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WhatisVisualBasic6.0?

"

Visual"

referstotheuseofvisualizationofthedevelopmentofgraphicaluserinterface（GUI）,generallydonotneedtopreparealargenumberofcodeinterfaceelementstodescribetheappearanceandlocation,andaslongasnecessarytodraganddropcontrolsonthescreentothecorrespondinglocationwillbe;

Basic"

referstotheBASIClanguage,VisualBasic6.0isbecausetheoriginalBASIClanguagedevelopedonthebasisofthatsofarincludeshundredsofphrasesFunctionandkeywords,andmanyWindowsGUIaredirectlyrelated.ProfessionalscanuseVisualBasic6.0toanyotherWindowsprogramminglanguagefunction,youbeginnersandseveralKeywordscanestablishpracticalapplication.

VisualBasic6.0providesalearningversion,ProfessionalEditionandEnterpriseEditiontomeettheneedsofdifferentdevelopers.LearningversionenablesprogrammerstoeasilydevelopWindowsandWindowsNTapplications;

ProfessionalEditionforprofessionalprogrammerstoprovidethecompletefunctionsofdevelopmenttools;

EnterpriseEditionallowsprofessionalstoformthegrouptocreateastrongdistributedapplications.

1VisualBasic6.0features

VisualBasic6.0isrunningontheWindowsplatformunderavisualizationofhigh-levelprogramminglanguages.Sinceinceptionin1991.VisualBasic6.0windows3.xtoadapttotheWindows95/98andWindowsNTetc.versionoftheoperatingsystem,widelyusedinordinarywindowcategory,databasemanagementcategory,datacommunicationsnetworkforsuchapplicationdevelopment.VisualBasic6.0asacomputervisualizationoftheseniorprogramminglanguage,thefollowingnotablefeatures:

（1）VisualBasic6.0inheritedtheBasiclanguageiseasyfeaturesinMicrosoftVisualBasic6.0developmentprocessneverforgethisroots,programming,evenforbeginnersisaprincipleofcomputer-illiteratepeople,alsoinarelativelyshortperiodoftimetoprepareaviableWindowsprocedures.

（2）BasedontheDosandtheenvironmentthantheprogramminglanguage,VisualBasic6.0thinkingaboutafundamentalchangebasedontheDosandtheenvironmentthantheprogramminglanguage,VisualBasic6.0thinkingaboutafundamentalchangeintheintroductionoftheVisualBasic6.0Object-orientedprogramdesign,theprocessdesignstafffromthetediousdetailsoftheproceduresdesignedtoextricatethemselves,programmingstaffduringprogramdevelopment,choosetherightpeopleneedtostructuretheirowninterface.Thenarrangementsforareceptionobjecttowhatinformationdowhatevertheycan.Withouttheneedtoconsiderspecifictargetsofwhattodo,whattodo,whattodoaftertheissue.

（3）VisualBasic6.0haspowerfuldatabasemanagementfunctionsVisualBasic6.0supportSQLdatabaseinquiries,VisualBasic6.0embeddeddatabasemanagementfunctionscanbemanipulatedalmostallofthedatabaseformat.

（4）DevelopmentofhighlyintegratedenvironmentisaVisualBasic6.0includingediting,debuggingprocedures,operatingprocedures,Compilingproceduressuchasfunctionalintegrationprogramdevelopmentenvironment（IDE）

（5）VisualBasic6.0adaptationinthedevelopmentofWindows-typeapplicationVisualBasic6.0sequencecontainsalotoffunctions,ordersandkeywords,MostWindowsgraphicaluserinterface-related,professionalscaneasilyusethemtodeveloppowerfulWindowsapplication.

2VisualBasic6.0Commoninternalcontrols

Controloptionscanbedividedintocheckboxcontrol（Checkbox）andtheradiobuttonscontrol（OptionButton）.Checkboxcontrol,thegrouprevealedanumberofoptions,providedtheseoptionsTrue,FalseorYes,Nooption,userscanchoosewhichoneormore;

OptionButtoncontrols,theusercanchoosesinglegroup.OptionButtonandCheckboxcontrolsimilarfunctions,however,theyalsoexistbetweenthoseimportantdifferences:

thesamegroups,mayalsoselectmultipleCheckboxoptions;

ButtheycanonlychooseoneoptionButton.InFrame,PictureBoxFormcontainersorusebothoptionscontrols,Userscanusegroup.

（1）Radiobuttonscontrol（OptionButton）intheapplicationprocess,Sometimesusersneedssuchachoice:

Severaloptionsweretheonlychoice-species,andmustmakeachoice.Severalbecauseitismutuallyexclusive.Then,ontheneedtouseOptionButtonbuttonscontrol;

Figure1isagroupofbuttonscontrols,itonlyallowsusersinchoosingadrink,andmustelection-species.Controlbuttonsarealwaysagroupintheformof.Inacontrolgroup,onlyoneisalwaysbuttonsatselectedstate;

ifselectedbyoneofthem.Theremainingbuttonswillautomaticallyremovenon-selected.

（2）Checkboxcontrol（Checkbox）CheckboxcontrolandOptionButtonControlssomewhatsimilar,buttheuseofaverydifferent,CheckBoxcontrolsthatworkindependentlyofeachother,andtheyseparatedwithouttheslightestrelationshipofchecksandbalances.Allelectedornotonecanbeelected.Eachoneisanindependent,inwhichoneormoreoptional.

（3）FrameControlsControlframeworkisaverysimplecontrols,ItsmissionisthePaleozoicbodydrawingagreatsenseofthethree-dimensionalframework,Itisacommonattributecaptionattributetoshowthattheframeworkofthetitle.FrameControlsrarelyusedaloneanditisalwayswithothercontrolswiththeuse.Forexample,wecanintheTextBox,pictureframesandanexternaladdaframeworktoincreasethethree-dimensionaleffect,andsoon.

3VisualBasic6.0ProgrammingLanguage

Inhumansociallife,"

language"

ispronunciation,vocabularyandgrammarconstitutethesystem,person-to-persontransmissionofinformation,exchangeideastool."

ProgrammingLanguage"

（alsocalledalgorithmlanguage）isaword,phrase,andtherulesofgrammarconstitutethedirectivesystemandthecomputerisatoolfortheexchange.Useprogramminglanguage,weonlyneedtotellthecomputerwhenandunderwhatconditionstheydo,computerwillbeinaccordancewitharequesttoimplementadirective,andtheimplementationtellustheresults.

Fromthemachineryoftheimplementationperspective,theprogramminglanguagecanbedividedintotwomajorcategories:

lowlevellanguageandhigh-levellanguage.Lowlevellanguageisthemachine-orientedinstructions,differentmodelsoftheCPU（CentralProcessingUnit,acronymfortheCPU）havedifferentinstructionsystem.Lowlevellanguageisdividedintomachinelanguageandassemblerlanguage.Machine-languageinstructionscontainonlybythe"

0"

and"

1"

binarysymbolsformedbycertainlaws,machinescanbedirectlyexecuted.Thesedirectivesmemoryquitedifficult,forpeopleontheuseofspecificMnemonicrepresentatives’machineryordersresultinginassemblylanguage.Assemblerlanguageproceduresrequireonlyasimpletranslationmachinescanbeimplemented.Lowlevellanguageischaracterizedbyfasterprocedures,highefficiency,buttheprogrammerisrequiredtounderstandthemachinestructure,Programmingdifficultfornon-specialiststogetinvolved.Seniorlanguageiseasilyacceptedbythepeople;

closetohumanlanguagetodescribethewayconstituteInstructionSystem.Itneednotmachine-oriented,constitutesimple,usuallyonlyonehundredscoresofvocabulary,someoftherulesthatallowmemory,andeasytolearn.Programmingspeed.Peoplesay"

programminglanguages"

usuallyreferstohigh-levellanguage.Seniorlanguageproceduresrequiremorecomplexcompilerdirectivesinordertobecomemachines.Indifferentapplicationsoftenusedifferentlanguagedesignapplications.

VisualBasic6.0languageisacommonseniorprogramminglanguage.Computerapplicationareasisextensive,inordertomeetdifferentneeds,programminglanguage,oftenalsothecharacteristics.Forexample,asystemsuitableforthepreparationofthesoftware,facilitatescientificcomputing,databasemanagementisgoodat.Suitablegraphicdesignaswellasdedicatedtoartificialintelligence,therearealsosomelanguagealsohavemultiplefunctions.Fromtheapplicationperspective,wecanrightprogramminglanguageforthestrictclassification.Moreover,withthedevelopmentofcomputerscienceandapplicationoftherapidexpansionofvariouslanguageversionsareconstantlychanging,functioncontinuouslyupdateandenhance.Eachperiodhasanumberoflanguageinpopular,therewereanumberoflanguageinthedisappearance.Weshouldgraspprogramminglanguageinnature,regularityofthings.

Tomeetspecificneeds,computerworkersdevelopedavarietyofsoftwaretools.Forexample,wordprocessing,spreadsheet,graphics,multimediamanagement,andsystemsmanagementtoolssuchassoftware.Theyaresomespecialproceduresforcollection.Userinterfaceandinteractivecomputeroperation,whichiscalledamongthevarioussubroutines.

However,theworldiscomplexandconstantlychanging,itwillrequirethecomputertodotheworkofdiversity.Wecansaythatthemodernworldofcomputerdemandisendless.ComputermanufacturerscontinuetoproducemoreandmorepowerfulandfunctionalcomputersystemSoftwaredevelopershavebeendesignedtomeetdifferentneedsoftheapplication.Butnomatterhowthestructureofthecomputer,ithastodothework,itwasalwaysusedasaformofa"

withthecomputerexchange.Fromthisideaofthecomputersystemcanbeseen