Legacy of grandchild parent - OOP

Similar Questions

• Why the parent class does not report data for child in LVOOP class?

  Attached is a practical program that I wrote to learn about the legacy with LVOOP.

  I have the impression of OOP is a Parent class describes the type of object.  Then the children inherent description of the parent.  The child may also have additional qualities, but it still contains the description of the parent.  If a child does not have a VI bearing the same name as the parent and the parent VI will be loaded and executed.

  My questions:

  (1) why does the Parent.lvclass:Read.vi not report 'Child' in the channel indicator when the child write VI has been sent?

  2) matches the data of the child, do not at all seen by the parent company even when it has the same definition (that's the String)?  I understand that the Parent do not know anything about the unique child elements, but I think we should know about the common themes which inherited the child.

  Here is my sample code:

  

  These are two different sets of data. The parent class has a data set containing the string, the class of the child also has a data set containing the string, but both of these channels are separated.

  This can be made apparent, by changing the names of the channels based on their respective categories:

  

  What you want is for your children, class VI write to access the data of the parent class. You can do this with a simple data VI member access in VI of the child:

  

• A Question of legacy LVOOP

  Hello to all you LVOOP guys and girls,

  I have a question that seems like it should be relatively simple, but it is obvious that I don't understand what is actually happening behind the scenes of LVOOP.  What I have is two classes that inherit from the same superclass.  The super class provides basic functionality I want to maintain between the various bodies and functions cannot be overridden by children.  Now, the problem in my application where I want two classes operate in parallel - at the same time, these classes appear to be contaminating each other and producing odd results that are not ideal.  For example, I have a function that inserts an error generated by the child in an error queue (the reference to which is held by the parent company) which is then sent to an error handler, owned by the parent company.  What I find is that the error is then handled by the instance of the parent class of evil!

  This behavior is normal?  Do not forget that I am using data flow programming, and all access to the two classes are on the same thread where the class is first instantiated.  If the behavior is expected, is anyway I can get around this?

  Since this could be a little incomprehensible, here are some shots of what I'm talking about:

  

  The image above is a snapshot of the two different classes child running in parallel using the same class of parent.

  And here's the example I gave - a VI simple to put errors in a queue for access and manipulation by the child class:

  

  Any thoughts would be appreciated.

  Peace, Matt

  Your description and images are not enough, then it will be only general, but here are a few relevant points:

  1. How do you get the Ref of the queue? If get you it by name, then both references point to the same queue, then this would be my first guess for what is your problem.
  
  
  2. You seem not understand the terminology of OBJECT-oriented programming. There is 'no instance of the parent class' - in your case you have probably two instances on your diagram, which each also inherits its behavior of the parent class (I say probably because there are any number of operations that can create instances, like a wire connection). To simplify terminology, I'd use 'object' instead of 'instance', so you have two objects.
  
  
  3. In order to better clarify this point - in this case you seem to use "instance" to refer to an object that has a specific reference to the queue (for example you want basically a behavior by reference), while LVOOP is inherently by val and it means that the memory has been allocated to an object, but that object can be quite identical to another object instance.
  
  
  4. I don't know how LVOOP you studied, but there should be some info autour (which many in the forum of LAVA OOP), as well as some courses of OR that might help (not taking them, I don't know what their level).

  If this does not help, need more details, the real code preferably.

• Simple example of child to access the Parent data

  Hi all

  Im trying to explore and make sense of OOP.  Ive been learning as much as I can, but why cant seemt to extract data from a class parent child.  Ive put the child to inherit from the parent and creates an accessor parent to read and write.  I write the data in the parent class and then try to read data from the child's class. Is there something im missing? Anyone have or know a link to a simple example of this?

  Thank you

  Matt

  Ok.  I think you have a misunderstanding of the works the POO here.  The idea with OOP is that you can pass the child object in the parent methods and is in any case on this object.  Your drawing should look like this:

  

• LVOOP - 1 table of Parents in several bays of the child?

  I have 3 types of channels in my system. DI, I and AO.

  I want to create a Parent class that has 3 children for each of my types of channels.  It's because I want to store (on disk using flatten chain) all my channels together as an array of strings.  It's ok because I can use the 'to the more generic class"and a record in a table of my parents (CHANNEL class).

  The problem is when I read this array of objects.  I can read my array of objects parent but then I want to transform my array of objects of string into an array of objects, an array of objects HAVE and an array of objects of the DI AO.

  Any ideas?  Thank you.

  Lewis_G wrote:

  Hi nathand thanks for the ideas.  I've implemented it as you sugested.  Is there a way to make it more scalable?

  You might abuse the primitive preserve Run-Time class, as shown below. This divided the table parent tables separated for each class of the child, but the type of each element of these tables is always the parent type, even if they are transporting children. Not sure if that's what you want, or not.

  

  Lewis_G wrote:

  The child the more classes i, messier, fine.  Even if the code is the same for both, I can't have a Subvi generic because the child class is different for the two.  Don't you think it's a good idea to have a new class of table for each child.  For example, I could make a class with a method that has a channel enter parent and trys to add it to the guard?

  This could be very good, if it meets your needs.

  Intaris wrote:

  nathand wrote:

  Otherwise, add a method to the class called parent Type Get and override it in each class of the child, and then call on each element of the array to determine its type.

  And make sure that the type is a string, otherwise problems ensure later in life...

  I thought to mention that when I offered everything first, but then I thought that there could be situations in which an enum would work very well if you don't mind violating good OOP practices. Yes, the parent should know his children and you need to know about all children at design time, but if you can accept these terms then an enum is simple. I'm undecided about whether I would never apply this solution if I were to try to solve this problem in my own code.

• Summary of functions (two entries) for classes of brother with a dynamic distribution of entry: the static entry retains the type of the parent class.

  Suppose that in a hypothetical example, I have a superclass (number) with two children (real and complex) classes.

  I would define a function of sum for these classes, using dynamic distribution.

  Real or complex would have its own method of the sum (VI) which would be subject to various operations, such as the real and complex numbers are different.

  As I understand it, the normal way to proceed in OOP is for each of these methods to have an entry of dynamic distribution and a static entry of its own type.

  Problem: Labview doesn't let me do this!

  I first define an input method dynamic-shipping dummy for the numberof the parent class, but only the first entry can be dynamic-Envoy while the other is statically typed as number.

  Then, when I create override methods in my two children classes real and complex, the second entry (static) remains under the number (the type of the parent class). This is not fair, because then I can't access the private data of the child class of type real or complex that will be connected to the second input (static).

  What is the solution to this problem (usually)?

  I think that, in LVOOP, you use only a dynamic terminal or a static terminal to the terminal object.

  You can have several other terminals, but all the dynamics VI (methods with the same name) must have the same API (terminals).

  If you have to understand your preferred mode to pass, use multiple terminals, not used by each method, or use a cluster that contains all the numbers to pass (real or complex, both of which are not used in each method) or you can try a Variant, as shown.

• Cannot use casting "to more specific class ' function to the parent class of child class

  Hello

  I am using OOP for my request for data acquisition. I have different e/s analog and digital materials. I create a superclass named DAQ.lvclass. This class has four childs: analog in out analog, digital, and Digital Out. I am trying to invoke screws of the child of the parent class's class. For that I am throwing the class parent her child to aid "to a more specific class' function. But I get the below error.

  Error 1448 occurred at the more class specific in DAQ.lvclassMain.vi AQ

  Possible reasons:

  LabVIEW: Bad type cast. LabVIEW does not deal with the run-time value of this class of LabVIEW as an instance of the given class of LabVIEW.

  How can I handle these cases where I have to call child VI of the parent member?

  I have attached two screws 1 snapshot. Main DAQ: it's the class main VI parent who manages all functions. 2. read the analog inputs: this VI trying to set the parent class for its class of the child and child vi reads value of data acquisition task. I get the second error off VI.

  Kindly help.

  Honestly, I have NO idea on what you want to do.

  Inheritance of classes in EACH OOD (object-oriented design) requires to define common ground as the parent class. Children can add things like properties and methods.

  If you set children who have no points in common, you have made a mistake.

  If all children have too many different specific methods, your OOD is absent.

  Example:

  Parent defines the method A.

  1 child adds the B method.

  Child 2 adds method C.

  But method B will not be usable on 2 children while method C will not work with 1 child.

  It is an approach that you want to prevent. In any programming language oriented OBJECT. This adds unnecessary complexity leading to difficult to maintain the code, and it is prone to errors.

  However, if you're going to do, "to more specific class ' is the correct type cast. But your screenshots and error messages, it is obvious that refine you a particular child's casting only. You must extend the code to check the real child, specifically expressed and call the method. That being said, your code increases the complexity you want to add a bunch of case of structures which essentially nihilates all THE BENEFITS of the use of OOP.

  I'm sorry to say that.

  Norbert

• Private class data accessible parent in the child's class?

  Hello!

  I thought this would be obvious, but my search thing fails to me.  I hope that someone would be kind enough to answer my question LVOOP of beginner.

  I have a a parent class.  This parent class contains a set of private class data.  I have Setup all the data accessor methods.  I create a child class that has functions that need to access the data stored in its parent category.  His legacy is defined, but when I try to separate data from class all that I can't do are what is configured in the cluster of data of the child class.

  I watched a video and it seemed that the DataSet magically appeared and is accessible via the methods of children.  What Miss me?

  Thanks for the input!

  -nic

  To access the data of the parent in the child's class class, you must use the accessor of reading methods you created for the parent class get the parent class data (you must use the same accessor methods in the methods of the child because all the data of the class is private in LabVIEW). I hope this helps.

  -RW

• use of OOP and not

  Hello, I use LabVIEW for a couple of years now and have met a few references to the OBJECT-oriented programming. I read a little of the help file to this topic and some stuff on the forum. I have a basic question that I would like to get an answer before we get too far into it. Basically, why? What gives OOP programmer that he can not do (or is really hard to do) in ordinary LabVIEW? It seems to me that this is another type of cluster. So I must be missing something.

  You are right - in BT, an object is really a cluster.  But there is more to this...

  In the interest of full disclosure - I exactly wrote an app using the OBJECT-oriented programming.  It is an application that uses a set of drivers VISA that I wrote for a USB line spectrometers.  Each type of spectrometer was similar, but necessary functions different hex codes to perform the same functions.  In addition, the format of the data returned by each spectrometer differs.

  I had exactly the same concern that you do before you start.  I decided to use LVOOP for a reason:

  I knew that I would have to expand the drivers in the future.

  I created a parent called spectrometer USB class which had subVIs for all common functions.  I created a child class for each of the types of spectrometers.  In children's classes, no matter where the orders differ between spectrometers, I overroad the Subvi parent class.  In the future when I need to add another type of spectrometer, all I have to do is create another class child and substitute the same subVIs.  99% of my code will not need to change at all...

  In short - OOP offers capabilities, that you have not already.  In my opinion, it's more like a technique of organization that can be used to help manage the code if you have one day to extend.  In my personal experience, it really made me think about the structure of the app and forced me to write highly modular, tight code.

  LVOOP was a bit of a pain to learn (I had to work a bit to understand how to use the dynamic allocation).  But after using once, I expect to use it - I even look forward to it.  However, it is not a cure all... efforts are necessary to implement, so I tend to avoid it for small (and even some middle) scale applications.

  Jason

• Question of OOP involving inheritance

  Hello

  I am trying to build an application using OOP, which I am new, and have a problem. The attached zip file has some model who once the code run will show the problem, in the case of the stop. I seem to be able to add classes to a parent, but the parent data are apparently crash.

  Tay

  There is a problem in your code.

  Whenever you change a State, you take a NEW object. The new object don't know anything about what you did in a State before.

  To this end, it seems that the data are overwritten, but this isn't the case. You replace the objact of hole with a new fresh object, how parent have any data.

  It is each object that remembers its own data, also what can have its parent, any if different classes have the same parent.

  The parent - child relationship is not a way to share data between objects. It is a way of defining a class with methods comments for different classes.

• Hyper-V NIC legacy

  I have WIN2K8R2 + Hyper-V role in Cisco UCS B200M2 with the card NETWORK M81KR model

  This NIC is 10 GB, but when I create Legacy NIC pxe in child vm, I get only 100 MB.

  The parent NIC is Cisco M81KR but why, once I created Legacy nic, it shows like Intel 21140 child vm

  How do I fix this

  Thank you

  It is a normal behaviour when you choose legacy for VM adapter.

  Here is information from Microsoft:

   A legacy network adapter works without installing a virtual  machine driver because the driver is already available on most operating  systems. The legacy network adapter emulates a physical network  adapter, multiport DEC 21140 10/100TX 100 MB. A legacy network adapter  also supports network-based installations because it includes the  ability to boot to the Pre-Boot Execution Environment (PXE). The legacy  network adapter is not supported in the 64-bit edition of Windows  Server 2003 or the Windows XP Professional x64 Edition.

  http://TechNet.Microsoft.com/en-us/library/cc732470%28V=WS.10%29.aspx

• Zipped folders are created without legacy permissions

  A minor but repetitive disadvantages:
  When I create a zip file, it does not inherit the permissions are of its parent folder, or in the files to be archived.

  Concrete example:
  in a folder with full control for everyone, check in text files.
  I confirmed that files legacy text full control for all the world.
  I archive the files by right-clicking on a group of them hovering on ' send to ' and selecting 'compressed (zipped) folder '.
  The zip file is created in the same folder...
  but the zip file does not allow full control for everyone.

  Why I love it:
  The parent folder is to be backed up using a bat file that runs ROBOCOPY.
  It cannot save the sub files zip.
  I have change permissions on each zip subfolder after have created you, or the ROBOCOPY settings to limit the attempts (in which case the zip files are not saved).

  Is there a simple solution, cunning, or setting to "send to" / "Compressed (zipped) folder" automatically creates the file zip with inherited permissions?

  (Note: I've seen what is happening on the Server 2008 R2 and Windows 7)

  Hello

  The question you posted would be better supported in the TechNet Forums. I suggest you to ask your question in the TechNet Forums.

  http://social.technet.Microsoft.com/forums/en-us/w7itprogeneral/threads

  I hope that helps!

• How can we stop Member of "attribute" inheritance from parents to children?

  Dear all,

  Do you know how I can stop sharing the attribute member between parents and children?

  In the case, I need to change the currency of the parent (CAD $) entity, but I want children to keep the currency CAD.

  In my case, when I change the attribute of the entity, the children inherit the mother.

  For me, the legacy is applied automatically to all members of the sub of the parent.

  Thanks in advance for your support.

  Jean Daniel

  Hyperion Planning 11.1.2.3

  As described in the Administrator's Guide

  If a parent has several children, of whom only one child has a currency that is overridden, the mother inherits code currency overridden in Essbase (which is not displayed on the forms of data).

  I think that is what is happening with you... I guess nothing can be done to avoid this, as it is written in the bible of the oracle!

• [noob] Removing parent if currentFrame child specific number?

  Hey all,.

  I practice with a code, create a small adventure game.

  I have a section of code in place to eliminate a parent (or child, depending on which is the correct term) of the scene once the chronology of the child reached a currentFrame, but it does not work.

  Naturally help would be appreciated. Let me know if you need more information. (Also, please let me know if there is anything I can do to improve the rest of my code.)

  The FLA files and GOT: https://www.mediafire.com/folder/g8ik8oe6sm14a/

  Code:

  public void goToAxScene(event:MouseEvent) {}

  campScene_mc.guyAtCampScene_mc.gotoAndPlay ("guyGoingToAx");

  If he is ready to move

  If (campScene_mc.guyAtCampScene_mc.currentFrame == 20) {}

  remove the old scene

  removeChild (campScene_mc);

  }

  }

  The code as it is must manage campScene_mc deletion when guyAtCampScene_mc reached chassis #20. Nothing is Pseudo-peripherique response #4. Although you'd have to add in addition to your own code, after the clip is removed in order to start a new scene.

  #1) 'e' is the name of the variable that accepts the forwarded event to the function (e: Event). I just use variable names short for ease in simple functions. An event will be sent to this function because I added an event listener to the campScene_mc of the clip when I wrote: MovieClip (campScene_mc). addEventListener(Event.ENTER_FRAME, handleCheckingClip);

  Because I added the event listener that it will trigger the event, I chose, Event.ENTER_FRAME, which is basically once every time a frame is rendered. In this way he won't miss chassis #20 when it hits. The function checks the image whenever the event is emitted.

  #2) It is somewhat a matter of low level, but I'll try to make it simple. ActionScript supports dynamic typed objects. This means you can declare a variable as 'var a: *;"or simply" "var a;". " with no type and it will be treated as an object that can be assigned to any type of object. This kind of thing happens with new coders when they forget to set the "type" of a variable. An object that is declared as this is the only type that can actually be assigned "undefined" as a value.

  Long story short, I could have used null, because if you check, null == undefined. They are cross-converted when checked to be equal. However, if you type really check them, they are not null = undefined.

  A simple example, a new coder forgets to declare a type or assign a value. Note in trace, it always tells you the type of the variable is an object, and you can use so he thinks it's ready:

  var a;

  trace(typeof a); object

  If (an 'object' of == typeof) / / true!

  {

  declared and ready to use! Or is it?

  a.someFunction (); Oops, error

  }

  That try again with undefined:

  var a;

  trace(a === undefined); real! This object is not usable

  If (a! == undefined) / / false, it is undefined, so do not run the code inside

  {

  Will never happen, one is not defined

  a.someFunction (); never happens, no error

  }

  This probably confused you more than helped but for purposes more undefined or null check is roughly the same.

  #3) If the clip of 'guyAtCampScene_mc' does not exist for a reason I don't not want the error code and the stop. I just check if it exists, and if I didn't remove the event (removeEventListener) loop and then put an end to the service if the code below it is not running. I don't want to try to run this code below the return; or it will error and stop, as shown.

  #4) Already answered, it is not username, but makes type Cast 'guyAtCameScene_mc' in a DisplayObject just parent course if it's a Sprite or MovieClip there is work. I don't know the method so I need to type cast for safety of. removeChild() will be available to the compiler.

• Look at a 'legacy' Mapping Tables

  In all of our existing applications of FDM, we had a Parent place where all other legacy data loading places their cards. The sole purpose of this place a Parent had to store cards for the other places of loading data. He did not receive an import Format and was not used to load the data from the target (HFM). When any user connected to one of these older applications FDM and sets his POV on any place he had been affected, he might go to the menu card and Discover cards.
  
  Now, we have a request for FDM which uses two localities of Parent to store cards for all other places of loading data. Yet once, those Parent sites are not used to load the data, but only card shop. Each Parent location provides maps for about 50% of the locations of load data. However, when a user connects to this new application, he cannot see the cards in one of its affected localities. It must be assigned to the location of the Parent and affect the POV of the location of the Parent to see the cards.
  
  Maps for other places of loading data into the new application process correctly. The only problem is that users cannot see their mapping tables unless they have defined their POV to the correct location of the Parent. Is there a setting that would allow a user to see the hereditary mapping tables when there are several places of Parent?
  
  Published by: Larry R on December 9, 2010 11:29

  Larry,

  In the Fusion version, security was added which required the user to have access to the location of the parent. This is necessary because an update of map in a place of the child has repercussions on technically the parent location. This change is a good thing.

  I've never met a problem where a user can not see the maps of a situation that is assigned to a parent. Are you sure that they are on the right place?