ch01-introduction to vb

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rwin/McGraw-Hill rwin/McGraw-Hill Copyright© 2000 by the McGraw-Hill Comp

PowerPoint® PresentationPowerPoint® Presentationto accompany

prepared byJames T. Perry

University of San Diego


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2Copyright© 2000 by the McGraw-Hill CompIrwin/McGraw-Hill

Ch. 1: Introduction to VBCh. 1: Introduction to VB

Writing windows applications with V

Prog. lang!ages" proced!ral# ob$ect

oriented# % event drivenWriting V pro$ects

The V environment

Writing yo!r first V pro$ect&inding % fi'ing errors

Vis!al asic help


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Writing Windows Apps. withWriting Windows Apps. with

VBVBThe Windows )U*

Te't bo'es

&rame

+abels

,ption b!ttons

-hec bo'es

-ommand b!ttons

*mage

Pict!re bo'


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Graphic User InterfaceGraphic User Interface

)raphic User *nterface 0)U*1 comprises

&orms

-ontrols

3vent4driven programming


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Prog. Languages: procedura!Prog. Languages: procedura!

o"#ect oriented! $ e%ent dri%eno"#ect oriented! $ e%ent dri%enThe ,b$ect 6odel ,b$ects 0no!ns1 controls

Properties 0ad$ectives1 form7.-aption

6ethods 0verbs1 deb!g.print

Versions of Vis!al asic

Woring 6odel +earning 3dition

Professional 3dition

3nterprise 3dition


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Panning Visua Basic Pro#ectsPanning Visua Basic Pro#ectsThe three4step process for planning pro$ects Design the !ser interface

Setch the screens with forms and controls needed

3stablish the ob$ects9 properties

Write down the properties for each ob$ect

Plan the asic code

Write o!t pse!docode for actions yo!r program will

perform


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Writing Visua Basic Pro#ectsWriting Visua Basic Pro#ectsThe three4step process for writing pro$ects Design the !ser interface

-reate the forms and controls yo! previo!sly setched

Set the ob$ects9 properties

)ive each ob$ect a name and set their properties

Write the asic code

Write o!t Vis!al asic code to carry o!t yo!r

application9s actions


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Visua Basic Pro#ectsVisua Basic Pro#ects

Vis!al asic pro$ects create several files Pro$ect file" .VP

S 0optional1

-!stom controls" .,-? 0optional1

&orm information" .VW


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&he Visua Basic 'n%iron(ent&he Visua Basic 'n%iron(ent&orm# Pro$ect 3'plorer# Properties# and

&orm +ayo!t Windows

Toolbo'

6ain Vis!al asic window

Toolbar# &orm location % siAe information


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&he &oo"o)&he &oo"o)

Tool bo' contents vary based on which

version of Vis!al asic yo! are r!nning.

Toolbo' contains a common set of tools

across all V versions


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&he Visua Basic &oo"ar &he Visua Basic &oo"ar

The b!ttons on the toolbar are shortc!ts

Toolbar b!ttons are a C!ic way to activate

freC!ently !sed commands

3ach b!tton stands for a command that yo!

can also select a the Vis!al asic men!


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Writing *our +irst VB Pro#ectWriting *our +irst VB Pro#ectSet !p yo!r Vis!al asic worspace

Define !ser interface

Set propertiesWrite code

Vis!al asic code statements

=!n# save# open# modify# % print the


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,et Up *our VB Wor-space,et Up *our VB Wor-space

Set !p ,ptions to reflect these settings"


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efine the User Interfaceefine the User Interface

=esiAe the form

Drag the lower4right handle to enlarge the form

Drag any handle in the middle of a side to

enlarge the form in that direction only

Place controls on the form

-lic the label tool

-lic and drag the mo!se 0a crosshair1 to place

the control on the form


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,et Properties,et Properties

Set the ame and -aption properties >lways set the ame property before writing

code e't# set the -aption property

The ame property identifies the ob$ect

internally44so yo! can refer to it in code

The -aption property e'ternally idenfities

an ob$ect


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Write CodeWrite Code

Eo! write code enclosed in event procedures# which respond to typical V

events.Private Sub cmdPush_Click()

. . . (your code goes here)

End Sub

V a!tomatically s!pplies the event proced!re S!bF3nd S!b statements


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Visua Basic Code ,tate(entsVisua Basic Code ,tate(ents

=emar statement is any code line

beginning with an apostrophe

>ssignment statement

3nd statement


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Code the '%ent ProceduresCode the '%ent Procedures

for /eo Wordfor /eo WordWrite the P!sh event code for the P!sh 6e

b!tton 0cmdP!sh1

Write the P!sh event code for the 3'it

b!tton 0cmd3'it1


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0un,a%e2pen3odif4 the0un,a%e2pen3odif4 the

Pro#ectPro#ectTest the pro$ect" -lic =!n# Start

0or clic the Start b!tton on the toolbar1

-lic the P!sh 6e b!tton -lic the 3'it b!tton

Save the pro$ect and the form

6ae modifications to the formPrint the pro$ect doc!mentation"

&orm *mage# -ode# and &orm as Te't


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+inding $ fi)ing errors+inding $ fi)ing errors-ompile 0synta'1 errors

=!n4Time 0semantic1 errors

+ogic errors

Pro$ect Deb!gging


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5a(ing Con%entions5a(ing Con%entions,b$ects have special prefi'es that help

identify the ob$ect9s general type

Programmers follow the conventions

beca!se it simplifies coding and deb!gging

ever !se defa!lt names for ob$ects

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