Question

I want to be able to pass in a string – list – into a C node for Erlang and return back a string to the Erlang process after some computation.

result = function(input_string),

where input_string is of type ETERM *

My computation on the string uses char * variables for strings.

Please let me know if this is sufficient information to go on.

[The C node example in the erl_interface tutorial uses integer input to and output from the C node]

TIA,
BR,
Shailen

Answer 1

Use erl_iolist_to_string for input (every Erlang “string” is also an iolist).

Use erl_mk_string instead of erl_mk_int for output.

http://erlang.org/doc/man/erl_eterm.html#erl_iolist_to_string

http://erlang.org/doc/man/erl_eterm.html#erl_mk_string