Why Java provides Object cloning even if there is Object reference variable

In both cases original value get changed. What is the difference between these (clonable interface & Object reference variable)

Cloneable is a way to make a copy of an object, so that you now have two objects, usually with the same state. Assigning the value in one reference variable to another variable (I can only assume that's what you're talking about, as your question is not clear at all) does not create another object.

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How to create a local object reference variable in teststand sequence file programatically using C#

I want to create a local object reference variable in a TestStand sequence file programatically using C#.

Hi,
Accoring to your reply in this Thread
http://forums.ni.com/ni/board/message?board.id=330&thread.id=26984
Just try this example. There you will create a numeric variable during excuting a sequence!
Hope this is what you are looking for.
Please attach all your questions here.
juergen
=s=i=g=n=a=t=u=r=e= Click on the Star and see what happens :-) =s=i=g=n=a=t=u=r=e=
Attachments:
CTestStandDialog.zip ‏31 KB

Is down casting possible in Java objects(reference variables)?

I hope, Java up casting and down casting is possible in Java primitive variables like int float and so on.
My doubt is,Does in object of Java(reference variables) support down casting?

makpandian wrote:
the ques i asked here is popped from my mind.We know that.
But i did not get answer .Because you didn't do any research.
Than s why i ask this here..That's the wrong approach. Do some research first. Use google, a textbook, a tutorial, the JLS, write some code, etc. etc.
After spending time and effort doing that, if you still have questions, indicate clearly what you read and what part you didn't understand. The way you're doing it is NOT an effective way to learn, and it's a waste of everyone's time.

A simple teststand application passing object reference to C#

Hi,
I have a .NET application written in C# which has a UI with NationalInstruments.TestStand.Interop.UI.Ax.AxExpressionEdit controls. This UI is invoked by a custom step in TestStand. One of the values, entered by user in the UI is a object reference variable created in a previous step. I need to store the values entered in the UI during the edit mode of the step, into the TestStand Step variables. And during the run mode i use these values to execute the logic in C#.
The problem is during edit time, the object reference variable, entered in the UI, has no value. It is null. So there is no use storing it at edit time. During the runtime i am trying to retrieve the value of the object reference variable using GetValInterface(...) and GetValIDispatch(..) methods of PropertyObject. But the object returned to C# is of type System.__COMObject wherease in TestStand that object reference is of type .NET.
I don't know how a .NET object reference is converted to COM object when it is returned to .Net function.
Also is there any other method to send this object reference variable's (whose value is '.NET' in previous step itself) value to .NET as a .NET object only so that i can typecast to appropriate type and start using.
Thanks.
Please let me know if anything is not clear.
I have attached the .Net project, .ini file for the custom step and a example sequence file.
Attachments:
CCustomStepObj.zip ‏23 KB

Hello Shivapriya,
The example you've sent doesn't compile. And it without it I'm affraid I do not understand the problem you're describing.
You've given references to libraries that you've not attached with your files.
For the C# I see these are the
IADCore.dll
InstrimentInterfaces.dll
TestStand also seems to want to reach for the assembly named TestSystem.dll.
I can only tell you that I have used successfully in the past the Variables in TestStand to hold .NET object references, and call methods on them and I experienced nothing similar that you describe, but I don't quite follow what is the problem here, as I can't use the example.
I would appriciate if you cold narrow down the example to 1 dll or something where the problem occurs and than resend it.
Regards,
Maciej
Message Edited by Mac671 on 09-28-2009 02:59 AM

To pass parameter values to the object reference of action step in sequence file of teststand programatically using C#.

//Initialize the Engine
            EngineClass myEngine = new EngineClass();
            myEngine.LoadTypePaletteFilesEx(TypeConflictHandlerTypes.ConflictHandler_Prompt, 0);
            Step myStep = myEngine.NewStep(AdapterKeyNames.DotNetAdapterKeyname,StepTypes.StepType_Action);
            myStep.Name = "object";
            DotNetModule dotnetmodule = myStep.Module as DotNetModule;
            dotnetmodule.SetAssembly(DotNetModuleAssemblyLocations.DotNetModule_AssemblyLocation_File,@"C:sequence.dll");
            dotnetmodule.ClassName = "CN";
            dotnetmodule.MemberType = DotNetModuleMemberTypes.DotNetMember_GetProperty;
            dotnetmodule.MemberName = "ISI";
mySequence.Locals.NewSubProperty("object", PropertyValueTypes.PropValType_Reference, false, "", 0);
Sequence mySequence = myEngine.NewSequence();
            mySequence.Locals.NewSubProperty(varName, PropertyValueTypes.PropValType_Reference, false, String.Empty, 0);
mySequence.InsertStep(myStep, 0, StepGroups.StepGroup_Main);
            SequenceFile seqFile = myEngine.NewSequenceFile();
            seqFile.InsertSequence(mySequence);
seqFile.Save("C:\\mySeq.seq");
I have done this,dynamically creating a sequence file in teststand programatically through c#.
Problem is
1.I created an action step and object Reference variable for the step, but i am not able to pass parameter values to the objectReference
2.I am not able to load the sequence in to the main Sequence of the sequence file in the teststand. How can I do these two things.

Hi,
have you ever followed on my Links ?!?!?
If not please jump to this one
http://forums.ni.com/ni/board/message?board.id=330&thread.id=26880
and read the the answer from Mannoch
starting with this words:
Anthony -
Currently, functionality for retrieving the Metadata Token for a class constructor or member is not fully provided in the TestStand .NET Adapter API. The DotNetModule.GetConstructorMetadataToken() and DotNetModule.GetMetadataToken() methods only return the correct Metadata Token when the member/constructor prototypes have already been loaded. Thus, in the case of your code, when you call DotNetModule.GetMetadataToken(), the method is returning -1 because the member prototype for the Step you are referring to has not yet been loaded.
That means have to do a workaround for your stuff.
Juergen
=s=i=g=n=a=t=u=r=e= Click on the Star and see what happens :-) =s=i=g=n=a=t=u=r=e=

Any Resources for Learning Object Reference in TestStand?

Hi All,
I have been using Active X servers in TestStand for several years and now some of the newer stuff I am being supplied with is Dot Net objects. Does anyone know of somewhere to learn the correct way to use object references in TestStand. I don't understand when you should create a new object vs just using an existing object reference. I also would like to understand how to use an object reference variable.
I looked at the TS examples, but there is not an explanation.
Any ideas?
TIA,
Jim

Jim,
You may try reading through the NI TestStand Advanced Architecture Series, specifically Chapter 2: Using the NI TestStand Object Model. These may shed some light on the issue.
Regards,
Steven Zittrower
Applications Engineer
National Instruments
http://www.ni.com

Debug object references

I have a reference to a .net list.
Is it possible to "debug the content" of the list during runtime ? i.e. can i somehow "expand the view" to see properties ?

One way would be to use .NET action steps to get the values into local variables. You can use mscorlib as the assembly and call Array.GetValue to get the individual values from the array then use another .NET step with your assembly and the USB_SA.Peak data type with each element to get properties, fields, or call methods on that type. There are other ways too, such as if the type USB_SA.Peak is really a struct (i.e. value type), then you can create an equivalent TestStand custom data type for it and have the .NET adapter do the data conversion for you to get the values into a local variable that is an array of that type rather than using an Object Reference variable. It really depends on what you are doing and how your .NET types are defined.
Hope this helps,
-Doug

Serialization of Object reference

Hi,
I'd like to serialize (or store in some way) a reference I have on
an Object. This reference is coming from a stateful bean, so it's
an Object instance and not serializable. The idea is to be able to
retreive the reference on the bean after a failure of the client.
Thanks for your help.
--MA

If the reference is not serializable then what you can do is
override writeobject() and readObject() method. I the write object write down information regarding that reference(it depends on your application). Stateful bean construct details.
In readObject() read those details and get a reference to it through JNDI and set that reference to your object reference variable.
This is Custom Serialization.

Why java is called pure object oriented.

i know that java is called as pure object oriented language.
why it is called so even though it has primitive datatypes and also it doesnot support multiple inheritance completely. it only supports in the case of interfaces but not in the case of classes. then why it is called pure object oriented.

Its because you cannot write an executable java program without creating an object. Well, you can:
public class a
public static void main( String a[] )
}In contrary to C++, there can be no variables or functions in the wild (outside a class).
You can not create an executable java program without creating a class (but not forcibly its instance, an object.)
The "pure object oriented" wording in this sense has not really much importance, it is rather a marketing ploy.

HT204088 The directions you provided above doesnt even work! when I selected "Click to open your account", there is an ERROR message and takes me to no where! when I try to access my itunes account, it says I have no history?

The directions you provided above doesnt even work! when I selected "Click to open your account", there is an ERROR message and takes me to no where! when I try to access my itunes account, it says I have no history?

You are not able to view purchase history on your iOS device. You may only re-download previous purchases from the iOS device.
To review your iTunes Store account's purchase history, follow the steps in this article from a computer only:
Seeing your iTunes Store purchase history and order numbers
http://support.apple.com/kb/HT2727

In addition to my home page, every time I start Firefox a tab opens with notifacation of an updated addon. Why does this tab continue to appear even though there is no updated version of the addon?

In addition to my home page, every time I start Firefox a tab opens with notification of an updated addon. Why does this tab continue to appear even though there is no updated version of the addon?

See these articles for some suggestions:
*https://support.mozilla.com/kb/Firefox+has+just+updated+tab+shows+each+time+you+start+Firefox
*https://support.mozilla.com/kb/How+to+set+the+home+page - Firefox supports multiple home pages separated by '|' symbols
*http://kb.mozillazine.org/Preferences_not_saved

Why java is called as true object oriented language?

HI Friends,
Though few oops concepts is not supported , why java is called as truly object oriented language and C++ as not a purely object oriented language???? Please, if any one know , give me the answer.
Thanks to all.

few oops concepts is not supportedwhich concepts?
as far as i know...to be OO, you must supports
encapsulation, abstraction, inheritancxe, composition (aggretration, et all) and polymorphism. Java supports all those comcept..now..Java is a hybrid due to what Jverd has pointed out.
the only pure OO language that i know of is SmallTalk. they have Meta class that can create Class object. and all their primitaives are object.
C# comes close, but their Class are not object.

Why isn't Java's Object class abstract?

Why isn't java's Object class made as abstract class.

manoj.java wrote:
Why isn't java's Object class made as abstract class.The only good reason I can think of is that, back in the days prior to Java 5 and the incorporation of java.util.concurrent, bare Objects are useful as thread synchronization monitors (wait(), notify(), notifyAll()).
--p

Is there any log of object-generating ? - why is an object generated?

is there any log of object-generating ? -
why is an object generated?
in Table REPOLOAD, i can see that an object / program is generated (SDAT, STIME)
is there any log-file, where i can see, why this object is forced to be generated ?

it is a JavaBean class that implements Serializeable. suppose i have a method called copyObject(Object o) that returns a copy of o
public Object copyObject(Object o)
Object newObject = null;
Class c = o.getClass();
newObject = c.newInstance(c.getName());
PropertyDescriptor p[] = Introspector.getBeanInfo(o.getClass()).getPropertyDescriptors();
for (int i = 0; i < p.length; i++) {
//this is the part i am not really certain, how do i read value from o, so i can set it to newObject for each element
//String name = p.getName();
//String value = p[i].getReadMethod() .;
p[i].getWriteMethod().invoke(newObject, value);
//how do i use the introspector to invoke method to copy from o to newObject?
return newObject;

Are there any problems to expect when srializing java.lang.Object?

When having code like this:
public class SomeClass implements Serializable{
private final String NULL_CONSTANT="dmmystring";
private Object result=new String(NULL_CONSTANT);
...whatever
Class java.lang.Object is not implementing the Serializable Interface. In practise, this works fine however, I would like to understand this question. Will serialization work in every case as long as result is set to a serializable type?

hi,
If the object does not implement the Serilizable marker interface, then when you try to serialize the object, you will get a NotSerializableException. Also when you try to serialize a object, java will check to see if any variables contained in the object are also serializable and if so it serializes the same so in effect all attributes of the object must be either serializable or marked transient. When you mark a variable as transient, for eg
transient Vector v;
this object will not be serialized.
you might want to check out the article at
http://java.sun.com/docs/books/performance/1st_edition/html/JPIOPerformance.fm.html#11352
It contains ways to improve serialization, but it will also be useful in understanding the Serialization concepts as such...
hope this helpzz
cheerz
ynkrish

Why Java provides Object cloning even if there is Object reference variable

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