python调用Delphi写的Dll代码示例

首先看下Delphi单元文件基本结构：

unit Unit1;  //单元文件名 
interface   //这是接口关键字，用它来标识文件所调用的单元文件 
uses     //程序用到的公共单元 
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs; 

type     //这里定义了程序所用的组件，一些类，以及组件所对应的过程、事件 
TForm1 = class(TForm) 
private   //定义私有变量和私有过程 
  { Private declarations }
public   //定义公共变量和公共过程 
  { Public declarations }
end; 
  
var      //定义程序使用的公共变量 
Form1: TForm1; 

implementation //程序代码实现部分 

{$R *.dfm}
  
end.

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。

以上程序在DelphiXE2及Python3.2中调试通过。

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