Singleton vs normal/global variable

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• Global variables or shared unique process variables?

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  Given that the
  introduction of shared variables, whenever I needed a global variable, I have
  use shared unique process variables. But I started now return to
  using the old global variable because I think that there are some significant drawbacks
  to the single shared variable. Here is the ability to search for
  case of variables and also the ability to view or change the value of
  the variable (OK, we have the variable Manager, but I found slow and)
  unstable). My question is, are there reasons to use the new single
  process variable actions on old global variables?

  Dear Terje,

  As you use only the variables on a single system. There is no advantage to the use of unique process shared on Globals variables.

  Infact a global variable uses a little less processing power that a global variable as the implementation of a shared variable single-pocess effect is a global variable with the timestamp feature.
  If you use a shared variable single process, if you don't need the timestamp feature, then disable it to use less processing power.

• 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

• Global variables are accessible from the local computer

  While he was trying to use RT project, I can deploy the file to the RT target and communicate with the host using a shared variable.

  But the host VI file returns an error stating that the shared in the pattern-block VI host variable is illegal.

  (RT.lvib\Link reqd\ 'shared variable' node is illegal)

  It also gives a description mentioning that global variables are accessible only to local machines.

  What is the cure?

  Hi Shan21,

  I think your problem with communication between the aim of RT and the host PC might be caused by how your deployment of your variables. Please take a look at the following and let me know what you think,

  Kind regards

  ******************************************************************************************************************************************

  When you make the executable of a project using shared variables, you must have a local copy of the variables on the deployment computer that are then linked to the 'real' shared variables stored on the target - cRIO, in this case.

  This means that the display of your project should look like this:

  

  Note: Two libraries, which can have variables with the same name because they aren't both on the local computer.

  The steps required are:

  1. create variables shared in the normal Manor on the cRIO:

  

  a. right click on the target
  b. new > Variable
  c. properties of the variables enter the name (stop); Data type (Boolean) and the Variable type (always in network-published).

  2. create variables shared on the host PC:
  a. follow the steps 1 a - c
  b. right click on the box to enable anti-aliasing

  

  c. linking to the URL of the PSP, click on Browse - and select variable on the target:

  

  d. click Ok.

  Note: Remember also to deploy the shared manually variable llb. See the related links for more information.

  It's from a base of knowledge to write soon.

  Note:3UCBHM8T knowledge base: how to deploy network Variables shared a compiled executable

• Global variables and the applications

  Version of the APEX = 4
  -DB version and edition = 10g
  -Web server architecture = SST
  -Browsers = IE 8
  -Theme = 5 # Opal
  -Models
  -Region/process type
  
  I need to run a report (not a report of the apex, but a report produced in annother (reporting services) technology) that can be executed by calling a url. I'll have different environments (dev, ft, ut, prod) so I feel the application needs to know what environment is running. The only way I can think to do this is to know what workspace I'm running in. I how I determine this code, is there I can refer to a variable of apex.
  
  Also a global variable is adjustable in the apex? If so it is defined on the homepage?
  
  Any help would be appreciated.
  
  Thank you

  The only way I can think to do this is to know what workspace I'm running in. I how I determine this code, is there I can refer to a variable of apex.

  This can be done by using the views of APEX:

  select workspace_id, workspace
  from apex_workspaces
  where workspace_id = v('WORKSPACE_ID')
  

  Also a global variable is adjustable in the apex? If so it is defined on the homepage?

  Normally it would be a part of the application, defined using a calculation of the Application.

• CFC's global variables

  I'm looking for that certain variables in a cfc available in all the functions of this cfc. I used to do that with properties, but just discovered a problem with this approach. Now I'm trying to normal variables, but I find that not all keep them their value. The model seems to be, if the variable has been set to a point it loses its value, otherwise it keeps things.
  
  For example
  Model call:
  args = structNew();
  args. StartDate = "2006-09-01;
  args. EndDate = "2006-09-01;
  
  ABC = CreateObject ("component", "BlocksAndClosures");
  x = abc.init (argumentcollection = args);
  z = abc.blocks ();
  
  -------------------------------
  Beginning of cfc
  < cfscript >
  WhatToUse = "undefined";
  StartDate = '1990-01-01 ";
  EndDate = "1993-01-01";
  x = true;
  < / cfscript >
  
  ----------------
  the init function code
  StartDate = CreateOdbcDate (argument. StartDate);
  EndDate = CreateOdbcDate (argument. EndDate);
  WhatToUse = "something";
  
  < cfdump var = "#variables #" >
  -----------------------
  blocks function code
  < cfdump var = "#variables #" >
  
  ------------------------------------
  When I emptied the variables at the end of the init function, all variables have the new values. It is to be expected. When I dump them in function blocks, WhatToUse is now equal to "something else" which comes from the init function. However, the date two variables have values of 1900 and 1993 which seem to mean they have been reset.
  
  I can work around this problem, but no one knows why not all variables of EFA behaved the same when the block function was called?

  Could get you a collision of scope with the variables of your global variables and arguments? What happens if you rename the arguments or the global vars? I got the thing in global variables in CFCS to work before, but I usually make sure that the name of global variables is different from my local variables or entry.

• where and how to declare global variables

  I am creating a Flash multiple-choice quiz. I created a clip named mc_Quiz. This clip contains a layer of action and an object layer. THW action layer contains 1 keyframe with code (code of a button that moves to the next section).
  
  The object layer contains 11 contains keyframes 10 the KeyFrames
  a single movie clip question, (mc_Q1 through mc_Q10) and a btnNext to move to the next section. The video clips in question (e.g., mc_Q1) contains a "btnCheck" button and the code to check the answer.
  
  The 11th framework contains a film click that contains an input text box 'userName', a 'score' of the user's dynamic text box and a submit"" button. Not yet submit the information anywhere, I do it so that when I click on the "present" enter key 'Please enter your name' if it is empty. " And if it is not empty, it will be 'Thank you.'
  
  What I have to do is to have the 'btnCheck' to add 10 points for each correct answer to a variable. Then place this total in the 'rating' dynamictext box when the user moves the frame 10 to 11. I don't know where declaring the variable and how to add the variable every time the correct answer is given.
  
  How this is done?
  
  Here's something that does not work.
  
  First image of "mc_Quiz":
  
  Stop()
  var advanceNext:Number = currentFrame;
  static var; userScore:Number;
  btnNext.addEventListener (MouseEvent.CLICK, nextQuestion);
  
  function nextQuestion(evt:MouseEvent):void {}
  gotoAndStop(advanceNext ++);
  }
  
  
  
  As part of "mc_Q1".
  
  Stop()
  messageBox.text = ""; Clears the response area
  var correctAnswer:String = "Holy"; Good response for comparison games
  var userAnswer:String; with the value of the radio button group.
  var rbg:Object = rbA.group; Get the name of a group from the first button ragio.
  
  
  btnCheck1.addEventListener (MouseEvent.CLICK, checkAnswer1);
  
  function checkAnswer1(evt:MouseEvent):void {}
  userAnswer = String (rbg.selectedData);
  If (userAnswer == correctAnswer) {}
  messageBox.text = "Yes", + userAnswer + ' is CORRECT! ";
  userScore = score.value + 10;
  rbA.enabled = false;
  rbB.enabled = false;
  rbC.enabled = false;
  rbD.enabled = false;
  }
  else {}
  messageBox.text = "your answer is INCORRECT.";
  rbA.enabled = false;
  rbB.enabled = false;
  rbC.enabled = false;
  rbD.enabled = false;
  }
  }
  
  In fact, I have no idea where to declare the variable or how to add 10 points when I select the right answer. It seems to me that I have to some how change this variable within the function of the button.
  

  AS3 does not directly support global variables, like its predecessors, but there are ways around it. Without going through the overall road, to communicate from a child object to a parent the normal approach in AS3 object would (literally)...

  MovieClip (this.parent) .totalScore += 10;

  Alternatively, you can create a world class and use that. If you save the following in a file named "global.as" in your class path (or file that your project is the folder), you can use the variable in a global sense, while importing the class where it is needed:

  package
  {
  public const global: Object = new Object();
  }

  Use it in the Flash file...

  global import;

  global.totalScore = 0;

• The values of global variables change spontaneously

  I am currently doing a quiz/board game. There is a 'Question to card' button that goes to a random image in a specified movie. All images in this film has a question with answers that make players advence on the Board of Directors. The problem is, I have to make sure that once a question appeared and has received a reply, it cannot pop up again. I thought to declare a global variable for each question ("_global.q1" in question 1 and so on) in the framework one of the movie root with a value of '0 '. The answers to each question, to move the pieces on the Board, becomes the '1' variable value (on (release) {_global.q1 = "1"}). And directly under each question of the film container question, I made an invisible film with the script below, thinking the first time governing load the variable must be set to 0, then the question will load normally. and later, since the answer is set to 1, the script below in the next section. Thus, no question is repeated.
  
  onClipEvent (enterFrame) {}
  If (_global.q1 = '1') {this._parent.nextFrame ()};
  }
  
  However, on the film tests, I push the button with the gotoAndPlay (random ()) and all my values of variables defined by one, taking me all the way to the last image in the question that contains the movie.

  > If (_global.q1 = "1")

  Must be:

  If (_global.q1 is "1")

  A = single assignment, a double == is a test for equality.

  --
  Dave-
  www.offroadfire.com
  Developer leader
  http://www.blurredistinction.com
  Adobe Community Expert
  http://www.Adobe.com/communities/experts/

• 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.

• DLL and global variables

  OK, here's a strange problem.  I am very new to create the dll, so I don't know that I have just an installation problem.

  But I'm trying to pass a global variable of a host program to its attached DLL.  I got this job when I was the CVI 2014. I recently upgraded to 2015 and then started getting "undefined symbols" errors.  With some struggle I managed to compile again, but broke the variable connection in the process.

  I have compiled my DLL in debug mode so that I walk in from the test project.  Right now, my global variable exists in the test project, as well as in the DLL.

  Can I export the variable and the use of DLLIMPORT/DLLEXPORT?  Confused and curiously not to find anyone quite like this on the forums.

  EDIT: this post stack overflow described pretty well from my experience.  I am linking statically.

  Well, what do you know?  I found my problem.  This draft article and example WERE vital to the solution.  This article called, "using the Export method qualifier"was also useful.  I'll cut to the Chase...

  If you use a qualifier of export on the definition and the import on the declaration, LabWindows/CVI identifier export symbol.

  This is the right key.

  So in my example, it should look like this:

  DLL fichier.c

  int DLLEXPORT varName = 0;

  Header.h DLL

  int DLLIMPORT varName;

  Project that uses DLL.c

  #include "header.h DLL.
  
  varName! = 1 ;  a method to change this variable for local use

  Pretty easy, huh?  But wow, it took some time to find.

• How to extract file with LabVIEW Teststand global variables

  Hello

  My goal here is to extract all the contents of the global variables for file (names and the value of any types) in a sequence of my LabVIEW UI file.

  For now, I can only open a file of sequence of LabVIEW and get the number and the names of the variables (cf. vi) attached.

  But if my variable is a container, I would like to know all the contents of this container (and so on) and I don't know how to do it.

  In addition, I have to extract the value of variables that I don't know the type in advance...

  Can you help me?

  Thank you.

  Well I finally used the method "GetNthSubProperty" to work on each variable and I use the property 'Type' to know if it's a number, string, boolean, or a container. If it is a container, I repeat the process at a lower level... (see attached vi)

• Global variables for circular buffer

  Hallo!

  I have another question:

  I need to have a variable circular buffer size. So I want set size circular buffer by a global varable.

  Is this possible? I tried to use the global variable like {VAR_01} to insert in the field that you want to the memory size circular buffer, but dasylab puts only a zero in the field.

  Thank you and have a nice day.

  Hilby

  Unfortunately, it is not possible to have a variable size buffer. Right-click in the textfield corresponding: the shortcut menu does not show an entry to select the global variable from a list.

• 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

• Functional Global Variables: an indicator can be used instead of a shift register?

  It is a simple question, but I can't find an answer to it. The model agreed to a functional Global Variable is to use an uninitialized as in this example shift register:

  

  ('Référence IN' and ' Reference to "is actually a pile of references.) There is also a "Se Refnum" case, which comes the straight through the tunnels shift register.

  My question is, why can't we do store the indicator data? It is much simpler to use a shift register (IMHO a non obvious way to store global data!):

  

  The case "Se Refnum" does absolutely nothing. Other functions such as erasure of data can be implemented just as easily. The advantage of the FGV to help avoid race conditions is maintained because you always use the VI to access the data.

  JonP says:

  
  

  Not so much, the Inidicator can happily live outside the case structure, together and Clear would be just assign different values.

  If you have only a case structure, the indicator could not live outside of it.  In order to maintain the indicator data, your design requires that it is not written in for a case of Get.  If you have an exterior structure deal that decides on 'Get' or 'set or clear' and (in the case of "Set or clear") contains the terminal of the indicator and a classiquee case that decides on 'Set' or 'clear '.  However, I would consider this a design below using the standard template of the FGV.

  The difficulty with retrieving the value if you want to do a read operation / writing change. But LV provides many ways to retrieve data from an indicator (one you don't mention is the 'Value' property), do you mean that's all "incorrect"?

  Yes (I mean that they are all incorrect).

  You could hack your way around the design to work with a single structure of matter and the terminal of the indicator being outside using a method to read the value of the indicator and through a tunnel to the structure of the case through wiring for the tunnel of writing indicator in the case of 'Get '.  However, who will require a local Variable or value of property node.  As I said, these (I only mentioned the local Variable originally) are not good choices for performance and scalability.  If you are not aware of the functional differences between the terminals, local Variables and nodes of property value, refer to this article (obviously advantages/disadvantages such as redraw objects on the front panel are not relevant here).

  I guess you could say that indicators should only be written, but it is difficult to be pure!

  No, it's not, just use the classic design of the FGV!

• Functional global variables with polymorphic VI

  Hello

  I am keen to build a functional global variable in a polymorphic VI. So, for example in a functional global variable, we have case structure. I want to build separate VI for the structure of the case and make a polymorphic VI.

  Is it possible that I could use a polymorphic VI rather than business structures?

  Thank you!

  You could create a polymorphic VI that serves as a wrapper for the FGV.  The idea is that each instance of the polymorphic VI called FGV with selected appropriate case-sensitive.  Then your API is the polymorphic VI instead of FGV.