devexpress asp.net pdf viewer : Copy web page to pdf SDK Library API wpf asp.net web page sharepoint AppleShellScripting-20144-part686

Forexample,thefollowingcommandcreatesafilecalled
MyFile
andfillsitwithasinglelineoftext:
echo "a single line of text" > MyFile
Appendingdataisjustaseasy.Thefollowingcommandappendsanotherlineoftexttothefile
MyFile
.
echo "another line of text" >> MyFile
Youshouldnoticethattheredirectoperator(
>
)createsafile,whiletheappendoperator(
>>
)appendstothe
file.
Many(butnotall)Bourne-compatibleshellssupportathirdoperatorinthisfamily,themergingredirectoperator
(
>&
)thatredirectsstandarderrorandstandardoutputsimultaneouslytoafile.Forexample:
ls . THISISNOTAFILE >& filelistwitherrors
Thiscreatesafilecalled
filelistwitherrors
,containingbothalistingofthecurrentdirectoryandanerror
messageaboutthenonexistenceofthefile
THISISNOTAFILE
.Thestandardoutputandstandarderrorstreams
aremergedandwrittenouttotheresultingfile.
ShellInputandOutput
PipesandRedirection
2014-03-10   |   Copyright © 2003, 2014 Apple Inc. All Rights Reserved.
41
Copy web page to pdf - SDK Library API:C# PDF Page Extract Library: copy, paste, cut PDF pages in C#.net, ASP.NET, MVC, Ajax, WinForms, WPF
Easy to Use C# Code to Extract PDF Pages, Copy Pages from One PDF File and Paste into Others
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Copy web page to pdf - SDK Library API:VB.NET PDF Page Extract Library: copy, paste, cut PDF pages in vb.net, ASP.NET, MVC, Ajax, WinForms, WPF
Detailed VB.NET Guide for Extracting Pages from Microsoft PDF Doc
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Compatibility Note:  NotallBourneshellvariantssupportthe
>&
operatorwhenusedinthisway.
ThissimplifiedbehaviorisnotspecifiedbyPOSIX,andafewshells(mostnotably
ash
anditsDebian
derivative,
dash
)generateanerrorifyoutrytousethisoperatorwithoutspecifyingafiledescriptor
numberafterthe
>&
.Formaximumportability,youshouldredirectstandardoutputtoafile,then
separatelycombinestandarderrorintostandardoutputlikethis:
ls . THISISNOTAFILE > filelistwitherrors 2>&1
SeePipesandFileDescriptorRedirection(BourneShell) (page 42)formoreinformationaboutusing
filedescriptorredirectiontocombinefiledescriptors.
Note:  The
>&
operatorisalsoverypowerfulwhenusedforfiledescriptorredirection.Additional
usesbeyondbasicusearedescribedinmoredetailinPipesandFileDescriptorRedirection(Bourne
Shell) (page 42)andScriptingInteractiveToolsUsingFileDescriptors (page 211).
PipesandFileDescriptorRedirection(BourneShell)
Thesimplestexampleoftheuseofpipesistopipethestandardoutputofoneprogramtothestandardinput
ofanotherprogram.Typethefollowingonthecommandline:
ls -l | grep 'rwx'
Youwillseeallofthefileswhosepermissions(orname)containtheletters
rwx
inorder.The
ls
command
listsfilestoitsstandardoutput,andthe
grep
commandtakesitsinputandsendsanylinesthatmatcha
particularpatterntoitsstandardoutput.Betweenthosetwocommandsisthepipeoperator(
|
).Thistellsthe
shelltoconnectthestandardoutputof
ls
tothestandardinputof
grep
.
Wherethedistinctionbetweenstandardoutputbecomessignificantiswhenthe
ls
commandgivesanerror.
ls -l THISFILEDOESNOTEXIST | grep 'rwx'
Youshouldnoticethatthe
ls
commandissuedanerrormessage(unlessyouhaveafilecalled
THISFILEDOESNOTEXIST
inyourhomedirectory,ofcourse).Ifthe
ls
commandhadsentthiserrormessage
toitsstandardoutput,itwouldhavebeengobbledupbythe
grep
command,sinceitdoesnotmatchthe
pattern
rwx
.Instead,the
ls
commandsentthemessagetoitsstandarderrordescriptor,whichresultedinthe
messagegoingdirectlytoyourscreen.
ShellInputandOutput
PipesandRedirection
2014-03-10   |   Copyright © 2003, 2014 Apple Inc. All Rights Reserved.
42
SDK Library API:C#: How to Add HTML5 Document Viewer Control to Your Web Page
for this example we will work with a new page. Then, copy the following lines of code to the head load the necessary resources for creating web document viewer
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SDK Library API:C# HTML5 Viewer: Load, View, Convert, Annotate and Edit PDF
for C# .NET is an advanced web viewer of freehand annotation, lines, figures and highlight annotations to PDF page. can select PDF text region, copy and paste
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Insomecases,however,itcanbeusefultoredirecttheerrormessagesalongwiththeoutput.Youcandothis
byusingaspecialformofthecombiningredirectionoperator(
>&
).
Beforeyoucanbegin,though,youneedtoknowthefiledescriptornumbers.Descriptor0isstandardinput,
descriptor1isstandardoutput,anddescriptor2isstandarderror.Thus,thefollowingcommandcombines
standarderrorintostandardoutput,thenpipestheresulttogrep:
ls -l THISFILEDOESNOTEXIST 2>&1 | grep 'rwx'
Thisoperatorisalsooftenusefulifyourscriptneedstosendamessagetostandarderror.Thefollowing
commandsends“anerrormessage”tostandarderror:
echo "an error message" 1>&2
Thisworksbytakingthestandardoutput(descriptor1)oftheechocommandandredirectsittostandarderror
(descriptor2).
Youshouldnoticethattheampersand(
&
)appearstobehavesomewhatdifferentlythanitdidinBasicFile
Redirection (page 40).Becausetheampersandisfollowedimmediatelybyanumber,thiscausestheoutput
ofonedatastreamtobemergedintoanotherstream.Inactuality,however,theeffectisthesame(assuming
yourshellsupportstheuseof
>&
byitself).
Theredirect(
>
)operatorimplicitlyredirectsstandardoutput.Whencombinedwithanampersandandfollowed
byafilename,insomeshells,itmergesstandardoutputandstandarderrorandwritestheresulttoafile,
thoughthisbehaviorisnotportable.Byspecifyingnumbers,yourscriptiseffectivelyoverridingwhichfile
descriptortouseasitssourceandspecifyingafiledescriptortoreceivetheresultinsteadofafile.
ShellInputandOutput
PipesandRedirection
2014-03-10   |   Copyright © 2003, 2014 Apple Inc. All Rights Reserved.
43
SDK Library API:VB.NET PDF Convert to HTML SDK: Convert PDF to html files in vb.
using RasterEdge.XDoc.PDF; This professional .NET solution that is designed to convert PDF file to HTML web page using VB.NET code efficiently.
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SDK Library API:C# Image: How to Integrate Web Document and Image Viewer
RasterEdgeImagingDeveloperGuide8.0.pdf: from this user manual, you can Please copy these directories to the root of Embed Document Viewer to Your ASPX Web Page.
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Note:  Becarefulwhenmixingnormalredirectionwithfiledescriptormerging.Thefollowing
commandcombinesstandardoutputandstandarderrorintoasingleoutputfile.
ls . BOGUSFILENAME > filelistwitherrors 2>&1
Ifyoureversetheorderoftheredirects,however,onlystandardoutputiswrittenintothefile.
ls . BOGUSFILENAME 2>&1 > just the file
Further,ifyoupipetheresultofthesecondversionaboveintoanotherutility,itwillreceivethe
standarderroroutputfromthe
ls
command.
PipesandFileDescriptorRedirection(CShell)
TheCshelldoesnotsupportthefullsetoffiledescriptorredirectionthattheBourneshellsupports.Insome
cases,alternativesareprovided.Forexample,youcanpipestandardoutputandstandarderrortothesame
processusingthe
|&
operatorasshowninthefollowingsnippet:
ls -l THISFILEDOESNOTEXIST |& grep 'rwx'
Someotheroperations,however,arenotpossible.Youcannot,forexample,redirectstandarderrorwithout
redirectingstandardoutput.Atbest,ifyoucandeterminethatyourstandardoutputwillalwaysbe
/dev/tty
,
youcanworkaroundthisbyredirectingstandardoutputto
/dev/tty
first,thenredirectingboththenow-empty
standardoutputandstandarderrorusingthe
>&
operator.Forexample,toredirectonlystandarderrorto
/dev/null
,youcoulddothis:
(ls > /dev/tty) >& /dev/null
Thistechniqueisnotrecommendedforgeneraluse,however,asitwillsendoutputtoyourscreenifanyone
runsyourscriptwithstandardoutputsettoafileorpipe.
Youcanalsoworkaroundthisusingafile,butnotinaninteractiveway.Forexample:
(ls > /tmp/mytemporarylslisting) >& /dev/null
cat /tmp/mytemporarylslisting
Itis,however,possibletodiscardstandardoutputandcapturestandardinput.Forexample:
ShellInputandOutput
PipesandRedirection
2014-03-10   |   Copyright © 2003, 2014 Apple Inc. All Rights Reserved.
44
SDK Library API:C# Word: How to Create Word Online Viewer in C# Application
want to add C#.NET Word Web Viewer to your web page, you should add a new Web Form to Please copy the following demo code to the head of Default.aspx to
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SDK Library API:C# PDF Convert to SVG SDK: Convert PDF to SVG files in C#.net, ASP
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(ls / /bogusfile > /dev/null) |& more
ItisnotpossibletoredirectmessagestostandarderrorusingtheCshellunlessyouwriteaBourneshellscript
orCprogramtodotheredirectionforyou.
ShellInputandOutput
PipesandRedirection
2014-03-10   |   Copyright © 2003, 2014 Apple Inc. All Rights Reserved.
45
SDK Library API:VB.NET PDF - VB.NET HTML5 PDF Viewer Deployment on IIS
This page will navigate users how to deploy HTML5 PDF Document IIS server .NET framework is 4.0 or higher, please copy the content in the Web(for .net4
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SDK Library API:C# HTML5 PDF Viewer SDK deployment on IIS in .NET
This page will navigate users how to deploy HTML5 PDF Document IIS server .NET framework is 4.0 or higher, please copy the content in the Web(for .net4
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Thetopicsofflowcontrol,expansion,andparsingmayseemsomewhatdisparate,buttheyarecloselyrelated
inthecontextofBourneshellscripts.
Inparticular,becauseofthetokensplittingrules,parsingandexpansionaremostlikelytomakeabehavioral
differenceinthecontextofcontrolstatements(
if
,
while
,andsoon).
Similarly,tofullyunderstandvariableexpansion,youmustunderstandhowitinteractswithparsing,including
whenthecontentsofvariablesundergofurthertokensplitting.
Becauseofthecomplexrelationshipbetweenthesetopics,theyaredescribedtogetherinasinglechapter.
BasicControlStatements
Theexamplesinpreviouschaptershavebeenverybasic,linearprograms.Thissectionshowshowtoaddflow
controlstatementsthatallowformorecomplexprograms.
TheifStatement
Thefirstcontrolstatementyoushouldbeawareofinshellscriptingisthe
if
statement.Thisstatementbehaves
verymuchlikethe
if
statementinotherprogramminglanguages,withafewsubtledistinctions.
Thefirstdistinctionisthatthetestperformedbythe
if
statementisactuallytheexecutionofacommand.
Whentheshellencountersan
if
statement,itexecutesthestatementthatimmediatelyfollowsit.Depending
onthereturnvalue,itwillexecutewhateverfollowsthe
then
statement.Otherwise,itwillexecutewhatever
followstheelsestatement.
Theseconddistinctionisthatinshellscripts,manythingsthatlooklikelanguagekeywordsareactually
programs.Forexample,thefollowingcodeexecutes
/bin/true
and
/bin/false
.
# always execute
if true; then
ls
else
echo "true is false."
2014-03-10   |   Copyright © 2003, 2014 Apple Inc. All Rights Reserved.
46
Flow Control, Expansion, and Parsing
SDK Library API:C# PDF Page Insert Library: insert pages into PDF file in C#.net
Support to create new page to PDF document in both web server-side application and Windows Forms. Ability to add PDF page number in preview.
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SDK Library API:C# PDF Convert to Jpeg SDK: Convert PDF to JPEG images in C#.net
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fi
# never execute
if false; then
ls
fi
Inbothofthesecases,anexecutableisbeingrun—specifically,
/bin/true
and
/bin/false
.Anyexecutable
couldbeusedhere.
Areturnofzero(0)isconsideredtobetrue(success),andanyothervalueisconsideredtobefalse(failure).
Thus,iftheexecutablereturnszero(0),thecommandsfollowingthe
then
statementwillbeexecuted.Otherwise,
thestatementsfollowingthe
else
clause(ifoneexists)willbeexecuted.
Thereasonforthisseeminglybackwardsdefinitionof
true
and
false
isthatmostUNIXtoolsexitwithan
exitstatusofzerouponsuccessandanonzeroexitstatusonfailure,withpositivenumbersusuallyindicating
ausermistakeandnegativenumbersusuallyindicatingamoreseriousfailureofsomesort.Thus,youcan
easilytesttoseeifaprogramcompletedsuccessfullybyseeingiftheexitstatusisthesameasthatof
true
.
Onerelatedstatementthatyoushouldbefamiliarwithis
elif
.Thisstatementissimilartosaying
else if
exceptthatitdoesnotrequireanadditional
fi
attheendoftheconditional,andthusresultsinmorereadable
code.
Forexample:
#/bin/sh
read A
if [ "$A" = "foo" ] ; then
echo "Foo"
elif [ "$A" = "bar" ] ; then
echo "Bar"
else
echo "Other"
fi
Thisexamplereadsastringfromstandardinputandprintsoneofthreethings,dependingonwhetheryou
typed“foo”,“bar’,oranythingelse.(Thebracketsyntaxusedinthisexampleisexplainedinthenextsection,
ThetestCommandandBracketNotation (page 48).)
FlowControl,Expansion,andParsing
BasicControlStatements
2014-03-10   |   Copyright © 2003, 2014 Apple Inc. All Rights Reserved.
47
C Shell Note:  TheCshellsyntaxissimilartoC.Therearetwoforms:
#!/bin/csh
set A = "$<"
if ( "x${A}" == "xfoo" ) echo "Foo (single line)"
if ( "x${A}" == "xfoo" ) then
echo "Foo"
else if ( "x${A}" == "xbar" ) then
echo "Bar"
else
echo "Other"
endif
Notethatthe
echo
or
then
statementmustappearonthesamelineasthe
if
statement.Ifitdoes
not,yougetan“emptyif”errorandthescriptterminates.
ThetestCommandandBracketNotation
Whilethe
if
statementcanbeusedtorunanyexecutable,themostcommonuseofthe
if
statementisto
testwhethersomeconditionistrueorfalse,muchlikeyouwouldinaCprogramorotherprogramming
language.Forexample,the
if
statementiscommonlyusedtoseeiftwostringsareequal.
Becausethe
if
statementrunsacommand,inordertousethe
if
statementinthisfashion,youwillneeda
programtorunthatperformsthecomparisondesired.Fortunately,oneisbuiltintotheOS:
test
.(Formore
informationaboutusingothercommandswiththe
if
statement,seeWorkingwithResultCodes (page 70).)
The
test
executableisrarelyrundirectly,however.Generally,itisinvokedbyrunning
[
,whichisjustasymbolic
linkorhardlinkto
/bin/test
.
FlowControl,Expansion,andParsing
BasicControlStatements
2014-03-10   |   Copyright © 2003, 2014 Apple Inc. All Rights Reserved.
48
Note:  Althoughtheopenbracketisacommand,andthereisamanpage,youwillhaveahardtime
gettingtoitonthecommandline.Use:
man \\[
toseeit(orjustlookatthemanpagefor
test
).
Inthisform,thesyntaxofan
if
statementmorecloselyresemblesotherlanguages.Considerthefollowing
example:
#!/bin/sh
FIRST_ARGUMENT="$1"
if [ "$FIRST_ARGUMENT" = "Silly" ] ; then
echo "Silly human, scripts are for kiddies."
else
echo "Hello, world $FIRST_ARGUMENT!"
fi
Therearethreethingsyoushouldnotice.First,thespacebeforetheequalssigniscritical.Thisspaceisthe
differencebetweenassignment(nospace)andcomparison(space).Thespacesaroundthebracketsarealso
critical;failuretoincludethesespacesresultsinasyntaxerror.(Theopenbracketisreallyjustacommand,and
itexpectsitslastargumenttobeaclosebracketbyitself.)
Second,youshouldnoticetheuseofdoublequotemarks.Thisservestwopurposes.First,itensuresthateven
ifthevariableorstringisempty,thereisaplaceholder.Thisalsoensuresthatthecodewillfunctioncorrectly
ifthevariable’svaluecontainsspaces.
Ifyouarelookingatoldercode,youmayalsoseetheemptyvariableproblemsolvedinanotherway:
if [ x$VARIABLE = x ] ; then
echo "Empty variable \$VARIABLE"
fi
Inthisolderstyle,thetwoargumentstothecomparisonareprecededbyan‘x’(andinthisexample,onthe
rightside,the‘x’precedesnothing,thuscomparingthevaluetoanemptystring).
FlowControl,Expansion,andParsing
BasicControlStatements
2014-03-10   |   Copyright © 2003, 2014 Apple Inc. All Rights Reserved.
49
Thereasonthisisneededisbecausevariablesubstitutionoccursbeforethisstatementisexecuted.Ifyouomit
the‘x’ontheleftsideandthevaluein
$VARIABLE
isempty,thenthisstatementevaluatesto“
if [ = x ]
”,
whichisablatantsyntaxerror.
Thisstyleisnotrecommendedfornewcode.Itdoesnothandlespacesinsidevariables,andprovidesasignificant
attackvectorforarbitrarycodeinjection.SeeShellScriptSecurity (page 234)formoreinformation.
Note:  Thisexampleintroducesanotherspecialcharacter,thebackslash.Itisalsoknownasaquote
characterbecausethecharacterimmediatelyafteritistreatedasthoughitwerewithinquotes.Thus,
inthiscase,thesnippetprintsthenameofthevariable(
$VARIABLE
)ratherthanitscontents.The
useofbackslash(andothersimilarcharacters)isdescribedfurtherinQuotingSpecialCharacters (page
66).
The
test
commandcanalsobeusedforvariousothertests,includingthetestingfortheexistenceofafile,
basicnumericalcomparisons,checkingwhetherapathpointstoadirectory,anexecutable,orasymboliclink,
andsoon.Forexample,the
-d
flagcheckswhetheritsargumentisadirectory,asshowninthissnippet:
if [ -d "/System/Library/Frameworks" ] ; then
echo "/System/Library/Frameworks is a directory."
fi
Acompletelistofflagsandoperatorssupportedbythetestcommandcanbefoundinthemanpage
test
.
C Shell Note:  WhilethetestcommandcanbeusedintheCshell,itissomewhatunusualtodoso;
the
if
and
while
statementsintheCshelldonotuseitaspartoftheirnormalsyntax.
ThewhileStatement
Inadditiontothe
if
statement,theBourneshellalsosupportsa
while
statement.Itssyntaxissimilar.
while true; do
ls
done
Likethe
if
statement’s
then
and
fi
,thewhilestatementisbracketedby
do
and
done
.Muchlikethe
if
statement,thewhilestatementtakesasingleargumentthatcontainsacommandtoexecute.Theloop
terminateswhenthiscommand’sexitstatusisfalse(nonzero).
FlowControl,Expansion,andParsing
BasicControlStatements
2014-03-10   |   Copyright © 2003, 2014 Apple Inc. All Rights Reserved.
50
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