SO75244656

NativeEntry.cs

using System.Runtime.InteropServices;
using System;
using System.Windows.Forms;
// this guy stolen my code without credits https://www.codeproject.com/Articles/16310/How-to-Automate-Exporting-NET-Function-to-Unmanage
using RGiesecke.DllExport;
//<Project Sdk="Microsoft.NET.Sdk">
//  <PropertyGroup>
//    <TargetFramework>net48</TargetFramework>
//    <PlatformTarget>x86</PlatformTarget>
//  </PropertyGroup>
//  <ItemGroup>
//    <PackageReference Include="UnmanagedExports.Repack.Upgrade" Version="1.2.1" />
//  </ItemGroup>
//  <ItemGroup>
//    <Reference Include="System.Windows.Forms" />
//  </ItemGroup>
//</Project>


namespace Rundll32Test
{
	public static class NativeEntry
	{
		[DllExport("Test", CallingConvention = CallingConvention.StdCall)]
		public static void Test(IntPtr hwnd, IntPtr hinst, string cmdLine, int cmdShow)
		{
			MessageBox.Show(string.Format("HWND: {0}, HINST: {1}, CDMDSHOW: {3}\n{2}", hwnd, hinst, cmdLine, cmdShow));
		}
	}
}