Try Sentinel SuperPro API Functions (call from DLL)

/*
set PATH=c:\Windows\Microsoft.NET\Framework64\v4.0.30319;%PATH%
cls && csc.exe -debug- -target:exe -platform:x64 sx32w.cs && sx32w.exe
*/

using System;
using System.IO;
using System.Runtime.InteropServices; // ez a névtér szükséges a DLL-ek miatt

public class API
{
    [DllImport("user32.dll")]
    public static extern int MessageBox(int hWnd, string text, string caption, uint type);
}

public class SPro
{
    public static uint SPRO_APIPACKET_SIZE = 1028;
    public byte[] packet;

    [DllImport("sx32w.dll", CharSet=CharSet.Ansi, EntryPoint="RNBOsproFormatPacket")]
        public static extern ushort RNBOsproFormatPacket(byte[] packet, uint packetSize );
    [DllImport("sx32w.dll", CharSet=CharSet.Ansi, EntryPoint="RNBOsproInitialize")]
        public static extern ushort RNBOsproInitialize(byte[] packet);
    [DllImport("sx32w.dll", CharSet=CharSet.Ansi, EntryPoint="RNBOsproFindFirstUnit")]
        public static extern ushort RNBOsproFindFirstUnit(byte[] packet, ushort developerID);
}

namespace TryRNBO
{
    class TryRNBO
    {
        public static SPro oSPro;

        static void Main(string[] args)
        {

            API.MessageBox(0, "Try it!", "MessageBox...", 0);

            try
            {
                uint status = 0;
                oSPro = new SPro();
                status = SPro.RNBOsproFormatPacket(oSPro.packet,SPro.SPRO_APIPACKET_SIZE);
                if (status != 0)
                {
                    API.MessageBox(0, "FormatPacket: ok", "MessageBox...", 0);
                }
                else
                {
                    API.MessageBox(0, "FormatPacket: isn't ok", "MessageBox...", 0);
                }
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
            }

            Console.WriteLine("Press any key to exit.");
            Console.ReadKey();
        }
    }
}