriate solution.

  In my case, I use a global variable to store the State of the system. Asynchronous two with screw environment (same VI) will follow two COM ports to see if they get a ' login:' command prompt. If the COM port is associated with Alpha, Charlie, or Echo, it increments by 1, and if it is associated with the Bravo, Delta, or Foxtrot, is incremented by 2 GV. If the GV is 3, the rest of the code will run. In this case, it must be a port COM A, C or E; the other should be B, D or F.

  A VI parent is called inside a loop. He works for the first loop. He never adds up to 3 on the second loop, however. I can't understand why. Please let me know if my code is a poor use of semaphores, or if there is debugging I can try.

  I'm still relatively new to LV, so I'm sorry if my screws are difficult to read. I created this in LV2011.

  Thanks for any help!

  CelerityEDS wrote:

  The output of my time looping (wait GV = 3) goes to the structure of the case on the bottom right (clear SGS, PasswordEntry, etc.), so the GV get indeed consulted by the upper case structure right.

  ??

  Your right upper case structure does not run until your time ends in a loop.  The while loop does not stop until the total is equal to 3.  Where can increment you the world besides structures case you cannot yet?

  Have you tried in your point culminating execution of the VI in order to see how they are actually running?

  Another problem that I see.  Assuming that your first while the loop is going to end.  In the structures of your case, you lock the semaphore.  But you can never unlock the semaphore unless you have the right combination of conditions that allow you to get to the case that unlocks the semaphore.  The conditions are based on data that are read before the start of the case of structure, which means that data will not be read and changed until it all ends.  You have the timeout of your lock semaphore connected on one of the cases, but your semaphore lock can never timeout because you do not have a value on his entry time-out.  I think you have a situation where you can lock a semaphore, then arrive at a situation where you can not unlock, then wind locking up of your cold code.

  I don't really think that you need a semaphore at all.  I think you can protect reading and writing functional your overall using a global variable, i.e. the motor action.  Overall, I think you need to rethink the architecture of your code.

• How to set global variables for use by all THE #subform [0] items of form1. ?

  Hi all

  I don't know how to code javascript but am new to Adobe LiveCycle.  When I open the script editor, I have the following code (the code is in United Nations in bold):

  -form1. #subform [0]: initialize :-(FormCalc, client).

  //////////////////////////////
  TO START: SET GLOBAL PRICES.
  //////////////////////////////

  var Cityscope_Sydney_CostUser1 = 60,39;
  var Cityscope_Sydney_CostUsers2to5 = 3.02;
  var Cityscope_Sydney_CostUsers6to20 = 1.21;
  var Cityscope_Sydney_CostHardCopyWithOnline = 14.59;
  var Cityscope_Sydney_CostHardCopyWithoutOnline = 54,67;
  var Cityscope_Sydney_CostHardCopyAdditional = 14.59;

  var Cityscope_NorthSydney_CostUser1 = 48,40;
  var Cityscope_NorthSydney_CostUsers2to5 = 2.42;
  var Cityscope_NorthSydney_CostUsers6to20 = 0.97;
  var Cityscope_NorthSydney_CostHardCopyWithOnline = 14.59;
  var Cityscope_NorthSydney_CostHardCopyWithoutOnline = 43,54;
  var Cityscope_NorthSydney_CostHardCopyAdditional = 14.59;

  
  ////////////////////////////
  END: SET GLOBAL PRICES.
  ////////////////////////////

  -form1. #subform [0]: enter :-(FormCalc, client).

  -form1. #subform [0]: output :-(FormCalc, client).

  -form1. #subform [0]: calculate :-(FormCalc, client).

  -form1. #subform [0]: validate :-(FormCalc, client).

  -form1. #subform [0]: preSave - (FormCalc, client).

  < < = etc etc etc = > >

  -form1. #subform [0]. Item1Cost::initialize :-(JavaScript, client).

  -form1. #subform [0]. Item1Cost::enter :-(FormCalc, client).

  -form1. #subform [0]. Item1Cost::exit :-(FormCalc, client).

  -form1. #subform [0]. Item1Cost::calculate :-(JavaScript, client).

  Store the values of the form of friendly names.
  var AreaSelected = Item1Area.rawValue;
  var NumberOfUsersSelected = Item1Users.rawValue;

  Declare other variables.
  var Users1Calculation;
  var Users2to5Calculation;
  var Users6to20Calculation;

  
  Calculate the cost to the "components" user will depend on the number of users selected for the region.
  Switch (true)
  {
  If (NumberOfUsersSelected < 2):
  Users1Calculation = NumberOfUsersSelected * Cityscope_Sydney_CostUser1;
  Users2to5Calculation = 0.00;
  Users6to20Calculation = 0.00;
  break;
  If (NumberOfUsersSelected > 1 & & NumberOfUsersSelected < 6):
  Users1Calculation = Cityscope_Sydney_CostUser1;
  Users2to5Calculation = (NumberOfUsersSelected - 1) * Cityscope_Sydney_CostUsers2to5;
  Users6to20Calculation = 0.00;
  break;
  If (NumberOfUsersSelected > 5):
  Users1Calculation = Cityscope_Sydney_CostUser1;
  Users2to5Calculation = 4 * Cityscope_Sydney_CostUsers2to5;
  Users6to20Calculation = (NumberOfUsersSelected - 5) * Cityscope_Sydney_CostUsers6to20;
  break;
  by default:
  Alert ("BROKEN: calculate the individual components of cost of use will depend on the number of users selected for the region.");
  }

  apply the total cost for this article
  Item1Cost.RawValue = Users1Calculation + Users2to5Calculation + Users6to20Calculation;

  -form1. #subform [0]. Item1Cost::validate :-(FormCalc, client).

  -form1. #subform [0]. Item1Cost::MouseEnter :-(FormCalc, client).

  -form1. #subform [0]. Item1Cost::mouseExit :-(FormCalc, client).

  -form1. #subform [0]. Item1Cost::change :-(FormCalc, client).

  -form1. #subform [0]. Item1Cost::full :-(FormCalc, client).

  -form1. #subform [0]. Item1Cost::MouseUp :-(FormCalc, client).

  -form1. #subform [0]. Item1Cost::MouseDown :-(FormCalc, client).

  -form1. #subform [0]. Item1Cost::click :-(FormCalc, client).

  -form1. #subform [0]. Item1Cost::preSave - (FormCalc, client).

  -form1. #subform [0]. Item1Cost::postSave - (FormCalc, client).

  -form1. #subform [0]. Item1Cost::prePrint - (FormCalc, client).

  -form1. #subform [0]. Item1Cost::postPrint - (FormCalc, client).

  -form1. #subform [0]. Item1Cost::preSubmit:form - (FormCalc, client)-

  -form1. #subform [0]. Item1Cost::docReady - (FormCalc, client).

  -form1. #subform [0]. Item1Cost::docClose - (FormCalc, client).

  -form1. #subform [0]. Item1Cost::ready:form - (FormCalc, client)-

  -form1. #subform [0]. Item1Cost::ready:layout - (FormCalc, client)-

  -form1. #subform [0]. Item1Users::initialize :-(FormCalc, client).

  -form1. #subform [0]. Item1Users::enter :-(FormCalc, client).

  -form1. #subform [0]. Item1Users::exit :-(FormCalc, client).

  -form1. #subform [0]. Item1Users::calculate :-(FormCalc, client).

  -form1. #subform [0]. Item1Users::validate :-(FormCalc, client).

  -form1. #subform [0]. Item1Users::MouseEnter :-(FormCalc, client).

  -form1. #subform [0]. Item1Users::mouseExit :-(FormCalc, client).

  -form1. #subform [0]. Item1Users::change :-(FormCalc, client).

  -form1. #subform [0]. Item1Users::full :-(FormCalc, client).

  -form1. #subform [0]. Item1Users::MouseUp :-(FormCalc, client).

  -form1. #subform [0]. Item1Users::MouseDown :-(FormCalc, client).

  -form1. #subform [0]. Item1Users::click :-(FormCalc, client).

  -form1. #subform [0]. Item1Users::preSave - (FormCalc, client).

  -form1. #subform [0]. Item1Users::postSave - (FormCalc, client).

  -form1. #subform [0]. Item1Users::prePrint - (FormCalc, client).

  -form1. #subform [0]. Item1Users::postPrint - (FormCalc, client).

  -form1. #subform [0]. Item1Users::preSubmit:form - (FormCalc, client)-

  -form1. #subform [0]. Item1Users::docReady - (FormCalc, client).

  -form1. #subform [0]. Item1Users::docClose - (FormCalc, client).

  -form1. #subform [0]. Item1Users::ready:form - (FormCalc, client)-

  -form1. #subform [0]. Item1Users::ready:layout - (FormCalc, client)-

  .. and so on and so forth...

  In short, I want the code in:

  -form1. #subform [0]. Item1Cost::calculate :-(JavaScript, client).

  .. .to be able to access the variables I created in:

  -form1. #subform [0]: initialize :-(FormCalc, client).

  
  (I guess that's where I store global variables)

  At this point, global variables are not accessible with the above configuration.  Was the only one I can get this working is to cut and paste the Globals in each item of form1. #subform [0], which of course defeats the purpose of global variables!  I intend to have a lot more items so wouldn't duplicate global variables for each of them!

  Can someone show me how to do this?

  Any help is very appreciated!

  Thank you

  Stanbridge

  Post edited by: stanbridgej - colors and fonts or not will not save.  Are bolded my question make (non-fat) code easier to read (I hope).

  I haven't used Formccalc, but I thought it would be the same regardless. Insert a script object to the top of the hierarchy and call it, for example "sco." Paste the Globals. Then refer to variables of the extent that sco. Cityscope_Sydney_CostUser1, etc. Make one

  App.Alert (sco. Cityscope_Sydney_CostUser1);

  one of the fields. If the debugger is activated, it will tell you if it cannot resolve the reference as "sco. In this case, you may need to use the som expression to reference the script object, for example

  var scoScript = xfa.resolveNode ("topOfHierarchy.sco");

  scoScript.Cityscope_Sydney_CostUser1

  But if as close as possible to the top of the hierarchy above should work.

• global variable problem

  Hi all
  
  If I use this SELECTION 'C ' | myCodes. NEXTVAL INTO: ins2.code FROM DUAL; the trigger for insertion prior to the global variable does not work for this field: ins2.code...
  
  But if I use the validation key work but I want to use on insert before
  
  Here's my trigger validation key codes
  
  Start
  
  SELECT 'C ' | myCodes. NEXTVAL INTO: ins2.code FROM DUAL;
  If
  : ins2.name is not null
  then
  : global.name: =: ins2.name;
  : global.code: =: ins2.code;
  commit_form;
  end if;
  end;
  
  
  Please help me thanks in advance
  
  
  Sarah
  
  Published by: SarahSarahSarah on September 7, 2009 06:41

  Hi Sarah!

  The before insert trigger is triggered just at the moment where you call the commit_form build-in.
  So: ins2.code and: ins2.name are always set to null when you attempt to assign values to the globals.

  Place the code inside the direct trigger of prior insertion after the sequence - select.

  if
    :ins2.name is not null
  then
    :global.name := :ins2.name;
    :global.code := :ins2.code;
  end if;
  end;
  

  and the relaxation of the validation key:

  if
    :ins2.name is not null
  then
   commit_form;
  end if;
  end;
  

  or assign the values to the globals after the call to the commit_form build-in:

  if
    :ins2.name is not null
  then
    commit_form;
    :global.name := :ins2.name;
    :global.code := :ins2.code;
  end if;
  end;
  

  Concerning

  Published by: Magoo on 07.09.2009 13:47

• Get local and global variables using API

  Hi, I do in LV a Publisher for TS. The user should be able to change the value of global variables and the inhabitants of file. Using the TS API, it is possible to get all files of Globals and locals without knowing the name of these variables have ts? I mean, if I knew the name I could use the value of property Get with the search string. But if the I do not know the name of the variable, can I get the list (and their values) of the variable?

  Thank you very much.

  Try the following link

  http://forums.NI.com/NI/board/message?board.ID=330&message.ID=3390&query.ID=6624776#M3390

  In summary:

  Use the GetNumSubProperties method to get the total number of inhabitants / FileGlobals.

  Use GetNthSubProperty to get sub properties using the index starting with 0 to GetNumSubProperties-1

  Use the Name property to get the name of the subproperty.

  Concerning

  Ray Farmer

• How to use the global variable in the table target?

  Hello

  I am trying to load several files into a single interface. the data is loaded successfully. 92. the files are there. for this I used variables and package.

  My requrement is 92 files of data loaded into the target table. I want to know what data from file.

  to this I added a column (filename) to the existing target table.

  If I used joints (not same condition), its totally wrong. all file names are coming.

  Please see the following screenshots.

  

  exit; target table.

  

  in fact in the target table. first 10 lines are coming from file.i.e first _ACCOUNT_LIMIT_511.TXT. but all the files names are coming.

  I'm confuse. After the first data file inserted then insert second data file. in that all file names are coming. Please help me.

  I thought that the global variable is preferable to identify the data came from which file.

  to do this, the global variable is used in the target table. I don't always have my exit.

  Please help me.

  Thanks in advance.

  

  Hello

  You can use the same way, how you use the project variable, just you have to do a thin is #GLOBAL.variable_name for example: #GLOBAL. SMART_AL_FILE_NAME_S

  Note: Make sure you that while you use one variable overall in interface, indicator should be staged as you chose above the screen

  hope this helps you

  Kind regards

  Phanikanth

• Addition of new global variables

  I change code that uses one or more global variables in a global folder of vi. I would like to add a few variables more and potentially change what exists and ask them to be in the same globals vi. I can easily add a variable of the same type by copying and pasting a variable of the same type on the Panel before the globals vi, but I can't add variables of different types.

  This post comes closest: http://forums.ni.com/t5/LabVIEW/how-to-associate-existing-global-variables/m-p/1079535/highlight/tru... but I did not understand this line:

  • Add FP (there may be several elements in a global variable VI)

  I read some of the warnings against the use of global variables as it can cause race conditions / lead to General illegibility. I'm curious what is recommended if global variables are used as the constants that are defined at the beginning of the program. In general, my LabVIEW code gets pretty unreadable if I have a lot of threads for all of these constants. Is there something better?

  Thank you!

  Kristen

  Hello kllurie,

  The scenario you mentioned (using globals to replace duplicate constants) is probably the best use cases for them - conditions of race etc. problems arise when they are used to the stream or in several scenarios of the writer.  Readability is perhaps a matter of concern, because it is not immediately clear what could be reading from or writing to a global when a thread would suffice.

  With regard to the modification of the globals vi, all you need to do is drop objects on the front of the range of controls (right click).

  Kind regards

• APEX 4.2 translate data 'function and Global Variable declaration '.

  Hello everyone,
  
  I use APEX 4.2.1.00.08 and I wonder if there is a way to translate "Function and Global Variable declaration" textarea. Any other script text box is available for translation, but not this one.
  I know what the code is loaded on the header, but may contain important alert messages of global functions.
  
  Thanks in advance.

  Hi Grandmaster,

  "Function and global variables declaration" contains the JavaScript code, that is why it is not wise to include in the standard translation process.

  In my opinion, you have several options to access your translated messages:

  -) Use Application-> Substitutions or
  -) Store your message in the form of component shared-> SMS and and assign it to an application with the APEX_LANG element. Api MESSAGE (http://docs.oracle.com/cd/E37097_01/doc/doc.42/e35127/apex_lang.htm#CHDBCEAB)

  In 'Function and Global Variable declaration' use substitution syntax to replace the value. For example:

  var myDeleteMessage = "&G_MY_DELETE_MESSAGE.";
  ...
  alert(myDeleteMessage);
  

  where G_MY_DELETE_MESSAGE would be a part of the application or the request for Substitution.

  Concerning
  Patrick
  -----------
  Member of the APEX development team
  My Blog: http://www.inside-oracle-apex.com
  APEX Plug-Ins: http://apex.oracle.com/plugins
  Twitter: http://www.twitter.com/patrickwolf

• Apex user as Global Variable

  Hello
  
  Is it possible to catch the Apex user in the system or the Global Variable to use for checking for example
  
  Br.
  
  MDK.

  Hello

  There's the substitution APP_USER string
  http://download.Oracle.com/docs/CD/E17556_01/doc/user.40/e15517/concept.htm#sthref166

  I hope that's what you're looking for

  Kind regards
  Jari

• Using global variables in a device custom

  Hello world

  I have problems with the passing of data through my device customized using global variables. I want to allow a user to select a RIO device address when you set up the system definition file. This is recorded in a global variable using the hand Page VI. I would later use this RIO device address in RT driver to deploy a bitfile. I can hard-code, but it is much more convenient to use a global.

  When I try to store the address of the global variable, it updates the value temporarily (I confirmed that the structure of the event recognizes the change of value). When I click the node of the tree to define system linked to the Main Page VI and then click on it again, the hand Page VI runs again. I wrote the code to repopulate the address of device of RIO with the last value stored in the global variable, but it is empty. I've included the VI global variables in my build, so I can't imagine why it can reset this value.

  Any help would be appreciated!

  Thank you

  Mitch

  Have you tried to use the custom device properties to store this value instead of GVs?

  Configuration VI, you can set this property, and if I'm not mistaken, you can read these properties on the RT driver.

• Functional Global Variable reference

  Hi all

  I want to update the value of the indicator element in primary VI, I don't want to use the global variable, due to the problem of race condition. So I create a functional global variable to control reference. It is reliable and can avoid the race condition critical?

  I have attached two Test VI.

  Thanks for your advice.

  Personally, I use user events to send data to the main VI and then he can update the indicator.  This generally works very well since most GUI screws using a Structure of the event anyway.

• global variables for the XML plugin problem

  Hello world

  recently I started working on a dialog box SOUTH, where the user can load the *.xml files in DIAdem.So much my code for the button looks like this:

  ....

  Call the FileNameGet ('ALL', 'FileRead","*.xml")
  Call DataFileLoad (FileDlgName, "XML_Plugin", "Load")

  ....

  And I must say that it works very well! I am able to load all listed in the devices file. BUT when I tried a number of loading devices, I used a global variable, that I defined in the vbscript file that I load the SOUTH since, I've noticed that global variables, I've defined with GlobalDim are not defined in the vbs.:mansurprised of XML_Pluging:

  Then I started to experiment and so far without success, no matter where I define global variables, in my plugin *.xml all not defined! The native commands even and DIAdem functrions does not work. If I run the script in tiara, it shows no errors, but when I use the plugin to open a file, then it gives an error. For example, MsgBox is not allowed.

  I used the plugin example for *.xml, which was published on the Web site of NOR, and I made a few changes. But overall I have it has not corrupted and I kept the same structure:

  Void ReadStore (File)

  Dim XmlFile: xmlFile = File.Info.FullPath
  '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
  'open the file '.
  OpenXMLFile xmlFile

  End Sub

  Void OpenXMLFile (xmlFile)
  '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
  ' Open MS - Xml Parser
  'Create the ActiveX object for the Microsoft XML parser.
  Dim XDoc: set xDoc = CreateObject ("MSXML2. DOMDocument.3.0")

  "Try to load the XML document
  If xDoc.Load (xmlFile) = False Then
  "Failed to load the document XML.
  RaiseError ' unable to load XML document!
  End If

  protected originalLocale: originalLocale = Getlocalte
  "SetLocale" en - us ".

  "The XML document loaded successfully!
  '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''

  '----------------------------------------------
  "Read the header information.
  '----------------------------------------------

  Here, I have read some values of the header and then I loop on all devices present in the file!

  So basically I have two subroutines and that's all.

  SetLocale originalLocale

  End Sub

  So what I am doing wrong? Why global variables and other functions do not work. Is it because there is xml code in the script this way or it's a version problem?

  I use DIAdem 10.2. If I use global variables in other vbscripts, I use to draw curves for example I have no problem. Now I'm no *.xml code and no subroutines.

  I'd appreciate any solution that will make my *.xml plugin to work.

  Hi fscommand.

  It is expected all behavior.  Use XML, as all VBScript DataPlugins, runs in a separate VBScript host of the DIAdem VBScript host.  DIAdem VBScript host adds all global variables green and Red controls global to host Microsoft VBScript standard.  Use VBScript host has its own special abilities (file object, root object), but there is NO access to Globals green or red blanket orders in the reception of DIAdem VBScript.  Your SUDialog runs in a third host VBScript, which is separated from the other two and the other two are not capabilities (command SUDialog callback functions), but the SUDialog VBScript host and VBScript tiara share all global variables green and Red orders overall.

  Normally all blue VBScript commands are allowed in all 3 VBScripts hosts, but in the case of the DataPlugins MsgBox and InputBox functions were especially restrained because the dialogues could cause a lot of trouble with the DataFinder.  In fact, they have been allowed to 9.1 tiara which was the latest version of tiara for the DataFinder appear.

  So, why do you want to pass information between the XML use and tiara?  If you want to use to share information with DIAdem, then you should just expose every piece of information as a new property in the data portal, which can read and use the code VBScript DIAdem.  The path of the XML file is already available inside the use of XML.  What other information in the call VBScript DIAdem do you need to share with the use?

  Brad Turpin

  Tiara Product Support Engineer
  National Instruments

• Why LabVIEW example projects using Global Variables?

  I'm puzzled.  I've been pretty good programmers LabVIEW talks (including some who work for the OR) and came away with the impression that Global Variables should, as a general rule, be avoided, with functional Global Variables (alias VI Globals) generally preferred for "local memory".

  I have studied some of the example distributed with LabVIEW, 2012 and 2013, in particular the proposed acquisition in real time and am struck by the use of Global Variables, where I'd be inclined to use instead a FGV.  For examples, to stop all the loops on the RT target, the overall "All the RT loop Stop" is defined; 'Constants' of configuration (such as timeouts, Streme network names, the names of the journal folder) are kept as Globals; Streme network endpoints are stored in Globals.

  [Note - there is a weird spelling of the second word of the network Streme, above - when I tried to post with the correct spelling, I got an error message saying this word is 'not allowed in this community".]  I apologize for the offense, but I must confess that I do not understand what the problem with the help of the spelling of this word...]

  Why use Globals in these cases, rather than write a bunch of VIGs to hold these data?  Note that almost all these Globals are 'Read' essentially (written once when a resource is acquired, for example) or "Read Only" (treated as if they were a constant).  Indeed, read-only variables can be written as a Subvi with only an output terminal, acting as a (visible, due to the icon) constant.

  I can see advantages to this approach.  On the one hand, VIGs can have error bounds who run the data flow (I just spotted a bug "data flow" in code, I am developing that is based on this model, to read configuration data to an XML file in a world and in the same VI, Global wiring to a "use - me" terminal, but with no guarantee that I'll read the overall after I write it).

  It is, I suppose, a matter of 'speed' - perhaps Global Variables are 'faster' than VIGs (especially if the VIG 'sits' on an error line).  My thought, however, is that this difference is likely to be trivial, especially as these VIGs (or Globals) tend to become "occasional" calls (with the exception of the indicator 'all the loop Stop' which is called once per line).

  Are there other arguments or considerations that make a Variable global to a better choice than a VIG?  Is there a reason that LabVIEW developers put in these start-up of projects LabVIEW?

  BS

  I have to ask, how do you use functional Global Variables?  Like just a Get and Set?  If so, you can use a global variable.

  Yes, globals are faster and use much less overhead.  At the summits of CLA in recent years, we talked about using globals.  The most common use is for Write-Once-Read Many and writing-never-Read Many with configuration data.  It's a good idea to use globals with the constants that can change on you.  It turns out that the world will have the same performance as a constant in this case.  This is done so that you don't have 1 place to edit the 'constant '.

  The rule on "Globals are evil" actually goes back several years when NEITHER had the huge "people of the country are bad" vendata.  But NEITHER explains well how to do things properly.  So I found people, instead of using local variables, using the value property node.  It's even worse because the property causes thread swaps and kills your performance.  It wasn't until I shouted to people to use wires and shift registers I have seen improvements in the way in which people wrote their code.  So people are always riffling in the use of globals and decided to use FGVs with the EEG and fixed rather cases.  But this does not solve the problem of the conditions of race with critical data and you cause an additional burden.

  So from my experience, I use globals all the time for configuration data.  Yes, you must be careful about the race conditions.  But as long as you understand that it is a common and useful practice.

  I would not use a global variable for data that are constantly changing (use registers to offset or Action motor) and/or processes that have critical sections of code (use a motor of Action).

  NOTE: I use the definition of Mercer to FGV (a Get/Set only) and motor Action (many cases which specifically affect the data).

• Problem in creating a global var 'data' to a json file - need help

  I'm having a problem with a code and need help.
  I use the code below to load and parse a JSON file and store the result in a var 'data '. Everything works fine on the compositionReady page. The problem is that it would save a lot of extra time analysis of loading/if I could do this 'data' available worldwide. With the current

  var = eval (json) data

  the 'data' are only available locally. So, how do I or can I do a global var ABOARD cela?

  Here's what I have now and what I tried.

  $.getJSON ("images/profiles.json", function (json)

  {
  SYM. Data = eval (json); it does not work
  data var = eval (json);
  var temp = eval (json); , and is not this pair
  sym.setVariable (temporary data)
  for (i = 1; i 17 <; i ++) {}
  sym.getSymbol("thumb"+[i]).$("thumb1").css ("background-image", "url (".thumb + data.player [i] + ")" ");
  sym.getSymbol("thumb"+[i]).$("j_num").html (data.player [i] .j_num);
  sym.getSymbol("thumb"+[i]).$("p_name").html ((data.player[i].f_name) + "< br >" + (.l_name data.player [i]));
  } / / 3 above lines retrieves the thumbnail image of players, Jersey number and first - last name. it's all working well
  }
  );
  SYM.$("stage"). CSS({"margin-left":"auto","margin-right":"auto"});)
  
  There are 17 other 'profile' of sym.elements leaves, who will appear via ' by clicking on ' an animated image of an inch. Each sheet contains approximately 20 "fields" that get their data from the JSON file. If it is better to recharge/eval the json for each sheet I can do. It's just seems a better idea to be able to access the same 'data' and only load/parse it once?
  If any of you gurus of coding could help me I would appreciate it.
  
  Thank you
  
  Joel H

  Rough workaround is to use data = eval (json). This will create a global variable. Not a good solution though. Smarter way is to use the setVariable() method: sym.getComposition () .getStage () .setVariable ('data', eval (json)). After that, you can use data var = sym.getComposition () .getStage ().getVariable('data') to access.