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POcreating C .dll and using it in C#
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copied!<p>As a C# developper I'm trying to learn some C now. It seemed me fun to create a C dll and then use the functions I created in a C# project, just to get familiar with the language.</p> <p>For developping the c dll I use DEV-C++ and obviously for C# Visual Studio.</p> <p>This is what I've come up with so far:</p> <p>C</p> <pre><code>#include <windows.h> #include <stdio.h> #include <stdlib.h> #define NAG_CALL __stdcall #define NAG_DLL_EXPIMP __declspec(dllexport) NAG_DLL_EXPIMP void NAG_CALL Scalars(double, double*); NAG_DLL_EXPIMP void NAG_CALL Scalars(double in, double *out) { *out = in; } </code></pre> <p>And in C#</p> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Runtime.InteropServices; namespace TestMyOwnCDLL { public static class MyCDLLWrapper { [DllImport("TestDLL1.dll")] private static extern void Scalars(double invar, ref double outvar); public static double CallScalars(double invar) { double outvar = (double)0.0; Scalars(invar, ref outvar); return outvar; } } } </code></pre> <p>I've added TastDLL1.dll to the assembly and marked 'Always copy'. However, when calling the function i get a BadImageFormatException. This means that the dll is found but it can't execute the dll for some reason.</p> <p>Any ideas? I've used the examples from: <a href="http://www.drdobbs.com/cpp/calling-c-library-dlls-from-c/184406285" rel="nofollow">http://www.drdobbs.com/cpp/calling-c-library-dlls-from-c/184406285</a></p> <p>Kind regards.</p>

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