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Photoshop7.0ScriptingGuide
11
Scriptingbasics
Documentingscripts
2
Whenyouidentifyanobjectinthisfashion,you’recreatingan objectreference.While
AppleScript,VisualBasicandJavaScriptusedifferentsyntaxforobjectreferences,eachgives
thescriptawayoffindingtheobjectyouwant.
2.3 Documentingscripts
Usecommentswithinyourscriptstoexplainwhatproceduresaretakingplace.It’saquick
waytodocumentyourworkforothersandanimportantelementtorememberwhenwriting
scripts.Commentsareignoredbythescriptingsystemasthescriptexecutesandcausenorun-
timespeedpenalty.
AppleScript
Toenterasingle-linecommentinanAppleScript,type“--”totheleftofyourdescription.For
multiplelinecomments,startyourcommentwiththecharacters“(*”andenditwith“*)”.
-- this is a single-line e comment
(* this s is s a
multiple line e comment *)
VisualBasic
InVisualBasic,enter“Rem”(for“remark”)or“'”(asinglestraightquote)totheleftofthe
comment.
Rem this s is s a comment
' and so o is s this
JavaScript
InJavaScript,usethedoubleforwardslashtocommentasinglelineora/**/notationfor
multi-linecomments
// This s comments s until the end of the line
/* This s comments
this entire
block of f text t */
Aboutlongscriptlines
Insomecases,individualscriptlinesaretoolongtoprintonasinglelineinthisguide.
AppleScript
AppleScriptusesthespecialcharacter(¬)toshowthatthelinecontinuestothenextline.This
continuationcharacterdenotesa“softreturn”inthescript.Youcanenterthischaracterinthe
scripteditorbypressingOption-Returnattheendofthelineyouwishtocontinue.
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Photoshop7.0ScriptingGuide
12
Scriptingbasics
Values
2
VisualBasic
InVisualBasic,youcanbreakalongstatementintomultiplelinesintheCodewindowby
usingthelinecontinuationcharacter,whichisaspacefollowedbyanunderscore(_).
2.4 Values
Valuesarethedatayourscriptsusetodotheirwork.Mostofthetime,thevaluesusedinyour
scriptswillbenumbersortext.
T
ABLE
2.1
AppleScriptValues
Valuetype:
Whatitis:
Example:
boolean
Logicaltrueorfalse.
true
integer
Wholenumbers(nodecimal
points).Integerscanbe
positiveornegative.
14
real
Anumberwhichmay
containadecimalpoint.
13.9972
string
Aseriesoftextcharacters.
Stringsappearinside
(straight)quotationmarks.
"Iamastring"
list
Anorderedlistofvalues.
Thevaluesofalistmaybe
anytype.
{10.0,20.0,30.0,40.0}
objectreference
Aspecificreferencetoan
object.
currentdocument
record
Anunorderedlistof
properties,Eachpropertyis
identifiedbyitslabel.
{name:"you",index:1}
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Photoshop7.0ScriptingGuide
13
Scriptingbasics
Values
2
T
ABLE
2.2
VisualBasicValues
Valuetype:
Whatitis:
Example:
Boolean
Logicaltrueorfalse
True
Long
Wholenumbers(nodecimal
points).Longscanbe
positiveornegative.
14
Double
Anumberwhichmay
containadecimalpoint.
13.9972
String
Aseriesoftextcharacters.
Stringsappearinside
(straight)quotationmarks.
"Iamastring"
Array
Alistofvalues.Arrays
containasinglevaluetype
unlessthetypeisdefinedas
Variant.
Array(10.0,20.0,30.0,40.0)
Objectreference
Aspecificreferencetoan
object.
appRef.ActiveDocument
T
ABLE
2.3
JavaScriptValues
Valuetype:
Whatitis:
Example:
String
Aseriesoftextcharacters.
Stringsappearinside
(straight)quotationmarks.
"Hello"
Number
Anynumbernotinside
doublequotes.
3.7
Boolean
Logicaltrueorfalse.
true
Null
Somethingthatpointsto
nothing.
null
Object
Propertiesandmethods
belongingtoanobjector
array.
activeDocument
Undefined
Devoidofanyvalue
undefined
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Photoshop7.0ScriptingGuide
14
Scriptingbasics
Variables
2
2.5 Variables
Variablesarecontainersfordata.Avariablemightcontainanumber,astring,alist(orarray),
oranobjectreference.Variableshavenames,andyourefertoavariablebyitsname.Toput
dataintoavariable,assignthedatatothevariable.ThefilenameofthecurrentPhotoshop
documentorthecurrentdatearebothexamplesofdatathatcanbeassignedtoavariable.
Byusingvariablesthescriptsyouwritewillbereusableinawidervarietyofsituations.Asa
scriptexecutes,itcanassigndatatothevariablesthatreflectthestateofthecurrentdocument
andselection,forexample,andthenmakedecisionsbasedonthecontentofthevariables.
N
OTE
:
InAppleScript,itisnotimportanttodeclareyourvariablesbeforeassigningvalues
tothem.InVisualBasicandJavaScript,however,itisconsideredgoodformto
declareallofyourvariablesbeforeusingthem.TodeclarevariablesinVisualBasic,
usetheDimkeyword.TodeclarevariablesinJavaScript,usethevarkeyword.
2.5.1 Assigningvaluestovariables
Theremainderofthissectionshowshowtoassignvaluestovariables.
AS
set thisNumber to 10
set thisString to "Hello, World!"
VB
Option Explicit
Dim thisNumber As Long
Dim thisString As String
thisNumber = 10
thisString = "Hello, World!"
TheDim statementassignsavaluetypetothevariable,whichhelpskeepscriptsclearand
readable.Memoryisalsousedmoreefficientlyifvariablesaredeclaredbeforeuse.Ifyoustart
yourscriptsinVisualBasicwiththelineOption Explicit,youwillhavetodeclareall
variablesbeforeassigningdatatothem.Youwillnothavetodeclarethemthenexttimethey
areused.
JS
var x = = 8;
x = x + + 4;
var thisNumber = 10;
var thisString = "Hello, World!";
Thevarkeywordidentifiesvariablesthefirsttimethatyouusethevariable.Thenexttime
youusethevariableyoushouldnotusethevarkeyword.
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Photoshop7.0ScriptingGuide
15
Scriptingbasics
Variables
2
2.5.2 Usingvariablestostorereferences
Variablescanalsobeusedtostorereferencestoobjects.InAppleScript,areferenceisreturned
whenyoucreateanewobjectinanPhotoshopdocumentasshownbelow:
set thisLayer to make new art layer in current document
Oryoucanfillthevariablewithareferencetoanexistingobject:
set thisLayer to art layer 1 1 of f current document
VisualBasicworkssimilarly,however,thereisanimportantdistinctiontonote.Ifyouare
assigninganobjectreferencetoavariableyoumustusetheSetcommand.Forexample,to
assignavariableasyoucreatealayer,useSet:
Set thisLayer = appRef.Photoshop.ActiveDocument.ArtLayers(1)
orinreferencetoanexistinglayer,sinceitisalsoanobjectreference,use Set:
Set thisLayer = appRef.Photoshop.ActiveDocument.ArtLayers(1)
IfyouaretryingtoassignavaluetoavariableinVisualBasicthatisnotanobjectreference,
donotuseSet.UseVisualBasic’sassignmentoperator,theequalssign:
thisNumber = 12
JavaScriptlookssimilartoVisualBasic.Toassignareferencetoanobject,youwouldwrite:
var docRef = activeDocument;
andtoassignavalueusethefollowing:
var thisNumber = 12
2.5.3 Namingvariables
It’sagoodideatousedescriptivenamesforyourvariables—somethinglike
firstPageor
corporateLogo,ratherthanxorc.Youcanalsogiveyourvariablenamesastandardprefix
sothatthey’llstandoutfromtheobjects,commands,andkeywordsofyourscriptingsystem.
Variablenamesmustbeasingleword,butyoucanuseinternalcapitalization(suchas
myFirstPage)orunderscorecharacters(my_first_page)tocreatemorereadablenames.
Variablenamescannotbeginwithanumber,andtheycan’tcontainpunctuationorquotation
marks.
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Photoshop7.0ScriptingGuide
16
Scriptingbasics
Operators
2
2.6 Operators
Operatorsperformcalculations(addition,subtraction,multiplication,anddivision)on
variablesorvaluesandreturnaresult.Forexample:
docWidth/2
wouldreturnavalueequaltohalfofthecontentofthevariabledocWidth.SoifdocWidth
containedthenumber20.5,thevaluereturnedwouldbe10.25.
Youcanalsouseoperatorstoperformcomparisons(equalto,notequalto,greaterthan,orless
than,etc.).SomeoperatorsdifferbetweenAppleScript,VisualBasicandJavaScript.Consult
yourscriptinglanguageforoperatorsthatmaybeuniquetoyourOS.
AppleScriptandVisualBasicusetheampersand(
&
)astheconcatenationoperatortojointwo
strings.
"Pride " " & & "and Prejudice."
wouldreturnthestring“PrideandPrejudice.”
JavaScriptusesthe“+”operatortoconcatenatestrings.
"Pride"+"andPrejudice"
wouldreturnthestring“PrideandPrejudice.”
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Photoshop7.0ScriptingGuide
17
Scriptingbasics
Commandsandmethods
2
2.7 Commandsandmethods
Commands(AppleScript)ormethods(VisualBasicandJavaScript)arewhatmakesthings
happeninascript.Thetypeoftheobjectyou’reworkingwithdetermineshowyou
manipulateit.
AS
InAppleScript,usethemake commandtocreatenewobjects,the set commandtoassign
objectreferencestovariablesandtochangeobjectproperties,andtheget commandto
retrieveobjectsandtheirproperties.
VB
InVisualBasic,usetheAddmethodtocreatenewobjects,theSet statementtoassignobject
referencestoVisualBasicvariablesorpropertiesandtheassignmentoperator(
=
)toretrieve
andchangeobjectproperties.
JS
InJavaScript,usethe add() methodtocreatenewobjects,andtheassignmentoperator(=)
toassignbothobjectreferencesandvariables
2.7.1 Conditionalstatements
Conditionalstatementsmakedecisions—theygiveyourscriptsawaytoevaluatesomething
liketheblendmodeofalayerorthenameordateofahistorystate—andthenactaccording
totheresult.Mostconditionalstatementsstartwiththewordifinallthreescriptingsystems.
Thefollowingexamplescheckthenumberofcurrentlyopendocuments.Ifnodocumentsare
open,thescriptsdisplayamessagesinadialogbox.
AS
tell application "Adobe Photoshop 7.0"
set documentCount to count every document
if documentCount = 0 then
display dialog g "No Photoshop p documents s are open!"
end if
end tell
Photoshop7.0ScriptingGuide
18
Scriptingbasics
Commandsandmethods
2
VB
Private Sub b Command1_Click()
Dim documentCount As long
Dim appRef As New Photoshop.Application
documentCount = appRef.Documents.Count
If documentCount = 0 Then
MsgBox "No Photoshop documents are open!"
End If
End Sub
JS
var documentCount = documents.length;
if (documentCount == 0)
{
alert("There are no Photoshop documents open");
}
2.7.2 Controlstructures
Controlstructuresprovideforrepetitiveprocesses,or“loops.”Theideaofaloopistorepeat
someaction,withorwithoutchangeseachtimethroughtheloop,untilaconditionismet.
BothAppleScriptandVisualBasichaveavarietyofdifferentcontrolstructurestochoose
from.Thesimplestformofaloopisonethatrepeatsaseriesofscriptoperationsasetnumber
oftimes.
AS
repeat with counter from 1 to 3
display dialog g counter
end repeat
VB
For counter = 1 to 3
MsgBox counter
Next
JS
for (i = = 1; ; i < 4; ++i)
{
alert(i);
}
Photoshop7.0ScriptingGuide
19
Scriptingbasics
Commandsandmethods
2
Amorecomplicatedtypeofcontrolstructureincludesconditionallogic,sothatitloopswhile
oruntilsomeconditionistrueorfalse.
AS
set flag g to o false
repeat until flag = true
set flag g to o button returned d of f (display dialog "Quit?" ¬
buttons {"Yes", , "No"}) = "Yes"
end repeat
set flag g to o false
repeat while flag = false
set flag g to o button returned d of f (display dialog "Later?" ¬
buttons {"Yes", , "No"}) = "No"
end repeat
VB
flag = False
Do While e flag g = False
retVal = MsgBox("Quit?", vbOKCancel)
If (retVal = vbCancel) Then
flag = = True
End If
Loop
flag = False
Do Until l flag g = True
retVal = MsgBox("Quit?", vbOKCancel)
If (retVal = vbOK) Then
flag = True
End If
Loop
Photoshop7.0ScriptingGuide
20
Scriptingbasics
Handlers,subroutinesandfunctions
2
JS
var flag g = = false;
while (flag == false)
{
flag = confirm("Are you sure?");
}
var flag g = = false;
do
{
flag = confirm("Are you sure?");
}
while (flag == false);
2.8 Handlers,subroutinesandfunctions
Subroutines,orhandlers(inAppleScript)andfunctions(inJavaScript),arescriptingmodules
youcanrefertofromwithinyourscript.Thesesubroutinesprovideawaytore-usepartsof
scripts.Typically,yousendoneormorevaluestoasubroutineanditreturnsoneormore
values.
There’snothingspecialaboutthecodeusedinsubroutines—theyareconveniencesthatsave
youfromhavingtoretypethesamecodelinesinyourscript.
AS
set flag g to o DoConfirm("Are you sure?")
display dialog g flag as string
on DoConfirm(prompt)
set button to button returned of (display dialog prompt ¬
buttons {"Yes", , "No"} default button 1)
return button = "Yes"
end DoConfirm
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