UtilityLibraryClasses
Dim Index1(1 To 2) As Integer
Dim Index2(1 To 2) As Integer
Index1(1) = = 1
Index1(2) = = 1
Index2(1) = = 3
Index2(2) = = 2
x(Index1, Index2, 2, , "red") ) = = 0.5
Thelaststatementresolvesto
x(1, 1, , 3, 2, 2, "red") = 0.5
• Thefieldnamemustbethelastindexinthelist.Thefollowingstatement
producesanerror:
y = = x("blue", 1, 2)
• Fieldnamesarecasesensitive.
PropertyNumberOfFieldsAsLong
Theread-only
NumberOfFields
propertyreturnsthenumberoffieldsinthe
structurearray.
PropertyNumberOfDimsAsLong
Theread-only
NumberOfDims
propertyreturnsthenumberofdimensions
inthestructurearray.
PropertyDimsAs Variant
Theread-only
Dims
propertyreturnsanarrayoflength
NumberOfDims
that
containsthesizeofeachdimensionofthestructurearray.
PropertyFieldNamesAs Variant
Theread-only
FieldNames
propertyreturns anarrayoflength
NumberOfFields
thatcontainsthefieldnamesoftheelementsofthestructure
array.
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C
Utility Library
Example. ThenextVisualBasiccodesampleillustrateshowtoaccessa
two-dimensionalstructurearray’sfieldswhenthefieldnamesanddimension
sizesarenotknowninadvance:
Sub foo ()
Dim x x As s MWStruct
Dim Dims as Variant
Dim FieldNames s As Variant
On Error r Goto o Handle_Error
'
'... Call a a method d that returns an MWStruct in x
'
Dims = x.Dims
FieldNames = x.FieldNames
For I I From 1 To Dims(1)
For J J From 1 1 To o Dims(2)
For K From 1 1 To o x.NumberOfFields
y = = x(I,J,FieldNames(K))
' ... Do something with y
Next
Next
Next
Exit Sub
Handle_Error:
MsgBox(Err.Description)
End Sub
SubClone(ppStructAsMWStruct)
Createsacopyofan
MWStruct
object.
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UtilityLibraryClasses
Parameters.
Argument
Type
Description
ppStruct
MWStruct
Reference to an
uninitialized
MWStruct
objecttoreceivethe
copy
Return Value. None
Remarks.
Clone
allocatesanew
MWStruct
objectandcreatesadeepcopy
oftheobject’scontents.Callthisfunctionwhenaseparateobjectisrequired
insteadofasharedcopyofanexistingobjectreference.
Example. ThefollowingVisualBasicexampleillustratesthedifference
betweenassignmentand
Clone
for
MWStruct
objects:
Sub foo ()
Dim x1 As MWStruct
Dim x2 As MWStruct
Dim x3 As MWStruct
On Error Goto o Handle_Error
Set x1 = new MWStruct
x1("name") = = "John n Smith"
x1("age") = 35
'Set reference e of f x1 to x2
Set x2 = x1
'Create new w object t for x3 and copy contents s of f x1 into it
Call x1.Clone(x3)
'x2's "age" " field d is also modified 'x3's s "age" " field unchanged
x1("age") = 50
.
.
.
Exit Sub
Handle_Error:
MsgBox(Err.Description)
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C
Utility Library
End Sub
ClassMWField
The
MWField
classholdsasinglefieldreferenceinan
MWStruct
object. This
classisnoncreatableandcontainstheseproperties/methods:
• “PropertyNameAsString”onpageC-24
• “PropertyValueAsVariant”onpageC-24
• “PropertyMWFlagsAsMWFlags”onpageC-24
• “SubClone(ppFieldAsMWField)”onpageC-24
PropertyNameAs String
Thenameofthefield(readonly).
PropertyValueAsVariant
Storesthefield’svalue(read/write). The
Value
propertyisthedefault
propertyofthe
MWField
class. Thevalueofafieldcanbeanytypethatis
coercibletoa
Variant
,aswellasobjecttypes.
PropertyMWFlagsAs MWFlags
Storesareferencetoan
MWFlags
object.Thispropertysetsorgetsthearray
formattinganddataconversionflagsforaparticularfield.Eachfieldina
structurehasitsown
MWFlags
property.Thispropertyoverridesthevalueof
anyflagssetontheobjectwhosemethodsarecalled.
SubClone(ppFieldAsMWField)
Createsacopyofan
MWField
object.
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UtilityLibraryClasses
Parameters.
Argument
Type
Description
ppField
MWField
Reference to an
uninitialized
MWField
objecttoreceivethe
copy
Return Value. None.
Remarks.
Clone
allocatesanew
MWField
objectandcreatesadeepcopyof
theobject’scontents. Callthisfunctionwhenaseparateobjectisrequired
insteadofasharedcopyofanexistingobjectreference.
ClassMWComplex
The
MWComplex
classpassesorreceivesacomplexnumericarrayintoorfrom
acompiledclassmethod.Thisclasscontainstheseproperties/methods:
• “PropertyRealAsVariant”onpageC-25
• “PropertyImagAsVariant”onpageC-25
• “PropertyMWFlagsAsMWFlags”onpageC-26
• “SubClone(ppComplexAsMWComplex)”onpageC-27
PropertyRealAs Variant
Storestherealpartofacomplexarray(read/write).The
Real
propertyisthe
defaultpropertyofthe
MWComplex
class.Thevalueofthispropertycanbeany
typecoercibletoa
Variant
,aswellasobjecttypes,withtherestrictionthat
theunderlyingarraymustresolvetoanumericmatrix(nocelldataallowed).
ValidVisualBasicnumerictypesforcomplexarraysinclude
Byte
,
Integer
,
Long
,
Single
,
Double
,
Currency
,and
Variant/vbDecimal
.
PropertyImagAsVariant
Storestheimaginarypartofacomplexarray(read/write).The
Imag
property
isoptionalandcanbe
Empty
forapurerealarray. Ifthe
Imag
propertyis
nonemptyandthesizeandtypeoftheunderlyingarraydonotmatchthesize
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C
Utility Library
andtypeofthe
Real
property’sarray,anerrorresultswhentheobjectis
usedinamethodcall.
Example. ThefollowingVisualBasiccodecreatesacomplexarraywith
thefollowingentries:
x = = [ 1+i 1+2i
2+i 2+2i ]
Sub foo()
Dim x x As s MWComplex
Dim rval(1 1 To 2, , 1 1 To o 2) As Double
Dim ival(1 1 To 2, , 1 1 To o 2) As Double
On Error Goto o Handle_Error
For I I = = 1 To 2
For J = 1 1 To o 2
rval(I,J) = = I
ival(I,J) = = J
Next
Next
Set x x = = new MWComplex
x.Real = rval
x.Imag = ival
.
.
.
Exit Sub
Handle_Error:
MsgBox(Err.Description)
End Sub
PropertyMWFlagsAs MWFlags
Storesareferencetoan
MWFlags
object.Thispropertysetsorgetsthearray
formattinganddataconversionflagsforaparticularcomplexarray.Each
MWComplex
objecthasitsown
MWFlags
property. Thispropertyoverridesthe
valueofanyflagssetontheobjectwhosemethodsarecalled.
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UtilityLibraryClasses
SubClone(ppComplexAsMWComplex)
Createsacopyofan
MWComplex
object.
Parameters.
Argument
Type
Description
ppComplex
MWComplex
Reference to
an uninitialized
MWComplex
objectto
receivethecopy
Return Value. None
Remarks.
Clone
allocatesanew
MWComplex
objectandcreatesadeepcopy
oftheobject’scontents.Callthisfunctionwhenaseparateobjectisrequired
insteadofasharedcopyofanexistingobjectreference.
ClassMWSparse
The
MWSparse
classpassesorreceivesatwo-dimensionalsparsenumericarray
intoorfromacompiledclassmethod.Thisclasshastheseproperties/methods:
• “PropertyNumRowsAsLong”onpageC-27
• “PropertyNumColumnsAsLong”onpageC-28
• “PropertyRowIndexAsVariant”onpageC-28
• “PropertyColumnIndexAsVariant”onpageC-28
• “PropertyArrayAsVariant”onpageC-28
• “PropertyMWFlagsAsMWFlags”onpageC-28
• “SubClone(ppSparseAsMWSparse)”onpageC-29
PropertyNumRowsAsLong
Storestherowdimensionforthearray. Thevalueof
NumRows
mustbe
nonnegative.Ifthevalueiszero,therowindexistakenfromthemaximum
ofthevaluesinthe
RowIndex
array.
C-27
C
Utility Library
PropertyNumColumnsAsLong
Storesthecolumndimensionforthearray.Thevalueof
NumColumns
mustbe
nonnegative.Ifthevalueis0,therowindexistakenfromthemaximumof
thevaluesinthe
ColumnIndex
array.
PropertyRowIndex AsVariant
Storesthearrayofrowindicesofthenonzeroelementsofthearray.Thevalue
ofthispropertycanbeanytypecoercibletoa
Variant
,aswellasobjecttypes,
withtherestrictionthattheunderlyingarraymustresolvetoorbecoercible
toanumericmatrixoftype
Long
.Ifthevalueof
NumRows
isnonzeroandany
rowindexisgreaterthan
NumRows
,abad-indexerroroccurs.Anerroralso
resultsifthenumberofelementsinthe
RowIndex
arraydoesnotmatchthe
numberofelementsinthe
Array
property’sunderlyingarray.
PropertyColumnIndexAsVariant
Storesthearrayofcolumnindicesofthenonzeroelementsofthearray.The
valueofthispropertycanbeanytypecoercibletoa
Variant
,aswellasobject
types,withtherestrictionthattheunderlyingarraymustresolvetoorbe
coercibletoanumericmatrixoftype
Long
. Ifthevalueof
NumColumns
is
nonzeroandanycolumnindexisgreaterthan
NumColumns
,abad-indexerror
occurs.Anerroralsoresultsifthenumberofelementsinthe
ColumnIndex
arraydoesnotmatchthenumberofelementsinthe
Array
property’s
underlyingarray.
PropertyArrayAsVariant
Storesthenonzeroarrayvaluesofthesparsearray.Thevalueofthisproperty
canbeanytypecoercibletoa
Variant
,aswellasobjecttypes,withthe
restrictionthattheunderlyingarraymustresolvetoorbecoercibletoa
numericmatrixoftype
Double
or
Boolean
.
PropertyMWFlagsAs MWFlags
Storesareferencetoan
MWFlags
object.Thispropertysetsorgetsthearray
formattinganddataconversionflagsforaparticularsparsearray. Each
MWSparse
objecthasitsown
MWFlags
property.Thispropertyoverridesthe
valueofanyflagssetontheobjectwhosemethodsarecalled.
C-28
UtilityLibraryClasses
SubClone(ppSparseAsMWSparse)
Createsacopyofan
MWSparse
object.
Parameters.
Argument
Type
Description
ppSparse
MWSparse
Reference to an
uninitialized
MWSparse
objecttoreceivethe
copy
Return Value. None.
Remarks.
Clone
allocatesanew
MWSparse
objectandcreatesadeepcopy
oftheobject’scontents.Callthisfunctionwhenaseparateobjectisrequired
insteadofasharedcopyofanexistingobjectreference.
Example. ThefollowingVisualBasicsamplecreatesa5-by-5tridiagonal
sparsearraywiththefollowingentries:
X = = [ 2 -1
0
0
0
-1
2 -1
0
0
0 -1
2
-1
0
0
0 -1
2
-1
0
0
0
-1
2 ]
Sub foo()
Dim x x As s MWSparse
Dim rows(1 1 To 13) ) As Long
Dim cols(1 1 To 13) ) As Long
Dim vals(1 1 To 13) ) As Double
Dim I I As s Long, K As Long
On Error GoTo o Handle_Error
K = 1
For I I = = 1 To 4
rows(K) = = I
cols(K) = = I I + 1
C-29
C
Utility Library
vals(K) = = -1
K = = K + 1
rows(K) = = I
cols(K) = = I
vals(K) = = 2
K = = K + 1
rows(K) = = I I + 1
cols(K) = = I
vals(K) = = -1
K = = K + 1
Next
rows(K) = 5
cols(K) = 5
vals(K) = 2
Set x x = = New MWSparse
x.NumRows = 5
x.NumColumns = 5
x.RowIndex = = rows
x.ColumnIndex = = cols
x.Array = vals
.
.
.
Exit Sub
Handle_Error:
MsgBox (Err.Description)
End Sub
ClassMWArg
The
MWArg
classpassesagenericargumentintoacompiledclassmethod.This
classpassesanargumentforwhichthedataconversionflagsarechangedfor
thatoneargument.Thisclasshastheseproperties/methods:
• “PropertyValueAsVariant”onpageC-31
• “PropertyMWFlagsAsMWFlags”onpageC-31
• “SubClone(ppArgAsMWArg)”onpageC-31
C-30
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