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Let s first cover what happens when structured data is marshalled by the CLR in the case of nontrivial argument types. Here you see the SumC function responsible for adding two complex numbers defined by the Complex C data structure: typedef struct _Complex { double re; double im; } Complex; Complex CINTEROPDLL_API SumC(Complex c1, Complex c2) { Complex ret; ret.re = c1.re + c2.re; ret.im = c1.im + c2.im; return ret; } To invoke this function from F#, you must define a data structure in F# corresponding to the Complex C structure. If the memory layout of an instance of the F# structure is the same as that of the corresponding C structure, then values can be shared between the two languages. But how can you control the memory layout of a managed data structure Fortunately, the PInvoke specification helps with custom attributes that let you specify the memory layout of data structures. The StructLayout custom attribute indicates the strategy adopted by the runtime to lay out fields of the data structure. By default, the runtime adopts its own strategy in an attempt to optimize the size of the structure, keeping fields aligned to the machine world in order to ensure fast access to the structure s fields. The C standard ensures that fields are laid out in memory sequentially in the order they appear in the structure definition; other languages may use different strategies. Using an appropriate argument,

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you can indicate that a C-like sequential layout strategy should be adopted. It s also possible to provide an explicit layout for the structure, indicating the offset in memory for each field of the structure. This example uses the sequential layout for the Complex value type: module CInterop = [<Struct; StructLayout(LayoutKind.Sequential)>] type Complex = val mutable re:double val mutable im:double new(r,i) = { re = r; im = i; } [<DllImport("CInteropDLL")>] extern Complex SumC(Complex c1, Complex c2) let c1 = CInterop.Complex(1.0, 0.0) let c2 = CInterop.Complex(0.0, 1.0) let mutable c3 = CInterop.SumC(c1, c2) printf "c3 = SumC(c1, c2) = %f + %fi\n" c3.re c3.im; The SumC prototype refers to the F# Complex value type. But because the layout of the structure in memory is the same as the corresponding C structure, the runtime passes the bits that are consistent with those expected by the C code.

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In this exercise you will use Excel 2003 to create a cube file. Later, you will use Excel 2007 or Excel 2003 to display the cube file s data in Excel. Using Excel 2003, connect to the data that you will use to create the cube file: 1. Start Excel. 2. Click Data Import External Data New Database Query.

A critical aspect of dealing with PInvoke is ensuring that values are marshalled correctly between managed and native code and vice versa. A structure s memory layout doesn t depend only on the order of the fields. Compilers often introduce padding to align fields to memory addresses so that access to fields requires fewer memory operations, because CPUs load data into registers with the same strategy. Padding may speed up access to the data structure, but it introduces inefficiencies in memory usage: there may be gaps in the structures, leading to allocated but unused memory. Consider, for instance, the following C structure:

interested in certain aspects of this at all times, disabling those items not used can result in a noticeable performance increase.

struct Foo { int i; char c; short s; };

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3 With the Use the Query Wizard to Create/Edit Queries check box selected and the Databases tab selected, click Excel Files, and click OK 4 Browse to and select the ExcelDB_Ch01_05xls file, and click OK 5 Click Options 6 Select the System Tables check box, and click OK 7 In the Available Tables and Columns list, click Data$, click the right arrow ( ) button, and click Next 8 Click Next two more times 9 Select the Create an OLAP Cube from This Query option, and click Finish The Welcome to the OLAP Cube Wizard page or the OLAP Cube Wizard Step 1 of 3 page appears Next, use Excel 2003 to create the cube file: 1 If the Welcome to the OLAP Cube Wizard page is displayed, click Next 2 Clear the Year and Quarter check boxes, and click Next 3.

Depending on the compiler decision, it may occupy from 8 to 12 bytes on a 32-bit architecture. The most compact version of the structure uses the first 4 bytes for i, a single byte for c, and 2 more bytes for s. If the compiler aligns fields to addresses that are multiples of 4, then the integer i occupies the first slot, 4 more bytes are allocated for c (although only one is used), and the same happens for s. Padding is a common practice in C programs; because it may affect performance and memory usage, directives instruct the compiler about padding. It s possible to have data structures with different padding strategies running within the same program.

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