急请教一个PYTHON调DLL的问题

visa32.dll 是一个C#的库
public static extern int viFindRsrc(int sesn, string expr, out int vi, out int retCount, StringBuilder desc);

我想在PYTHON中调用这个函数怎么调用呢?

我尝试
>>> from ctypes import *
>>> visa=cdll.LoadLibrary("visa32.dll")

可是调用这个函数时老是说:
ValueError: Procedure called with not enough arguments (20 bytes missing) or wrong calling convention

C# 写的库用 IRONPYTHON 调用会很方便 http://www.codeplex.com/ironpython