CreateFileMapping or MapViewOfFileEx example

#include <windows.h> 
#include <string> 
#include <winbase.h> 
#include <iostream> 
using namespace std;

void main()
{
	HANDLE  h;

	CHAR *filename;
 
	filename =new CHAR[2500];
	wcout<<"enter the file name:";
	cin.getline (filename,2500);
	h= CreateFile( filename,GENERIC_READ,FILE_SHARE_READ,NULL,OPEN_EXISTING,FILE_FLAG_SEQUENTIAL_SCAN,NULL);
	cout<<filename;
	if (h!=INVALID_HANDLE_VALUE)
	{
	printf("\nFile is opened/created");
	DWORD size = GetFileSize(h, NULL);
	HANDLE hFileMapping = CreateFileMapping(h, NULL,PAGE_READONLY, 0, 0, NULL);	
	
	CloseHandle(h);

	MapViewOfFileEx(hFileMapping, FILE_MAP_READ, 0,  0,0,NULL);           
		system("Pause");

	UnmapViewOfFile(hFileMapping);
	
	}
	else
	{
	printf("\nUnable to open or create file");
	}
	system ("pause");

}