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   ► KBRole-Based T...Coding & OO   Print This     

Coder KB: Coding & OO Topic

Programming ImageCoding Techings * OOP * Structured Programming

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56 Articles Found in the Coding & OO Topic  (or one of the sub-topics in bold above)

  KB Article    

Adam Lum
1. A Better .NET Serial Port Control http://www.codeproject.com/KB/showcase/SerialPortDotNet.aspx
Posted to KB Topic: General .Net Concepts
10 years ago, and updated 10 years ago

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Mike Prestwood
2. Abstract Class / Abstract Member

An abstract class member is a member that is specified in a class but not implemented. Classes that inherit from the class will have to implement the abstract member. Abstract members are a technique for ensuring a common interface with descendant classes. An abstract class is a class you cannot instantiate. A pure abstract class is a class with only abstract members.

Posted to KB Topic: Object Orientation (OO)
10 years ago, and updated 9 years ago
(4 Comments , last by Willie_M._Tr.W )

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Mike Prestwood
3. Aggregation

Aggregations indicate a whole-part relationship, and are known as "has-a" or "is part of" relationships. An Aggregation relationship is indicated by a line with a hollow diamond.

Posted to KB Topic: Object Orientation (OO)
10 years ago, and updated 9 years ago

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Mike Prestwood
4. An Introduction to Object Orientation Overview and introduction to object orientation. When you analyze, design, and code in an OO way, you "think" about objects and their interaction. This type of thinking is more like real life where you naturally think about how "this object" relates to "that object". Classes represent the "design" of an existing object. The values or properties of an existing object is it's current state. When designing classes, OO supports many features like inheritance (like real-life where you inherit your parents characteristics), encapsulation (hiding data), and polymorphism (the ability of one thing to act like another or in different ways).
Posted to KB Topic: Object Orientation (OO)
15 years ago, and updated 9 years ago
(4 Comments , last by mprestwood )

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Mike Prestwood
5. API API is an acronym for application programming interface. The Windows API is the set of DLLs that makes up Windows. It comprises all the functions, messages, data structures, data types, statements, and files that a programmer needs for developing Windows applications.
Posted to KB Topic: General Coding Concepts
15 years ago, and updated 10 years ago

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Mike Prestwood
6. Array A data type that is a collection of variables (much like a table is a collection of fields). There are two types: fixed and resizable. A fixed array has a predetermined--by the programmer--number of elements. A resizable does not; therefore you need to set its size before using it.
Posted to KB Topic: General Coding Concepts
15 years ago, and updated 10 years ago

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Wes Peterson
7. ASP.NET Interview Questions http://blogs.crsw.com/mark/articles/254.aspx
Posted to KB Topic: General .Net Concepts
9 years ago

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Mike Prestwood
8. Associative Array A set of unique keys linked to a set of values. Each unique key is associated with a value. Think of it as a two column table. MyArray['CA'] = 'California' MyArray['AR'] = 'Arizona'
Posted to KB Topic: General Coding Concepts
10 years ago, and updated 10 years ago

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Mike Prestwood
9. BDE Alias A BDE Alias or alias refers to a database location. For Paradox, dBASE, and other local tables, the location of the database is the location of the data files. You manage your aliases using the Borland Database Engine (BDE) located in your Control Panel.
Posted to KB Topic: Borland Database Engine
11 years ago, and updated 10 years ago

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Wes Peterson
10. BDE Broken? Recent Microsoft Betas may be the culprit

We encountered a situation in which programs that use Borland's BDE suddenly stopped working on some of our machines. The really helpful error message was "Operation not applicable!" (The error code is 10756)

Posted to KB Topic: Borland Database Engine
12 years ago, and updated 9 years ago

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Mike Prestwood
11. BDE on Terminal Server

BDE Error:

Database Engine Error
Cannot find Engine configuration file.
BDE Error: 8452 [$21][$ 4]

Posted to KB Topic: Borland Database Engine
9 years ago

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Mike Prestwood
12. Black Box The term black box refers to not being able to see what is within the box. For example, in coding, you do not need to concern yourself with the details of what happens when you call a method, you simply use the method, the black box, to do the thing you wanted it to do. This is also called encapsulation.
Posted to KB Topic: General Coding Concepts
11 years ago, and updated 10 years ago

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Mike Prestwood
13. Borland Database Engine 5.202

Download BDE 5.202 (includes a small BDE Information utility for testing the installation).

Posted to KB Topic: Borland Database Engine
11 years ago, and updated 17 months ago
(15 Comments , last by Rodney.R2 )

Download

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Mike Prestwood
14. Branching: Frequent Conditions First

Most languages support a branching mechanism like if a..elseif b..elseif c. If a evaluates to true, b and c will not execute. The tip is to sort your branching conditions by most to lease used for faster code.

Posted to KB Topic: General Coding Concepts
10 years ago

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Daniel Fought
15. Class A collection of related fields, properties, methods, and events.
Posted to KB Topic: General .Net Concepts
10 years ago

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Mike Prestwood
16. Class Constructor

Constructors are called when you instantiate an object from a class. This is where you can initialize variables and put code you wish executed each time the class is created. When you initially set the member fields and properties of an object, you are initializing the state of the object. The state of an object is the values of all it's member fields and properties at a given time.

Posted to KB Topic: Object Orientation (OO)
9 years ago
(1 Comments , last by DanJ..N )

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Mike Prestwood
17. Class Destructor

A special class method called when an object instance of a class is destroyed. With some languages they are called when the object instance goes out of scope, with some languages you specifically have to call the destructor in code to destroy the object, and others use a garbage collector to dispose of object instances at specific times.

Desctructors are commonly used to free the object instance but with languages that have a garbage collector object instances are disposed of when appropriate. Either way, destructors or their equivalent are commonly used to free up resources allocated in the class constructor.

Posted to KB Topic: Object Orientation (OO)
9 years ago, and updated 9 years ago

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Mike Prestwood
18. Class Helper

A. In Dephi, class helpers allow you to extend a class without using inheritance. With a class helper, you do not have to create and use a new class descending from a class but instead you enhance the class directly and continue using it as you always have (even just with the DCU).

B. In general terms, developers sometimes use the term to refer to any class that helps out another class.

Posted to KB Topic: Object Orientation (OO)
9 years ago, and updated 9 years ago

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Mike Prestwood
19. Class Visibility Specifiers In OOP languages, members of a class have a specific scope that indicates visibility. Standard visibility includes private, protected, and public. Private members are usable by the defining class only (fully encapsulated). They are invisible outside of the class except by friendly classes. Protected members are usable by the defining class and descendant classes only (plus friendly classes). Public members are usable wherever its class can be referenced.
Posted to KB Topic: Object Orientation (OO)
10 years ago

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Mike Prestwood
20. Code Contract

A.k.a. Class Contract and Design by Contracts.

A contract with a method that must be true upon calling (pre) or exiting (post). A pre-condition contract must be true when the method is called. A post-condition contract must be true when exiting. If either are not true, an error is raised. For example, you can use code contracts to check for the validity of input parameters, and results

An invariant is also a code contract which validates the state of the object required by the method.

Posted to KB Topic: Object Orientation (OO)
9 years ago, and updated 9 years ago

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Mike Prestwood
21. Composition A composite relationship means that a class cannot exist by itself. It must exist as a member of another class. A composite relationship is indicated by a solid line with a solid diamond head pointing to the part class. Alternatively, you can show this relationship graphically with the part class nested in the whole class.
Posted to KB Topic: Object Orientation (OO)
10 years ago, and updated 10 years ago

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Mike Prestwood
22. Computer Language Constants

A constant is just like a variable (it holds a value) but, unlike a variable, you cannot change the value of a constant.

Posted to KB Topic: General Coding Concepts
10 years ago

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23. Computer Language Operator A language symbol used for assignment, comparison, computational, or as a logical.
Posted to KB Topic: General Coding Concepts
10 years ago

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Mike Prestwood
24. Computer Language Statement An elementary instruction or other elementary component in a high-level programming language. When documenting a programming language, tech writers usually separate statements from operators, functions, procedures, and objects.
Posted to KB Topic: General Coding Concepts
10 years ago

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25. Encapsulation Hidden data and methods. Encapsulation is the hiding of data and code and is often called the "black box" approach, since users of a class can't see inside the class (they can only see the class' public interface).
Posted to KB Topic: Object Orientation (OO)
10 years ago

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Mike Prestwood
26. Event Handler

In computer programming, an event handler is part of event driven programming where the events are created by the framework based on interpreting inputs. Each event allows you to add code to an application-level event generated by the underlying framework, typically GUI triggers such as a key press, mouse movement, action selection, and an expired timer. In addition, events can represent data changes, new data, etc. Specifically, an event handler is an asynchronous callback subroutine that handles inputs received in a program.

A custom event is a programmer created event. For example, you can contrast an event handler with a member event, an OOP concept where you add an event to a class.

Posted to KB Topic: General Coding Concepts
9 years ago

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27. How to check what BDE version is installed.

Q. I've updated my BDE from version 5.01 to version 5.2.0.2 but the About BDE Administrator dialog still shows version 5.01?

A. Your update may have taken. Updates typically just replace the DLLs the BDE uses so you may have the latest installed.

Version Information
To see what version of the BDE engine you "actually" have installed, you need to look at the Version Information from within the BDE Administrator. Select Object | Version Information... to see the DLL version numbers

Posted to KB Topic: Borland Database Engine
10 years ago, and updated 10 years ago
(5 Comments , last by PatriciaJ.B )

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28. Inheritance

The concept of a class makes it possible to define subclasses that share some or all of the main class characteristics. This is called inheritance. Inheritance also allows you to reuse code more efficiently. In a class tree, inheritance is used to design classes vertically. (You can use Interfaces to design classes horizontally within a class tree.) With inheritance, you are defining an "is-a" relationship (i.e. a chow is-a dog). Analysts using UML call this generalization where you generalize specific classes into general parent classes.

Posted to KB Topic: Object Orientation (OO)
10 years ago, and updated 9 years ago

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29. Inline Routines

Instead of calling a routine, you move the code from the routine itself and expand it in place of the call. In addition to manual inlining, some languages support automatic inlining where the compiler or some other pre-compiler decides when to inline a code routine. Also, some languages allow for developer defined inlining where the developer can suggest and/or force the inlining of a code routine. Inlining can optimize your code for speed by saving a call and return, and parameter management.

Posted to KB Topic: General Coding Concepts
9 years ago

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Wes Peterson
30. Installing BDE using Merge Modules The new and "approved" way to install the BDE is by way of mege modules. This is quite a bit different than the traditional ways of using a pre-made program, or incorporating BDE Cab files (from, say, your Delphi installation). Caveat: This is new news for me, and I don't claim to know or understand everything there is to know on this topic but I do have some helpful findings for you.
Posted to KB Topic: Borland Database Engine
10 years ago, and updated 9 years ago
(2 Comments , last by Wes )

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Mike Prestwood
31. Interface

An element of coding where you define a common set of properties and methods for use with the design of two or more classes.

Both interfaces and abstract classes are types of abstraction. With interfaces, like abstract classes, you cannot provide any implementation. However, unlike abstract classes, interfaces are not based on inheritance. You can apply an Interface to any class in your class tree. In a real sense, interfaces are a technique for designing horizontally in a class hierarchy (as opposed to inheritance where you design vertically). Using interfaces in your class design allows your system to evolve without breaking existing code.

Posted to KB Topic: Object Orientation (OO)
10 years ago, and updated 9 years ago

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Wes Peterson
32. Is Native Code Irrelevant?

With Microsoft heavily evangelizing .NET, and Sun continuing to improve Java, many a developer and customer are torn between targeting native machine code or a just-in-time compiler.

Here we take a quick look at that particular state of the union...

Posted to KB Topic: General Coding Concepts
9 years ago, and updated 9 years ago

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33. Member Event

A custom event added by a programmer to a class. Custom created events need to be processed, usually by an event dispatcher within a framework.

Posted to KB Topic: Object Orientation (OO)
9 years ago

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34. Member Field

Also known as a Class Field.

A class variable defined with a specific class visibility, usually private visibility. A member property is different than a member field. A member property uses a member field to store values through accessor methods (getters and setters). For example, it is common to use a private member field to store the current value of a property. The current values of all the class member fields is the current state of the object.

Posted to KB Topic: Object Orientation (OO)
10 years ago, and updated 9 years ago

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35. Member Method

Also known as a Class Method.

A code routine that belongs to the class or an object instance (an instance of the class). Methods that belong to the class are called class methods or static methods. Methods that belong to an object instance are called instance methods, or simply methods.

When a method returns a value, it is a function method. When no value is returned (or void), it is a procedure method.

Methods frequently use method parameters to transfer data. When one object instance calls another object instance using a method with parameters, you call that messaging.

Posted to KB Topic: Object Orientation (OO)
9 years ago, and updated 9 years ago
(1 Comments , last by Andrew.S2 )

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36. Method Overriding

Where you define or implement a virtual method in a parent class and then replace it in a descendant class.

When you decide to declare a method as virtual, you are giving permission to derived classes to extend and override the method with their own implementation. You can have the extended method call the parent method's code too.

In most OO languages you can also choose to hide a parent method. When you introduce a new implementation of the same named method with the same signature without overriding, you are hiding the parent method.

Posted to KB Topic: Object Orientation (OO)
9 years ago

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Daniel Fought
37. Namespace A means of organizing .NET code.
Posted to KB Topic: General .Net Concepts
10 years ago
(1 Comments , last by margaretr.m )

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39. Overloading

Types of overloading include method overloading and operator overloading.

Method Overloading is where different functions with the same name are invoked based on the data types of the parameters passed or the number of parameters. Method overloading is a type of polymorphism and is also known as Parametric Polymorphism.

Operater Overloading allows an operator to behave differently based on the types of values used. For example, in some languages the + operator is used both to add numbers and to concatenate strings. Custom operator overloading is sometimes referred to as ad-hoc polymorphism.

Posted to KB Topic: General Coding Concepts
10 years ago, and updated 9 years ago

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40. Partial Class

A partial class, or partial type, is a class that can be split into two or more source code files and/or two or more locations within the same source file. Each partial class is known as a class part or just a part. Logically, partial classes do not make any difference to the compiler. The compiler puts the class together at compile time and treats the final class or type as a single entity exactly the same as if all the source code was in a single location.

Posted to KB Topic: Object Orientation (OO)
9 years ago, and updated 9 years ago

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41. Pointers / References

A pointer is a variable type that allows you to refer indirectly to another object. Instead of holding data, a pointer holds the address to data -- the address of another variable or object. You can change the address value a pointer points to thus changing the variable or object the pointer is pointing to.

A reference is a type of pointer that cannot change and it must always point to a valid storage (no nulls).

Posted to KB Topic: General Coding Concepts
9 years ago

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42. Polymorphism

A coding technique where the same named function, operator, or object behaves differently depending on outside input or influences. Usually implemented as parameter overloading where the same named function is overloaded with other versions that are called either with a different type or number of parameters. Polymorphism is a general coding technique and other specific implementations are common such as inheritance, operator overloading, and interfaces.

Posted to KB Topic: Object Orientation (OO)
15 years ago, and updated 9 years ago

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Wes Peterson
43. PowerCommands for Visual Studio 2008 http://www.visualstudiogallery.com/ExtensionDetails.aspx?ExtensionID=df3f0c30-3d37-4e06-9ef8-3bff3508be31
Posted to KB Topic: General .Net Concepts
10 years ago

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44. Programming Literals

A value directly written into the source code of a computer program (as opposed to an identifier like a variable or constant). Literals cannot be changed. Common types of literals include string literals, floating point literals, integer literals, and hexidemal literals. Literal strings are usually either quoted (") or use an apostrophe (') which is often referred to as a single quote. Sometimes quotes are inaccurately referred to as double quotes.

Posted to KB Topic: General Coding Concepts
9 years ago
(1 Comments , last by Suzy.W )

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45. RAD Studio 2010 Tour! See Delphi 2010!

Embarcadero TechnologiesSee What's New in RAD Studio 2010 at a Free Seminar
COMING TO A CITY NEAR YOU!

Technology is moving fast. Learn the secrets to getting the most out of RAD Studio 2010 and new Windows technologies by attending the RAD Studio 2010 Tour in a city near you. These free two-hour technical seminars, led by noted experts David Intersimone, Anders Ohlsson, Nick Hodges, or Mike Rozlog, will give you a firsthand look at new capabilities that will make you more productive and successful with Delphi--, C++Builder--, Delphi Prism-- and Embarcadero-- RAD Studio 2010.

Touch the future with Delphi, C++Builder, and Delphi Prism!

9 years ago

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46. Regex Console application shows some common uses of Regular Expressions (REGEX) to match and recursively replace text in strings.
Posted to KB Topic: General .Net Concepts
10 years ago, and updated 10 years ago

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47. Round Floating Point Numbers

When comparing floating point numbers, make sure you round to an acceptable level of rounding for the type of application you are using.

Posted to KB Topic: General Coding Concepts
9 years ago

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48. Sacramento Visual Studio.Net Usergroup http://www.sacnetug.org/
Posted to KB Topic: General .Net Concepts
10 years ago, and updated 8 years ago
(2 Comments , last by mprestwood )

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49. Send Email Using C#

This code snippet will send a very quick email. Note that this code will not work as-is. You need to have valid email accounts and a valid email server to send a real email.

You need to add: using System.Net.Mail;

Posted to KB Topic: General .Net Concepts
10 years ago, and updated 10 years ago

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50. Stack A queue-like data structure which supports the last in, first out functionality.
Posted to KB Topic: General Coding Concepts
10 years ago

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51. Static Class / Static Member

A static member is a member you can have access to without instantiating the class into an object. For example, you can read and write static properties and call static methods without ever creating the class. Static members are also called class members (class methods, class properties, etc.) since they belong to the class and not to a specific object. A static class is a class that contains only static members. In the UML, these classes are described as utility classes.

Posted to KB Topic: Object Orientation (OO)
10 years ago, and updated 9 years ago
(1 Comments , last by Anonymous )

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52. Storing your .NET Application Settings Storing settings and configuration information for your .NET application can be achieved in a number of ways including using the app.config file and the ConfigurationManager class, using the registry, and in your own custom configuration file.
Posted to KB Topic: General .Net Concepts
10 years ago, and updated 10 years ago
(3 Comments , last by kroy )

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53. Unary Operator

An operation with only one operand (a single input). Common unary operators include + plus, - minus, and bitwise not. Some operators can function as both unary and binary operators. For example, + and - operators can serve as either.

Posted to KB Topic: General Coding Concepts
10 years ago, and updated 9 years ago

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54. Uninstalling the BDE

It's rare, but sometimes it may be necessary to remove the BDE from a machine. Not for the faint of heart, and with serious possible consequences, we explain how to manually uninstall the BDE. This is intended for developers or power users.

Posted to KB Topic: Borland Database Engine
10 years ago, and updated 9 years ago

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55. Web, Desktop, or Hybrid: Which is the best choice?

The web has "grown up" to the point that many people now feel that it is THE way to deploy virtually everything. However, it is still primarily a document-based interface. Others believe that desktop applications are superior because they can utilize all the power of an operating system. This needn't be a debate because understanding the advantages and disadvantages of each can make it quite simple to identify the ideal deployment technology. There is also "a third way": utilize a web service to serve up data for your desktop application.

10 years ago, and updated 9 years ago

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56. Which Development Tool would YOU use?

Maybe I'm cynical, but as a developer meeting with a prospective client to gather requirements, I always wait for that one "gotcha" that turns a simple, straightforward project into a potential daymare. 

8 years ago, and updated 8 years ago
(2 Comments , last by lowster11 )

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