Returns the size of the file.
The size of the file in bytes.
Use this method to retrieve the file size. This method attempts to use SIZE and MLST commands if available, otherwise reverts to LIST command.
General rule is that you specify only the name of the file, which should reside in current directory. If you need to check the file with path, change the directory using CWD command before calling this method. Behavior of the method in case when AFilename contains a path is undefined (server-dependent).