How do I call unmanaged C/C++ code from a C# ASP.NET webpage

Question

I have an ASP.NET website that uses C# and I'd like to call functions from an unmanaged C/C++ DLL. How do I do it?

Answer 1

1. create an unmanaged dll:

    extern "C" __declspec(dllexport) __cdecl int sum(int a,int b); ----> 

2. create a namespace/class to DllImport the above DLL

    using System.Runtime.InteropServices; namespace ImportDLL { public class importdll { public importdll() { } DllImport("mysum.dll", EntryPoint="sum", ExactSpelling=false, CallingConvention = CallingConvention.Cdecl)] public extern int myfun(int a, int b); } } 

3. create a aspx code behind

    using ImportDLL; namespace TEST { public int my_result; protected importdll imp = new importdll(); my_result = imp.myfun(1,1); } 

Answer 2

Check out P/Invoke.

Calling Win32 DLLs in C# with P/Invoke

If it's a COM dll, then you can use COM Interop

Answer 3

只需添加pinvoke.net就可以满足您的Win32需求。