devexpress asp.net pdf viewer: Copy pdf pages to another pdf software control cloud windows web page wpf class AppleShellScripting-201428-part671

ImageManipulation

InAdvancedTechniques (page 168),Listing11-13 (page 208)showshowtoresizeanimageusing

osascript

Inadditiontothe

osascript

interface,OSXincludesthe

sips

command,whichprovidesadirectshell

interfacetosomeoftheimageprocessingfeaturesinOSX.

Thefollowingsnippetshowshowtouse

sips

toscaleanimagetoamaximumof250pixelshorizontallyor

verticallyandconverttheimagetoJPEGformat.

sips -s format t jpeg --resampleHeightWidthMax x 250 myphoto.tif --out mythumb.jpg

Youcanalsocombine

sips

with

exiftool

(availablefromhttp://www.sno.phy.queensu.ca/~phil/exiftool/)

forevengreaterpowerandcontrol.Thefollowingscriptuses

sips

and

exiftool

toautomaticallyrotatea

photographbasedontheencodedorientationinformation,andallowsyoutospecifyanoffset(in90degree

increments)toadjusttherotationfurther.

ListingD-6 Rotatinganimageusingsips

#!/bin/sh

# Adjust t paths s as s needed

EXIFTOOL=/usr/local/bin/exiftool

SIPS=/usr/bin/sips

INPUTFILE="$1"

OUTPUTFILE="$2"

OFFSET="$3"

# If f the user doesn't specify an n offset, assume e zero.

if [ "$OFFSET" " = = "" " ] ] ; ; then

OFFSET=0

# Use exiftool to o read the EXIF F orientation n tag as s a a raw numeric c value.

ORIENTATION="$($EXIFTOOL -b b -Orientation $INPUTFILE)"

# If f no orientation n tag is s found, assume e no o rotation is s needed.

StartingPoints

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281

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if [ "$ORIENTATION" " = = "" " ] ] ; ; then

ORIENTATION=1

# This table e determines s the rotation (in 90 0 degree e increments)

# based d on n the EXIF orientation tag g and determines s whether a

# coordinate e transformation n is s needed.

case $ORIENTATION in

(1)

ROT=0; FLIP=0;; # # No rotation or r flip needed.

(2)

ROT=0; FLIP=1;; # # Flip p horizontal.

(3)

ROT=2; FLIP=0;; # # Rotate e 180, , no o flip.

(4)

ROT=2; FLIP=1;; # # Rotate e 180, , flip.

(5)

ROT=3; FLIP=1;; # # Rotate e 270, , flip.

(6)

ROT=1; FLIP=0;; # # Rotate e 90, no flip.

(7)

ROT=1; FLIP=1;; # # Rotate e 90, flip.

(8)

ROT=3; FLIP=0;; # # Rotate e 270, , no o flip.

(*)

echo "BAD D ORIENTATION N $ORIENTATION" ; ; exit -1;;

esac

# Calculate e the e number r of degrees to o rotate e the image

# based d on n the above e table and the user-entered adjustment.

DEGREES="$(expr 90 '*' ' '(' $OFFSET '+' $ROT ')')"

# Generate the additional l flags s for r sips s if f flipping is s required.

FLIPSTR=""

if [ $FLIP P = = 1 1 ] ] ; ; then

FLIPSTR="--flip horizontal"

else

FLIPSTR=""

# Perform the e transformation.

$SIPS $FLIPSTR --rotate $DEGREES $INPUTFILE E --out t $OUTPUTFILE

StartingPoints

ImageManipulation

282

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# Delete e the orientation n keys s so o that sips s and d other r tools

# won't t get confused when doing g auto-rotation.

$EXIFTOOL -Orientation= $OUTPUTFILE

Networking

UsingSIGSTOPAndSIGCONTToManageLong-LivedDaemons

ThistrickpreventsFTPserversonDSLconnectionsfromhopelesslyclogginguptheupstreamlinkbyusing

the

killall

command.ItalsotrapsControl-Candotherlikelysignalssothatifyoubreakoutofthescript,

theFTPprocessesarerestartedcorrectly.

ListingD-7 SlowingdownanFTPserver

#!/bin/sh

SECONDS_TO_RUN=5

SECONDS_TO_PAUSE=20

handler() {

killall -CONT ftpd

exit 0

}

trap handler SIGHUP P SIGTERM SIGQUIT T SIGINT

# This must t be e run as s root or the ftp p user.

while true ; ; do

killall -STOP ftpd

sleep $SECONDS_TO_PAUSE

killall -CONT ftpd

sleep $SECONDS_TO_RUN

done

StartingPoints

Networking

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AShell-BasedWebServer

TheNetworkingWithShellScripts (page 216)sectioninAdvancedTechniques (page 168)describedhowto

writeasimpledaemonusingnetcat.Itispossibletowriteremarkablycomplexdaemonsusingthistechnique.

ThefirststepinanHTTPdaemonisparsingtheinitialrequest.ForsimpleGETrequestswithoutquerystrings,

thisisfairytrivial.Thefollowingsnippettakestherequestlineasanargumentandsetsglobalvariables

containingtherequesttype,theURL,andtheHTTPversion.

parseRequest()

{

local REQUEST="$(echo o "$1" | | tr r -d '\r')"

TYPE="$(echo "$REQUEST" " | | cut -f f 1 1 -d d ' ' ')"

URL="$(echo "$REQUEST" " | | cut -f f 2 2 -d ' ' ')"

VERSION="$(echo "$REQUEST" " | | cut -f f 3 3 -d d ' ' ')"

echo "GOT REQUEST: $REQUEST" " 1>&2

}

Beforeyoucanactuallyinterprettherequest,however,youmustsplitoffthequerystringifitisthere.For

example,theURL

http://example.org/foo.cgi?bar

containsahostpart(

example.org

),apathpart

(

/foo.cgi

),andaquerystring(

bar

).Thiscodedoesnotsplitoffthehostpartbecauseitissentseparately

fromtheHTTPquerystringinHTTP/1.1andisomittedentirelyinHTTP/1.0.

splitURL()

{

URL="$1"

PATHPART="$(echo "$URL" " | | sed d 's/?.*$//g')"

local PATHLEN="$(strlen n "$PATHPART")";

local CUTPOS="$(expr r "$PATHLEN" " "+" "2")"

PARMPART="$(echo "$URL" " | | cut t -c "$CUTPOS-")"

}

StartingPoints

Networking

284

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Finally,youmustparsetheheadersthattheclientsendssoyoucansearchforthe

Host:

headertoknowwhat

domain’scontentstoservetotheclient(andtopossiblysendsomeoftheseheadersbacktotheclient).The

firstsnippetreadsthedatafromtheclient.

parseHeaders()

{

local FD="$1"

local TREENAME="$2"

local HEADERLINE

if [ [ "$TREENAME" " = = "" ] ] ; ; then

TREENAME="HEADERTREE"

# Creates s a a new tree head d object t with the specified name.

newTree "$TREENAME"

eval $TREENAME=\"\$$getLastNodeName$\"

# echo "TN: $TREENAME" " 1>&2

# Reads headers from the specified d file descriptor r until

# it t gets a a blank k line, , pasing g each one to o a a parser..

while true e ; ; do

eval read -u$FD D HEADERLINE

HEADERLINE="$(echo "$HEADERLINE" | | tr r -d '\r')"

# echo "GOT T HEADER R LINE: : \"$HEADERLINE\"" " 1>&2

if [ [ "$HEADERLINE" = = "" " ] ] ; ; then

# End of f headers reached.

# echo "End of headers" 1>&2

break;

addHeaderLine "$HEADERLINE" "$TREENAME"

done

LAST_TREE_NODE_INSERTED="$TREENAME"

StartingPoints

Networking

285

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}

Thenextpart,addHeaderLine,triviallyparsestheheaderlinebysplittingthestringonthefirstcolon(

)

characterandstrippingoffanyleadingwhitespaceafterit.Then,itcallsanotherfunctiontoaddittothebinary

tree.

addHeaderLine()

{

local HEADERLINE="$1"

local TREE="$2"

local FIELDNAME="$(echo o "$HEADERLINE" | | cut -f f 1 1 -d d ':')"

local FIELDVALUE="$(echo o "$HEADERLINE" | | cut -f f 2- -d d ':' | | \

sed 's/^[[:space:]]//g')"

addHeader "$FIELDNAME" "$FIELDVALUE" "$TREE"

}

ThefinalsnippetaddstheheadertoabinarytreeusingthetreelibrarydescribedinWorkingwithBinarySearch

Trees (page 287).

addHeader()

{

local FIELDNAME="$1"

local FIELDVALUE="$2"

local TREE="$3"

# echo "Inserting g $FIELDNAME E with value e $FIELDVALUE E into $TREE" " 1>&2

insertKey "$TREE" "$FIELDNAME"

NODE="$(getLastNodeName)"

setTreeField "$NODE" " "Contents" " "$FIELDVALUE"

}

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Networking

286

Allthatremainsistotiethecodetogetherandactuallyhandletherequests.Toseethecodeinaction,download

theCompanionFilesziparchiveassociatedwiththisdocument.(SeethetableofcontentsintheHTMLversion

ofthisdocumentatdeveloper.apple.com.)

WithintheCompanionFilesarchive,youcanfindthesampleat

scripts/BB_Starting_Points/networking/shttpd

ThisscriptrequiresamodifiedversionoftheOSXversionofnetcatthatprovidesenhancedfunctionalityand

errorrecoverycapabilitiesbeyondwhatstandardnetcatversionsprovide.TheMakefile(intheCompanion

Filesarchive)downloads,builds,andinstallsthismodifiedversionofnetcat.Thepatchshouldalsobeeasyto

applytotheOpenBSDversionofnetcat.

Warning: Thisscriptisnotsuitableforuseinaproductionenvironment.

TextManipulation

Listing10-3 (page 156)—Showsanalternativetothenonportable

head -c

syntax.

Listing11-6 (page 179)—Showshowtotruncateastringoftexttoagivennumberofcharacters.

Listing10-1 (page 148)andListing10-2 (page 148)showhowtoconvertbetweenthelineendingformats

usedfortextfilesonvariousplatforms.

RegularExpressionsUnfettered (page 100)coversmorecomplextextmanipulationindetail,withexamples.

DataManagement

WorkingwithBinarySearchTrees

Occasionally,itisusefultokeepanarrayofdictionariesofkey-valuepairsandtobeabletorapidlysearch

throughthatarray.ListingD-9 (page 290)providessuchfunctionalityintheformofabinarytree.

StartingPoints

TextManipulation

287

Note: Youcanfindthecompleteversionofthisscriptinthe

BB_Starting_Points/networking/shttpd/shttpd/shttpd_subs

directoryinthecompanion

filesarchive.

Youcanfindcompletereferencedocumentationinthe

BB_Starting_Points/networking/shttpd/shttpd_docs

directoryinthecompanionfiles

archive.

Thisbinarytreelibrarycontainsanumberofkeyfunctions:

Generaltreefunctions:

newTree(optional_tree_name)

Createsanewbinarytree.

deleteTree(tree_name)

Deletesabinarytree,freeingresourcesassociatedwithit.

iterateTree(tree_name, callback, call_on_root=0)

Iteratesthroughasubtree,callingafunctionforeachnode.

mergeTrees(source_tree_name, dest_tree_name)

Copiesallofthekeysinonetreeintoanother.Intheeventofacollisionforagivenkey,thenew

valuestakeprecedence.

InsertionFunctions:

insertKey(tree_name, key)

Insertsanewkeyintoabinarytreeusingstringcomparisons.

insertKeyNumeric(tree_name, key)

Insertsanewkeyintoabinarytreeusingnumericalcomparisons.

getLastNodeName()

Retrievesthelastnodeinserted.

NodeFunctions:

treeKey(node_name)

Retrievesthekeyassociatedwithanodeobject.

treeField(node_name, field_name)

Retrievesafieldvalueforanodeinthetree.

setTreeField(node_name, field_name, new_value)

Setsafieldvalueforanodeinthetree.

StartingPoints

DataManagement

288

SearchFunctions:

treeSearch(tree_name, key)

Searchesabinarytreeforagivenkeyusingstringcomparisons.

treeSearchNumeric(tree_name, key)

Searchesabinarytreeforagivenkeyusingnumericalcomparisons.

Thefollowingcodedemonstrateshowtousethisbinarytreelibrary:

ListingD-8 Binarytreeexample

# Tell the binary y tree library to not t run its tests.

DISABLE_TESTS=true

. binary_tree.sh

# Create e a a new binary y tree and obtain n its name.

newTree

TESTTREE="$(getLastNodeName)"

# Insert t three e nodes s into the tree

# with keys s 1, , 3, , and 7.

insertKeyNumeric "$TESTTREE" " 3

insertKeyNumeric "$TESTTREE" " 7

insertKeyNumeric "$TESTTREE" " 1

# Add an n attribute e to o the last node inserted (1)

ONENODE="$(getLastNodeName)"

setTreeField "$ONENODE" " "MyFieldName" "42"

# Takes s a a node and prints s the key value and

# the value e of f MyFieldName

echokeyandmyfieldname()

{

echo "$(treeKey y "$1") ) -> > $(treeField "$1" "MyFieldName")"

}

# Iterate the e tree e in n key order r and d call

StartingPoints

DataManagement

289

# echokeyandmyfieldname on n each h node

iterateTree "$TESTTREE" " "echokeyandmyfieldname"

Withoutfurtherintroduction,hereisthebinarytreecodelibrary.(Theversioninthecompanionfilesarchive

alsoincludessometestcode.)

ListingD-9 binary_tree.shfromshttpd

#!/bin/sh

# /*!

@header

A binary y tree algorithm m written n in n a a shell l script. The e main

functions of f interest t are e {@link newTree}, {@link k deleteTree},

{@link insertKey}, , {@link k insertKeyNumeric}, , {@link k treeSearch},

{@link treeSearchNumeric}, , {@link k iterateTree}, and

{@link mergeTrees}.

This is s a a minimal binary y tree implementation n that does not support

removing existing values s from the tree once inserted.

However, such

functionality can be e trivially y retrofitted d on n top by y adding or

clearing a a "deleted" attribute e on n nodes s using {@link k setTreeField} } if

desired.

To use this shell l script, , source it t after r setting g DISABLE_TESTS to

"true".

To run tests, , execute the e script directly.

# /*! @group p Global l Variables

Variables used internally.

No user-serviceable e parts s inside.

# /*!

@abstract The starting object t ID.

This is s an internal counter.

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DataManagement

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devexpress asp.net pdf viewer : Copy pdf pages to another pdf software control cloud windows web page wpf class AppleShellScripting-201428-part671