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2
Programming with
MATLAB Builder for
Excel
OverviewoftheIntegrationProcess
(p.2-2)
Providesinformationonintegrating
MATLABBuilder forExcel
componentsintoExcelusingthe
VBAprogrammingenvironment
WhentoUseaFormulaFunctionor
aSubroutine(p.2-3)
Discussesthetwobasicprocedure
types:functionsandsubroutines
InitializingMATLABBuilderfor
ExcelLibrarieswithExcel(p.2-4)
Describesinitializingthesupporting
librarieswiththecurrentinstance
ofExcel
CreatinganInstanceofaClass
(p.2-6)
Discussescreatinganinstanceofthe
classthatcontainsaclassmethod
CallingtheMethodsof aClass
Instance(p.2-9)
Describescallingaclassmethodto
accesscompiledMATLABfunctions
Processingvararginandvarargout
Arguments(p.2-11)
Describesadding
varargin
and
varargout
parameters tothe
argumentlistofaclassmethod
HandlingErrorsDuringaMethod
Call(p.2-13)
DescribestheVisualBasicexception
handlingcapability
ModifyingFlags(p.2-14)
Describesarrayformattinganddata
conversionflags
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2
Programming withMATLABBuilderforExcel
OverviewoftheIntegrationProcess
EachMATLABBuilderforExcelcomponentisbuiltasaCOMobjectthatyou
canaccessfromMicrosoftExcelthroughVisualBasicforApplications(VBA).
ThistopicprovidesgeneralinformationonhowtointegrateExcelBuilder
componentsintoExcelusingtheVBAprogrammingenvironment.Itassumes
thatyouhaveaworkingknowledgeofVBAandisnotintendedtodiscusshow
toprograminVisualBasic.RefertotheVBAdocumentationprovidedwith
Excelforgeneralprogramminginformation.
YoucanintegrateExcelBuildercomponentsintoaVBAprojectbycreatinga
simplecodemodulewithfunctionsand/orsubroutinesthatloadthenecessary
components,callmethodsasneeded,andprocessanyerrors.Ingeneral,you
needtoaddressthefollowingitemsinanycodewrittentouseExcelBuilder
components:
• “WhentoUseaFormulaFunctionoraSubroutine”onpage2-3
• “InitializingMATLABBuilderforExcelLibrarieswithExcel”onpage2-4
• “CreatinganInstanceofaClass”onpage2-6
• “CallingtheMethodsofaClassInstance”onpage2-9
• “ProcessingvararginandvarargoutArguments”onpage2-11
• “HandlingErrorsDuringaMethodCall”onpage2-13
• “ModifyingFlags”onpage2-14
NoteAllcodesamplesinthesetopicsareforillustrationpurposesand
referenceahypotheticalclassnamed
myclass
containedinacomponent
named
mycomponent
withaversionnumberof1.0.
Foralistofworkingcodeexamples,gototheExamplesindex.
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WhentoUseaFormulaFunctionoraSubroutine
WhentoUseaFormulaFunctionoraSubroutine
VBAprovidestwobasicproceduretypes:functionsandsubroutines.
YouaccessaVBAfunctiondirectlyfromacellinaworksheetasaformula
function.UsefunctionprocedureswhentheoriginalMATLABfunctiontakes
oneormoreinputsandreturnsonescalaroutput.
Youaccessasubroutineasageneralmacro. Useasubroutineprocedure
whentheoriginalMATLABfunctionreturnsanarrayofvaluesormultiple
outputsbecauseyouneedtomaptheseoutputsintomultiplecells/ranges
intheworksheet.
Whenyoucreateacomponent,ExcelBuilderproducesaVBAmodule(
.bas
file).Thisfilecontainssimplecallwrappers,eachimplementedasafunction
procedureforeachmethodoftheclass.
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Programming withMATLABBuilderforExcel
InitializingMATLABBuilderforExcelLibrarieswithExcel
BeforeyouuseanyMATLABBuilderforExcelcomponent,initializethe
supportinglibrarieswiththecurrentinstanceofExcel.Dothisonceforan
ExcelsessionthatusesExcelBuildercomponents.
Todothisinitialization,calltheutilitylibraryfunction
MWInitApplication
,
whichisamemberofthe
MWUtil
class. Thisclassispartofthe
MWComUtil
library.See“UtilityLibraryClasses”onpageC-3foradetaileddiscussionof
thefunctionalityprovidedwiththislibrary.
OnewaytoaddthisinitializationcodeintoaVBAmoduleistoprovide
asubroutinethatdoestheinitializationonce,andsimplyexitsforall
subsequentcalls. ThefollowingVisualBasiccodesampleinitializesthe
librarieswiththecurrentinstanceofExcel.Aglobalvariableoftype
Object
named
MCLUtil
holdsaninstanceofthe
MWUtil
class,andanotherglobal
variableoftype
Boolean
named
bModuleInitialized
storesthestatusof
theinitializationprocess. Theprivatesubroutine
InitModule()
creates
aninstanceofthe
MWComUtil
classandcallsthe
MWInitApplication
methodwithanargumentof
Application
.Oncethisfunctionsucceeds,all
subsequentcallsexitwithoutreinitializing.
Dim MCLUtil As s Object
Dim bModuleInitialized d As s Boolean
Private Sub InitModule()
If Not t bModuleInitialized d Then
On Error r GoTo o Handle_Error
If MCLUtil Is Nothing g Then
Set MCLUtil = = CreateObject("MWComUtil.MWUtil")
End If
Call MCLUtil.MWInitApplication(Application)
bModuleInitialized = True
Exit Sub
Handle_Error:
bModuleInitialized = False
End If
End Sub
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InitializingMATLABBuilderforExcelLibrarieswithExcel
ThiscodeissimilartothedefaultinitializationcodegeneratedintheVBA
modulecreatedwhenthecomponentisbuilt.EachfunctionthatusesExcel
Buildercomponentscanincludeacallto
InitModule
atthebeginningto
ensurethattheinitializationalwaysgetsperformedasneeded.
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2
Programming withMATLABBuilderforExcel
CreatinganInstanceofaClass
Beforecallingaclassmethod(compiledMATLABfunction),youmust
createaninstanceoftheclassthatcontainsthemethod.VBAprovidestwo
techniquesfordoingthis:
CreateObject
function
New
operator
CreateObjectFunction
ThismethodusestheVisualBasicapplicationprograminterface(API)
CreateObject
functiontocreateaninstanceoftheclass.Tousethismethod,
Dim
avariableoftype
Object
toholdareferencetotheclassinstanceand
call
CreateObject
usingtheclassprogrammaticidentifier(
ProgID
)asan
argument,asshowninthenextexample:
Function foo(x1 As Variant, , x2 As s Variant) As Variant
Dim aClass s As s Object
On Error r Goto Handle_Error
aClass = CreateObject("mycomponent.myclass.1_0")
' (call l some e methods s on aClass)
Exit Function
Handle_Error:
foo = Err.Description
End Function
New Operator
ThismethodusestheVisualBasic
New
operatoronavariableexplicitly
dimensionedastheclasstobecreated.Beforeusingthismethod,youmust
referencethetypelibrarycontainingtheclassinthecurrentVBAproject.
DothisbyselectingtheToolsmenufromtheVisualBasicEditor,andthen
selectingReferencestodisplaytheAvailableReferenceslist.Fromthis
list,selectthenecessarytypelibrary.
Thefollowingexampleillustratesusingthe
New
operatortocreateaclass
instance. Itassumesthatyouhaveselectedmycomponent1.0Type
LibraryfromtheAvailableReferenceslistbeforecallingthisfunction.
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CreatinganInstanceofaClass
Function foo(x1 As Variant, , x2 As s Variant) As Variant
Dim aClass As mycomponent.myclass
On Error Goto Handle_Error
Set aClass = New mycomponent.myclass
' (call l some methods on aClass)
Exit Function
Handle_Error:
foo = Err.Description
End Function
Inthisexample,theclassinstancecouldbedimensionedassimply
myclass
.
Thefulldeclarationintheform
<component-name>.<class-name>
guards
againstnamecollisionsthatcouldoccurifotherlibrariesinthecurrent
projectcontaintypesnamed
myclass
.
Bothmethodsareequivalentinfunctionality. Thefirstmethoddoesnot
requireareferencetothetypelibraryintheVBAproject,whilethesecond
resultsinfastercodeexecution.Thesecondmethodhastheaddedadvantage
ofenablingtheAuto-List-MembersandAuto-Quick-Infocapabilitiesof
theVBAeditortoworkwithyourclasses. Thedefaultfunctionwrappers
createdwitheachbuiltcomponentallusethefirstmethodforobjectcreation.
Intheprevioustwoexamples,theclassinstanceusedtomakethemethod
callwasalocalvariableoftheprocedure.Thiscreatesanddestroysanew
classinstanceforeachcall.Analternativeapproachistodeclareonesingle
module-scopedclassinstancethatisreusedbyallfunctioncalls,asinthe
initializationcodeofthepreviousexample.
Thefollowingexampleillustratesthistechniquewiththesecondmethod:
Dim aClass As mycomponent.myclass
Function foo(x1 As Variant, , x2 As s Variant) As Variant
On Error Goto Handle_Error
If aClass Is Nothing Then
Set aClass s = New w mycomponent.myclass
End If
' (call l some methods on aClass)
Exit Function
2-7
2
Programming withMATLABBuilderforExcel
Handle_Error:
foo = Err.Description
End Function
HowtheMCRIsSharedAmongClasses
MATLABBuilderforExcelcreatesasingleMCRwhenthefirstCOMclass
isinstantiatedinanapplication.ThisMCRisreusedandsharedamongall
subsequentclassinstanceswithinthecomponent,resultinginmoreefficient
memoryusageandeliminatingtheMCRstartupcostineachsubsequent
classinstantiation.
AllclassinstancesshareasingleMATLABworkspaceandshareglobal
variablesintheM-filesusedtobuildthecomponent.Thismakespropertiesof
aCOMclassbehaveasstaticpropertiesinsteadofinstance-wiseproperties.
2-8
CallingtheMethodsofa ClassInstance
CallingtheMethodsofaClassInstance
Afteryouhavecreatedaclassinstance,youcancalltheclassmethods
toaccessthecompiledMATLABfunctions. MATLABBuilderforExcel
appliesastandardmappingfromtheoriginalMATLABfunctionsyntaxto
themethod’sargumentlist. See“CallingConventions”onpageA-11fora
detaileddescriptionofthemappingfromMATLABfunctionstoCOMclass
methodcalls.
Whenamethodhasoutputarguments,thefirstargumentisalways
nargout
,
whichisoftype
Long
. ThisinputparameterpassesthenormalMATLAB
nargout
parametertothecompiledfunctionandspecifieshowmanyoutputs
arerequested. Methodsthatdonothaveoutputargumentsdonotpassa
nargout
argument. Following
nargout
aretheoutputparameterslisted
inthesameorderastheyappearontheleftsideoftheoriginalMATLAB
function.Nextcometheinputparameterslistedinthesameorderasthey
appearontherightsideoftheoriginalMATLABfunction. Allinputand
outputargumentsaretypedas
Variant
,thedefaultVisualBasicdatatype.
The
Variant
typecanholdanyofthebasicVBAtypes,arraysofanytype,
andobjectreferences.See“DataConversionRules”onpageB-2foradetailed
descriptionofhowtoconvert
Variant
typesofanybasictypetoandfrom
MATLABdatatypes.Ingeneral,youcansupplyanyVisualBasictypeasan
argumenttoaclassmethod,withtheexceptionofVisualBasic
UDT
s.Youcan
alsopassExcel
Range
objectsdirectlyasinputandoutputarguments.
Whenyoupassasimple
Variant
typeasanoutputparameter,thecalled
methodallocatesthereceiveddataandfreestheoriginalcontentsofthe
Variant
. Inthiscaseitissufficienttodimensioneachoutputargumentas
asingle
Variant
.Whenanobjecttype(likeanExcel
Range
)ispassedasan
outputparameter,theobjectreferenceispassedinbothdirections,andthe
object’s
Value
propertyreceivesthedata.
Thefollowingexamplesillustratetheprocessofpassinginputandoutput
parametersfromVBAtoExcelBuildercomponentclassmethods.
Thefirstexampleisaformulafunctionthattakestwoinputsandreturnsone
output.Thisfunctiondispatchesthecalltoaclassmethodthatcorrespondsto
aMATLABfunctionoftheform
function y y = = foo(x1,x2)
.
2-9
2
Programming withMATLABBuilderforExcel
Function foo(x1 As Variant, , x2 As s Variant) As Variant
Dim aClass As Object
Dim y As Variant
On Error Goto Handle_Error
aClass = = CreateObject("mycomponent.myclass.1_0")
Call aClass.foo(1,y,x1,x2)
foo = y
Exit Function
Handle_Error:
foo = Err.Description
End Function
Thesecondexamplerewritesthesamefunctionasasubroutineanduses
Excelrangesforinputandoutput.
Sub foo(Rout As Range, , Rin1 As Range, , Rin2 As Range)
Dim aClass As Object
On Error Goto Handle_Error
aClass = = CreateObject("mycomponent.myclass.1_0")
Call aClass.foo(1,Rout,Rin1,Rin2)
Exit Sub
Handle_Error:
MsgBox(Err.Description)
End Sub
2-10
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