请教Ctypes调用dll问题

dll，很简单，2个函数代码如下：

library Project1; { 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   SysUtils,   Classes; {$R *.RES} function PlusNum(x,y:integer):integer;stdcall; begin      result:=x+y; end; function MinusNum(x,y:integer):integer;stdcall; begin      result:=x-y; end; exports PlusNum index 1, MinusNum index 2; begin end.

在python shell里这样调用
mydll=ctypes.cdll.LoadLibrary('project1.dll')
mydll.PlusNum(1,2)

提示出错，请问该如何调用？
Traceback (most recent call last):
  File "<interactive input>", line 1, in <module>
ValueError: Procedure called with not enough arguments (8 bytes missing) or wrong calling convention
>>>

CDLL, WinDLL 调用传递的参数是有区别的。

CDLL ,WinDLL ，能否介绍下区别？使用方法？

我上面的DLL用WinDLL可以使用。谢谢

参数传递是从左到右， 还是从右到左，还有压栈的参数的处理， 具体的用GOOGLE 查查。

简单的说就是CDLL针对cdecl的函数调用方式，WinDLL针对stdcall的函数调用方式，因为windows api大部分都是__stdcall的

http://blog.chinaunix.net/u/6123/showart_347700.html