// FileHandle.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"

#undef UNICODE
#include <windows.h>

#include <iostream>
using namespace std;

int _tmain(int argc, _TCHAR* argv[])
{
	HANDLE f;

	f = CreateFile
		("C:\\Temp\\abc.txt", // lpFileName,
          GENERIC_READ | GENERIC_WRITE, // dwDesiredAccess,
          0, // dwShareMode,
          NULL, // lpSecurityAttributes,
          CREATE_ALWAYS, // dwCreationDisposition,
          0, // dwFlagsAndAttributes,
          NULL); // hTemplateFile

	if (f == INVALID_HANDLE_VALUE)
	{
		cout << "Chyba pri otvirani" << GetLastError () << endl;
	}
	else
	{
		HANDLE m;
		m = CreateFileMapping (f,
                               NULL, // lpSecurityAttributes,
							   PAGE_READWRITE,
							   0, // size high
							   16*1024, // size low
							   NULL); // name
		if (m == NULL)
  		   cout << "Chyba pri zobrazeni" << GetLastError () << endl;
		else
		{
  		   cout << "Zobrazeno" << endl;
		   void * p = MapViewOfFile (m,
			                         FILE_MAP_READ | FILE_MAP_WRITE,
   							         0, // pos high
							         0, // pos low
									 8*1024); // size
		   if (p == NULL)
    		   cout << "Chyba pri MapView" << GetLastError () << endl;
		   else
		   {
    		   cout << "Mam ukazatel" << endl;
			   char * c = (char *) p;
			   c[0] = 'A';
			   c[1] = 'B';
			   c[2] = 'C';
			   UnmapViewOfFile (p);
		   }

 		   CloseHandle (m);
		}
			 

		/*
		char data [80] = "Hello from CreateFile";
		int len = strlen (data);
		BOOL ok;
		DWORD answer;

		ok = WriteFile (f, data, len, &answer, NULL);
		if (ok && answer == len)
			cout << "Zapis se povedl" << endl;
		else
			cout << "Chyba pri zapisu" << endl;
	
		SetFilePointer (f, 0, NULL, FILE_BEGIN);

		char data2 [80];
		int len2 = sizeof (data2) - 1;
		ok = ReadFile (f, data2, len2, &answer, NULL);
		if (ok)
		{
			data2 [answer] = 0;
			cout << "Data: " << data2 << endl;
		}
		else
			cout << "Chyba pri cteni" << endl;
	    */

		CloseHandle (f);
	}

    cout << "O.K." << endl;
	char s [80];
	cin >> s;

	return 0;
}