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A
Producing a COM Object
from MATLAB
OverviewofInternalProcesses
(p.A-2)
Providesahigh-leveldescriptionof
internalprocesses
ComponentRegistration(p.A-5)
Describestheregistrationprocess
forMATLABBuilderforExcel
components
CallingConventions(p.A-11)
Describescallingconventionsand
M-filemappings
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A
ProducingaCOMObjectfromMATLAB
OverviewofInternalProcesses
MATLABBuilderforExcelletsyoupassMicrosoftExcelworksheetvalues
toacompiledMATLABmodelviaVBA,andreturnmodeloutputtoacell
orrangeofcellsintheworksheet.
EachExcelBuildercomponentisbuiltasastand-aloneCOMobject.Each
MATLABfunctionincludedinagivencomponentappearsasamethodof
thecreatedCOMclass.TheresultingcallsyntaxfromVBissystematically
mappedtothesyntaxoftheoriginalMATLAB.Thismappingprovidesa
bridgefromMATLAB,wherethefunctionsarecreated,toVB,wherethe
functionsareultimatelycalled.
Thefollowingconceptualdiagramillustratestheprocess:
A-2
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OverviewofInternalProcesses
TheprocessofcreatinganExcelBuildercomponentiscompletelyautomatic
fromauserpointofview.YouspecifyalistofM-filestoprocessandafew
additionalpiecesofinformation,suchasthecomponentname,theclass
names,andtheversionnumber. Thebuildprocessinvolvesthefollowing
steps:
1
“CodeGeneration”onpageA-3
2
“InterfaceDefinitionCreation”onpageA-3
3
“C++Compilation”onpageA-4
4
“LinkingandResourceBinding”onpageA-4
5
“ComponentRegistration”onpageA-4
Code Generation
Thefirststepinthebuildprocessgeneratesallsourcecodeandother
supportingfilesneededtocreatethecomponent. Italsocreatesthemain
sourcefile(
mycomponent_dll.cpp
)containingtheimplementationofeach
exportedfunctionoftheDLL.ThecompileradditionallyproducesanInterface
DescriptionLanguage(IDL)file(
mycomponent_idl.idl
),containingthe
specificationsforthecomponent’stypelibrary,interface,andclass,with
associatedGUIDs. (GUIDisanacronymforGloballyUniqueIdentifier,a
128-bitintegerguaranteedalwaystobeunique.)
CreatednextaretheC++classdefinitionandimplementationfiles
(
myclass_com.hpp
and
myclass_com.cpp
). Inadditiontothesesource
files,thecompilergeneratesaDLLexportsfile(
mycomponent.def
),a
resourcescript(
mycomponent.rc
),andaComponentTechnologyFile
(
mycomponent.ctf
). SeetheMATLABCompilerdocumentationfora
discussionof
ctf
files.
InterfaceDefinitionCreation
ThesecondstepofthebuildprocessinvokestheIDLcompilerontheIDLfile
generatedinstep1(
mycomponent_idl.idl
),creatingtheinterfaceheader
file(
mycomponent_idl.h
),theinterfaceGUIDfile(
mycomponent_idl_i.c
),
andthecomponenttypelibraryfile(
mycomponent_idl.tlb
). Theinterface
headerfilecontainstypedefinitionsandfunctiondeclarationsbasedonthe
A-3
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A
ProducingaCOMObjectfromMATLAB
interfacedefinitionintheIDLfile. TheinterfaceGUIDfilecontainsthe
definitionsoftheGUIDsfromallinterfacesintheIDLfile.Thecomponent
typelibraryfilecontainsabinaryrepresentationofalltypesandobjects
exposedbythecomponent.
C++Compilation
ThethirdstepcompilesallC/C++sourcefilesgeneratedinsteps1and
2intoobjectcode. OneadditionalfilecontainingasetofC++template
classes(
mclcomclass.h
)isincludedatthispoint.Thisfilecontainstemplate
implementationsofallnecessaryCOMbaseclasses,aswellaserrorhandling
andregistrationcode.
LinkingandResourceBinding
ThefourthstepproducesthefinishedDLLforthecomponent. Thisstep
invokesthelinkerontheobjectfilesgeneratedinstep3andthenecessary
MATLABlibrariestoproduceaDLLcomponent(
mycomponent_1_0.dll
).
TheresourcecompileristheninvokedontheDLL,alongwiththeresource
scriptgeneratedinstep1,tobindthetypelibraryfilegeneratedinstep2
intothecompletedDLL.
ComponentRegistration
ThefinalstepregisterstheDLLonthesystem,asdescribedin“Component
Registration”onpageA-5.
A-4
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ComponentRegistration
ComponentRegistration
WhenExcelBuildercreatesacomponent,itautomaticallygeneratesabinary
filecalledatypelibrary.Asafinalstepofthebuild,thisfileisboundwiththe
resultingDLLasaresource.
WhenprogrammingwithExcelcomponentsyoumightneeddetailsabout
acomponent. Youcanuse
componentinfo
,whichisaMATLABfunction,
toquerythesystemregistryfordetailsaboutanyinstalledExcelBuilder
component.
ObtainingRegistryInformation
WhenprogrammingwithCOMcomponentsyoumightneeddetailsabout
acomponent. Youcanuse
componentinfo
,whichisaMATLABfunction,
toquerythesystemregistryfordetailsaboutanyinstalledExcelBuilder
component.
QueryingtheRegisterforInformationAboutaComponent
Thisexamplequeriestheregistryforacomponentnamed
mycomponent
and
aversionof1.0. Thiscomponenthasfourmethods:
mysum
,
randvectors
,
getdates
,and
myprimes
,twoproperties:
m
and
n
,andoneevent:
myevent
.
Thereturnedstructurecontainsfieldscorrespondingtothemostimportant
informationfromtheregistryandtypelibraryforthecomponent.
Info = = componentinfo('mycomponent', , 1, 0)
Info =
Name: 'mycomponent'
TypeLib: 'mycomponent 1.0 0 Type Library'
LIBID: '{3A14AB34-44BE-11D5-B155-00D0B7BA7544}'
MajorRev: 1
MinorRev: 0
FileName: 'D:\Work\ mycomponent\distrib\mycomponent_1_0.dll'
Interfaces: [1x1 struct]
CoClasses: [1x1 1 struct]
Info.Interfaces
A-5
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A
ProducingaCOMObjectfromMATLAB
ans =
Name: 'Imyclass'
IID: '{3A14AB36-44BE-11D5-B155-00D0B7BA7544}'
Info.CoClasses
ans =
Name: 'myclass'
CLSID: '{3A14AB35-44BE-11D5-B155-00D0B7BA7544}'
ProgID: 'mycomponent.myclass.1_0'
VerIndProgID: 'mycomponent.myclass'
InprocServer32:'D:\Work\mycomponent\distrib\mycomponent_1_0.dll'
Methods: [1x4 struct]
Properties: {'m', 'n'}
Events: [1x1 struct]
Info.CoClasses.Events.M
ans =
function myevent(x, y)
Info.CoClasses.Methods
ans =
1x4 struct array with fields:
IDL
M
C
VB
Info.CoClasses.Methods.M
ans =
function [y] = = mysum(varargin)
A-6
ComponentRegistration
ans =
function [varargout] = = randvectors()
ans =
function [x] = = getdates(n, , inc)
ans =
function [p] = = myprimes(n)
Self-RegisteringComponents
ExcelBuildercomponentsareallselfregistering.Aself-registeringcomponent
containsallthenecessarycodetoaddorremoveafulldescriptionofitselfto
orfromthesystemregistry.The
mwregsvr
utility,distributedwiththeMCR,
registersself-registeringDLLs.Forexample,toregisteracomponentcalled
mycomponent_1_0.dll
,issuethiscommandattheDOScommandprompt.
mwregsvr mycomponent_1_0.dll
When
mwregsvr
completestheregistrationprocess,itdisplaysamessage
indicatingsuccessorfailure. Similarly,thecommand
mwregsvr /u mycomponent_1_0.dll
unregistersthecomponent.
AnExcelBuildercomponentinstalledontoaparticularmachinemustbe
registeredwith
mwregsvr
.Ifyoumoveacomponentintoadifferentdirectory
onthesamemachine,youmustrepeattheregistrationprocess. When
deletingacomponentfromaspecificmachine,firstunregisterittoensure
thattheregistrydoesnotretainerroneousinformation.
A-7
A
ProducingaCOMObjectfromMATLAB
Note The
mwregsvr
utilityinvokesaprocessthatissimilarto
regsvr32.exe
,
exceptthat
mwregsvr
doesnotrequireinteractionwithauserattheconsole.
The
regsvr32.exe
processbelongstotheWindowsOSandisusedtoregister
dynamiclinklibrariesandActiveXcontrolsintheregistry.Thisprogramis
importantforthestableandsecurerunningofyourcomputerandshouldnot
beterminated.Youcanuse
regsvr32.exe
asanalternativeto
mwregsvr
to
registeryourlibrary.
GloballyUniqueIdentifier(GUID)
Informationisstoredintheregistryaskeyswithoneormoreassociated
namedvalues. Thekeysthemselveshavevaluesofprimarilytwotypes:
readablestringsandGUIDs. (GUIDisanacronymforGloballyUnique
Identifier,whichisa128-bitintegerguaranteedalwaystobeunique.)
ExcelBuilderautomaticallygeneratesGUIDsforCOMclasses,interfaces,
andtypelibrariesthataredefinedwithinacomponentatbuildtime,and
codesthesekeysintothecomponent’sself-registrationcode.
Theinterfacetothesystemregistryisdirectorybased. COM-related
informationisstoredunderatop-levelkeycalled
HKEY_CLASSES_ROOT
.Under
HKEY_CLASSES_ROOT
areseveralotherkeysunderwhichExcelBuilderwrites
componentinformation. Seethefollowingtableforalistofthekeysand
theirdefinitions.
Key
Definition
HKEY_CLASSES_ROOT\CLSID
InformationaboutCOMclassesonthesystem.
Eachcomponentcreatesa newkeyunder
HKEY_CLASSES_ROOT\CLSID
foreachofitsCOM
classes.ThekeycreatedhasavalueoftheGUID
thathasbeenassignedtheclassandcontains
severalsubkeyswithinformationabouttheclass.
A-8
ComponentRegistration
(Continued)
Key
Definition
HKEY_CLASSES_ROOT\Interface
InformationaboutCOMinterfacesonthe
system.Eachcomponentcreatesanewkeyunder
HKEY_CLASSES_ROOT\Interface
foreachinterface
itdefines. ThiskeyhasthevalueoftheGUID
assignedtotheinterfaceandcontainssubkeys
withinformationabouttheinterface.
HKEY_CLASSES_ROOT\TypeLib
Informationabouttypelibrariesonthesystem.
Eachcomponentcreatesakeyforitstypelibrary
withthevalueoftheGUIDassignedtoit.Under
thiskeyanewkeyiscreatedforeachversion
ofthetypelibrary. Therefore,newversionsof
typelibrarieswiththesamenamereusethe
originalGUIDbutcreateanewsubkeyforthe
newversion.
HKEY_CLASSES_ROOT\<ProgID>,
HKEY_CLASSES_ROOT\<VerIndProgID>
Thesetwokeys are e createdfor the
component’s ProgramIDandVersion
Independent ProgramID.Thesekeys
areconstructedfromstrings of theform
<component-name>.<class-name>
and
<component-name>.<class-name>
<version-number>
Thesekeysareusefulforcreatingaclassinstance
fromthecomponentandclassnamesinstead
oftheGUIDs.
Versioning
MATLABBuilderforExcelcomponentssupportasimpleversioning
mechanismdesignedtomakebuildinganddeployingmultipleversionsofthe
samecomponenteasytoimplement. Theversionnumberofacomponent
appearsaspartoftheDLLname,aswellaspartoftheversion-dependentID
inthesystemregistry.
A-9
A
ProducingaCOMObjectfromMATLAB
Whenacomponentiscreated,youcanspecifyaversionnumber(default=
1.0
).Duringthedevelopmentofaspecificversionofacomponent,theversion
numbershouldbekeptconstant.Whenthisisdone,theMATLABCompiler,
incertaincases,reusestypelibrary,class,andinterfaceGUIDsforeach
subsequentbuildofthecomponent.Thisavoidsthecreationofanexcessive
numberofregistrykeysforthesamecomponentduringmultiplebuilds,as
occursifnewGUIDsaregeneratedforeachbuild.
Note Whenanewversionnumberisintroduced,theMATLABCompiler
generatesnewclassandinterfaceGUIDssothatthesystemrecognizesthem
asdistinctfrompreviousversions,eveniftheclassnameisthesame.
Therefore,onceyoudeployabuiltcomponent,useanewversionnumberfor
anychangesmadetothecomponent.Thisensuresthatafteryoudeploythe
newcomponent,itiseasytomanagethetwoversions.
TheMATLABCompilerimplementstheversioningrulesforaspecific
componentname,classname,andversionnumberbyqueryingthesystem
registryforanexistingcomponentwiththesamename:
• Ifanexistingcomponenthasthesameversion,itusestheGUIDofthe
existingcomponent’stypelibrary.Ifthenameofthenewclassmatchesthe
previousversion,itreusestheclassandinterfaceGUIDs.Iftheclassnames
donotmatch,itgeneratesnewGUIDsforthenewclassandinterface.
• Ifitfindsanexistingcomponentwithadifferentversion,itusesthe
existingtypelibraryGUIDandcreatesanewsubkeyforthenewversion
number.ItgeneratesnewGUIDsforthenewclassandinterface.
• Ifitdoesnotfindanexistingcomponentofthespecifiedname,itgenerates
newGUIDsforthecomponent’stypelibrary,class,andinterface.
A-10
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