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POUsing ctypes in python to access a C# dll's methods
 

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  1. POUsing ctypes in python to access a C# dll's methods
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    <p>I would like to implement C# code in a critical part of my python program to make it faster. It says (on Python documentation and <a href="http://www.knowledgetantra.com/component/content/article/2-python/1-call-dll-function-in-python.html]" rel="noreferrer">this site</a>) that you can load a Dynamic Link Library (and so say the PyDocs) as follows: </p> <p><code>cdll.LoadLibrary("your-dll-goes-here.dll")</code></p> <p>This is the part of my code that takes care of this feature:</p> <pre><code>from ctypes import * z = [0.0,0.0] c = [LEFT+x*(RIGHT-LEFT)/self.size, UP+y*(DOWN-UP)/self.size] M = 2.0 iterator = cdll.LoadLibrary("RECERCATOOLS.dll") array_result = iterator.Program.ITERATE(z[0],z[1],c[0],c[1],self.iterations,M) z = complex(array_result[0],array_result[1]) c = complex(array_result[2],array_result[3]) last_iteration = int(round(array_result[4])) </code></pre> <p>And the RECERCATOOLS.dll that I use is this (C# code, not C or C++):</p> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Text; using KarlsTools; public class Program { public static Array ITERATE(double z_r,double z_i,double c_r, double c_i, int iterations, double limit) { Complex z = new Complex(z_r, z_i); Complex c = new Complex(c_r, c_i); for (double i = 1; Math.Round(i) &lt;= iterations; i++) { z = Complex.Pow(z, 2) + c; if (Complex.Abs(z) &lt; limit) { double[] numbers = new double[] { Complex.Real(z), Complex.Imag(z), Complex.Real(c), Complex.Imag(c), i}; return numbers; } } double iter = iterations; double[] result = new double[] { Complex.Real(z), Complex.Imag(z), Complex.Real(c), Complex.Imag(c), iter}; return result; } } </code></pre> <p>To build this DLL I use "Build" command over the Visual Studio 2010 project, which only contains this file and a reference to "Karlstools", a module that allows me to use complex numbers.</p> <p>I don't know why but when I try to run my Python code, it just throws an exception:</p> <pre><code> [...] array_result = iterator.Program.ITERATE(z[0],z[1],c[0],c[1],self.iterations,M) File "C:\Python32\lib\ctypes\__init__.py", line 353, in __getattr__ func = self.__getitem__(name) File "C:\Python32\lib\ctypes\__init__.py", line 358, in __getitem__ func = self._FuncPtr((name_or_ordinal, self)) AttributeError: function 'Program' not found </code></pre> <p>I need help with this, since it keeps throwing me exceptions even with everything is set to <code>public</code> and the function as <code>static</code>, or even when if I try to access the function directly without specifying the "Program" class... I have no clue where the problem could be.</p>
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    1. CO[Unmanaged Exports](https://sites.google.com/site/robertgiesecke/Home/uploads/unmanagedexports). [Exporting Managed code as Unmanaged](http://www.csharphelp.com/2007/03/exporting-managed-code-as-unmanaged) (2007).
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