addressbook.rb

module MyLibrary
extend FFI::Library
ffi_lib "./addressbook.so"


attach_function :writeAddressbook,
 [], :pointer
attach_function :readAddressbook, [], [:pointer],:void
end

my app.rb

require 'ffi'
require 'addressbook'

Alice = AddressBook.write_address_book();
AddressBook.read_Id( Alice );
AddressBook.read_name( Alice );
AddressBook.read_email( Alice );
AddressBook.read_phone.on(Alice);
AddressBook.read_phone.type(Alice);
AddressBook.read_employmentschool(Alice);

Bob = AddressBook.write_address_book();
AddressBook.read_Id( Bob );
AddressBook.read_name( Bob );
AddressBook.read_email( Bob );
AddressBook.read_phone.on(Bob);
AddressBook.read_phone.type(Bob);
AddressBook.read_employmentschool(Bob);

ls: cannot access ?pp: No such file or directory
rm: missing operand
Try 'rm --help' for more information.
ls: cannot access *?pp: No such file or directory
Testing ...
/usr/lib/jruby//lib/ruby/site_ruby/shared/ffi/library.rb:28:in ffi_lib': Could not open library './addressbook.so' : ./addressbook.so: cannot open shared object file: No such file or directory (LoadError) from /usr/lib/jruby//lib/ruby/site_ruby/shared/ffi/library.rb:10:inmap'
from /usr/lib/jruby//lib/ruby/site_ruby/shared/ffi/library.rb:10:in ffi_lib' from ./addressbook.rb:3 from ./addressbook.rb:3:inrequire'
from myapp.rb:3
make: ** [main] Error 1