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The CALLBACK macro is specific to the Microsoft Visual C++ compiler and expands to __stdcall in order to indicate that the function pointer, when invoked, should adopt the stdcall calling convention instead of the cdecl calling convention The transformArray function simply takes as input an array of integers with its length and the function to apply to its elements You now have to define the F# prototype for this function by introducing a delegate type with the same signature as TRANSFORM_CALLBACK: type Callback = delegate of int -> int [<DllImport("CInteropDLL", CallingConvention=CallingConventionCdecl)>] extern void transformArray(int[] data, int count, Callback transform); Now you can increment all the elements of an array by one using the C function: let data = [| 1; 2; 3 |] printf "%s\n" (stringJoin("; ", (Arraymap any_to_string data))) CInteroptransformArray(data, dataLength, new CInteropCallback(fun x -> x + 1)) printf "%s\n" (string.

3.1 Copy and Move Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 Quick Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 How To . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 Try It . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

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Join("; ", (Arraymap any_to_string data))).

PInvoke declarations are concise, but you must pay attention that for data types such as function pointers, parameter passing can be expensive. In general, libraries assume that crossing the language boundary causes a loss of efficiency and callbacks are invoked at a price different from ordinary functions. In this respect, the example represents a situation where the overhead of PInvoke is significant since a single call to transformArray causes a number of callbacks without performing any real computation into the native code.

10. Select the following classes (place a plus sign in each check box):

To normalize repetitive data, you eliminate the repeating data in data records and data fields, moving the repeating data to other data tables. You then use primary keys and foreign keys to cross-reference related data records among those data tables.

As a more complicated example of PInvoke usage, in this section we show how to benefit from memory mapping into F# programs Memory mapping is a popular technique that allows a program to see a file (or a portion of a file) as if it was in memory, providing an efficient way to access files because the operating system uses the machinery of virtual memory for accessing files and significantly speeding up data access on files After proper initialization, which we will cover in a moment, the program obtains a pointer into the memory, and access to that portion of memory appears the same as accessing data stored in or into the file Memory mapping can be used both for reading and writing files, and every access performed into the memory is reflected into the corresponding position into the file.

This is a typical sequence of system calls in order to map a file in memory: 1 A call to the CreateFile system call to open the file and obtain a handle to the file 2 A call to the CreateFileMapping system call to create a mapped file object 3 One or more calls to MapViewOfFile and UnmapViewOfFile to map and release portions of a file into memory In a typical usage, the whole file is mapped at once in memory 4 A call to CloseHandle to release the file The PInvoke interface to the required functions involves simple type mappings as is usual for Win32 API functions All the functions are in kernel32dll, and the signature can be found in the Windows SDK Listing 17-1 contains the definition of the F# wrapper for memory mapping.

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