Visual Basic 6.0 Set 3

Front 1

Collections have four methods what are they?

Back 1

1) Add
2) Count
3) Item
4) Remove

Front 2

What are the possible instancing properties for active x.

Back 2

Private
PublicNotCreatable
SingleUse
GlobalSingleUse
MultiUse

Front 3

When using variables of these types, you may need to take different actions based on the class of an object for example, some objects may not support a particular property or method. Visual Basic provides two ways to do this: what are they?

Back 3

TypeOf keyword
typeName function

Front 4

With collections you can return a value how?

Back 4

With the item method either by index or key.

Front 5

They contain bitmaps, text strings, and other data that you can change without having to re-edit your code. For example, if you plan to localize your application in a foreign language, you can keep all of the user-interface text strings and bitmaps in a here, which you can then localize instead of the entire application.

Back 5

Recource Files

Front 6

Why are ActiveX EXEs sometimes useful?

Back 6

Because they can run on a different computer than the main program while an ActiveX DLL must run on the same computer as the main program

Front 7

The TypeOf keyword can only be used where?

Back 7

If ... Then ... Else statements. You must include the class name directly in your code. For example, If TypeOf MyControl Is CheckBox Then.

Front 8

What is the purpose of a Property Let procedure?

Back 8

It is used to allow users to assign a new value to the property.

Front 9

Descriptions of classes are stored in type libraries, and can be viewed with what?

Back 9

object browser

Front 10

Visual Basic provides two mechanisms for enhancing components without affecting compiled applications what are they?

Back 10

version compatibility for interfaces, and multiple interface

Front 11

What does the TypeName function return?

Back 11

It returns the class name as a string.

Front 12

What are the instancing properties that can only be used for and ActiveX EXE?

Back 12

SingleUse
GlobalSingleUse

Front 13

The ActiveX rule you must follow to ensure compatibility with multiple interfaces is what?

Back 13

Once an interface is in use, it can never be changed.

Front 14

A ____ is a way of grouping a set of related items.

Back 14

collection

Front 15

An application or component that uses objects provided by another component is called a __?

Back 15

A client.

Front 16

Collections have 4 methods. What are they?

Back 16

Add
Count
Item
Remove

Front 17

What is instancing when refering to Active X?

Back 17

It determines how the object can be created.

Front 18

What are the possible values of and instancing property for a activeX componet?

Back 18

Private
PublicNotCreatable
MultiUse
GlobalMultiUse
SingleUse
GlobalSingleUse

Front 19

Components are characterized by what?

Back 19

Their location relative to clients.

Front 20

Class modules have two built-in events what are they?

Back 20

Initialize and Terminate.

Front 21

In active x if you set the instancing property to SingleUse what does this mean?

Back 21

The main program can create the object. Every time you create a new object, the system makes a new ActiveX EXE instance to service the object you created. Among other things, if the EXE contains global variables then different objects you create get different copies of the variables. This option is allowed for ActiveX EXEs only.

Front 22

A Collection object stores each item in a ___?

Back 22

Variant

Front 23

An out-of-process component is what?

Back 23

An .exe file that runs in its own process, with its own thread of execution. Communication between a client and an out-of-process component is therefore called cross-process or out-of-process communication.

Front 24

A collection is either __ or ___, depending on what its starting index is.

Back 24

zero-based
one-based

Front 25

Where does a in-process component run?

Back 25

It runs in the same process as the client.

Front 26

What are circular references?

Back 26

It occurs when two objects hold references to each other or when an object holds a reference to itself.

Front 27

In active x if you set the instancing property to MultiUse what does this mean?

Back 27

The main program can create the object. When it does, the system makes an ActiveX DLL/EXE component to handle the object. If you make other objects, the system uses the same ActiveX DLL/EXE component to handle them. This can be a little confusing depending on whether you are building a DLL or EXE and whether an EXE is running on different computers.

Front 28

In active x if you set the instancing property to private what does this mean?

Back 28

Code outside the DLL/EXE cannot create this object type. Other classes in the DLL/EXE can use this type of class as a helper but the main program cannot use it

Front 29

In active x if you set the instancing property to GlobalSingleUse what does this mean?

Back 29

Similar to SingleUse except you can invoke the properties and methods of the class as if they were simple global functions. This option is allowed for ActiveX EXEs only.

Front 30

In active x if you set the instancing property to In active x if you set the instancing property to PublicNotCreatable what does this mean?

Back 30

The main program can use this type of class but cannot create new instances using the New keyword or with CreateObject. In this case, you need to provide some method within the other classes to create the new object and return it to the main program.

Front 31

How are ActiveX DLL's and Active X EXE simular.

Back 31

They are almost exactly the same in the ways they are built and used. In both cases, you build one or more classes that applications can use to do something.

Front 32

An ActiveX EXE's code is run where?

Back 32

It is run in a separate process.

Front 33

An ActiveX DLL's code is executed where?

Back 33

Within the main program's address space.