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    <p>The "Run" looks to be a non-static class method. Although, it's possible to call such methods from C# this is not the primary use-case. It would be way easier to consume it from .NET if you expose it via COM, or at-least as a plain C interface:</p> <pre> <code> extern "C" __declspec(dllexport) void* Testing_Test_Create(); extern "C" __declspec(dllexport) void Testing_Test_Destroy(void* self); extern "C" __declspec(dllexport) int Testing_Test_Run(void* self, char* filePath, bool bEntry, double duration); </code> </pre> <p>And here is a sample how to call C++ class methods from C#:</p> <pre> <code> // Test.cpp in NativeLib.dll namespace Testing { class __declspec(dllexport) Test { public: explicit Test(int data) : data(data) { } int Run(char const * path) { return this-&gt;data + strlen(path); } private: int data; }; } </code> </pre> <pre> <code> // Program.cs in CSharpClient.exe class Program { [DllImport( "NativeLib.dll", EntryPoint = "??0Test@Testing@@QAE@H@Z", CallingConvention = CallingConvention.ThisCall, CharSet = CharSet.Ansi)] public static extern void TestingTestCtor(IntPtr self, int data); [DllImport( "NativeLib.dll", EntryPoint = "?Run@Test@Testing@@QAEHPBD@Z", CallingConvention = CallingConvention.ThisCall, CharSet = CharSet.Ansi)] public static extern int TestingTestRun(IntPtr self, string path); static void Main(string[] args) { var test = Marshal.AllocCoTaskMem(4); TestingTestCtor(test, 10); var result = TestingTestRun(test, "path"); Console.WriteLine(result); Marshal.FreeCoTaskMem(test); } } </code> </pre> <p>Entry point names might be different for your build configuration/compiler, so use dumpbin utility to obtain them. Again, this is just a proof of concept, in real code it would be better to use COM.</p>
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    1. COI have added extern "C" __declspec(dllexport) in the header file but I get the error message at compile time: Command line error D8016 : '/GL' and '/ZI' command-line options are incompatible cl
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    2. COThat disappeared after setting Whole Optimization in Project's properties to "No" but now I get the error message: 'extern' storage-class specifier illegal on members
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    3. COI am still interested in how you claim `it's possible to call such methods from C#` other than COM, plain C or a static C++ function.
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