C# Unmanaged Export not working

Question

I am trying to get the Unmanaged Export Basic sample working.

The steps I am following:

• Create a new classlibrary project.
• Add the UnmanagedExports with nuget.
• Change CPU target to x86.
• Add the code from the tutorial I am following to the .cs file.
• Build

The project is built sucesfully, but when I inspect my dll with DLL Export Viewer I can not see any of my functions.

I am using 32 bits OS and SharpDevelop 4.4 (I also have tried with other SharpDevelop versions and with 64bits OS with the same result).

My sln file:

Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "test", "test\test.csproj", "{AFAA816C-65B2-4B58-9FB2-EB7482AA0F5F}"
    EndProject
    Global
        GlobalSection(SolutionConfigurationPlatforms) = preSolution
            Debug|x86 = Debug|x86
            Release|x86 = Release|x86
        EndGlobalSection
        GlobalSection(ProjectConfigurationPlatforms) = postSolution
            {AFAA816C-65B2-4B58-9FB2-EB7482AA0F5F}.Debug|x86.ActiveCfg = Debug|x86
            {AFAA816C-65B2-4B58-9FB2-EB7482AA0F5F}.Debug|x86.Build.0 = Debug|x86
            {AFAA816C-65B2-4B58-9FB2-EB7482AA0F5F}.Release|x86.ActiveCfg = Release|x86
            {AFAA816C-65B2-4B58-9FB2-EB7482AA0F5F}.Release|x86.Build.0 = Release|x86
        EndGlobalSection
    EndGlobal

My csproj file:

<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003" DefaultTargets="Build">
  <PropertyGroup>
    <ProjectGuid>{AFAA816C-65B2-4B58-9FB2-EB7482AA0F5F}</ProjectGuid>
    <ProjectTypeGuids>{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
    <Platform Condition=" '$(Platform)' == '' ">x86</Platform>
    <OutputType>Library</OutputType>
    <RootNamespace>test</RootNamespace>
    <AssemblyName>test</AssemblyName>
    <TargetFrameworkVersion>v2.0</TargetFrameworkVersion>
    <AppDesignerFolder>Properties</AppDesignerFolder>
    <TargetFrameworkProfile />
  </PropertyGroup>
  <PropertyGroup Condition=" '$(Platform)' == 'x86' ">
    <PlatformTarget>x86</PlatformTarget>
  </PropertyGroup>
  <PropertyGroup Condition=" '$(Configuration)' == 'Debug' ">
    <OutputPath>bin\Debug\</OutputPath>
    <DebugSymbols>True</DebugSymbols>
    <DebugType>Full</DebugType>
    <Optimize>False</Optimize>
    <CheckForOverflowUnderflow>True</CheckForOverflowUnderflow>
    <DefineConstants>DEBUG;TRACE</DefineConstants>
  </PropertyGroup>
  <PropertyGroup Condition=" '$(Configuration)' == 'Release' ">
    <OutputPath>bin\Release\</OutputPath>
    <DebugSymbols>False</DebugSymbols>
    <DebugType>None</DebugType>
    <Optimize>True</Optimize>
    <CheckForOverflowUnderflow>False</CheckForOverflowUnderflow>
    <DefineConstants>TRACE</DefineConstants>
  </PropertyGroup>
  <ItemGroup>
    <Reference Include="RGiesecke.DllExport.Metadata">
      <HintPath>..\packages\UnmanagedExports.1.2.7\lib\net\RGiesecke.DllExport.Metadata.dll</HintPath>
    </Reference>
    <Reference Include="System" />
    <Reference Include="System.Xml" />
  </ItemGroup>
  <ItemGroup>
    <Compile Include="MyClass.cs" />
    <Compile Include="Properties\AssemblyInfo.cs" />
  </ItemGroup>
  <ItemGroup>
    <None Include="packages.config" />
  </ItemGroup>
  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
</Project>

My cs file:

using System;
using System.Collections.Generic;
using System.Text;
using RGiesecke.DllExport;
using System.Runtime.InteropServices;

namespace Testme
{
    class Test
    {
        [DllExport("Add", CallingConvention = CallingConvention.StdCall)]
        public static int Add(int left, int right)
        {
            return left + right;
        }
........

Dll Export Viewer of my dll

Dll Export Viewer of a working dll (downloaded from the tutorial web)

Both dlls (mine and the downloaded) have the same size for my OS but not for the DLL Export Viewer.

What I am missing??

Answer 1

I had the same problem and I solved it this way, You need add the follow line below this line csproj file

  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />

  <!-- Remove this comment and insert This line-->
  <Import Project="packages/UnmanagedExports.1.2.7/tools/RGiesecke.DllExport.targets" Condition="Exists('packages/UnmanagedExports.1.2.7/tools/RGiesecke.DllExport.targets')"/>

Check file exist in your folder "packages/UnmanagedExports.1.2.7/tools/RGiesecke.DllExport.targets"