基于C#实现与新大陆扫码枪通信

　　　随着工业互联的发展，扫码枪在很多场合都有所应用，超市、商场以及一些智能工厂。今天主要讲如何通过C#实现与新大陆扫码枪（OY10）进行通信，对于扫码枪的配置，这里就不多说了，结合说明书就可以实现。这里值得注意的是，如果安装驱动后，电脑设备管理器中看不到COM口，可能需要扫一个条形码来设置一下，具体参考说明书通讯配置章节。

　　　首先贴下界面，基于Winform开发，主要就是正常的串口通信，涉及的技术包括UI界面设计+串口通信知识+参数配置处理+委托更新界面，涵盖了一个小系统必备的一些知识。

　　　　

　　　　再来贴一些源码，首先贴个核心串口类的编写：

using System;
using System.Collections.Generic;
using System.IO.Ports;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace NewLand
{
    public delegate void ShowMsgDelegate(string info);

    public class NewLandSerial
    {

        //定义串口类对象
        private SerialPort MyCom;
        //定义接收字节数组
        byte[] bData = new byte[1024];
        byte mReceiveByte;
        int mReceiveByteCount = 0;
        public ShowMsgDelegate myShowInfo;

        public NewLandSerial()
        {
            MyCom = new SerialPort();

        }

        #region 打开关闭串口方法
        /// <summary>
        /// 打开串口方法【9600 N 8 1】
        /// </summary>
        /// <param name="iBaudRate">波特率</param>
        /// <param name="iPortNo">端口号</param>
        /// <param name="iDataBits">数据位</param>
        /// <param name="iParity">校验位</param>
        /// <param name="iStopBits">停止位</param>
        /// <returns></returns>
        public bool OpenMyComm(int iBaudRate, string iPortNo, int iDataBits, Parity iParity, StopBits iStopBits)
        {
            try
            {
                //关闭已打开串口
                if (MyCom.IsOpen)
                {
                    MyCom.Close();
                }
                //设置串口属性
                MyCom.BaudRate = iBaudRate;
                MyCom.PortName = iPortNo;
                MyCom.DataBits = iDataBits;
                MyCom.Parity = iParity;
                MyCom.StopBits = iStopBits;
                MyCom.ReceivedBytesThreshold = 1;
                MyCom.DataReceived += MyCom_DataReceived;

                MyCom.Open();
                return true;
            }
            catch
            {
                return false;
            }
        }

        private void MyCom_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            mReceiveByteCount = 0;
            while (MyCom.BytesToRead > 0)
            {
                mReceiveByte = (byte)MyCom.ReadByte();
                bData[mReceiveByteCount] = mReceiveByte;
                mReceiveByteCount += 1;
                if (mReceiveByteCount >= 1024)
                {
                    mReceiveByteCount = 0;
                    //清除输入缓存区
                    MyCom.DiscardInBuffer();
                    return;
                }
            }
            if (mReceiveByteCount > 0)
            {
                myShowInfo(Encoding.ASCII.GetString(GetByteArray(bData, 0, mReceiveByteCount)));
            }

        }

        /// <summary>
        /// 自定义截取字节数组
        /// </summary>
        /// <param name="byteArr"></param>
        /// <param name="start"></param>
        /// <param name="length"></param>
        /// <returns></returns>
        private byte[] GetByteArray(byte[] byteArr, int start, int length)
        {
            byte[] Res = new byte[length];
            if (byteArr != null && byteArr.Length >= length)
            {
                for (int i = 0; i < length; i++)
                {
                    Res[i] = byteArr[i + start];
                }

            }
            return Res;
        }


        /// <summary>
        /// 关闭串口方法
        /// </summary>
        /// <returns></returns>
        public bool ClosePort()
        {
            if (MyCom.IsOpen)
            {
                MyCom.Close();
                return true;
            }
            else
            {
                return false;
            }

        }
        #endregion

    }
}

　　　　再者就是界面的调用，直接看代码：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Configuration;
using System.Data;
using System.Drawing;
using System.IO.Ports;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace NewLand
{
    public partial class FrmMain : Form
    {
        public FrmMain()
        {
            InitializeComponent();
            this.Load += FrmMain_Load;

        }

        private void FrmMain_Load(object sender, EventArgs e)
        {
            this.btn_DisConn.Enabled = false;
        }

        private void txt_Info_DoubleClick(object sender, EventArgs e)
        {
            this.txt_Info.Clear();
        }

        NewLandSerial myNewLand;


        private void btn_Connect_Click(object sender, EventArgs e)
        {
           string Port= ConfigurationManager.AppSettings["Port"].ToString();

            myNewLand = new NewLandSerial();
            myNewLand.myShowInfo += ShowInfo;

            if (myNewLand.OpenMyComm(9600, Port, 8, Parity.None, StopBits.One))
            {
                MessageBox.Show("连接成功！", "建立连接");
                this.btn_Connect.Enabled = false;
                this.btn_DisConn.Enabled = true;
            }
            else
            {
                MessageBox.Show("连接失败！", "建立连接");
            }
        }

        private void ShowInfo(string info)
        {
            Invoke(new Action(() =>
            {
                this.txt_Info.AppendText(DateTime.Now.ToString("yyyy/MM/dd HH:mm:ss") + "   " + info + Environment.NewLine);
            }));
        }

        private void btn_DisConn_Click(object sender, EventArgs e)
        {
            if (myNewLand.ClosePort())
            {
                MessageBox.Show("断开连接成功！", "断开连接");
                this.btn_Connect.Enabled = true;
                this.btn_DisConn.Enabled = false;
            }
            else
            {
                MessageBox.Show("断开连接失败！", "断开连接");
            }
        }

        private void btn_ParaSet_Click(object sender, EventArgs e)
        {
            new FrmParaSet().ShowDialog();
        }
    }
}

　　　　最后是参数配置，通过App.Config实现：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Configuration;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace NewLand
{
    public partial class FrmParaSet : Form
    {
        public FrmParaSet()
        {
            InitializeComponent();
            this.Load += FrmParaSet_Load;
        }

        private void FrmParaSet_Load(object sender, EventArgs e)
        {
            for (int i = 0; i < 20; i++)
            {
                this.cmb_Port.Items.Add("COM" + i.ToString());
            }

            this.cmb_Port.Text = ConfigurationManager.AppSettings["Port"].ToString();
        }

        private void btn_Set_Click(object sender, EventArgs e)
        {
            Configuration cfa = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None); //首先打开配置文件
            cfa.AppSettings.Settings["Port"].Value = this.cmb_Port.Text;
            cfa.Save();  //保存配置文件
            ConfigurationManager.RefreshSection("appSettings");  //刷新配置文件
            this.Close();
        }
    }
}

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