meljun cortes visual basic control arrays

8/13/2019 MELJUN CORTES Visual Basic Control Arrays

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CONTROL ARRAYS

MELJUN CORTES


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Overview

Definition of Control Arrays

Characteristics of Control Arrays

Uses of Control Arrays

How to create Control Arrays

Example / Demonstration


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is a group of controls of the same typethat have thesame nameand share the same set of event procedureor provide similar functionality.



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each control array element maintains its ownproperties

share its event procedure code with the other controlarray elements

have minimum lower boundof 0 and a maximum upperbound32767

control array bounds are not affected by Option Base(unless the programmer specifies otherwise, 0 isalways the lower bound

each control array element is uniquely identified by itsInteger Index property


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to group together existing controls

fewer resources than simply adding multiple controls ofthe same type to a form at design time.

useful if you want several controls to share code

Example: if three option buttons are created as a controlarray, the same code is executed regardless of whichbutton was clicked


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How to create Control Arrays?

By giving a control the same name as another control

By copying a forms control and pasting the copy onthe form

Explicitly setting a controls Indexproperty


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Control Array Dialog Box


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Example

A government lab wants to install a security keypad outside a laboratory

room. Only authorized personnel may enter the lab, using their securitycodes. The following are valid security codes:

16451689 = Technician Personnel

8345 = Custodial Services

55875 = Special Services

999898, 10000061000008 = Scientific Personnel

As an added security measure, the keypad treats any access less than1000 as a panic code by sounding a single beep. Although access is

denied, security is notified immediately. Once an access code isentered, access is either granted or denied. All access attempts arewritten to a window below the keypad. If access is granted, the date,time, and group (i.e., Technician Personnel, Custodial Services, etc.)are written to the window. If access is denied, the date, time and themessage Access Denied are written to the window.


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Example: Explained

True

True

True


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Example: Sample GUI


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Example: Explained (Case Multiple Selection Structure)


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Example: Explained (Control Arrays)


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Review




How to create Control Arrays

meljun cortes visual basic control arrays

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