Cannot be implicitly cast to Bitmap in class?

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• 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

• Question about cast of more generic class

  I refnum controls and pages refnum and I want to know where is the best:

  (1) let LabVIEW doing work

  

  or (2) use the 'more generic class type conversion.

  

  In both cases the VI works fine.

  Thank you

  Jean-Marc

  'that's better... »

  I can't say definatively, but I've generally will do top-cast to build a table that you have illustrated LV.

  EDIT

  I just noticed your case apperas to have 50 more digital cases. What you do with this code? We may be able to offer alternatives (maybe).

  Ben

• Cannot convert oracle.jbo.domain.Number to class the class java.lang.Long in EL

  I have this error:

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  at com.sun.el.lang.ELSupport.equals (unknown Source)

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  at org.apache.myfaces.trinidad.bean.FacesBeanImpl.getProperty(FacesBeanImpl.java:73)

  to oracle.adfinternal.view.faces.renderkit.rich. LabeledInputRenderer.isDisabled (LabeledInputRenderer.java:285)

  My question is how do I find in my page jsff?  I see that it is on a property of disabled but I don't know which and there are many on this page.  I think it's one that looks like this: disabled = ' #{bindings. " "{PGSchedType.inputValue No 5}.  If my different EL expression?

  Thank you.

  Rudy

  JDev 11.1.2.4.0

  Hi Rudy,.

  I guess that you have spotted it right. Instead of 5 in your disabled property, use '5'

  
  

  I mean, just surround it with quotes like below
  

  
  

  disabled="#{bindings.PGSchedType.inputValue ne '5'}"
  

  Thank you

  SAIF

• is it possible to transform a bitmap/bitmapData class

  Is there a way I can transform the content of a class to a bitmap and use this image as many times as I want. In my case, I create this class

  public class CreateRow_Col extends Sprite {
  
  
                      private var bgArray:Array = new Array();
                      private var myContainer:Sprite = new Sprite();
                      private var _Pat1:BitmapData = new Pattern1();
  
  
  
  
                      public function CreateRow_Col() {
                                var bgClip = new Bitmap(_Pat1);
                                var i:int = 0;
                                var j:int = 0;
                                while (bgClip.x < stage.stageWidth) {
                                          bgClip = new Bitmap(_Pat1);
                                          while (bgClip.y < stage.stageHeight) {
                                                    bgClip = new Bitmap(_Pat1);
                                                    myContainer.addChild(bgClip);
                                                    bgClip.x = bgClip.width * i;
                                                    bgClip.y = bgClip.height * j;
  
  
                                                    j++;
                                          }
  
  
                                          j = 0;
                                          i++;
                                }
                                addChildAt(myContainer,0);
                      }
  
  

  and then call it from the mainClass of the FLA

                           private var bf:CreateRow_Col = new CreateRow_Col();
                      private var bf2:CreateRow_Col = new CreateRow_Col();
  
  
                      public function MainClass_Test() {
                                bf.x = 50;
                                addChild(bf);
                                bf2.x = 150;
                                bf2.y = 350;
                                addChild(bf2);
                      }
  
  

  But if I want to do like 500 instances of the class that will make the CreateRow_Col calculate 500times scene and fill it 500 times? or it will not?

  and even if it is not possible to make a class for bitmap and use this image as many times as you want.

  Looks like you need to use the class graphics capabilities, particularly beginBitmapFill() method.

  Here is the documentation of the Graphics class:

  http://help.Adobe.com/en_US/FlashPlatform/reference/ActionScript/3/Flash/display/graphics. HTML #beginBitmapFill)

  But first, you class CreateRow_Col will not work. You are referring to the scene in the constructor. Stadium is available ONLY when object is placed on the display list, UNLESS you have the reference to the scene when running.

  Anyway, if your need is to tiles with the same BitmapData Sprite - you don't need to jump through all these hoops. Try this code:

  package
  {
            import flash.display.Sprite;
            import flash.events.Event;
  
            public class CreateRow_Col extends Sprite
            {
                      public function CreateRow_Col()
                      {
                                addEventListener(Event.ADDED_TO_STAGE, draw);
  
                      }
  
                      private function draw(e:Event):void
                      {
                                removeEventListener(Event.ADDED_TO_STAGE, draw);
                                graphics.beginBitmapFill(new Pattern1(), null, true, true);
                                graphics.drawRect(0, 0, stage.stageWidth, stage.stageHeight);
                                graphics.endFill();
                      }
            }
  }
  

  The use is the same as you showed in MainClass_Test.

  Post edited by: Andrei1

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  Hello

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  MeterTypeEO

  ID	DBSequence	ID	NUMBER
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  Type	String	TYPE	VARCHAR2 (16)

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  Please see the attached screenshots to make it clearer what I mean.

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• How he handles the labview to more generic class

  It's just a matter for my own knowledge of curious nerd. If you, say, have a cluster that contains a string, a Boolean value, and a digital control, a common method to reference the controls in the cluster is to create a cluster of reference and then to get the array of control from a property node. So let's say I wanted to put the Boolean value true, you can auto control array index and cast in more specific class boolean and set value via the property node (see below).

  

  Now my question is, to place controls of different types in a table must be returned by the property node, they must all be of the same class. How LabVIEW manages it? He cast as a more generic class backstage? If so, how this work because it is generally dangerous to come back from a class derived from a base class because the data can or will be lost.

  Furthermore, a standard molded type takes just a binary model and interperates as differently it based on the data type. So how is "of a more specific class" able to raise an error if a generic control reference cannot be transformed into a class more specific. For example, in the attached photo, a control string reference would be mistake out there, but how? They are all classes of generic control when they get out of the property node. Is there some type of indicator in the generic control reference indicating the type? Maybe I think about this fundemtally wrong. All I can think is that the more specific / are more generic vi no type casting (which I guess they are not because it has separate type cast feature).

  Can someone explain how this all works. Inquiring minds want to know.

  for (imstuck) wrote:

  Now my question is, to place controls of different types in a table must be returned by the property node, they must all be of the same class. How LabVIEW manages it? He cast as a more generic class backstage? If so, how this work because it is generally dangerous to come back from a class derived from a base class because the data can or will be lost.

  Furthermore, a standard molded type takes just a binary model and interperates as differently it based on the data type. So how is "of a more specific class" able to raise an error if a generic control reference cannot be transformed into a class more specific. For example, in the attached photo, a control string reference would be mistake out there, but how? They are all classes of generic control when they get out of the property node. Is there some type of indicator in the generic control reference indicating the type? Maybe I think about this fundemtally wrong. All I can think is that the more specific / are more generic vi no type casting (which I guess they are not because it has separate type cast feature).

  Can someone explain how this all works. Inquiring minds want to know.

  I don't know all the details, but I would say you got it mostly right - there is an implicit conversion to a more generic type.  You will see this in several places in LabVIEW, for example, you can wire references to different types of controls in "table to build" to get a picture of their more specific common parent.  Because you're only casting reference - not the data that it contains, there is no loss of data.  A LabVIEW reference is just an I32 is (I assume) an index into a lookup table somewhere.  The value of this I32 does not change when it is converted into a more generic reference.  When you do "to more specific Type", LabVIEW raises this reference in the table and uses the data it found to determine if she can make the cast.  Who help me?

• ClassCastException in the custom class loader

  I created a custom class Leon.
  
  CCL ClassLoaderDemo = new ClassLoaderDemo(); assume that it works very well
  CLAS class = ccl.loadClass ('com '' ' MyObject');
  
  com MyObjectSuperClass o1 = (com. MyObjectSuperClass) clas.newInstance ();
  
  Now I want to get the object responsible for MyObjectSuperClass which is super class if MyObject. But I'm getting the following exception
  
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  Help, please.

  821458 wrote:
  My requirement is the class MyObject needs to be loaded by my client class loader. If you say that let the superclass (MyObjectSuperClass) be in the class path and let the class system charge charger, then usually it be a problem

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  MyObject loaded by the custom class loader, its super class loaded by the system class loader, I will be able to cast then.

  Yes, you will be able to cast to the upper class, then.

  It is not similar to the statement "MyObject loaded by the class loader and custom class system are different and we cannot throw.

  No, it isn't. your confusion is due to the fact that you don't seem to understand that you can have a class hierarchy that spans the Chargers of classes. This should be obvious because each object hierarchy extends eventually object, which is always in the system class loader. Therefore, you can always convert any instance of any class loader "Object". in the same way, you can have MyObjectClass in your chargers personalized classes and MyObjectSuperClass in the system class loader. You can instantiate an instance of MyObjectClass to aid reflection on your custom class loaders and assign it to a reference of the type MyObjectSuperClass. This is how pretty much any plugin system is implemented (the API is in the 'main' class loader and the implementation is in a nested class or custom ClassLoader).