Visual Basic 6.0 Set 2

Front 1

What is ActiveX?

Back 1

Microsoft's specification for reusable software components. ActiveX is based on COM, the Component Object Model. The basic idea is to define exactly how software components interact and interoperate so developers can create components that work together using the definition.

Front 2

A developer designing a application against a interface can avoid what problem?

Back 2

Creating dependencies on class definitions.

Front 3

What does COM use to make sure componets don't clash?

Back 3

A ID called a GUID, or Globally Unique IDentifier and they're calculated by compilers and other development software using a special algorithm.

Front 4

What is the file OLE32.dll?

Back 4

It is the main DLL that exposes COM's core library of functions.

Front 5

What where Active X componets originally called?

Back 5

OLE Servers

Front 6

If your server programs needs to communicate on other machines (possible different OS's) you must use what?

Back 6

Active X EXE

Front 7

What does the word register mean in relation to a DLL?

Back 7

It means the system knows how to find it when an application creates an object using the DLL's ProgID. When a DLL is compiled, Visual Basic automatically registers it on that machine for you. COM depends on the Windows registry and requires all COM components to store or 'register') information about themselves in the registry before they can be used. A unique ID is used for different components to make certain they don't clash.

Front 8

Each coClass has a GUID called what?

Back 8

class id (CLSID)

Front 9

What is a Automation controller?

Back 9

It is a standard way to make a software object available through a defined set of interfaces. This is a great idea because the object is available to any language that follows the standard methods. The standard used in Microsoft (and therefore VB) architecture is called OLE automation. It allows an application to use the objects belonging to another application.

Front 10

Interfaces promote what Object Oriented principle?

Back 10

Polymorphism

Front 11

What is a process?

Back 11

It refers to a program that is currently executing, or "running" on a computer.

Front 12

What is the Microsoft Message Queue (MSMQ) used for?

Back 12

It is a middleware product that enables asynchronous communications between applications. The client can send messages to the server even if it is not running.

Front 13

This OO principle allows a client to treat different objects in the same way, even if they where created from different classes and exibit different behaviors.

Back 13

Polymorphism

Front 14

How are COM coclasses and interfaces indentified?

Back 14

By a 128-bit integer called globally unique identifer(GUID)

Front 15

When setting up and interface using a ActiveX EXE or ActiveX DLL you set the instancing property to what?

Back 15

PublicNotCreatable

Front 16

What is another term used in place of GUID?

Back 16

Universally Unique Identifiers
(UUID)

Front 17

In order to be useful a interface must do what?

Back 17

Must be implemented by one or more classes.

Front 18

Each COM interface has a GUID called what?

Back 18

An interface id (IID)

Front 19

Interface-based programming is based on a form of inheritance known as what?

Back 19

interface inheritance

Front 20

What is IIS Application?

Back 20

A new enhancement to Visual Basic 6.0 added to the IDE which makes it easy for web programmers to write there application in Visual Basic Code rather then VB Script or Java Script in a ASP application.

Front 21

What does MSMQ stand for?

Back 21

Microsoft Message Queue

Front 22

How would you check if a object dog implements a IWonderDog interface?

Back 22

Use typeof
If TypeOf Dog is IWonderDog then .....

Front 23

Interface-based programming was was pioneered in what lanuages?

Back 23

C++ and Smalltalk

Front 24

Before COM how where applications built?

Back 24

They where built by sending hundreds or possible thousands of source files together to a compiler in a single batch job to build when executable file.

Front 25

When using a ActiveX EXE how do you load a form?

Back 25

You MUST add a standard module with a Sub Main and have the Sub Main load the form.

Front 26

The COM libary supplies what to create GUID's?

Back 26

A function called CoCreateID

Front 27

What are three characteristics of good long lasting software?

Back 27

1)reusability
2)maintainability
3)extensibility

Front 28

What is XML?

Back 28

It allows designers to create their own customized 'markup tags' for information. This makes it possible to define, transmit, validate, and interpret information between applications with greater flexibility and accuracy.

Front 29

COM's distributed characteristics are based on what?

Back 29

Remote Procedure Call (RPC)

Front 30

What is the term for a distinct data type that defines a set of public methods without including implementation?

Back 30

Interface

Front 31

What is the main DLL that exposes COM's core library of functions called?

Back 31

OLE32.dll

Front 32

If your business rules keep changing a class will need to change as well. This creates the need for what?

Back 32

entensible objects

Front 33

If your program on the server does nothing but serve set it up as what?

Back 33

Active X DLL

Front 34

Programming with COM is the same if you are building an in-process server or a out-of-process server. This feature is known as what?

Back 34

location transparency

Front 35

How can programmers access MSMQ?

Back 35

Through a series of COM interfaces.

Front 36

What is marshaling?

Back 36

The communication sytem to send ActiveX EXE Data between programs and machines.

Front 37

If your program is used mainly for another task but can be used in your application set it up as what?

Back 37

Active X EXE

Front 38

You can achieve the benefits of interface based programming by following three steps what are they?

Back 38

1) Define a interface
2) Implement the interface in one or more created classes
3)Use a interface reference in a client to communicate with objects.

Front 39

What is the term used when refering to the remoting facilities of COM?

Back 39

Distributed COM or DCOM.

Front 40

A object exposes its methods and properties through what?

Back 40

Its public interface

Front 41

The concept in COM that formalizes the separation of interface from inplementation is known as what?

Back 41

interfaced-based-programming

Front 42

What part of OOP is not available with COM?

Back 42

implemenation inheritance