Access the parent class function

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• 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

• 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:

  

• 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:

  

• Not able to access the parent instance variable in outside of the methods in child

  Hello
  
  I don't get why I am not able to access the instance variable parent class apart from the example of the child class methods.
  

  class Parent
  {
       int a;
  }
  
  class Child extends Parent
  {
       a = 1; // Here i am getting a compilation error that Syntax error on token "a", VariableDeclaratorId expected after this token
       
       void someMethod()
       {
            a = 1;  // Here i am not getting any compilation error while accessing parent class variable
       }
  }

  Can someone let me know the exact reason for this, and what about the talks of error?
  
  Thank you
  Uday
  
  Published by: Udaya Shankara Gandhi on June 13, 2012 03:30

  You can only put assignments or expressions inside the methods, of the builders or the initializors class, or when you declare a variable.
  It has nothing to the child which stretches from Parent.

  class Parent {
      int a = 1;
  
      { a = 1; }
  
      public Parent() {
          a = 1;
      }
  
     public void method() {
         a = 1;
     }
  }
  

• To access the upper class instance variables

  Hello
  
  See the code provided below. If home * variable 'i' is not set to 4, the output will be 3, if it is set, it will be 4.
  My question is... Well, I don't know exactly, there would be a lot. All this is strange to me.
  (For example, it seems that for the super class constructor runs when I access an instance of her variable).
  Could someone explain this topic or maybe help me to direct to an article?
  

  public class TryThis {
      
      public static void main (String args[]){
  
           Child c = new Child();
           c.seeSuper();   
      }
  }
  
  public class Parent {
  
       int i;
       
       Parent(){
            i = 3;
       }
  }
  
  public class Child extends Parent{
  
       Child(){
            //i = 4;  //***
       }
       
       public void seeSuper(){
            System.out.println(super.i);
       }
                      
  }

  Note: Parent could also simply look like this:

  public class Parent {
       int i = 3;
  }

  I see now that it is wrong to use the word 'object '.

  No, it isn't.

  they are there for the child to use, object

  That's where you're going wrong. Don't think about "the parent" and "child object. There is only one object, and it is mentioned by "this". You should think about members of the base or the classes and members of the (current) derived class. They are all members of the 'object', but the members of the base class can be hidden by the current members of class with the same name. That's all. Nothing too special about it.

  but they aren't the fields of it.

  Yes they are, but if they are hidden by local declarations that they are not visible to 'this', only to 'super '.

• To access the Parent DataProvider ItemRenderer?

  It is possible to access the individual ItemRenderer is based on a data item for the Parent control?

  For example, I use control CheckBoxList of Alex Harui who uses his CheckBoxRenderer.  I want to be able to all the checkboxes to enable or disable.  I have added a new toggleAll function to CheckBoxList, which looks like this:

  
  public virtual function toggleAll(selected:Boolean):void
  {
       if (dataProvider == null)
            return;
       
       for each (var item:Object in dataProvider)
       {
            if (item == null)
                 continue;
           
            item.selected = selected;
       }
  
       invalidateProperties();
  }
  

  However, I think I really need to access the itemRenderer and set selected here instead.

  Try this post:

  http://blogs.Adobe.com/aharui/2010/01/checkboxes_in_datagrid_with_ch.html

• Access the ArrayCollection class MXML ActionScript collection?

  I have a MXML file that has a collection for my tree component arraycollection. I am overriding the updateDisplayList function to add lines to all of my nodes in the tree... However, I can't seem to understand how to access this ArrayCollection collection of inside the actionscript class?
  
  I tried the methods used to pass variables between two MXML files (like a popup window - which I've used in the past and it works very well).
  
  My actionscript class code is almost identical to this example here:
  
  http://www.iepl.NET/treeControlSample/treeControlSample.html
  
  In the example above, the data is static, but sometimes my data's going to change and I need to access the set dataProvider (collection ArrayCollection) in order to make the lines work well... This has been very frustrating for me! :)
  
  If someone knows a better way to reach gettign lines for brothers and sisters in a tree... Please let me know!
  
  Any help would be super duper awesome!

  I found the solution to this. My problem was similar to cheftimo was seen in this post:

  http://www.Adobe.com/cfusion/webforums/Forum/MessageView.cfm?forumid=60&CATID=585&ThreadId = 1367784 & enterthread = y

  The answer is to import the component you are trying to access the variable from and then call using mx.core.Application ' Application.application.'

  Thanks to Greg Lafrance!

• Hotmail 44 looks like your mother has not finished to set up parental controls for your account settings. Click "Access the parental control settings" to complete the process and access your account.

  I love how you get this error message, and then says that there is no support for this information.  You would think that if MS wrote this error message, they would assume someone would finally get it and need help.  Why I've bothered with this company I have no idea.

  All I want is to get my child HM account work. Ive clicked all this parental control I can find.  If this was the issue of the xbox, Id go immediately to gmail.

  Hello

  Had the same problem as the rest. All fixed now by:

  Abducted child security account for the family (Instructions in this thread)

  Account and went to outlook.com, let the updates.

  deleted the account from the local computer (Windows 8, users through the control panel * no * new user interface)

  Added and ensure that parental control is back on (it is by default)

  Can access the messages and followed the account. The account I had was old enough and not yet been used.

• Accessing the parent Collection

  Y at - it a Navto command or otherwise (yet) to return to a collection of parent?

  I am familiar with the go to URL command to access the home collection: goto://ApplicationViewState/library

  However, we would really like to be able to "get out" of an item to the collection parent without having to call the built upwards in the navigation bar.  Any help?

  Not yet, but it's on our list to address in the near future. We really want to get this in, as well as a way to link directly to the collections.

  Neil

• How to access the parent mc data

  I load an xml file in the parent movieclip.

  How can I access this variable in its child movieclip?

  Is there a way to define a public property in flash as in flex?

  One way is to target the parent, with something to the effect of: MovieClip (parent) .that_variable

• To access the parent tree itemClick data

  Hello!

  I have a tree that displays some parameters and values. When you click the value (non-dossier) I would like to have access to certain of its parent node, but what I got from the event data only gives me the content of the current node. How can I access its parent leave the handler?

  Tree.getParentItem (item: Object)

• How to access the parent container?

  I have the following code
  
  newButton = new Button();
  newButton.label = 'Submit ';
  newButton.id = "btn_" + arrPerformance.getItemAt (x) .fld_question_number;
  newButton.addEventListener ("click", saveAnswer);
  
  newRichTextEditor = new RichTextEditor();
  newRichTextEditor.id = "answer_" + arrPerformance.getItemAt (x) .fld_question_number;
  newVBox.addChild (newRichTextEditor);
  newRichTextEditor.toolbar.addChild (newButton);
  
  As you can see, I added a button to the toolbar of the rich text box control.
  
  The "saveAnswer" event listener saves the content of the rich on the db text control.
  
  But I can't understand how to reference the container of rich text.
  If I use event.target.parent it gives me only the toolbar!
  
  Also note that the form has several of them, thats why he is in the action script.
  So I need to be able to access the rich text box 'textarea' and id, so I can go to the SWC.
  
  Ken

  Thank you for that.

  I missed the controlbar, so I was a 'parent' call for short.

  Ken

• How to access the inner class fields in refleciton?

  I have:
  

  class Outer {
      class Inner {
          int field;
      }
      Inner inner;
  }

  I use reflection to get the Outer.field field and recognize that it is a reference to the inner class. What should I do to get the inner.field (or something that looks remotely like this at Inner.field)?
  
  We would like to

  Well, precedent is too messy for me even follow my example. I've simplified it, and I think I found where my error was. I suspect that you were doing a similar error:

  package scratch;
  
  import java.lang.reflect.Field;
  
  public class Scratch {
  
    public static void main(String[] args) throws Exception {
      new Scratch().go();
    }
  
    void go() {
      Outer1 o1;
  
      Field[] fields = Outer1.class.getDeclaredFields ();
  
      for (Field field : fields) {
  
        final String fn = field.getName ();
        final Class ft = field.getType ();
        final Class fc = field.getClass ();
        final Class fdc = field.getDeclaringClass ();
  
        System.out.println ();
  
        System.out.println ("Outer1 field : " + fn);
  
        System.out.println ();
  
        System.out.println ("field's class (field.getType()) : " + ft.getName());
        System.out.println ("field.getType().isMemberClass() (" + ft.getName() +" isMemberClass()) : " + ft.isMemberClass ());
        System.out.println ("field.getType(). getDeclaringClass() (" + ft.getName() + "'s declaring class) : " + fdc);
  
        System.out.println ();
  
        System.out.println ("field.getClass()) : " + fc.getName());
        System.out.println ("field.getClass().isMemberClass() (" + fc.getName() +" isMemberClass()) : " + fc.isMemberClass ());
        System.out.println ("field.getClass().getDeclaringClass() (" + fc.getName() + "'s declaring class) : " + fc.getDeclaringClass ());
  
        System.out.println ();
  
        System.out.println ("Note the difference between Field.getClass() (" + field.getClass () + ") and Field.getType() (" + field.getType() + ")");
  
        System.out.println ();
      }
    }
  }
  
  class Outer1 {
    class Inner1 {
    }
  
    Inner1 i1;
  }
  
  Outer1 field : i1
  
  field's class (field.getType()) : scratch.Outer1$Inner1
  field.getType().isMemberClass() (scratch.Outer1$Inner1 isMemberClass()) : true
  field.getType(). getDeclaringClass() (scratch.Outer1$Inner1's declaring class) : class scratch.Outer1
  
  field.getClass()) : java.lang.reflect.Field
  field.getClass().isMemberClass() (java.lang.reflect.Field isMemberClass()) : false
  field.getClass().getDeclaringClass() (java.lang.reflect.Field's declaring class) : null
  
  Note the difference between Field.getClass() (class java.lang.reflect.Field) and Field.getType() (class scratch.Outer1$Inner1)
  

  field.getClass () does NOT get the class of the field. It get the class of the field object that points to the field reference variable, which is always java.lang.reflect.Field. To get the class of the field, use field.getType ().

  Do you see the difference?

  Edited by: jverd February 5, 2011 17:18