T31P电子秤数据读取

  连接串口后先发送"CP "激活电子秤数据发送,收到的数据包是17字节的

    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;

    namespace DotNet.ElecScales
    {

        using System.IO.Ports;
        using System.Text;
        using System.Threading;
        /// <summary>
        /// 针对Defender 3000 - T31P
        /// 厂家:奥豪斯仪器(常州)有限公司
        /// 设置成 波特率9600, 8位无校验，连续模式
        /// 编写:Wdfrog
        /// http://www.cnblogs.com/wdfrog/archive/2012/10/25/2738257.html
        /// </summary>
        public class ElecScalesReader
        {
            #region 属性d定义



            private String ComName;


         
            private int C_MaxQueueElem = 30;//队列里存放的最多元素个数
            private int C_FrameLength = 17;

            private bool Enabled = false;
            private Thread WorkThread { get; set; }



            //公开属性
            public Queue<GatherDataInfo> DataQueue { get; private set; }
            public SerialPort COMPort { get; private set; }
            public Exception LastError { get; set; }
            #endregion
            /// <summary>
            /// 构造
            /// </summary>
            public ElecScalesReader(string com)
            {
                ComName = com;
                DataQueue = new Queue<GatherDataInfo>();

            }
            private void EnsureCOMPortOpen()
            {
                if (COMPort == null)
                {
                    //配置COMPort
                    COMPort = new SerialPort(ComName.ToUpper(), 9600, Parity.None, 8, StopBits.One);
                    COMPort.Handshake = Handshake.XOnXOff;
                    COMPort.Encoding = Encoding.ASCII;
                    //COMPort.DtrEnable = true;
                }
                if (!COMPort.IsOpen)
                {
                    COMPort.Open();
                }
            }

            /// <summary>
            /// 格式-> 状态，读数,原始数据Ascii字符串,备注
            /// 状态-> 1:成功，0:无数据,4:错误
            /// </summary>
            /// <returns></returns>
            public string GetValue()
            {

                string valueTmp = "{0},{1},[{2}],{3}";//状态{1成功，0无数据,4错误}，读数,原始数据16进制表示,备注
                var data = GetValueInfo();
                return string.Format(valueTmp, data.Status, data.StrValue, data.RawStr == null ? "" : data.RawStr, "");


            }
            public GatherDataInfo GetValueInfo()
            {
               
                try
                {
                    if (WorkThread == null || WorkThread.IsAlive != true)
                    {
                        Launch();
                        Thread.Sleep(100);
                    }
                }
                catch (Exception ex)
                {
                    LastError = ex;
                    return new GatherDataInfo() { Status = 0 };
                }

                if (DataQueue.Count <= 0) Thread.Sleep(100);
                GatherDataInfo data = new GatherDataInfo() { Status = 0, AddTime = DateTime.Now, RawStr = null, StrValue = Thread.CurrentThread.ManagedThreadId.ToString() + ":" + this.GetHashCode().ToString(), };
                lock (DataQueue)
                {
                    if (DataQueue.Count > 0)
                    {
                        data = DataQueue.Last();
                    }
                }
                return data;
            }
            /// <summary>
            /// 关闭COM
            /// </summary>
            public void Close()
            {
                this.Enabled = false;
                while (COMPort != null && COMPort.IsOpen) Thread.Sleep(10);

            }

            /// <summary>
            /// 启动
            /// </summary>
            private void Launch()
            {
                EnsureCOMPortOpen();
                Enabled = true;

                WorkThread = new Thread(DoReceive);
                WorkThread.IsBackground = true;
                WorkThread.Priority = ThreadPriority.Highest;
                WorkThread.Start();

            }
            private void DoReceive()
            {
                Console.WriteLine("ThreadId:" + Thread.CurrentThread.ManagedThreadId.ToString());
                #region
                try
                {
                    byte[] buffer = new byte[COMPort.ReadBufferSize];
                    while (Enabled)
                    {

                        Thread.Sleep(100);
                        if (COMPort.BytesToRead <= 0) continue;

                        var readLine= COMPort.ReadLine();
                        if (readLine.Length != 17) continue;
                        
                        var v = readLine.Substring(0, 1).Trim() + readLine.Substring(1, 7).Trim();
                        COMPort.DiscardInBuffer();

                        Console.WriteLine(v);
                        //将数据入队列
                        var data = new GatherDataInfo() { Status = 1, AddTime = DateTime.Now, RawStr = readLine, StrValue = v };
                        lock (DataQueue)
                        {
                            DataQueue.Enqueue(data);
                            if (DataQueue.Count > C_MaxQueueElem)
                            {
                                DataQueue.Dequeue();
                            }
                        }
                   



                    }
                }
                catch (Exception ex)
                {
                    LastError = ex;
                    throw;
                }
                finally
                {

                    if (COMPort != null && COMPort.IsOpen)
                    {
                        COMPort.Close();
                    }
                }
                #endregion

            }
        }




        /// <summary>
        /// 获取的有效桢信息
        /// </summary>
        public class GatherDataInfo
        {
            public DateTime? AddTime { get; set; }
            /// <summary>
            /// 字节信息
            /// </summary>
            public String RawStr { get; set; }
            /// <summary>
            /// 转化后的信息
            /// </summary>
            public string StrValue { get; set; }

            /// <summary>
            /// 1,有效果
            /// 0,无效
            /// </summary>
            public int Status { get; set; }
        }



        public class ElecScalesHelper
        {
            private static Dictionary<String, ElecScalesReader> _Readers;
            public static Dictionary<String, ElecScalesReader> Readers
            {
                get
                {

                    if (_Readers == null)
                    {

                        _Readers = new  Dictionary<String,ElecScalesReader>();

                    }

                    return _Readers;
                }



            }
            /// <summary>
            /// 格式-> 状态，读数,原始数据16进制表示,备注
            /// 状态-> 1:成功，0:无数据,4:错误
            /// </summary>
            /// <returns></returns>
            public static string GetValue(String comName)
            {
                var com=comName.Trim().ToLower();
                if (com.IndexOf("com") != 0) return "错误的COM名称";

                lock (typeof(ElecScalesHelper))
                {

                    ElecScalesReader reader = null;
                    if (!Readers.ContainsKey(com))
                    {
                        reader = new ElecScalesReader(com);
                        Readers.Add(com, reader);
                    }
                    else
                    {
                        reader = Readers[com];
                    }
                    return reader.GetValue();
                }

            }
            /// <summary>
            /// 关闭COM
            /// </summary>
            public static string Close(String comName)
            {
                var com = comName.Trim().ToLower();
                if (!Readers.ContainsKey(com)) return "字典内不存在该串口";
                var reader = Readers[com];

                lock (typeof(ElecScalesHelper))
                {
                    reader.Close();
                    reader = null;
                }
                return "";
            }
        }



    }