unit Unit1;  //單元文件名 
interface   //這是接口關鍵字，用它來標識文件所調用的單元文件 
uses     //程序用到的公共單元 
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs; 

type     //這里定義了程序所用的組件，一些類，以及組件所對應的過程、事件 
TForm1 = class(TForm) 
private   //定義私有變量和私有過程 
  { Private declarations }
public   //定義公共變量和公共過程 
  { Public declarations }
end; 
  
var      //定義程序使用的公共變量 
Form1: TForm1; 

implementation //程序代碼實現(xiàn)部分 

{$R *.dfm}
  
end. 

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 !')
>>>