unit hellofun;

interface

function getint():integer;stdcall;
function sayhello(var sname:PAnsiChar):PAnsiChar;stdcall;

implementation

function getint():integer;stdcall;
begin
  result:=888;
end;

function sayhello(var sname:PAnsiChar):PAnsiChar;stdcall;
begin
  sname:='ok!';
  result:='hello,garfield !';
end;


end.

library hello;

{ Important note about DLL memory management: ShareMem must be the
  first unit in your library's USES clause AND your project's (select
  Project-View Source) USES clause if your DLL exports any procedures or
  functions that pass strings as parameters or function results. This
  applies to all strings passed to and from your DLL--even those that
  are nested in records and classes. ShareMem is the interface unit to
  the BORLNDMM.DLL shared memory manager, which must be deployed along
  with your DLL. To avoid using BORLNDMM.DLL, pass string information
  using PChar or ShortString parameters. }

uses
  System.SysUtils,
  System.Classes,
  hellofun in 'hellofun.pas';

{$R *.res}

exports
  getint,
  sayhello;

begin
end.

import ctypes


def main():
    dll=ctypes.windll.LoadLibrary("hello.dll")
    ri=dll.getint()
    print(ri)

    s=ctypes.c_char_p()
    rs=ctypes.c_char_p()
    rs=dll.sayhello(ctypes.byref(s))
    print(s)
    print(ctypes.c_char_p(rs))

if __name__ == '__main__':
    main()

>>> 
888
c_char_p(b'ok!')
c_char_p(b'hello,garfield !')
>>>