FunnyPi-Archive/FunnyCommon/Local/PiFileGpout.cs

#define STREAM

using System;
using System.IO;
using System.Threading;
using FunnyCommon.Shared;

namespace FunnyCommon.Local
{
    public class PiFileGpout : IPiGpout
    {
        private const string PathExport = "/sys/class/gpio/export";
        private const string PathUnexport = "/sys/class/gpio/unexport";

        private string PathDirection => $"/sys/class/gpio/gpio{_pin}/direction";
        private string PathValue => $"/sys/class/gpio/gpio{_pin}/value";

#if STREAM
        private Stream _pinStream;
#endif
        private readonly int _pin;

        public PiFileGpout(int pin)
        {
            _pin = pin;
            Init();
        }

        private void Init()
        {
            File.WriteAllText(PathExport, _pin.ToString());
            Thread.Sleep(100);
            File.WriteAllText(PathDirection, "out");
#if STREAM
            Thread.Sleep(100);
            _pinStream = new FileStream(PathValue
                , FileMode.Open, FileAccess.ReadWrite, FileShare.ReadWrite);
#endif
        }

        private void Close()
        {
#if STREAM
            if (_pinStream == null) return;
            _pinStream.Close();
            _pinStream = null;
#endif
            File.WriteAllText(PathUnexport, _pin.ToString());
        }

        public void WritePin(bool height)
        {
#if STREAM
            _pinStream.Seek(0, SeekOrigin.Begin);
            _pinStream.WriteByte((byte)(height ? 49 : 48));
            _pinStream.Flush();
#else
            File.WriteAllText(PathValue, height ? "1" : "0");
#endif
        }

        public void Dispose()
        {
            Close();
        }

        public static bool Rob(int pin)
        {
            try
            {
                File.WriteAllText(PathUnexport, pin.ToString());
                return true;
            }
            catch (Exception)
            {
                return false;
            }
        }
    }
}