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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
or stream_property/2
. It may be changed by using
set_stream_position/2
. Alternatively, seek/4
may be used.
Seeking is more general, and stream positioning is more portable. The differences between them are:
stream_position/2
is similar to seek/4
with Offset = 0,
and Method = current
.
set_stream_position/2
asks for stream position objects,
seek/4
uses integer expressions to represent the position or
offset. Stream position objects are obtained by calling
stream_position/2
, and are discussed in the reference page.