DC_Initlizer/MesAdaptor/SajetConnectAdapter.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;

namespace MesAdaptor
{
    public static class SajetConnectAdapter
    {
        [DllImport("SajetConnect.dll", CallingConvention = CallingConvention.StdCall, CharSet = CharSet.Ansi)]
        public static extern bool SajetTransStart();

        [DllImport("SajetConnect.dll", CallingConvention = CallingConvention.StdCall, CharSet = CharSet.Ansi)]
        public static extern bool SajetTransClose();

        //[DllImport("SajetConnect.dll", CallingConvention = CallingConvention.StdCall, CharSet = CharSet.Ansi)]
        //public static extern bool SajetTransData(int command, IntPtr data, IntPtr length);

        [DllImport("SajetConnect.dll", CallingConvention = CallingConvention.StdCall, CharSet = CharSet.Ansi)]
        public static extern bool SajetTransData(int command, IntPtr data, IntPtr length);

        [DllImport("SajetConnect.dll", CallingConvention = CallingConvention.StdCall, CharSet = CharSet.Ansi)]
        public static extern bool SajetTransData_C(int command, out string data);

        public static bool SajetTransData(int command, ref string data)
        {
            var idByte = Encoding.ASCII.GetBytes(data);
            var length = idByte.Length;

            var dataArrayLength = Math.Max(length, 200);
            var dataArray = new byte[dataArrayLength];
            Array.Copy(idByte, 0, dataArray, 0, length);

            IntPtr dataIntPtr = System.Runtime.InteropServices.Marshal.AllocCoTaskMem(dataArrayLength);
            System.Runtime.InteropServices.Marshal.Copy(dataArray, 0, dataIntPtr, dataArray.Length);

            IntPtr lengthIntPtr = System.Runtime.InteropServices.Marshal.AllocCoTaskMem(10);
            System.Runtime.InteropServices.Marshal.WriteInt32(lengthIntPtr, length);

            var sendResult = SajetConnectAdapter.SajetTransData(command, dataIntPtr, lengthIntPtr);

            var resultString1 = System.Runtime.InteropServices.Marshal.PtrToStringAnsi(dataIntPtr);

            System.Runtime.InteropServices.Marshal.Copy(dataIntPtr, dataArray, 0, dataArrayLength);
            //System.Runtime.InteropServices.Marshal.Release(dataIntPtr);
            System.Runtime.InteropServices.Marshal.FreeCoTaskMem(dataIntPtr);

            var readLength = System.Runtime.InteropServices.Marshal.ReadInt32(lengthIntPtr);
            //System.Runtime.InteropServices.Marshal.Release(lengthIntPtr);

            var resultString = Encoding.ASCII.GetString(dataArray);

            data = resultString1.Substring(0, Math.Min(readLength, resultString1.Length));
            return sendResult;
        }
    }
}