c# convert pdf to multipage tiff : Add text box in pdf document Library application component .net html azure mvc Visual_Basic2-part1671

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
14
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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/
1
.
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
2
, OCXs
3
, or r type library
4
. Component
referencesareaddedtotheproject,sothatallpartsoftheprogrammayinteractwiththe
outsidecomponent.
Objectreference
Istypically apointer toaninternalobject
5
. 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
1
Chapter17onpage91
2
http://en.wikibooks.org/wiki/..%2FDLL
3
http://en.wikibooks.org/wiki/..%2FOCX
4
http://en.wikibooks.org/wiki/..%2Ftypelib
5
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
6
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
As
Beep
Call
Close
Command
Date
Do
End
Error
Event
Exit
False
For
Function
Get
GoTo
If
Input
Kill
Let
Load
Loop
Me
Name
Next
Not
Nothing
On
Option
Or
Print
Private
Public
Put
Reset
Resume
Set
Step
6
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
7
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.
7
Chapter25.10.2onpage137
20
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:
21
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"
Pic.Print "Hello"
Theywillappearonseparatelinesas:
Hello
Hello
Thiscanbeeasilydealtwithintheneedofhavingseparateprintstatementsprintonthe
sameline. Youmerelyhavetochangethecodeto:(notethesemicolon)
Pic.Print "Hello";
Pic.Print "Hello"
Thiswillappearas:
HelloHello
22
Simpleoutput
Ifyouwanttomakeablanklineinbetweenthetwo"hello"'s,thenyoumaysimplyhavea
blankprintstatementWITHOUTasemicolon.Forexample:
Pic.Print "Hello"
Pic.Print
Pic.Print "Hello"
Thiswillprintas:
Hello
Hello
Itisimportanttorememberthatifthefirstprinthasasemicolonattheend,oftenreferred
toasatrailingsemicolon,theemptyprintwillonlyreverseit,andprintthesecondHello
onthenextline,andnoblanklinewillappear.
23
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