// Windows 2000以降でOK(9xではバッファは減らしましょう)

#include <windows.h>
#include <tchar.h>

#include <shlwapi.h>

BOOL IsNTFS ( const _TCHAR *pszRootPath )
{
    enum
    {
        MY_MAX_BUFFER = 2048
    };
    _TCHAR szFileSystem[ MY_MAX_BUFFER ];
    memset ( szFileSystem, 0, sizeof ( szFileSystem ) );
    if ( 0 != GetVolumeInformation ( pszRootPath,
        NULL,
        0,
        NULL,
        NULL,
        NULL,
        szFileSystem,
        MY_MAX_BUFFER ) )
    {
        _TCHAR *p = StrStrI ( szFileSystem, _TEXT ( "NTFS" ) );
        if ( 0 != p )
        {
            return TRUE;
        }
    }
    return FALSE;
}

int WINAPI _tWinMain ( HINSTANCE,
    HINSTANCE,
    _TCHAR *,
    int )
{
    // ドライブのルートパスを順に列挙 "C:\\<NULL>D:\\<NULL>...Z:\\<NULL><NULL>"
    DWORD dwDrivesSize = GetLogicalDriveStrings ( 0, NULL );
    _TCHAR *pszDrives = new _TCHAR[ dwDrivesSize + 1 ];
    GetLogicalDriveStrings ( dwDrivesSize, pszDrives );
    _TCHAR *p = pszDrives;
    while ( '\0' != *p )
    {
        // そのドライブが NTFS か？
        if ( IsNTFS ( p ) )
        {
            MessageBox ( NULL,
                _TEXT ( "NTFSです" ),
                p,
                MB_OK );
        }
        else
        {
            MessageBox ( NULL,
                _TEXT ( "NTFSではありません" ),
                p,
                MB_OK );
        }

        p += lstrlen ( p ) + 1;
    }

    return 0;
}