使用Python访问C#dll中存在的函数 [英] Access a function present in C# dll using Python

问题描述

我想访问存在于c#文件中的函数 my_function()，该函数已编译为.net dll- abc.dll .

I want to access a function my_function() present in a c# file which is compiled into a .net dll - abc.dll.

C#文件

            using System;
            using System.Collections.Generic;
            using System.Linq;
            using System.Text;
            using System.Threading.Tasks;


            namespace Test
            {
                public class Class1
                {
                    public string my_function()
                    {
                        return "Hello World.. :-";
                    }
                }
            }

将上面的代码编译为abc.dll后

After compiling the above code to abc.dll

使用下面的python尝试访问my_function()

            import ctypes
            lib = ctypes.WinDLL('abc.dll')
            print lib.my_function()

以上代码会引发错误

lib.my_function()追溯(最近一次通话):文件"，第1行，在 getattr 中的文件"C:\ Anaconda \ lib \ ctypes__init __.py"，行378func = self.获取项(名称) getitem 中的文件"C:\ Anaconda \ lib \ ctypes__init __.py"，第383行func = self._FuncPtr((name_or_ordinal，self))AttributeError:找不到函数"my_function"

lib.my_function() Traceback (most recent call last): File "", line 1, in File "C:\Anaconda\lib\ctypes__init__.py", line 378, in getattr func = self.getitem(name) File "C:\Anaconda\lib\ctypes__init__.py", line 383, in getitem func = self._FuncPtr((name_or_ordinal, self)) AttributeError: function 'my_function' not found

推荐答案

您尚未使该函数在DLL中可见.

You haven't made the function visible in the DLL.

有几种不同的方法可以执行此操作.最简单的方法可能是使用 unmanagedexports 程序包.它允许您通过使用[DllExport]属性装饰函数(例如P/Invoke的DllImport)来直接调用C#函数，就像调用普通C函数一样.它使用了子系统的一部分，旨在使C ++/CLI混合托管库正常工作.

There are a few different ways you can do this. The easiest is probably to use the unmanagedexports package. It allows you to call C# functions directly like normal C functions by decorating your function with [DllExport] attribute, like P/Invoke's DllImport. It uses part of the subsystem meant to make C++/CLI mixed managed libraries work.

C#代码

class Example
{
     [DllExport("ExampleFunction", CallingConvention = CallingConvention.StdCall)]
     public static int ExampleFunction(int a, int b)
     {
         return a + b;
     } 
}

Python

import ctypes
lib = ctypes.WinDLL('example.dll')
print lib.ExampleFunction(12, 34)

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