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The SetLastError parameter informs the runtime that the called function uses the Windows mechanism for error reporting and that the GetLastError function can be read in case of error; otherwise, the CLR ignores such a value The CharSet parameter indicates the character set assumed, and it is used to distinguish between ANSI and Unicode characters; with Auto, you delegate the runtime to decide the appropriate version You can define the generic class MemMap that uses the functions to map a given file into memory The goal of the class is to provide access to memory mapping in a system where memory is not directly accessible because the runtime is responsible for its management A natural programming abstraction to expose the memory to F# code is to provide an array-like interface where the memory is seen as a homogeneous array of values Listing 17-1.

To normalize data in one or more existing data tables, do the following: 1. Identify data fields with repeating data values or multipart data values (for example, contact name and address data values or product name and manufacturer data values contained in the same data field). Break these data values into multiple data fields (for example, separate data fields for name, address, product name, or manufacturer data values). 2. Group data fields with related data values into separate data tables (for example, a data table for contacts, a data table for products, or a data table for manufacturers). 3. Eliminate repeating data values in each data table (for example, a repeated address or a repeated product name). 4. Assign a primary key data field to each data table and a unique identifier for each data record in that data table (for example, a unique contact identification number or a unique product part number). 5. Add foreign key data fields as needed to cross-reference related data records contained in multiple data tables (for example, foreign key data fields describing the relationships between products and manufacturers, cross-referencing primary key data values in the separate product and manufacturer data tables). 6. Create additional data tables and use foreign keys as needed to store data records containing unique facts and figures (for example, a product sales transaction data table containing individual sales transaction details, cross-referencing primary key data values in the product/manufacturer data table).

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Exposing Memory Mapping in F# #light module MMap =.

type HANDLE = nativeint type ADDR = nativeint [<DllImport("kernel32", SetLastError=true)>] extern bool CloseHandle(HANDLE handler) [<DllImport("kernel32", SetLastError=true, CharSet=CharSet.Auto)>] extern HANDLE CreateFile(string lpFileName, int dwDesiredAccess, int dwShareMode, HANDLE lpSecurityAttributes, int dwCreationDisposition, int dwFlagsAndAttributes, HANDLE hTemplateFile) [<DllImport("kernel32", SetLastError=true, CharSet=CharSet.Auto)>] extern HANDLE CreateFileMapping(HANDLE hFile, HANDLE lpAttributes, int flProtect, int dwMaximumSizeLow, int dwMaximumSizeHigh, string lpName) [<DllImport("kernel32", SetLastError=true)>] extern ADDR MapViewOfFile(HANDLE hFileMappingObject, int dwDesiredAccess, int dwFileOffsetHigh, int dwFileOffsetLow, int dwNumBytesToMap) [<DllImport("kernel32", SetLastError=true, CharSet=CharSet.Auto)>] extern HANDLE OpenFileMapping(int dwDesiredAccess, bool bInheritHandle, string lpName) [<DllImport("kernel32", SetLastError=true)>] extern bool UnmapViewOfFile(ADDR lpBaseAddress) let INVALID_HANDLE = new IntPtr(-1) let MAP_READ = 0x0004 let GENERIC_READ = 0x80000000

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