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?

Vinay · Accepted Answer · 2009-04-06 01:33:09Z

10

create an unmanaged dll:

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

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);
}
}

create a aspx code behind

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

answered Apr 6, 2009 at 1:33

Vinay

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Comments

wovano · Accepted Answer · 2022-10-18 10:39:21Z

5

Check out P/Invoke.

Calling Win32 DLLs in C# with P/Invoke

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

edited Oct 18, 2022 at 10:39

wovano

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answered Apr 6, 2009 at 1:31

J.W.

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Comments

kenny · Accepted Answer · 2010-06-03 14:52:43Z

0

Just adding that pinvoke.net is a great wiki/resource for your Win32 needs.

answered Jun 3, 2010 at 14:52

kenny

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