how to open a .pdf file in a panel or iframe using asp.net c# : Extract text from pdf image SDK control service wpf web page winforms dnn googlespreadsheetprogramming-sample3-part767

Chapter3:User-DefinedFunctions
26
3.7 UsingJSDoc To DocumentFunctions
JSDocisamarkuplanguage,inspiredbyitsJavaequivalentcalled
Javadoc,foraddingcommentsandstructuredannotationtoJavaScript
code. A sub-set of JSDoc can be used to document user-defined
functions.The JSDocmarkupcanthenbeextractedusing various
tools to auto-generate documentation. It is defined by a special
typeofmulti-linecommentingwheretheopeningcommenttagis
definedwithaspecialopeningtagofaforwardslashfollowedbya
doubleasterisk:
1
/**
2
* Line describing the function
3
* @param {data type} parameter name
4
* @return {data type}
5
* @customfunction
6
*/
Thedocumentationexampleabovecontainsadescriptionlineand
three types of annotation tags denoted by a leading “@”. Each
function paramater shouldbe assignedan @param tag denoting
the expected data type andthe parameter name. Unsurprisingly,
thereturndatatypeisgiventhe@returntag.Thefinaltagiscalled
@customfunction and it is used to signify that the function is is
intendedtobecalledasauser-definedfunction.WhenJSDocisused
withthistag,theuser-definedfunctionsappearintheautocomplete
on entering the function name preceded by an equals sign in a
spreadsheetcell.
3.8 Checking Input And Throwing Errors
JavaScriptfunctionsareflexibleandcanbecalledwithanynumber
ofargumentsofanytype.Stricterlanguagesoffersomeprotection
Extract text from pdf image - extract text content from PDF file in C#.net, ASP.NET, MVC, Ajax, WinForms, WPF
Feel Free to Extract Text from PDF Page, Page Region or the Whole PDF File
copy text pdf; copy and paste text from pdf
Extract text from pdf image - VB.NET PDF Text Extract Library: extract text content from PDF file in vb.net, ASP.NET, MVC, Ajax, WinForms, WPF
How to Extract Text from PDF with VB.NET Sample Codes in .NET Application
copy pdf text to word with formatting; copying text from pdf to excel
Chapter3:User-DefinedFunctions
27
againstbadargumentvalues. Most languagesthrow errors ifthe
passedargumentcountdoesnotmatchtheparameter countwhile
staticlanguagessuchasJavacheckthegivendatatypesoffunction
andmethodarguments. JavaScript takesaveryrelaxedapproach
butinappropriateargumenttypescancauseerrorsor,moreseriosly,
bugs where the return value may not be what you expect. For
example:
CodeExample3.4
1
// Function that is expected
2
// to add numbers but will also
3
// "add" strings.
4
function adder(a, b) ) {
5
return b;
6
}
7
// Test "adder()" with numeric arguments
8
// and with one numeric and one string
9
// argument.
10
function run_adder() {
11
Logger.log(adder(12));
12
Logger.log(adder('cat', 1));
13
}
The problem here is twofold. Firstly, the adder() function takes
argumentsofanytype.Secondly,the+operatorcandostringcon-
catenationaswellasnumericaddition.Whenoneoftheoperands
isastring, JavaScriptsilently coercesthe other argument to type
string. Although this example is contrived, it does illustrate a
potential source of bugs. One way to guard against this is to
explicitlycheckeachargumenttypeandthenthrowanerrorifany
oftheargumentsisofthewrongtype.Thetypeof operatorcanbe
usedtodothis.Here isaversionofthe adder()functionthatdoes
exactlythis:
CodeExample3.5
C# PDF Image Extract Library: Select, copy, paste PDF images in C#
Image: Extract Image from PDF. |. Home ›› XDoc.PDF ›› C# PDF: Extract PDF Image. How to C#: Extract Image from PDF Document.
can't copy text from pdf; c# extract pdf text
VB.NET PDF Image Extract Library: Select, copy, paste PDF images
Image: Extract Image from PDF. |. Home ›› XDoc.PDF ›› VB.NET PDF: Extract PDF Image. VB.NET PDF - Extract Image from PDF Document in VB.NET.
copy formatted text from pdf; extract pdf text to word
Chapter3:User-DefinedFunctions
28
1
// Function that is expected
2
// to add numbers but will also
3
// "add" strings.
4
function adder(a, b) ) {
5
return b;
6
}
7
8
// Function that checks that
9
// both arguments are of type number.
10
// Throws an error if this is not true.
11
function adder(a, b) ) {
12
if (!(typeof a === 'number' &&
13
typeof b === 'number')) {
14
throw TypeError(
15
'TypeError: ' +
16
'Both arguments must be numeric!');
17
}
18
return b;
19
}
20
21
// Test "adder()" with numeric arguments
22
// Thrown error is caught, see logger.
23
function run_adder() {
24
Logger.log(adder(12));
25
try {
26
Logger.log(adder('cat', 1));
27
} catch (error) {
28
Logger.log(error.message);
29
}
30
}
Nowthefunctionadder()throwsanerrorifeitherofthearguments
isnon-numeric. The test function run_adder() uses atry .. catch
constructtodealwiththeerror.Detectinganddealingwithincor-
rectargumentsinfunctionsmayormaynotbeaprioritydepending
C# PDF insert image Library: insert images into PDF in C#.net, ASP
Free PDF image processing SDK library for Visual Studio .NET program. Powerful .NET PDF image edit control, enable users to insert vector images to PDF file.
get text from pdf into excel; copy paste pdf text
VB.NET PDF insert image library: insert images into PDF in vb.net
VB.NET code to add an image to the inputFilePath As String = Program.RootPath + "\\" 1.pdf" Dim doc New PDFDocument(inputFilePath) ' Get a text manager from
extract text from pdf using c#; c# read text from pdf
Chapter3:User-DefinedFunctions
29
on circumstances. The typeof operator is adequate for primitive
datatypessuchasnumbersandstringsbutlimitedforobjects.For
example, itreportsarraysastype object, true butnotveryuseful.
Whenpassingobjectstofunctions,theinstanceof operatorisbetter
suitedfortypechecking.
3.9 EncapsulatingA Complex Calculation
The relative standard d deviation¹³ (RSD) is frequently used in
statisticsto expressandcompare variability ofdatasets. Itisnot
providedasabuilt-inspreadsheetfunction.Theformulatocalculate
itissimplythe sample standard deviationdividedby the sample
meanmultipliedby100.Giventhe followingvaluesincellsA1to
A10: 19.81 18.29 21.4722.5420.17 20.117.61 20.91 21.6219.17The
RSD roundedto two decimal places canbe calculatedusing this
spreadsheetformula:
1
=ROUND(100*(STDEV(A1:A10)/AVERAGE(A1:A10)),2)
The functionality expressed in this spreadsheet formula can be
encapsulatedinauser-definedfunctionasfollows:
CodeExample3.6
¹³
http://en.wikipedia.org/wiki/Relative_standard_deviation
C# Create PDF from images Library to convert Jpeg, png images to
If you want to turn PDF file into image file format in C# application, then RasterEdge XDoc.PDF for .NET can also help with this.
.net extract pdf text; copy text from pdf reader
C# PDF insert text Library: insert text into PDF content in C#.net
Text to PDF. C#.NET PDF SDK - Insert Text to PDF Document in C#.NET. Providing C# Demo Code for Adding and Inserting Text to PDF File Page with .NET PDF Library.
copy text from pdf in preview; copy paste text pdf file
Chapter3:User-DefinedFunctions
30
1
/**
2
* Given the man and standard deviation
3
* return the relative standard deviation.
4
*
5
* @param {number} stdev
6
* @param {number} mean
7
* @return {number}
8
* @customfunction
9
*/
10
function RSD (stdev, mean) ) {
11
return 100 * (stdev/mean);
12
}
Thisfunctioncanbecalledasfollows:
1
=RSD(STDEV(A1:A10),AVERAGE(A1:A10))
Figure3-3:*CallingtheRSDfunctioninGoogleSheetswithprovidedauto-
complete.
TheabovefunctioncanbepastedintotheScriptEditorandcalled
asdescribedinthedocumentation.Sowhatwasgainedbywriting
auser-definedfunctionwhenacombinationofspreadsheetbuilt-
infunctionscanbeusedandtheuser-definedversionstillusesthe
spreadsheetSTDEV andAVERAGE built-ins? Firstly, the calcula-
tionnowhasameaningfulname.Secondly,argumentcheckingcan
be addedasdescribedin the previoussection. Lastly, the logic is
capturedinoneplaceandisdocumented.Theseareallgoodreasons
C# PDF Page Extract Library: copy, paste, cut PDF pages in C#.net
Page: Extract, Copy and Paste PDF Pages. Easy to Use C# Code to Extract PDF Pages, Copy Pages from One PDF File and Paste into Others in C#.NET Program.
copy text from encrypted pdf; get text from pdf image
VB.NET PDF Form Data Read library: extract form data from PDF in
featured PDF software, it should have functions for processing text, image as well how to read or retrieve field data from PDF and how to extract and get
extract pdf text to excel; pdf text replace tool
Chapter3:User-DefinedFunctions
31
to consider replacing complex spreadsheet formulas with user-
definedfunctions.Inaddition, ourJSDocdescriptionnowappears
intheautocomplete.
3.10 Numeric Calculations
Thefollowingexampletakesasinglenumericargumentasdegrees
Centigrade and uses that argument to return the temperature in
Fahrenheit.Touse,paste thefunctionintothe GoogleAppsScript
editorandthencallitbynameinacellinthe containing spread-
sheet.Forexample,ifcellA1containsthevalue0,thentheformula
=CELSIUSTOFAHRENHEIT(A1)incellB1willreturnthe result32
asexpected.
CodeExample3.7
1
/**
2
* Given a temperature in Celsius, return Fahrenheit va\
3
lue.
4
*
5
* @param {number} celsius
6
* @return {number}
7
* @customfunction
8
*/
9
function CELSIUSTOFAHRENHEIT(celsius) {
10
if (typeof celsius !== 'number') {
11
throw TypeError('Celsius value must be a number');
12
}
13
return ((celsius * 9/ 5+ 32;
14
}
Function CELSIUSTOFAHRENHEIT takesa numeric value repre-
sentingdegreesCelsiusandreturnstheFahrenheitequivalent.Be-
foreperformingthecalculation,itfirstchecksthatthegivenvalueis
Chapter3:User-DefinedFunctions
32
numeric,ifnot,itthrowsatypeerror.Hereisascreenshotshowing
someinputvaluesandtheoutputsaftercallingthisfunction:
Figure3-4:Inputandoutputforuser-definedfunctionCELSIUSTOFAHREN-
HEITand.
See howthe thrownerrorisreportedasacommentincellsA5to
A8.Withoutthetypeof check,the date valueincellA7wouldbe
interpretedasanumberofsecondsandwouldreturnanunfeasibly
large value. The outcome of evaluating the cell A6 isevenmore
insidiousbecausetheblankisinterpretedaszeroandthefunction
evaluatesto32. Indeed,0Celsiusisequalto32Fahrenheitbutthis
is highly misleading. Remove or comment out the typeof check
and see the effect! The textvalue in cell A5 will throw anerror
regardlessofthe typeof check, whichistobeexpected. However,
the default interpretation ofdatesasnumbersand blank cellsas
zero isaserioustrap for theunwary. The sameproblemoccursin
ExcelVBAandismore difficulttoguardagainst.Thisexample of
auser-definedfunctionisverysimplebutithighlightstheneedfor
rigorouscheckingofinputs.
Verifying that arguments are within a valid range may also be
requiredtoavoidinvalidreturnvalues.Asanexample,theformula
tocalculatetheareaofacircleissimple:Π*radius
2
.Thefollowing
functiondoesthisbutitalsochecksthatthegivenargumentisboth
Chapter3:User-DefinedFunctions
33
numericandnotlessthanzero.
CodeExample3.8
1
/**
2
* Given the radius, return the area of the circle.
3
* @param {number} radius
4
* @return {number}
5
* @customfunction
6
*/
7
function AREAOFCIRCLE (radius) {
8
if (typeof radius !== 'number' || radius < 0){
9
throw Error('Radius must be a positive number');
10
}
11
return Math.PI (radius radius);
12
}
Inexample3.8,thefunctionexpectsasinglenumericargumentfor
thecircleradius.However,sinceanegativeradiusmakesnosense
inthiscontext,thereisanadditionalchecktoensurethattheradius
givenisnotnegative.Ifeither oftheseconditionsfails,anerroris
thrown (|| is the or operator). In thisexample, bothchecks were
performedtogeter using the or operator. If greater granularity is
required, the checks could be performed in two separate checks
thatwould yieldtwo different errors. Thisapproach helpswhen
functionsarepartoflargerapplications.
3.11 DateFunctions
GoogleSheetsprovidesacomprehensivesetofdatefunctions,see
here¹⁴forthefulllist.However,iftheprovidedfunctionsdonot
cover your requirements, you can write your own in GAS and
¹⁴
https://support.google.com/docs/table/25273?hl=en&rd=2
Chapter3:User-DefinedFunctions
34
call them fromyour spreadsheet as user-defined functions. Some
cautionarywords:Datesandtimescanbequitecomplicatedinany
applicationorprogramminglanguagewhereyouhavetoallowfor
timezones,daylightsavingtimechangesandleapyearssorigorous
testingofinputsandoutputsishighlyadvidable.
TheexamplesgivenherealsocoversomeimportantbasicJavaScript
concepts such as date manipulation, objects and methods and
JavaScriptarrays.
Thefirstexample(3.9)takesadateasitssoleargumentandreturns
thedayname(inEnglish)forthatdate.
CodeExample3.9
1
/**
2
* Given a date, return the name of the
3
* day for that date.
4
*
5
* @param {Date} date
6
* @return {String}
7
* @customfunction
8
*/
9
function DAYNAME(date) {
10
var dayNumberNameMap {
11
0: 'Sunday',
12
1: 'Monday',
13
2: 'Tuesday',
14
3: 'Wednesday',
15
4: 'Thursday',
16
5: 'Friday',
17
6: 'Saturday'},
18
dayName,
19
dayNumber;
20
if(date.getDay ) ) {
21
throw TypeError(
Chapter3:User-DefinedFunctions
35
22
'TypeError: Argument is not of type "Date"!');
23
}
24
dayNumber = date.getDay();
25
dayName = dayNumberNameMap[dayNumber];
26
return dayName;
27
}
Themostinterestingpointsinthe code example3.9aretheuse of
the object named dayNumberNameMap, how the argument type
ischeckedandhowtheDateobjectmethodgetDay()isused.The
variabledayNumberNameMap isaJavaScriptobject.Sinceobjects
arecornerstonesofJavaScriptprogramming,hereisashortdetour
thatdescribes them. Attheir simplest, JavaScriptobjects provide
a mapping of keys to values. The values are called “properties”
and theycan be other objects, scalar values, arrays or functions.
When object properties are functions, they are known as meth-
ods. JavaScriptobjects are analogousto hashesor dictionaries in
other languages. Theverypopulardatainterchange formatcalled
JavaScript Object Notation (JSON) isbased on them. Excel VBA
offers aDictionary Object fromtheMicrosoftScriptingLibrary¹⁵
thatprovides similar functionality but is much less flexible. The
objectintheexample above mapsindex numberstothenamesof
the daysofthe week. Returning to the code example above, the
dateargumentisexpectedtobe oftype Date andthe mechanism
usedto testfor it, thatisthe line if(!date.getDay ){, meritssome
explanation.IftheargumentisaDateobject,thenitwillimplement
agetDate() method. The test here is to see ifthe propertyexists,
noticehowthegetDate()methodisnotcalledbecausethereareno
parentheses.IftheargumentdoesnothaveagetDateproperty,then
anerrorisraised. Thistype ofcheckingformethodsonobjectsis
commoninclient-side(browser)JavaScriptwhereimplementations
fromdifferentvendorsmayormaynotprovidecertainmethods.If
theargumentpassesthetypecheck,thenwearesatisifiedthatitisa
¹⁵
https://support.microsoft.com/en-us/kb/187234/
Documents you may be interested
Documents you may be interested