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GettingStarted

programwillmakeamessageboxthatsays"HELLO!".Goodprogrammingstylesgenerally

usecmd<ButtonName>whennamingabutton.

3.4.3 Textboxes

Textboxesallowstheuserstoaddtextareastotheirprograms. Thistextdoesnothaveto

betypedindirectlybytheprogrammer,butcouldcomefromothersourcessuchasdatabase

ﬁelds,textﬁlesordatatheuserwilltypeinwhiletheprogramisrunning. Althoughthe

defaultvalueforthisisthenameofthecontrol,itcanbesettoanythingincluding""(or

nothing). Textboxnamesarepreﬁxedwithtxt,eg;txt<BoxName>.

3.4.4 Labels

Labels areoneofthemostusedVisualBasicobjects. . Theyareoftenusedtolabelother

controls(textboxes,images,etc.) orprovidefeedbacktotheuser. . Theyareusuallynamed

likelbl<LabelName>.

3.4.5 Timers

Timers areinterestingand d easy y to learn. Ifyouwant t theprogram m to performacertain

taskafteracertainamountoftime,theTimeristheretohelpyouout. Theironlyevent

procedureis _timer,whichwillbeexecutedeverytimeafteracertainamountoftimeis

passed. ThemostcommonstepstouseTimersisassimpleasfollows:

1. Addatimertotheformandgiveitaname.

2. SetthetimeintervalinthePropertieswindowtosomevalueabove0.

3. Doubleclickthetimerandaddthecodeyouwantexecutedatthesetintervals.

Timershaveveryfewpropertiestoo.

Thisisapossibleuseoftimer:(ToseeitinactionaddaCommandbutton,Shapecontrol,

and Timer r to a a new form. Then n set t the Timer.Interval property using g the e Properties

window.Copythecodebelowintotheform'scodemoduleandpressF5toruntheprogram.)

Private Sub Command1_Click()

Timer1.Enabled = Not Timer1.Enabled

End Sub

Private Sub Timer1_Timer()

Shape1.Visible = Not Shape1.Visible

End Sub

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Controls

Thiswouldmake the commandbuttonstopandstarttheﬂashing(repeatedlydisappear

andreappear)oftheShapecontrol.TheﬂashintervalisdeterminedbytheTimer'sInterval

property. Timer.Intervalismeasuredinmilliseconds.

Hereisanothertimerexampleofacounter:

'***************************************************************** *

'APRON TUTORIAL PRESENTED BY MORROWLAND *

'***************************************************************** *

'Project Name : Timer * * Project Description : Using Timer and

'Counter * * * Project t Type : Visual Basic * * Author : Ronny André

'Reierstad * * * * Web Page : www.morrowland.com * * E-Mail :

'apron@morrowland.com * * Version : English h (UK) ) * * * * Date e :

'27.06.2002 *

'*****************************************************************

'Timers are the backbone e in n any y good d application, you will be able

'to decide when things will happen in millisecounds by using timers

'and counters you gain control

'declare counter as s integer

Dim counter r As Integer

Private Sub Form_Load()

Timer1.Enabled = False 'disable timer at startup

End Sub

Private Sub Command1_Click()

Timer1.Enabled = True

'starts the timer by enabling g it

End Sub

Private Sub Command2_Click()

Timer1.Enabled = False 'stops s the e timer r by disabling g it

End Sub

Private Sub Command3_Click()

counter = 0

'reset the e counter

End Sub

'The timer procedure

'the timer procedure will loop in the interval of the timer

'I have set the timer interval in the "properties" " menu u to 1000 ms (1 1 sec)

Private Sub Timer1_Timer()

counter = counter + 1

'we set t the counter to o count t here

Text1.Text = counter

'write the e counter r value out as text

End Sub

VBTimersaregivenlowpriorityontheprocessingtotempole. Ifanyothercodeneedsto

executewhenthetimedintervalhaselapsed,thatothercodeisallowedtoexecutebefore

the timer's s procedure e is s called. Other r code can n yield some of f their r processing g time to

WindowsbyusingtheDoEventscommand. ThatistheonlyVBcommandthatwillallow

code you writetoyieldtimetoany pendingtimer events intheprogram. Withoutthe

useofDoEvents,eachsubroutineorfunctionis executedstarttoﬁnish,inserial

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GettingStarted

fashion.Inotherwords,onlyonecommandorstatementcanbeexecutedatatime.Each

subroutineorfunctionmustlistthepropercommandstoexecute,intheirproperorder.

3.4.6 Pictureboxes

Althoughcalledpicture boxes,theseobjects arenotjust aheavyweight versionof image

boxes: pictureboxesalmosthavethesamepropertiesandfunctionasFormobjects. Itcan

dofarmorethanjustdisplayingpictures. Probablythebestwaytodescribepictureboxes

isthattheyarecontainersthatcangroupotherobjectstogether,kindofsimilartoframe

objects. E.g.severalcommandbuttonscanbedrawn"inside"ofit.

Seealso../SimpleGraphics/

3.4.7 Generalproperties

VBextends somecommonproperties toallcontrols placedonaform. Name,Top,Left,

andTag,areafewoftheextendedpropertynames. Whenyoulassoandhighlightseveral

controlsonaform,youcanchangethegeneralpropertyvaluesofallthehighlightedcontrols

usingthePropertieswindow. Makingachangetherewillchangethepropertyofthesame

nameforallofthehighlightedcontrols.

3.4.8 References

ReferenceisakindoflinkthatisusedbyVisualBasic. Thewordreferenceisusedintwo

distinctways:

Componentreference

Are typically y external l libraries such as DLLs

, OCXs

, or r type library

. Component

referencesareaddedtotheproject,sothatallpartsoftheprogrammayinteractwiththe

outsidecomponent.

Objectreference

Istypically apointer toaninternalobject

. Object t references diﬀerentiate,or identify,

speciﬁcobjectswithintheprogram.Thetermobjectisaverygeneraltermusedtoindicate

justaboutanythingthat haspropertiestoset,or methodstocall. For r example,ifyour

formhas5textboxesonitandyouwanttoputtextinjustoneofthem,youneedtouse

theproper'objectreference'toaddressthatspeciﬁctextbox.

Thesetwousesarequitedistinctandgenerallydonotcauseanyproblems. Usuallywhen

objectreferenceismeantitwillbewrittenoutinfullwhereasjustreferencesusuallymeans

referencestoanexternallibrary. Inbothcases,accessingtheproperties(ormethods)ofa

Chapter17onpage91

http://en.wikibooks.org/wiki/..%2FDLL

http://en.wikibooks.org/wiki/..%2FOCX

http://en.wikibooks.org/wiki/..%2Ftypelib

http://en.wikibooks.org/wiki/..%2Fobjects

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ReservedWords

componentorobjectreferencerequiresaspecialsyntaxthatincludesaperiodtoseparate

theobject andproperty. The e syntaxis: : .<property>or,byexample: Form1.Caption=

"This",orText1.Text="That",etc. whereForm1orText1arethespeciﬁcobjectsyou

wanttoalter,andCaptionorTextarethespecﬁcpropertiesbeingchanged.

Youcancreatecomponents

inVBtobeusedbyotherprograms(notjustthosewrittenin

VB).

3.5 ReservedWords

Visual Basic contains severalreservedwords. These e words are "reserved" because they

arespeciﬁcfunctionsandcommandsinVisualBasic. Forexample,avariablemaynotbe

named"Print" because itis a feature inVBtoprint. This s canbe avoidedhowever,by

naming your variables"prnt"or"print1". Aslongasitis s nottheexact word,itshould

work.Alistoffrequentlyusedreservedwords/keywords:

And

Beep

Call

Command

Date

End

Error

Event

Exit

False

For

Function

Get

GoTo

Input

Kill

Let

Load

Loop

Name

Not

Nothing

Option

Private

Public

Put

Reset

Resume

Set

Step

Chapter3.3.2onpage13

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GettingStarted

Stop

Sub

Then

Time

True

Until

While

With

3.6 REMs

While programmingyoumay ﬁnditnecessary to leave yourself notes. This s canbeused

toeasilyidentifyareasofcode,orasareminderofsectionsofcodewithlogicerrorsthat

needtobeﬁxed. REMsareverysimple. Merelyplaceanapostrophe,"'",ortheword,

"REM",beforethe lineandthat linewillbe ignoredby the interpreter,whetherit bea

messagetoyourselforasectionofcode. Forexample:

' I leave e notes s to myself

REM or I could do it like this

'If I REM M a a line e of f code it will not execute!

REM x=5

Anapostropheismost oftenusedduetothecomparativereductioninspaceandtimeas

REMhasbeenincludedsoastobebackwardcompatiblewithearlierversions ofBASIC.

The REM statement is s abasic c commandandmust be preceded by a colonif following

othercommandsonthesameline. Anapostropheneedsnocolon:

x = 5 'This comment will work

y = 3: REM and this comment will work.

z = 1 REM M This s line would cause a syntax x error.

3.7 ErrorChecking

TheseareseveralcommontypesoferrorsthatonemightgetfromaVBprogram:

run-timeerrors

This type of error are errors that are raised d whenthe program is s running. Examples:

dividinganythingbyzeroorassigningastringtoanumericvariable.

compile errors

CompileerrorsareerrorsthattheIDEspotsatdesign-timeanduponcompilingthepro-

gram just t before it runs s the program. These e errors s include syntax x errors s -- the e error

raisedwhenthecomputerdoesnotunderstandyourcode,andalsoerrorslikeundeclared

variablesetc.

logicerrors

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ErrorChecking

Logicerrorsareerrorsthatthecomputercannotspot. Theseareerrorsthat,eventhough

theprogramruns,theresultisnotwhatyouintended.

Theﬁrsttwooftheseerrorsaregenerallyeasytospot,andthedebuggingtoolcanbeused

tohigh-lighttheline oftextatwhichtheerroroccurred. For r example,ifyouwantedto

makeaprogramtoconvertCelsiustoFahrenheit,andinthecodeyouusedamultiplication

symbolinsteadofdivision,theprogramwouldrunﬁne,buttheprogramwouldnotconvert

thetemperaturescorrectly,asyoudesired. Althoughsometimes s theselogicerrorscanbe

easy tospot,somearequite diﬃcult. Logicerrorsbecomeconcealedinthelinesofcode

whenmakingcomplexprograms,suchasagame. Justremember,thecomputerdoes s not

knowwhattheprogramissupposedtodo,itonlyknowsthecode. Lookthroughthecode

step-by-stepandthinkofhowthecomputerwouldinterpretthecode.

VBwon'tletyoujustignoresyntax/compileerrors. Youhavetoﬁxthembeforeyoucan

runyourprogram. Butrun-timeerrors,whicharesyntacticallycorrect,butmaycausean

errorifanattemptismadetoexecuteit,canbehandledtopossiblypreventyourprogram

fromcrashing.Thefollowingexampleshowsaverygoodwayofhandlingapossibleerror:

Private Sub Form_Load()

On Error r GoTo ErrorHappened

i = = 1 / 0 'This line e will l cause an n error r to be e raised as s anything g divided

by zero = infinity

'...

'Some code

Exit Sub b 'Here e the subroutine is exited d if f no errors occur

ErrorHappened:

'Informs the e user an n error r happened.

MsgBox "Error Number r " " & Err.Number & ":" & Err.Description

End Sub

The output ofthis example is amessage box that says "Error Number 11: Divisionby

zero". ThestatementOnErrorGotoErrorHappenedwillskipeverythingfromi i = = 1 1 / / 0

toExit Subifanyrun-timeerroroccurswithinthisprocedure.Whenanerrorisdetected

theprogramwillcontinuetorunfromrightafterErrorHappened:,wheretheerrorwillbe

displayedsothattheprogrammercanﬁndoutwhatitisandﬁxit.Thisalsopreventsthe

programfrom"crashing".

ErrorHappened is s just t a line label, , you u canname it t anythingyou u wish to identify y that

sectionof the procedure e you u want to o execute when n an error happens. On n Error r Goto

canonlyreferenceline labelsthat arewithinthecurrent procedure. Youcannot(easily)

deﬁneoneerrorhandlerforallprocedures. ExitSubmeanstoendtheForm_Loadevent

immediately.

Soifnoerroroccurs,amessageboxwillNOTbecalledbecauseExitSubwillalreadyhave

endedorexitedoursubroutine. Andifanerrordoesoccur,themessageboxwillpopup,

displayingtheErrorNumberandtheErrorDescription.

Theaboveexampleisthesafestwayofdetectingandhandlinganyerrorthattakesplacein

thesubroutine. Howeveryoucanalsochoosetoignoreerrorsbyusing"OnErrorResume

Next"whichmeanstoignoreallerrors.Ignoringerrorsisnotagoodideainmostscenarios,

butinsomecasestheproperwaytohandleanerroristodonothing,sotheymightaswell

beignored. EvenusingResumeNext,youcantesttheErrobject(Err.Number)toseeif

anerrorhappenedonprecedinglines.

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GettingStarted

SeeErrors

formoredetailabouterrorhandling.

3.8 DeclaringVariables(Dimensioning)

If youdon'talready know,avariableis, by dictionary deﬁnition: : a a symbol(like x ory)

that is s used inmathematicalor r logical l expressions s to represent a variable quantity. In

mathematics, commonvariables s are: x,y, , z, etc., and they y can"hold"values likex=1,

y=3,etc. InVB,insteadofx,yandz,avariablecanhavewhatevernameyouwant. It

isoftengoodpractice,andsometimesnecessary,todimensionvariables. Oftenitiscalled

'dimming'.Thisprocessgivesthevariableitsnameandthetypeofvalueitwillbeableto

hold(whichwillbediscussedlater).Todimensionavariable,thecodeis:

Dim variablename e [As s Type]

Ofcourse,thevariablenamecouldbewhateveryouwant. Thetypehowever,isdiﬀerent.

Youhaveachoiceofsingle,integer,orstring. Thistellsthecomputerwhattypeofinfor-

mationthevariableholds. "Single"variables s canholdnumberswithdecimal. "Integers"

variablescanholdwholenumbers,while"String"variablesholdstextorasetofcharacters.

If you don't dimavariable, thetype would automaticallybe"Variant", whichcanhold

almostallkindsofinformation. Forexample:

Option Explicit

Dim intNumber As s Integer

intNumber = 31

' This is ok

intNumber = "I didn't"

' Error: type mismatch (intNumber r is s an integer

while "I didn't" " is s a string

)

Dimmingisespeciallyimportantforarraysandmatrices.Foranarray,nexttothevariable

name,youentertherangeofthearray. Forexample:

Dim x(1 to 10) As Integer

Arrayswillbecoveredmoreindepthlater. Matricesaredimensionedalmostexactlylike

arraysare,however,insteadofthehavingonlyonedimension(1to20),matricesmayhave

two: (1to20,1to5),oreventhree. Dimensioningcanalsobeusedtotellthecomputer

thatvariablesarepublic. ThiswillbediscussedlaterintheScopesection.

Note: If f youdon't dimension your r variables, , you u might t end d up with many y unexpected

errors. Itcouldbe e avoidedbyusingtheOptionExplicit statement,whichrequiresevery

variabletobedeﬁned;ifnoteveryvariableusedintheprogramisdeﬁned,VBraisesan

error: "Variableisnotdeﬁned". Toenablethis,youjusthavetotypeOptionExplicitat

theverytopofALLyourcodeinthecurrentmodule.It'saverygoodpracticetodoso.

Chapter25.10.2onpage137

Simpleoutput

3.9 Simpleoutput

Theinteractionbetweentheuserandthecomputerconsistsofboththeinputandoutputof

data.Thecomputerwillnotreceiveyourcommandsifyoudon'thaveamouseorkeyboard

whichareusedtoinputcommands.Andconversely,youwouldn'tknowwhatthecomputer

isdoingatallifthereisnomonitororspeakerwhichareusedtooutputdata. Therefore

outputisimportant.

3.9.1 Messageboxes

One oftheeasiestformofoutput is message box. I'msureyou'veseenalot t of message

boxesinWindows. Thisiswhatthecodeofanormalmessageboxshouldlooklike.

MsgBox("Hello world!")

Tryit. Areyoutiredoftheboring"Helloworld!"?Let'smakeafancierone:

MsgBox("Fatal error: Your r computer r will be shut down in five seconds.",

vbCritical, "System")

Thatwillcreepoutquitealotofpeople.

3.9.2 Printing

Note: Theword"printing"heremeansusingthePrintstatement,it'snotaboutusingthe

printerorprintingﬁles. PrintingisafairlysimplepartofVisualBasic,butalsoessential.

Printing is used d to o output information to the user. It t proves s to o be a valuable trou-

bleshootingtool. Wheneverprinting,youneedanobjecttoprinton,followedbyofcourse,

somethingtoprint. Printingmaybeusedwithvariousobjects,however,themostcommon

in the picture e box. For r the sake of f simplicity, we e are assuming g you u renamed d the pic-

tureboxas"pic".Inthiswikibookthough,printisdonemainlyonpictureboxesandforms:

pic.Print "Hello world!!"

'Prints message on picture box

Print "Hello world!!!"

'Prints message on current form

3.9.3 Spacing

Therearevarious ways to alter howtextis spacedwhenprinting. Themost t commonis

thecomma. Acommawillgotothenextprintzone. Printzonesare15characterslong.

Youcanthinkofitlikepressingthetabkeywhentypingsomethingout. Rememberthat

print zonesareﬁxed,soifyou'vetyped1letter,andthenusedacomma,thenitwillbe

abigspace. Ifyoutype13charactersanduseacomma,itwillnotbealargespace. For

example:

GettingStarted

Private Sub Form_Click()

Me.Print "Hello", , "Next t Zone"

End Sub

Severalnewconceptsareintroducedinthisexample. The"Form_Click"containsablock

ofcodeanditiscalledtorunwhentheuserclicksonthecurrentForm(Form1).'Me'isthe

sameasthecurrentform(Form1). Don'tbeafraidtoexperiment. Nomatterwhatyoudo

inVB,itsalways reversible. Now,thecommaisn'tallthat t versatile. Anotherfeatureis

tab. TabwillmovesomanyspacesfromtheBEGINNINGoftheline. Followedbytabin

parenthesesistheamountofcharactersspaces. Forexample:

Form1.Print "Hello"; Tab(10); "Yay"

ThiswillNOTprint"yay"10spacesaftertheOof"Hello". Ratheritwillprint10spaces

fromthebeginningoftheline. Youmayuseasmanytabsasyouwantinthesameprint

command. Although h tabis useful,sometimes it t is better tospace things in n relation to

whathasalreadybeenprinted. Thisiswherethespacefunctioncomesin. Thesyntaxof

spaceisidenticaltothatoftab. Spacewillmovethenextprintedtextsomanyspacesover

fromitsCURRENTlocation. Forexample:

Pic.print "Hello"; ; Space(10); "Yay"

This will print the ﬁrst Y of f "Yay" 10 0 spaces to the right t of the e O O in "Hello". It t is

importanttonote,ifyouwrite:

Pic.Print "Hello"

Theywillappearonseparatelinesas:

Hello

Thiscanbeeasilydealtwithintheneedofhavingseparateprintstatementsprintonthe

sameline. Youmerelyhavetochangethecodeto:(notethesemicolon)

Pic.Print "Hello";

Pic.Print "Hello"

Thiswillappearas:

HelloHello

Simpleoutput

Ifyouwanttomakeablanklineinbetweenthetwo"hello"'s,thenyoumaysimplyhavea

blankprintstatementWITHOUTasemicolon.Forexample:

Pic.Print "Hello"

Pic.Print

Pic.Print "Hello"

Thiswillprintas:

Hello

Itisimportanttorememberthatiftheﬁrstprinthasasemicolonattheend,oftenreferred

toasatrailingsemicolon,theemptyprintwillonlyreverseit,andprintthesecondHello

onthenextline,andnoblanklinewillappear.

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