[C++]File Memory Mapping - 대용량 파일 입출력 처리

#include <windows.h>
#include <stdio.h>
 
int main(int argc, char **argv)
{
  HANDLE hFile, hMapFile;
  DWORD dwFileSize;
  char *pFile, *pFileTemp;
 
  hFile = CreateFile( "test.txt", GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
  // hFile = CreateFile( "test.txt", GENERIC_READ, FILESHARE_READ, NULL, OPEN_EXISTING, 0, NULL); // 읽기
 
  dwFileSize = GetFileSize( hFile, NULL );
 
  hMapFile = CreateFileMapping( hFile, NULL, PAGE_READWRITE, 0, 0, NULL );
  // hMapFile = CreateFileMapping( hFile, NULL, PAGE_READONLY, 0, 0, NULL );    // 읽기
 
  if( hMapFile == NULL )
  {
    printf( "CreateFileMapping() fail" );
    CloseHandle( hFile );
    return 1;
  }
 
  pFile = (char*)MapViewOfFile( hMapFile, FILE_MAP_ALL_ACCESS, 0, 0, 0 );
  //pFile = (char*)MapViewOfFile( hMapFile, FILE_MAP_READ, 0, 0, 0 );
 
 
  // Do SomeThing...
  pFileTemp = pFile;
 
  for(UINT i = 0; i < dwFileSize; i++ )
  {
    *pFileTemp = (*pFileTemp + 1);
    pFileTemp++;
  }
  // SomeThing End..
 
 
  //메모리 내용을 강제로 파일에 쓴다.
  FlushViewOfFile( pFile, 0 );
 
  UnmapViewOfFile( pFile );
  CloseHandle( hMapFile );
  CloseHandle( hFile );
 
  return 0;
}