Delphi单元如下（输出hello.dll）：

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.

python中调用如下：

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()

运行Python，输出如下：

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

好了，我们可以让python完成部分功能在Delphi中调用，也可以用Delphi完成部分功能在Python中调用。

Python调用delhpi xe2开放的dll 的例子下载，有输入参数，输出参数和返回值。

具体下载目录在 /2013年资料/6月/12日/Python调用Delphi写的dll