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    <p>The example will be, for <em>Linux</em>:</p> <p>1) Create a <code>C</code> file, <code>libtest.c</code> with this content:</p> <pre><code>#include &lt;stdio.h&gt; void print(const char *message) { printf("%s\\n", message); } </code></pre> <p>That’s a simple pseudo-wrapper for printf. But represents any <code>C</code> function in the library you want to call. If you have a <code>C++</code> function don’t forget to put extern <code>C</code> to avoid mangling the name.</p> <p>2) create the <code>C#</code> file</p> <pre><code>using System; using System.Runtime.InteropServices; public class Tester { [DllImport("libtest.so", EntryPoint="print")] static extern void print(string message); public static void Main(string[] args) { print("Hello World C# =&gt; C++"); } } </code></pre> <p>3) Unless you have the library libtest.so in a standard library path like “/usr/lib”, you are likely to see a System.DllNotFoundException, to fix this you can move your libtest.so to /usr/lib, or better yet, just add your CWD to the library path: <code>export LD_LIBRARY_PATH=pwd</code></p> <p>credits from <a href="http://www.moythreads.com/wordpress/2008/02/04/pinvoke-how-to-call-c-from-c/">here</a></p> <p><strong>EDIT</strong></p> <p>For <em>Windows</em>, it's not much different. Taking an example from <a href="http://www.codeproject.com/Articles/6912/Calling-methods-from-Dll-compiled-in-C-from-C">here</a>, you only have yo enclose in your <code>*.cpp</code> file your method with <code>extern "C"</code> Something like</p> <pre><code>extern "C" { //Note: must use __declspec(dllexport) to make (export) methods as 'public' __declspec(dllexport) void DoSomethingInC(unsigned short int ExampleParam, unsigned char AnotherExampleParam) { printf("You called method DoSomethingInC(), You passed in %d and %c\n\r", ExampleParam, AnotherExampleParam); } }//End 'extern "C"' to prevent name mangling </code></pre> <p>then, compile, and in your C# file do</p> <pre><code>[DllImport("C_DLL_with_Csharp.dll", EntryPoint="DoSomethingInC")] public static extern void DoSomethingInC(ushort ExampleParam, char AnotherExampleParam); </code></pre> <p>and then just use it:</p> <pre><code>using System; using System.Runtime.InteropServices; public class Tester { [DllImport("C_DLL_with_Csharp.dll", EntryPoint="DoSomethingInC")] public static extern void DoSomethingInC(ushort ExampleParam, char AnotherExampleParam); public static void Main(string[] args) { ushort var1 = 2; char var2 = ''; DoSomethingInC(var1, var2); } } </code></pre>
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    1. POIs it possible to call a C function from C#.Net
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    1. COGood example! This is a very good example of using Interop. It's obviously Linux (not Windows), but the principle is the same. This is *EXACTLY* the approach I'd recommend to the OP.
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    2. COCould some one edit the answer? I got problems with the include, doesn't show stdio.h
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    3. CO@paulsm4 thanks for the edit !!
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