# open method

Future<RandomAccessFile> open ({FileMode mode: FileMode.read })

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.

## Implementation

    Future<RandomAccessFile> open({FileMode mode: FileMode.read});