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POWriting C++ .dlls and access them Unity-3D
 

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  1. POWriting C++ .dlls and access them Unity-3D
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    <p>I have been writing a basic dll in c++ with the end-goal of accessing some of it's methods in Unity. I started this tutorial in : <a href="http://docs.unity3d.com/Documentation/Manual/Plugins.html" rel="nofollow">http://docs.unity3d.com/Documentation/Manual/Plugins.html</a> which helped me understand the concept but after I write the class in Unity and access the .dll it throws me an entry point exception error when I hit play. And yes, I have a plugin folder where i keep my .dll file. </p> <blockquote> <p>EntryPointNotFoundException: addition PluginImport.Start () (at Assets/Test/PluginImport.cs:20)</p> </blockquote> <p>Here is my .dll class. </p> <p>The Header File:</p> <pre><code>#ifndef MATHASSISTANT_ARITHMETICS_ARITHMETIC_H #define MATHASSISTANT_ARITHMETICS_ARITHMETIC_H namespace ma{ extern "C" { class Arithmetic { public: Arithmetic();//ctor protected: virtual ~Arithmetic();//dtor public: static __declspec(dllexport) float addition(float&amp; val_1, float&amp; val_2); static __declspec(dllexport) float substraction(float&amp; val_1, float&amp; val_2); static __declspec(dllexport) float multiplication(float&amp; val_1, float&amp; val_2); static __declspec(dllexport) float division(float&amp; val_1, float&amp; val_2); }; } } #endif </code></pre> <p>This is the source file:</p> <pre><code>#include "Arithmetic.h" #include &lt;stdexcept&gt; namespace ma{ Arithmetic::Arithmetic(){ //TODO: Initialize items here } Arithmetic::~Arithmetic(){ //TODO: Release unused items here } //FUNCTION: adds two values float Arithmetic::addition(float&amp; val_1, float&amp; val_2){ return val_1 + val_2; } //FUNCTION: substracts two values float Arithmetic::substraction(float&amp; val_1, float&amp; val_2){ return val_1 - val_2; } //FUNCTION: multiplies two values float Arithmetic::multiplication(float&amp; val_1, float&amp; val_2){ return val_1 * val_2; } //FUNCTION: divide two values float Arithmetic::division(float&amp; val_1, float&amp; val_2){ if(val_2 == 0) throw new std::invalid_argument("denominator cannot be 0"); return val_1 / val_2; } } </code></pre> <p>This is the class I created in Unity3D:</p> <pre><code>using UnityEngine; using System.Collections; using System; using System.Runtime.InteropServices; public class PluginImport : MonoBehaviour { //Lets make our calls from the Plugin [DllImport("Arithmetic")] private static extern float addition(float val_1, float val_2); [DllImport("Arithmetic")] private static extern float substraction(float val_1, float val_2); [DllImport("Arithmetic")] private static extern float multiplication(float val_1, float val_2); [DllImport("Arithmetic")] private static extern float division(float val_1, float val_2); void Start() { Debug.Log(addition(5, 5)); Debug.Log(substraction(10, 5)); Debug.Log(multiplication(2, 5)); Debug.Log(division(10, 2)); } } </code></pre> <p>If anyone can help me find what I am doing wrong I will be most appreciative. Thanks in advance!</p>
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    1. USManuel Mangual
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    1. COhttp://stackoverflow.com/questions/11619986/c-plugin-for-unity-entrypointnotfoundexeption
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      1. POWriting C++ .dlls and access them Unity-3D
      1. USRetired Ninja
    2. CO@RetiredNinja Great source but it didn't help with my issue. I still get the `EntryPointNotFound: addition` error.
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