function GetDriverType(Path: Pchar): UINT;stdcall;external 'kernel32.dll' name 'GetDriveTypeA';
return value:
DRIVE_UNKNOWN The drive type cannot be determined.
DRIVE_NO_ROOT_DIR The root directory does not exist.
DRIVE_REMOVABLE The disk can be removed from the drive.
DRIVE_FIXED The disk cannot be removed from the drive.
DRIVE_REMOTE The drive is a remote (network) drive.
DRIVE_CDROM The drive is a CD-ROM drive.
DRIVE_RAMDISK The drive is a RAM disk.
DRIVE_UNKNOWN是0，下面依次递增。
例如： GetDriverType('c:') = 3
