Looking for examples of creating a custom DLL for cuda and to use it in C#

Accelerated Computing CUDA CUDA Programming and Performance
1

Hello everyone,

I am currently looking for examples of creating a DLL using CUDA and using it in a C# project in Visual Studios 2010.

I thought I did it correctly but I’m not having any good luck.

What I did was copy out the template project from the example and gotten cuda to do what I needed in it.

Right now is just trying to get my c# class to use the dll even as a test.

=------

//CudaWrapper.cs

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Runtime.InteropServices;

namespace CudaDllTest

{

    class CudaWrapper{

        [DllImport("CudaCodes.dll")]

public static extern int _DllTest();

        int nTester = 5;

//strctres

        public void dllRun()

        {

//crash here

//Unable to find an entry point named '_DllTest' in DLL CudaCodes.dll'.

           int nTestResult = _DllTest();

}

}

}

//template.cu output → CudaCodes.dll at C# application folder

extern "C" int _DllTest(int nInput)

{

	return nInput +10;

}

I’m getting a “Unable to find an entry point named ‘_DllTest’ in DLL CudaCodes.dll’”

any suggestings, thank you

2

The following link does not have anything CUDA related, but may server as a starting point to getting something connected to C#

[url=“How to create a DLL library in C and then use it with C# - CodeProject”]How to create a DLL library in C and then use it with C# - CodeProject

Please respond back if you find anything CUDA related that causes any difficulty, or if you have success and want to share what you discover.

3

Thanks for the link. It gave me a good direction on what to do.

Here are some other note I’ve found out:

function declaration in the .cu must be inside extern “C” brackets
example

extern “C”{

__declspec(dllexport) void Cuda_InitVariables();
__declspec(dllexport) int  Cuda_ActivateDevice();
__declspec(dllexport) bool Cuda_Action(int nDeviceNumber);
__declspec(dllexport) bool Cuda_FreeMem();

}

and in the c# source code if you are passing a variable “CallingConvention = CallingConvention.Cdecl” must be in the DllImport.

    [DllImport("CudaCodes.dll", CallingConvention = CallingConvention.Cdecl)]
    public static extern bool Cuda_Action(int nDeviceNumber);
4

Im using CUDA via dll in C# but via an alternative method and it seems reasonably simple to me. I have created a managed wrapper in C++/CLI around my C++ classes with all my CUDA stuff in and then just added this managed wrapper as a reference in my c# project.

linky