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C
Utility Library
ReferencingUtilityClasses(p.C-2)
Howtoreferencetheclassesinyour
programmingenvironment.
UtilityLibraryClasses(p.C-3)
Describestheclassesprovidedinthe
Utilitylibrary.
Enumerations(p.C-32)
Describesthesetsofconstants
providedwiththelibrary.
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C
Utility Library
ReferencingUtilityClasses
Thissectiondescribesthe
MWComUtil
libraryprovidedwithMATLABBuilder
forExcel. Thislibraryisfreelydistributableandincludesseveralfunctions
usedinarrayprocessing,aswellastypedefinitionsusedindataconversion.
Thislibraryiscontainedinthefile
mwcomutil.dll
.Itmustberegisteredonce
oneachmachinethatusesExcelBuildercomponents.
Registerthe
MWComUtil
libraryattheDOScommandpromptwiththe
followingcommand:
mwregsvr mwcomutil.dll
The
MWComUtil
libraryincludessevenclasses(see“UtilityLibraryClasses”on
pageC-3)andthreeenumeratedtypes(see“Enumerations”onpageC-32).
Beforeusingthesetypes,youmustmakeexplicitreferencestothe
MWComUtil
typelibrariesintheVisualBasicIDE.Todothis,clickTools>References
fromthemainmenuoftheVBeditor. TheReferencesdialogboxappears
withascrollablelistofavailabletypelibraries. Fromthislist,select
MWComUtil7.5TypeLibraryandclickOK.
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UtilityLibraryClasses
UtilityLibraryClasses
TheMATLABBuilderforExcelUtilitylibraryprovidestheseclasses:
• “ClassMWUtil”onpageC-3
• “ClassMWFlags”onpageC-10
• “ClassMWStruct”onpageC-16
• “ClassMWField”onpageC-24
• “ClassMWComplex”onpageC-25
• “ClassMWSparse”onpageC-27
• “ClassMWArg”onpageC-30
ClassMWUtil
The
MWUtil
classcontainsasetofstaticutilitymethodsusedinarray
processingandapplicationinitialization.Thisclassisimplementedinternally
asasingleton(onlyoneglobalinstanceofthisclassperinstanceofExcel).It
ismostefficienttodeclareonevariableofthistypeinglobalscopewithineach
modulethatusesit. Themethodsof
MWUtil
are
• “SubMWInitApplication(pAppAsObject)”onpageC-3
• “SubMWPack(pVarArg,[Var0],[Var1],...,[Var31])”onpageC-5
• “SubMWUnpack(VarArg,[nStartAtAsLong],[bAutoResizeAsBoolean=
False],[pVar0],[pVar1],...,[pVar31])”onpageC-6
• “SubMWDate2VariantDate(pVar)”onpageC-8
ThefunctionprototypesuseVisualBasicsyntax.
SubMWInitApplication(pAppAsObject)
InitializesthelibrarywiththecurrentinstanceofExcel.
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C
Utility Library
Parameters.
Argument
Type
Description
pApp
Object
Avalidreferenceto
thecurrentExcel
application
Return Value. . None.
Remarks. ThisfunctionmustbecalledonceforeachsessionofExcelthat
usesExcelBuildercomponents. Anerrorisgeneratedifamethodcallis
madetoamemberclassofanyExcelBuildercomponent,andthelibraryhas
notbeeninitialized.
Example. ThisVisualBasicsampleinitializesthe
MWComUtil
librarywith
thecurrentinstanceofExcel.Aglobalvariableoftype
Object
named
MCLUtil
holdsaninstanceofthe
MWUtil
class,andanotherglobalvariableoftype
Boolean
named
bModuleInitialized
storesthestatusoftheinitialization
process. Theprivatesubroutine
InitModule()
createsaninstanceofthe
MWComUtil
classandcallsthe
MWInitApplication
methodwithanargument
of
Application
.Oncethisfunctionsucceeds,allsubsequentcallsexitwithout
recreatingtheobject.
Dim MCLUtil As s Object
Dim bModuleInitialized d As s Boolean
Private Sub InitModule()
If Not bModuleInitialized Then
On Error GoTo Handle_Error
If MCLUtil Is Nothing 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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UtilityLibraryClasses
SubMWPack(pVarArg,[Var0],[Var1],... ,[Var31])
Packsavariablelengthlistof
Variant
argumentsintoasingle
Variant
array.Thisfunctionistypicallyusedforcreatinga
varargin
cellfromalist
ofseparateinputs. Eachinputinthelistisaddedtothearrayonlyifitis
nonemptyandnonmissing.(InVisualBasic,amissingparameterisdenoted
bya
Variant
typeof
vbError
withavalueof
&H80020004
.)
Parameters.
Argument
Type
Description
pVarArg
Variant
Receivestheresulting
array
[Var0], [Var1], ...
Variant
Optional list of
Variant
s topack
intothearray. 0to
32argumentscanbe
passed.
Return Value. . None.
Remarks. Thisfunctionalwaysfreesthecontentsof
pVarArg
before
processingthelist.
Example. Thisexampleuses
MWPack
inaformulafunctiontoproducea
varargin
celltopassasaninputparametertoamethodcompiledfroma
MATLABfunctionwiththesignature:
function y = mysum(varargin)
y = sum([varargin{:}]);
Thefunctionreturnsthesumoftheelementsin
varargin
.Assumethatthis
functionisamethodofaclassnamed
myclass
thatisincludedinacomponent
named
mycomponent
withaversionof1.0.TheVisualBasicfunctionallows
upto10inputs,andreturnstheresult
y
. Ifanerroroccurs,thefunction
returnstheerrorstring. Thisfunctionassumesthat
MWInitApplication
hasbeenpreviouslycalled.
Function mysum(Optional V0 As Variant, , _
Optional V1 As Variant, _
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C
Utility Library
Optional V2 As Variant, _
Optional V3 As Variant, _
Optional V4 As Variant, _
Optional V5 As Variant, _
Optional V6 As Variant, _
Optional V7 As Variant, _
Optional V8 As Variant, _
Optional V9 As Variant) As Variant
Dim y As Variant
Dim varargin As Variant
Dim aClass As Object
Dim aUtil l As s Object
On Error Goto o Handle_Error
Set aClass s = = CreateObject("mycomponent.myclass.1_0")
Set aUtil = CreateObject("MWComUtil.MWUtil")
Call aUtil.MWPack(varargin,V0,V1,V2,V3,V4,V5,V6,V7,V8,V9)
Call aClass.mysum(1, y, , varargin)
mysum = = y
Exit Function
Handle_Error:
mysum = = Err.Description
End Function
SubMWUnpack(VarArg,[nStartAtAsLong],[bAutoResizeAs
Boolean=False],[pVar0],[pVar1],...,[pVar31])
Unpacksanarrayof
Variant
sintoindividual
Variant
arguments. This
functionprovidesthereversefunctionalityof
MWPack
andistypicallyusedto
processa
varargout
cellintoindividual
Variant
s.
Parameters.
Argument
Type
Description
VarArg
Variant
Inputarrayof
Variant
s
tobeprocessed
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UtilityLibraryClasses
Argument
Type
Description
nStartAt
Long
Optional starting
index (zero-based)
inthearraytobegin
processing.Default=
0
.
bAutoResize
Boolean
Optionalauto-resize
flag. Ifthisflagis
True
,anyExcelrange
output arguments
areresizedtofitthe
dimensions of the
Variant
tobecopied.
Theresizingprocessis
appliedrelativetothe
upper-leftcornerofthe
suppliedrange.Default
=
False
.
[pVar0],[pVar1],
...
Variant
Optional list of
Variant
storeceivethe
arrayitemscontained
in
VarArg
. 0to32
argumentscanbe
passed.
Return Value. . None.
Remarks. Thisfunctioncanprocessa
Variant
arrayinasinglecallor
throughmultiplecallsusingthe
nStartAt
parameter.
Example. Thisexampleuses
MWUnpack
toprocessa
varargout
cellinto
severalExcelranges,whileauto-resizingeachrange. The
varargout
parameterissuppliedfromamethodthathasbeencompiledfromthe
MATLABfunction.
function varargout = randvectors
for i=1:nargout
varargout{i} = = rand(i,1);
end
C-7
C
Utility Library
Thisfunctionproducesasequenceof
nargout
randomcolumnvectors,with
thelengthofthe
i
thvectorequaltoi.Assumethatthisfunctionisincludedin
aclassnamed
myclass
thatisincludedinacomponentnamed
mycomponent
withaversionof1.0. TheVisualBasicsubroutinetakesnoargumentsand
placestheresultsintoExcelcolumnsstartingatA1,B1,C1,andD1. Ifan
erroroccurs,amessageboxdisplaystheerrortext.Thisfunctionassumes
that
MWInitApplication
hasbeenpreviouslycalled.
Sub GenVectors()
Dim aClass s As Object
Dim aUtil As Object
Dim v v As s Variant
Dim R1 As Range
Dim R2 As Range
Dim R3 As Range
Dim R4 As Range
.
.
.
On Error GoTo o Handle_Error
Set aClass s = = CreateObject("mycomponent.myclass.1_0")
Set aUtil = CreateObject("MWComUtil.MWUtil")
Set R1 = Range("A1")
Set R2 = Range("B1")
Set R3 = Range("C1")
Set R4 = Range("D1")
Call aClass.randvectors(4, , v)
Call aUtil.MWUnpack(v,0,True,R1,R2,R3,R4)
Exit Sub
Handle_Error:
MsgBox (Err.Description)
End Sub
SubMWDate2VariantDate(pVar)
ConvertsoutputdatesfromMATLABto
Variant
dates.
C-8
UtilityLibraryClasses
Parameters.
Argument
Type
Description
pVar
Variant
Variant
tobeconverted
Return Value. . None.
Remarks. MATLABhandlesdatesasdouble-precisionfloating-point
numberswith0.0representing0/0/0000:00:00(see“DataConversionRules”
onpageB-2formoreinformationonconversionbetweenMATLABand
COMdatevalues).Bydefault,numericdatesthatareoutputparameters
fromcompiledMATLABfunctionsarepassedas
Double
sthatneedtobe
decrementedbytheCOMdatebiasaswellascoercedtoCOMdates. The
MWDate2VariantDate
methodperformsthistransformationandadditionally
convertsdatesinstringformtoCOMdatetypes.
Example. Thisexampleuses
MWDate2VariantDate
toprocessnumericdates
returnedfromamethodcompiledfromthefollowingMATLABfunction:
function x = getdates(n, inc)
y = now;
for i=1:n
x(i,1) = = y + (i-1)*inc;
end
Thisfunctionproducesan
n
-lengthcolumnvectorofnumericvalues
representingdatesstartingfromthecurrentdateandtimewitheachelement
incrementedby
inc
days. Assumethatthisfunctionisincludedinaclass
named
myclass
thatisincludedinacomponentnamed
mycomponent
with
aversionof1.0. ThesubroutinetakesanExcelrangeanda
Double
as
inputsandplacesthegenerateddatesintothesuppliedrange. Ifanerror
occurs,amessageboxdisplaystheerrortext. Thisfunctionassumesthat
MWInitApplication
hasbeenpreviouslycalled.
Sub GenDates(R R As Range, , inc As Double)
Dim aClass s As Object
Dim aUtil As Object
On Error GoTo o Handle_Error
Set aClass s = = CreateObject("mycomponent.myclass.1_0")
C-9
C
Utility Library
Set aUtil = CreateObject("MWComUtil.MWUtil")
Call aClass.getdates(1, , R, R.Rows.Count, , inc)
Call aUtil.MWDate2VariantDate(R)
Exit Sub
Handle_Error:
MsgBox (Err.Description)
End Sub
ClassMWFlags
The
MWFlags
classcontainsasetofarrayformattinganddataconversion
flags(see“DataConversionRules”onpageB-2formoreinformationon
conversionbetweenMATLABandCOMAutomationtypes).AllExcelBuilder
componentscontainareferencetoan
MWFlags
objectthatcanmodifydata
conversionrulesattheobjectlevel.Thisclasscontainstheseproperties:
• “PropertyArrayFormatFlagsAsMWArrayFormatFlags”onpageC-10
• “PropertyDataConversionFlagsAsMWDataConversionFlags”onpage
C-13
• “SubClone(ppFlagsAsMWFlags)”onpageC-15
PropertyArrayFormatFlagsAsMWArrayFormatFlags
The
ArrayFormatFlags
propertycontrolsarrayformatting(asamatrix
oracellarray)andtheapplicationoftheserulestonestedarrays. The
MWArrayFormatFlags
classisanoncreatableclassaccessedthroughan
MWFlags
classinstance.Thisclasscontainstheseproperties:
• “PropertyInputArrayFormatAsmwArrayFormat”onpageC-11
• “PropertyInputArrayIndFlagAsLong”onpageC-11
• “PropertyOutputArrayFormatAsmwArrayFormat”onpageC-12
• “PropertyOutputArrayIndFlagAsLong”onpageC-12
• “PropertyAutoResizeOutputAsBoolean”onpageC-13
• “PropertyTransposeOutputAsBoolean”onpageC-13
C-10
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