Question about HP Officejet 4355 All-In-One InkJet Printer

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Documentviewer is asking for CD-ROM

System.NullReferenceException: Object reference not set to an instance of an object.
at HP.CUE.Video.PlaybackControl.UpdateProgressBar()
at HP.CUE.Video.PlaybackControl._ProgressTimer_Tick(Object sender, EventArgs e)
at System.Windows.Forms.Timer.OnTick(EventArgs e)
at System.Windows.Forms.Timer.Callback(IntPtr hWnd, Int32 msg, IntPtr idEvent, IntPtr dwTime)

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  • oymanee May 11, 2010

    I need Driver

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Posted on Dec 02, 2008

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What is difference between a class and an object with respect to Java?


This kind of question is a test of your knowledge of the terminology associated with object oriented programming. You should note that this question could just as well be asked in the context of a C++ programmer interview, or any programming position that requires object oriented programming for that matter.
The terms 'class' and 'object' are definitely related to one another, but each term holds its own distinct meaning. Let's start out by explaining what the term "class" means in the context of OOP. The term 'class' refers to the actual written piece of code which is used to define the behavior of any given class. So, a class is a static piece of code that consists of attributes which don't change during the execution of a program - like the method definitions within a class.
An object is an instance of a class The term 'object', however, refers to an actual instance of a class. Every object must belong to a class. Objects are created and eventually destroyed - so they only live in the program for a limited time. While objects are 'living' their properties may also be changed signficantly.
An example will help clarify what we've said. Suppose we have a class called 'Animal'. All Animals have bodies and brains - and these could be the attributes of our fictional Animal class. We can also add some methods that would be common to all Animals - like "movement", because all animals can move (maybe you can think of a better example for methods, but hopefully you get the point). So, the idea you really want to enforce in your own mind is that this very general 'template' of an Animal does not change - it's simply just some lines of code that define the Animal class.
An instance of the Animal class would be a specific animal - like a lion, a cat, or a zebra. These instances of the Animal class would be called objects. Whereas the Animal class is a general concept, the instances of that class - the lions, cats, etc - take that general concept and create a real instance of it. That is why programmers define constructors for their classes - so that when someone wants to create an object of the class, he/she can just pass in the actual properties that he/she wants the object to have - like what kind of animal it is, the name, the weight, etc. So, you can think of a constructor as something that brings the class to life - which is why it is called a constructor, because it constructs a specific instance of a class.
Objects have a lifespan but classes do not And, as our Animal example clearly shows, every object has a lifespan associated with it - a cat or zebra can not live forever. And, the properties of those objects can change as well while they 'live'; if we have a 'size' variable defined in the class that would of course change as the cat object grows bigger.
Object versus class summary So, we can say that whereas a class is a general concept (like an Animal), an object is a very specific embodiment of that class, with a limited lifespan (like a lion, cat, or a zebra). Another way of thinking about the difference between a class and an object is that a class provides a template for something more specific that the programmer has to define, which he/she will do when creating an object of that class.
Objects have a lifespan but classes do not And, as our Animal example clearly shows, every object has a lifespan associated with it - a cat or zebra can not live forever. And, the properties of those objects can change as well while they 'live'; if we have a 'size' variable defined in the class that would of course change as the cat object grows bigger.
Object versus class summary So, we can say that whereas a class is a general concept (like an Animal), an object is a very specific embodiment of that class, with a limited lifespan (like a lion, cat, or a zebra). Another way of thinking about the difference between a class and an object is that a class provides a template for something more specific that the programmer has to define, which he/she will do when creating an object of that class.

Jul 16, 2014 | Computers & Internet

1 Answer

What is singleton model


The Java Singleton pattern belongs to the family of design patterns that governs the instantiation process. A Singleton is an object that cannot be instantiated. This design pattern suggests that at any time there can only be one instance of a Singleton (object) created by the JVM. You implement the pattern by creating a class with a method that creates a new instance of the class if one does not exist. If an instance of the class exists, it simply returns a reference to that object

Jul 20, 2010 | Sun Java Programming Language (cdj-275)

1 Answer

An unhandled exception has occured in a component in your application etc Object reference not set to an instance of an object. When I click on continue, document viewer fails to install. The message stays...


The problem occurs because Microsoft Data Access Components (MDAC) is not installed on your computer

To fix this problem, install MDAC on the computer. download MDAC from Microsoft Developer Network (MSDN) site:

(http://msdn2.microsoft.com/en-us/data/aa937695.aspx)

Jul 16, 2010 | Microsoft Windows XP Home Edition

1 Answer

Hp Printer CD ROM Problem


Unfortunately, this is a frustrating and widely reported issue. Apparantly the HP software is not compatible with Office.
If you have reinstalled the document viewer.msi file from your cd repeated times and you keep getting popups indicating its failure, you will need to uninstall the document viewer.
Here are the instrucitons, courtesy of Jasdev Singh:
">> If you have installed any all-in-one printer driver software then put the disc in
else follow Step 2:

Step 1:
>> Put the printer disc in and goto Setup folder and search for Document viewer folder.
You will find two files under that. Double click on DocumentViewer.msi and install that. if you right click you will get repair also.

Step 2:
>> if you dont have any disc then goto Control panel and select Add/Remove Program.
>> Remove DocumentViewer entry. "

If you can't uninstall from Add/Remove programs or don't find an entry for the document viewer there, go to this link and download the Windows Installer Clean Up utility Download, Install, and Run this application...
"
>> I am sure you can select DocumentViewer now and hit Remove button.

This will clear DocumentViewer from you computer."

Please also refer to this KB article for additional information about clearing your temp files, etc.

I hope this information allows you to resolve this issue. If you need further assistance, please post back with a comment to this thread.
If I've managed to answer your question or solve a problem, please take a moment to kindly rate this post....thanks!



Apr 16, 2009 | HP Photosmart C5180 All-In-One InkJet...

1 Answer

An unhandled exception has occured .......


An attempt was made in a program or script to use an object before creating the object. For example:

dim SomeObject as Object
SomeObject.attribute = "string value"

will generate thie error message because the SomeObject that is being referred to has not been created. For this, we need the New keyword:

dim SomeObject as New SomeObject
SomeObject.attribute = "string value"

will run without errors

Nov 19, 2008 | Microsoft Windows XP Home Edition

1 Answer

Have a error show up as HP image zone-error states X the program has encountered an unexpected error.: object reference not set to on instant of an object


this error is caused when i tried to bind data in grid view in visual studio 2005. the procedure which i followed are as follows, first i have selected choose data sourse in the grid view task and then i selected new data source. then in the data source configuration wizard i have selected database and moved further. then i have clicked the new connection button and entered all the details and clicked test connection, i get the message 'test connection succeeded' after that when i click ok in the add connection page i get the error 'Object reference not set to an instance of an object error'.

Aug 15, 2008 | HP Computers & Internet

1 Answer

Image zone plus


tell me camera model & if it having memory stick or not if ur havinf it then u can transfer it from memory stick also

Oct 15, 2007 | Microsoft Windows XP Home Edition

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