Excel Add-in Development in C/C++: Applications in ... - F9

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Excel Functionality 171. a single literal value;2. an array of literal values;3. a reference to a single cell;4. a reference to a rectangular range of cells.In the first two cases, the values themselves can be any one of the basic Excel data types(see Worksheet data types and limits above for more detail).Excel attempts to convert from the supplied type to the function’s required type.(Chapter 8 Accessing Excel Functionality Using the C API, on page 169, explains howto construct and declare functions whose arguments are to be passed as is, without conversion.)Where Excel cannot convert an argument to the declared type, the function isevaluated to #VALUE!. Note that Excel does not call the code of the underlying functionif this happens.Consider a function that takes an array of values. Suppose it is passed a reference to arectangular range: Excel will convert the range to an array of the values that those cellscontain. However, in contrast to single-cell references, Excel will not convert the typesof those values. For example, the formula =SUM({123,"123"}) (note the curly braces whichsurround a literal array in Excel) evaluates to the number 123 since the second value in thearray is not converted from a string to a number. The formula =SUM(123,"123"), however,evaluates to 246 as Excel is quite happy to convert the string argument "123" to the number123 before passing it to SUM(). The reason for this is that such functions are declared astaking an Excel array type in which each element can be any one of a number of basicdata types, regardless of the types of the other elements. Excel cannot know what types thefunction ideally wants and leaves any element conversion to the function itself.Note that some functions can accept one of a number of types, for example, in thefunction IF(test, if true, if false), the second and third arguments can be any type and arepassed and returned unconverted depending on the outcome of the test. The fact thatrange references are not converted prior to IF() being called is most easily evidenced witha formula such as =ROWS(IF(A1,B1:B2,C1:C3)), which will return either the value 2 or 3depending on the value of A1.Table 2.8 details the conversions that Excel attempts to make (if necessary) in passingarguments to worksheet functions:Table 2.8 Worksheet function argument type conversionSupplied argumentNumberExcel will attempt, if required, to convert to...IntegerFloating point → Integer (by truncation of digits afterthe decimal point)(Converse does not apply, as all worksheet numbers arefloating point.)StringIn default number format with as much precision asrequired to represent the number up to the maximumprecision supported by Excel.BooleanZero → FALSE(continued overleaf )
18 Excel Add-in Development in C/C++Table 2.8 (continued)Supplied argumentExcel will attempt, if required, to convert to...Non-zero → TRUEStringNumberMust be any one of Excel’s known number formatsincluding date, time, etc.BooleanMust be ‘true’ or ‘false’ (not case-sensitive).BooleanNumberTrue → 1False → 0(Conversion not always performed).StringTrue → “TRUE”False → “FALSE”Single cell reference1st step:Value of cell referred to.2nd step:Number → Integer, String or BooleanString → Number or BooleanBoolean → Number or StringMultiple cell referenceArray(Note: each element in the array has the same data typeas the corresponding cell’s value).2.6.12 Operator evaluation precedenceTable 2.9 Operator evaluation precedenceOperators (operation)NotesName lookup and substitutionReference-to-value and type conversion() and worksheet functions Evaluated left to right%, unary –ˆ =4^50% evaluates to 2*/Binary +−&Binary =, , =, =4+2&1+5="66" evaluates to TRUEEvaluated left to right
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Page 5 and 6: Wiley Finance SeriesFor other title
Page 7 and 8: Copyright © 2005John Wiley & Sons
Page 9 and 10: viContents2.6.11 Worksheet function
Page 11 and 12: viiiContents4.11 Accessing DLL func
Page 13 and 14: xContents8.7.2 Getting the availabl
Page 15 and 16: xiiContents8.14.6 Trapping a window
Page 18 and 19: PrefaceThis book is intended to pro
Page 20: AcknowledgementsI would like to ack
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68 Excel Add-in Development in C/C+
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4Creating a 32-bit Windows (Win32)
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Creating a 32-bit Windows (Win32) D
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4.7.1 Definition (*.DEF) filesCreat
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5Turning DLLs into XLLs: The Add-in
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Turning DLLs into XLLs: The Add-in
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5.5.7 xlAutoFreeTurning DLLs into X
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6Passing Data between Excel and the
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6.2.2 Excel floating-point array st
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Passing Data between Excel and the
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6.8.7 Array (mixed type): xltypeMul
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How you convert it to a C/C++ data
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7Memory Management7.1 EXCEL STACK S
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Table 7.1 Returned xlopers for whic
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Memory Management 165// Excel to fr
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Memory Management 167ret_oper.val.a
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8Accessing Excel FunctionalityUsing
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Accessing Excel Functionality Using
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Table 8.5 When it is safe to call t
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8.5.8 Function help parameter to xl
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An exported command will always be
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Table 8.14 (continued)Accessing Exc
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8.15.2 Displaying text in the statu
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9Miscellaneous Topics9.1 TIMING FUN
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Miscellaneous Topics 287convincing.
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Miscellaneous Topics 289The equival
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Miscellaneous Topics 291Table 9.4 (
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Miscellaneous Topics 2939.2.1 Concl
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Miscellaneous Topics 295// The call
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Miscellaneous Topics 297not covered
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The following code shows how these
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Miscellaneous Topics 301|| (cmd_len
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Miscellaneous Topics 303}if(hr != S
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Miscellaneous Topics 305}// Success
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Miscellaneous Topics 307an incremen
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Miscellaneous Topics 309// Are we l
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Miscellaneous Topics 311// Incremen
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Miscellaneous Topics 313}m_Workshee
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Miscellaneous Topics 315// Not crea
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Miscellaneous Topics 317command xlc
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Miscellaneous Topics 319from an Exc
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Miscellaneous Topics 321function re
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Miscellaneous Topics 323Table 9.7 (
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Miscellaneous Topics 325The decisio
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Miscellaneous Topics 327• m Suspe
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Miscellaneous Topics 329}Sleep(0);}
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Miscellaneous Topics 3319.10.10 Con
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Miscellaneous Topics 333There are s
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Web Links and Other ResourcesThere
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Index#pragma pack 62-416-bit softwa
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Index 389access methods 169-80array
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Index 391data types 7, 10-18, 21-3,
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Index 393exports 81-2, 85-7, 95-104
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Index 395libraries 1, 3-4, 75-94, 9
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Index 397optionsdates 363-71pricing
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Index 399toolbars 7, 9, 41-5, 251-2
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Index 401limits 10-12names 35-40, 2
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Index 403memory considerations 142u
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