There are two methods of finding and setting the stream position,
stream positioning and seeking. The current position of the
read/write pointer in a specified stream can be obtained by using
stream_position/2. It may be changed by using
seek/4 may be used.
Seeking is more general, and stream positioning is more portable. The differences between them are:
stream_position/2is equivalent to
seek/4with Offset = 0, and Method =
stream_position/3asks for stream position objects,
seek/4uses integer expressions to represent the position or offset. Stream position objects are obtained by calling
stream_position/[2,3], and are discussed in the reference page.
seek/4is supported only on certain operating systems.