using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO.Ports;
using System.Threading;
using System.Windows.Forms;

namespace DisassemblyTable
{
    public class SerialHelper
    {
        public delegate void EventHandle(byte[] readBuffer);
        public event EventHandle DataReceived;

        public System.IO.Ports.SerialPort serialPort;
        Thread thread;
        volatile bool _keepReading;

        public SerialHelper()
        {
            serialPort = new System.IO.Ports.SerialPort();
            thread = null;
            _keepReading = false;
        }

        public bool IsOpen
        {
            get 
            {
                return serialPort.IsOpen;
            }
        }        

        private void StartReading()
        {
            if (!_keepReading)
            {
                _keepReading = true;
                thread = new Thread(new ThreadStart(ReadPort));
                thread.Start();
            }
        }

        private void StopReading()
        {
            if (_keepReading)
            {
                _keepReading = false;
                
                thread.Join();
                thread = null;                
            }
        }

        private void ReadPort()
        {
            while (_keepReading)
            {
                if (serialPort.IsOpen)
                {
                    //接受数据的字节数
                    if (serialPort.BytesToRead > 0)
                    {
                        Thread.Sleep(100);
                        int count =  serialPort.BytesToRead;
                        byte[] readBuffer = new byte[count];
                        try
                        {
                            Application.DoEvents();                        
                            serialPort.Read(readBuffer, 0, count);
                            if(DataReceived != null)
                            DataReceived(readBuffer);
                            
                        }
                        catch (TimeoutException)
                        {
                        }
                    }
                }
            }
        }

        public void Open()
        {
            if (serialPort.IsOpen)
            {
                Close();  
            }
             try
             {
                 serialPort.Open();
                 if (serialPort.IsOpen)
                 {
                     StartReading();
                 }
                 else
                 {
                     //ICSharpCode.Core.LoggingService.Debug("端口打开失败");  
                 }
             }
             catch 
             {
                 MessageBox.Show(serialPort.PortName+"：无此端口或已被占用");
                 //ICSharpCode.Core.LoggingService.Debug("无此端口或已被占用:");
             } 
        }

        public bool Writetxt(string txt)
        {
            try
            {
                if (!IsOpen)
                {
                    Open();
                }
                serialPort.Write(txt);
                return true;
            }
            catch
            {
                return false;
            }
        }

        public void Close()
        {
            StopReading();
            serialPort.Close();
        }

        public void WritePort(byte[] send, int offSet, int count)
        {
            if (IsOpen)
            {
                serialPort.Write(send, offSet, count);
            }
        }
    }
}