SerialPort访问接口获取电子称数据

using System;using System.IO.Ports;using System.Text;using System.Threading;/// <summary>/// 封装COM口数据/// </summary>public class ComInformation{string _wdata;string _wunit;string _qdata;string _qunit;string _percentage;/// <summary>/// 获取或设置重量/// </summary>public string WData { get { return this._wdata; } set { this._wdata = value; } }/// <summary>/// 获取或设置重量单位/// </summary>public string WUnit { get { return this._wunit; } set { this._wunit = value; } }/// <summary>/// 获取或设置数量/// </summary>public string QData { get { return this._qdata; } set { this._qdata = value; } }/// <summary>/// 获取或设置数量单位/// </summary>public string QUnit { get { return this._qunit; } set { this._qunit = value; } }/// <summary>/// 获取或设置百分数/// </summary>public string Percentage { get { return this._percentage; } set { this._percentage =value; }}}/// <summary>/// 电子称数据读取类/// </summary>public class WeightReader : IDisposable#region 字段、属性与构造函数SerialPort sp;int _speed = 300;/// <summary>/// 获取或设置电脑取COM数据缓冲时间，单位毫秒/// </summary>public int Speed{get{return this._speed;}set{if (value < 300)throw new Exception("串口读取缓冲时间不能小于300毫秒!");this._speed = value;}}public bool InitCom(string PortName){return this.InitCom(PortName, 4800, 300);}/// <summary>/// 初始化串口/// </summary>/// <param name="PortName">数据传输端口</param>/// <param name="BaudRate">波特率</param>/// <param name="Speed">串口读数缓冲时间</param>/// <returns></returns>public bool InitCom(string PortName, int BaudRate,int Speed){try{sp = new SerialPort(PortName, BaudRate, Parity.None, 8);sp.ReceivedBytesThreshold = 10;sp.Handshake = Handshake.RequestToSend;sp.Parity = Parity.None;sp.ReadTimeout = 600;sp.WriteTimeout = 600;this.Speed = Speed;if (!sp.IsOpen){sp.Open();}return true;}catch{throw new Exception(string.Format("无法初始化串口{0}!",PortName));}}#endregion#region 串口数据读取方法public WeightInformation ReadInfo(){string src = this.ReadCom();WeightInformation info = new WeightInformation();info.WData = this.DecodeWeightData(src);info.WUnit = this.DecodeWeightUnit(src);info.Percentage = this.DecodePercentage(src);info.QData = this.DecodeQualityData(src);info.QUnit = this.DecodeQualityUnit(src);return info;}/// <summary>/// 将COM口缓存数据全部读取/// </summary>/// <returns></returns>private string ReadCom()//返回信息{if (this.sp.IsOpen){Thread.Sleep(this._speed);string res = "";//for (int i = 0; i < 5; i++)//{byte[] buffer = new byte[sp.BytesToRead];sp.Read(buffer, 0, buffer.Length);res = System.Text.Encoding.ASCII.GetString(buffer);//if (res != "")// break;//}if (res == ""){throw new Exception("串口读取数据为空，参数设置是否正确!");}return res;}return "";}#endregion#region 基本取数方法/// <summary>/// 从字符串中取值/// </summary>/// <param name="head">起始字符串</param>/// <param name="intervalLen">间隔位长度</param>/// <param name="valueLen">值长度</param>/// <param name="src">源字符串</param>/// <returns></returns>private string DecodeValue(string head, int intervalLen, int valueLen,string src) {int index = src.IndexOf(head);return src.Substring(index + intervalLen, valueLen);}/// <summary>/// 取重量/// </summary>/// <param name="srcString">源字符串</param>/// <returns></returns>private string DecodeWeightData(string srcString){return this.DecodeValue("GS,", 3, 8,srcString);}/// <summary>/// 取重量单位/// </summary>/// <param name="srcString">源字符串</param>/// <returns></returns>private string DecodeWeightUnit(string srcString){return this.DecodeValue("GS,", 12, 2, srcString);}/// <summary>/// 取百分数/// </summary>/// <param name="srcString">源字符串</param>/// <returns></returns>private string DecodePercentage(string srcString){return this.DecodeValue("U.W.", 4, 14, srcString);}/// <summary>/// 取数量/// </summary>/// <param name="srcString">源字符串</param>/// <returns></returns>private string DecodeQualityData(string srcString){return this.DecodeValue("PCS", 3, 9, srcString);}/// <summary>/// 取数量单位/// </summary>/// <param name="srcString">源字符串</param>/// <returns></returns>private string DecodeQualityUnit(string srcString){return this.DecodeValue("PCS", 12, 3, srcString);}#endregion#region 释放所有资源public void Dispose(){if (sp != null && sp.IsOpen){sp.Close();}}#endregion}。