//***************************************************************
// From the book "Win32 System Services: The Heart of Windows 98
// and Windows 2000"
// by Marshall Brain
// Published by Prentice Hall
//
// Copyright 1995, by Prentice Hall.
//
// This code demonstrates a mapped file.
//***************************************************************

// mapfile.cpp

#include <windows.h>
#include <iostream.h>

void main()
{
	HANDLE fileHandle;
	char filename[MAX_PATH];
	HANDLE mapFileHandle;
	char *mapView;

	// get the file name
	cout << "Enter filename: ";
	cin >> filename;

	// open the file
	fileHandle = CreateFile(filename,
		GENERIC_READ, 0,
		0, OPEN_EXISTING, 0, 0);
	if (fileHandle == INVALID_HANDLE_VALUE)
	{
		cout << "Error number " << GetLastError()
			<< endl;
		return;
	}

	// create the mapping 
	mapFileHandle = CreateFileMapping(
		fileHandle, 0, PAGE_READONLY,
		0, 0, "mapfile");
	if (mapFileHandle <= 0)
	{
		cout << "Mapping error "
			<< GetLastError() << endl;
		return;
	}

	// map the file to an address
	mapView = (char *) 
		MapViewOfFile(mapFileHandle, 
		FILE_MAP_READ, 0, 0, 0);

	// dump the file
	cout << mapView;

	// clean up
	if (!UnmapViewOfFile(mapView))
		cout << "problem unmapping\n";
	CloseHandle(mapFileHandle);
	CloseHandle(fileHandle);  
}