understand the concept of global variables

Similar Questions

• 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.

  --
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• Understand the concept of sequences - CS4

  I'm one of you good people can explain to me how to put several plans on the same timeline and how to merge the sequences. I can't grasp the concept. I have no problem to import images.

  I was at half way through a project and presented in Digital Juice Ready2Go pre-made sequence and instead allow me to deposit in the current timeline, it opens as one new project in another window. I ended up having to recreate the images from this original project and place it behine the DJ footage.

  In addition, how would you put several projects together on the same timeline after them created? I'm really lost on this and could use some help.

  For the concept, I see "Sequences" as "Deadlines." I use to change the "scenes" or "chapters" separately and not have them on, or linked to, when I author of the project in again. I can keep everything in one project, but can have several sequences. I also think the sequences as "mini projects", in a project of "master".

  When a material of imports, such as a PSD file in layers, it strictly speaking as a separate sequence, in the project from the project Panel. We can't directly import a sequence into another, BUT we can easily give focus to a sequence, copy content, then bring the focus to another sequence, set the CTI (current time indicator/reading head) as you wish, to identify the necessary courses and then paste the content.

  If you import this DigitalJuice file into a project, it should appear as a sequence in your project Panel. If it is open a new project, then something's weird about this file. As you can have a project open at a time, we could choose the material of the open Digital Juice file original, copy, of the project, and then paste. Not as easy as just switching the focus of the sequence in the sequence.

  Good luck

  Hunt

• Understand the Concept of organization in OIM 11 g

  Hello

  Say that we "Org Org B, Global help Desk" as suborganization Xellerate users and users in the framework of assistance has been given roles admin Help Desk, user as part of technical support will be able to reset the password across A Org, Org B etc?

  And say a resource is assigned to the Org as accounts available, can we restrict that this account not to be shown to the Help Desk to perform any type of management accounts-if not how can achieve us?

  Looking forward to the clarification, thanks in advance.

  Yes, using the code you can assign any number of administrative roles to a single user. For example, you can assign Helpdesk Admin role of Org A and B Org Org Helpdesk user.

  But it is only support using the code and you can automate it.

  FYI: sample code at: Re: organization control Admin in 11 GR 2 IOM

  ~ J

• Lessons on the looping and global variables in functions

  I'm trying to gather a complete inventory of virtual machines and hosts in my environment.  For VMS, I am train to collect the information below but problem a loop in the case of hard drives and network cards.  For example, on hard drives, I get the following result:

  VMNIC1: Network card 1
  NICMAC1: 00:50:56:87:01:e6
  NICNetwork1: dvPortGroup6666

  NICState1: Logged, GuestControl, StartConnected
  HDName1: hard drive 2
  StorageFormat1: thin
  HDCapacityGB1: 100
  Datastore1: [RXCXN00020] host108a/host108a_1.vmdk

  As you can see, only the last instance of the disc is saved in my outings.  In other words, HDNamex is never incremented but the value (here "drive 2") always represents the last disk that is, this virtual machine has two disks.  I have a few virtual methods with five disks and, in this case, there HDName 1 to a value of hard drive 5.  How properly I loop through each instance of my hard drives?

  A key part of my information on Virtual Machines is the Cluster they are on.  This value, however, is only available by attribute parent of the host object.  Therefore, I created a hash table to try to do that research, but it seems that the hash table is lost outside the function Get-HostInfo.  Note the Get-VMInfo function tries to access the values in this Hashtable with the following result:

  Cannot perform indexing in a null table.
  D:\scripts\VMInventory.ps1:36 tank: 82
  + $VMStuff | Add-Member-type noteproperty-name HostCluster-value $HostHashTa
  wheat [< < < < $VMStuff.Host]
  + CategoryInfo: InvalidOperation: (host012.domain.com:VMHostIm
  [of] pl), RuntimeException
  + FullyQualifiedErrorId: NullArray

  Looks like I need to be "global" and not just its function, this hash table.  Any help of any of these two issues would be greatly appreciated.  Here is my code:

  Function Get-HostInfo {}
  Begin {}
  {In process
  $HostStuff = new-object psobject
  $HostHashTable = @ {}

  $HostStuff | Add-Member-type noteproperty-name HostName-value $_
  $HostStuff | Add-Member-type noteproperty - name PowerState-value of $_. PowerState
  $HostStuff | Add-Member-type noteproperty-name CPUQty-value of $_. NumCpu
  $HostStuff | Add-Member-type noteproperty-name of generation - value $_. Build
  $HostStuff | Version-value add-Member-type noteproperty-name $_. Version
  $HostStuff | Add-Member-type noteproperty-name manufacturer-value of $_. Manufacturer
  $HostStuff | Add-Member-type noteproperty-name MemoryTotalGB-value of $_. MemoryTotalGB
  $HostStuff | Add-Member-type noteproperty-model name - value of $_. Model
  $HostStuff | Add-Member-type noteproperty-name NetworkInfo-value of $_.NetworkInfo
  $HostStuff | Add-Member-type noteproperty-name of Cluster - value of $_. Parent
  $HostStuff | Add-Member-type noteproperty-storage of value-name $_. StorageInfo

  $HostHashTable [$HostStuff.HostName] = $HostStuff.Parent

  write-output $HostStuff
  }
  {End}
  }

  Function Get-VMInfo {}
  Begin {}
  {In process
  $VMStuff = new-object psobject
  $VMHashTable = @ {}

  $VMStuff | Add-Member-type noteproperty - name VMName-value $_
  $VMStuff | Add-Member-type noteproperty-name Mnmemonic-value of $_. Folder
  $VMStuff | Add-Member-type noteproperty-name of the host - value $_. Host
  #Link the virtual machine to its location of cluster
  $VMStuff | Add-Member-type noteproperty-name HostCluster-$HostHashTable [$VMStuff.Host value]
  $VMStuff | Add-Member-type noteproperty - name PowerState-value of $_. PowerState
  $VMStuff | Add-Member-type noteproperty-name ProvisionedSpaceGB-value of $_. ProvisionedSpaceGB
  $VMStuff | Add-Member-type noteproperty-name UsedSpace-value of $_. UsedSpaceGB
  $VMStuff | Version-value add-Member-type noteproperty-name $_. Version
  #Get information about the adapter on each instance
  $AdapterInfo = get-NetworkAdapter $_
  {foreach ($Adapter to $AdapterInfo)
  $j = 1
  $VMStuff | Add-Member-type noteproperty-name VMNIC$ j-$Adapter.Name value
  $VMStuff | Add-Member-type noteproperty-name NICMAC$ j-$Adapter.MACAddress value
  $VMStuff | Add-Member-type noteproperty-name NICNetwork$ j-$Adapter.NetworkName value
  $VMStuff | Add-Member-type noteproperty-name NICState$ j-$Adapter.ConnectionState value
  $j ++
  } adapter #end foreach loop
  Information disk hard #Get for each instance
  $HardDisks = hard disk get $_
  {foreach ($HD in $Harddisks)
  $i = 1
  $VMStuff | Add-Member-type noteproperty-name HDName$ I have $HD value. Name - force
  $VMStuff | Add-Member-type noteproperty-name StorageFormat$ I have $HD value. StorageFormat-force
  $VMStuff | Add-Member-type noteproperty-name HDCapacityGB$ I have $HD value. CapacityGB-force
  $VMStuff | Add-Member-type noteproperty-name data store $ I have $HD value. Filename-force
  $i ++
  } foreach #end HD loop
  #Select the windows machines for obtaining information from WMI
  If ($_ - like "w *") {}
  $OSinfo = get-WmiObject-class Win32_OperatingSystem - computer $_
  $VMStuff | Add-Member-type noteproperty-name OSSerialNumber-$OSinfo.SerialNumber value
  $VMStuff | Add-Member-type noteproperty - name OSVersion-value $OSinfo.Version
  $VMStuff | Add-Member-type noteproperty-name OSVServicePack-$OSinfo.ServicePackMajorVersion value
  $VMStuff | Add-Member-type noteproperty-name OSCaption-$OSinfo.Caption value
  $VMStuff | Add-Member-type noteproperty-name OSInstallDate-$OSinfo.InstallDate value
  $VMStuff.OSInstallDate = ([WMI] "). ConvertToDateTime (($OSInfo). InstallDate). ToString ("yyyy-MM-DD hh: mm :") ")
  $VMStuff | Add-Member-type noteproperty-name OSLastBoot-$OSinfo.LastBootupTime value
  $VMStuff.OSLastBoot = ([WMI] "). ConvertToDateTime (($OSInfo). LastBootUpTime). ToString ("yyyy-MM-DD hh: mm :") ")
  $ComputerInfo = get-WmiObject-class Win32_ComputerSystem - computer $_
  $VMStuff | Add-Member-type noteproperty-name OSSystemType-$ComputerInfo.SystemType value
  IP #Get each adapter information
  $OSNICArray = @)
  $OSNICrecord = get-wmiobject Win32_NetworkAdapterConfiguration - filter IPEnabled = TRUE - computer $_. Select legend, IPAddress,: IPSubnet, DefaultIPGateway, DNSDomainSUffixSearchOrder and DNSServerSearchOrder
  $OSNICArray += $OSNICrecord
  {foreach ($LAN to $OSNICArray)
  $VMStuff | Add-Member-type noteproperty-name OSAdapterName-value $LAN. Legend
  $VMStuff | Add-Member-type noteproperty-name OSIPAddress-value $LAN. IPAddress
  $VMStuff | Add-Member-type noteproperty-name OSIPSubnet-value $LAN. : IPSubnet
  $VMStuff | Add-Member-type noteproperty-name OSGateway-value $LAN. DefaultIPGateway
  $VMStuff | Add-Member-type noteproperty-name OSDNSSearchOrder-value $LAN. DNSServerSearchOrder
  $VMStuff | Add-Member-type noteproperty-name OSDNSSuffix-$LAN.dnsdomainsuffixsearchorder value
  } foreach LAN #end loop
  } #end if

  $VMHashTable [$VMStuff.VMName] = $VMStuff.Host

  write-output $VMStuff
  }
  {End}

  }
  #Specify location to search
  $Location = 'My Place'
  SE connect-VIServer 'VIServer1 '.

  #Gather the host information
  $HostatSite = get-vmhost-location $Location
  $HostatSite | Get-Hostinfo
  #$HostatSite | Get-Hostinfo | export-csv "d:\scripts\server-report\'$Location'-HostReport.csv".

  #Gather VM information
  $VMatSite = get-vm-location $Location
  #$VMatSite | Get-VMInfo | export csv d:\scripts\server-report\$Location-VMReport.csv - NoTypeInformation
  #$VMatSite | Get-VMInfo | ConvertTo-Html | Set-Content d:\scripts\server-report\$Location-VMReport.htm
  $VMatSite | Get-VMInfo

  The problem is that the Export-CSV cmdlet examines the properties of the first record it only reads and displays the properties for all the records. You can leave the script write a dummy record as the first album with all the columns that are possible. That will solve this problem.

• 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.

• To access the Global Variables in the functions/methods

  Which of the following statements is better in terms of performance and efficiency?

  public var a: int = 0;

  
  

  public void add (): void {}

  a += 5;
  

  }

  Addition();

  OR

  public var a: int = 0;

  public void Addition(b:int):int {}
  b += 5;
  Back to b;
  }

  a = (a) Addition;
  
  I saw a lot of guides discourages the use of global variables in the functions/methods, but I just don't understand why anyone would create a copy of the variable, modify this copy and to grant this value to another variable and throw.

  You must create an instance to pass to your function.  the parameter (for example, mov) does not create a separate instance and creates only a temporary pointer to the passed object.

  If an instance is prepared for gc, having spent this instance to any number of methods (as a parameter) delay / will not interfere with ca.

  and Yes.

  MOV ['x'] = mov.x,

  MOV ["rotation"] = MOV.rotation,

  MOV [anypropertystring] = MC.anyproperty

  Flash uses array notation to solve strings into objects:

  var var1:ClassType = new ClassType();

  This ['var1'] = this.var1

• 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.

• I don't get to use the global variable. Take a look in my form, please.

  Hello.

  I'm ashamed. I'm not able to use a base on the LiveCyle feature: Global Variable / object.

  I have a textfield for the user to put your name. Then, the user must click at the base. His name and value must be of value to a global variable, then I would use this value in any form.

  This look at my example I would use this value.

  https://Acrobat.com/#d=k0YlC1MXEdVTh1g2TXAJxw

  What is the error? I tried to put as a global variable, but it does not work.

  PS: Call of the value using textfield (TextField.rawValue = TextField2.rawValue), it works fine, but I prefer to use the variable

  Thank you very much.

  Hi Rafael,.

  I'm good thanks

  I do not know if I understood the question, but I think you're asking if it is possible to have a field that displays the value of a global variable (i.e. the 'view' you refer to), which is updated automatically via scripts of calculation or similar to but not dependent on another event, such as 'click '.

  In my view, using a linked across the object world is the only way, and you are right - it is certainly easier.

  Please let me know if I've not understood the question

  Thank you

  Tim

• 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

• 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).

• Question about the use of constant variables in forms

  As I am still very new to forms, please forgive my ignorance, if the answer to my question is very simple. I'm trying to understand how to use constant variables in my application Forms. For example, if I want the return code of constants for the configuration application (not, mind these are examples):
  
  RC_SUCCESS CONSTANT PLS_INTEGER: = 1;
  RC_FAILURE CONSTANT PLS_INTEGER: = 0;
  RC_YEAR_DATA_NOT_FOUND: = 50;
  
  Then in a module I created, if I wanted to check the return code against one of the constants I would do:
  
  DECLARE
  RC PLS_INTEGER;
  BEGIN
  GET_YEAR_DATA ('2000 ', rc);
  IF rc = RC_YEAR_DATA_NOT_FOUND THEN
  -Make an error handling
  END IF;
  END;
  
  I know that you can declare constants within the individual procedures or packages, but I can't find information on how to do it in the world for the application. I read on the use of global variables in forms, but only the CHAR data type and the fact that the value can be modified doesn't really fit for this purpose have I missed something? Is there a config file or something for the Web server that can be used to configure these?
  
  Any help would be appreciated.
  
  Thank you

  To declare constants create a Package specification in a pll and deifne all your vitals, something like:

  PACKAGE PK_CONSTANTS IS
    RC_SUCCESS CONSTANT PLS_INTEGER := 1;
    RC_FAILURE CONSTANT PLS_INTEGER := 0;
    RC_YEAR_DATA_NOT_FOUND := 50;
  END;
  

  Then attach this pll for all your forms-modules and use it as

  IF rc = PK_CONSTANTS.RC_YEAR_DATA_NOT_FOUND THEN
    ..
  END IF;
  

  A word on exceptions or errors: to me more clear (and in the case of exceptions even better) to throw an exception only to hide behind return-codes.

• 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

• Global variables for alerts

  Is this possible, or currently a function, to use the system or global variables in alerts?

  We are transmitting these alerts in a ticketing system, and they keep opening the same ticket, because there is no difference in the subject line.

  Would it be possible to have a feature, a box to check, or variable that can be added to the subject line of the alert or alerts name field?

  Example:

  

  Name: % DATE logged courante% TIMES

  Or maybe a checkbox that adds the date and time to the subject line of the e-mail?

  I love! You can open a query on loginsight.vmware.com?

• Need help to understand the collection

  Hi all

  I'm trying to understand the concept of collection, but when I look in the documentation that exists in google.ca, then, it seems very confusing. If someone suggest me or send me some simple examples and good collection and I really appreciate it. Thanks in advance.

  Concerning

  Line

  Thanks for the explanation, could you please explain what does really to take care of the index as a whole and clause varchar2 and if yes then what condition we use varchar2 index and in which condition we use index as a whole, be we just use index by integer in our daily practice. Really appreciate your response. Thank you

  Generally if you use collections, especially PL/SQL-only collections, your architecture is probably wrong. Collections are rarely necessary, but are often USED in the mistaken belief that they will help performance.

  The use of the collections usually DEGRADES performance, sometimes severely, and they are often used in a way that is not scalable. You should avoid using collections if possible.

  So don't use the collections AT ALL in your 'common practice '.

  For the rare cases where there is to use an array associative index type to use depends on the data type of the element that you will use for the index. If you plan to use a string, then you use INDEX OF VARCHAR2. If you plan to use an integer, then you use INDEX BY PLS_INTEGER.

  What type of index to use has NOTHING to do with performance.

  One of the WORST mistakes developers make is to use an associative array as target of a BULK COLLECT INTO instead of using a TABLE IMBRIQUEE. Collection in bulk is more often used in a FORALL statement so that the elements are accessible only in the order. Useds "indexed" access with associative arrays isn't even necessary or used.