Open the file for random access operations. Returns a
Future<RandomAccessFile> that completes with the opened
random access file. RandomAccessFiles must be closed using the
RandomAccessFile.close method.
Files can be opened in three modes:
FileMode.READ: open the file for reading.
FileMode.WRITE: open the file for both reading and writing and truncate the file to length zero. If the file does not exist the file is created.
FileMode.APPEND: same as FileMode.WRITE except that the file is
not truncated.
Source
Future<RandomAccessFile> open({FileMode mode: FileMode.READ});