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：
1 using System; 2 using System.Collections.Generic; 3 using System.IO.Ports; 4 using System.Linq; 5 using System.Text; 6 using System.Threading.Tasks; 7 8 namespace NewLand 9 { 10 public delegate void ShowMsgDelegate(string info); 11 12 public class NewLandSerial 13 { 14 15 //定义串口类对象 16 private SerialPort MyCom; 17 //定义接收字节数组 18 byte[] bData = new byte[1024]; 19 byte mReceiveByte; 20 int mReceiveByteCount = 0; 21 public ShowMsgDelegate myShowInfo; 22 23 public NewLandSerial() 24 { 25 MyCom = new SerialPort(); 26 27 } 28 29 #region 打开关闭串口方法 30 /// <summary> 31 /// 打开串口方法【9600 N 8 1】 32 /// </summary> 33 /// <param name="iBaudRate">波特率</param> 34 /// <param name="iPortNo">端口号</param> 35 /// <param name="iDataBits">数据位</param> 36 /// <param name="iParity">校验位</param> 37 /// <param name="iStopBits">停止位</param> 38 /// <returns></returns> 39 public bool OpenMyComm(int iBaudRate, string iPortNo, int iDataBits, Parity iParity, StopBits iStopBits) 40 { 41 try 42 { 43 //关闭已打开串口 44 if (MyCom.IsOpen) 45 { 46 MyCom.Close(); 47 } 48 //设置串口属性 49 MyCom.BaudRate = iBaudRate; 50 MyCom.PortName = iPortNo; 51 MyCom.DataBits = iDataBits; 52 MyCom.Parity = iParity; 53 MyCom.StopBits = iStopBits; 54 MyCom.ReceivedBytesThreshold = 1; 55 MyCom.DataReceived += MyCom_DataReceived; 56 57 MyCom.Open(); 58 return true; 59 } 60 catch 61 { 62 return false; 63 } 64 } 65 66 private void MyCom_DataReceived(object sender, SerialDataReceivedEventArgs e) 67 { 68 mReceiveByteCount = 0; 69 while (MyCom.BytesToRead > 0) 70 { 71 mReceiveByte = (byte)MyCom.ReadByte(); 72 bData[mReceiveByteCount] = mReceiveByte; 73 mReceiveByteCount += 1; 74 if (mReceiveByteCount >= 1024) 75 { 76 mReceiveByteCount = 0; 77 //清除输入缓存区 78 MyCom.DiscardInBuffer(); 79 return; 80 } 81 } 82 if (mReceiveByteCount > 0) 83 { 84 myShowInfo(Encoding.ASCII.GetString(GetByteArray(bData, 0, mReceiveByteCount))); 85 } 86 87 } 88 89 /// <summary> 90 /// 自定义截取字节数组 91 /// </summary> 92 /// <param name="byteArr"></param> 93 /// <param name="start"></param> 94 /// <param name="length"></param> 95 /// <returns></returns> 96 private byte[] GetByteArray(byte[] byteArr, int start, int length) 97 { 98 byte[] Res = new byte[length]; 99 if (byteArr != null && byteArr.Length >= length) 100 { 101 for (int i = 0; i < length; i++) 102 { 103 Res[i] = byteArr[i + start]; 104 } 105 106 } 107 return Res; 108 } 109 110 111 /// <summary> 112 /// 关闭串口方法 113 /// </summary> 114 /// <returns></returns> 115 public bool ClosePort() 116 { 117 if (MyCom.IsOpen) 118 { 119 MyCom.Close(); 120 return true; 121 } 122 else 123 { 124 return false; 125 } 126 127 } 128 #endregion 129 130 } 131 }
再者就是界面的调用，直接看代码：
1 using System; 2 using System.Collections.Generic; 3 using System.ComponentModel; 4 using System.Configuration; 5 using System.Data; 6 using System.Drawing; 7 using System.IO.Ports; 8 using System.Linq; 9 using System.Text; 10 using System.Threading.Tasks; 11 using System.Windows.Forms; 12 13 namespace NewLand 14 { 15 public partial class FrmMain : Form 16 { 17 public FrmMain() 18 { 19 InitializeComponent(); 20 this.Load += FrmMain_Load; 21 22 } 23 24 private void FrmMain_Load(object sender, EventArgs e) 25 { 26 this.btn_DisConn.Enabled = false; 27 } 28 29 private void txt_Info_DoubleClick(object sender, EventArgs e) 30 { 31 this.txt_Info.Clear(); 32 } 33 34 NewLandSerial myNewLand; 35 36 37 private void btn_Connect_Click(object sender, EventArgs e) 38 { 39 string Port= ConfigurationManager.AppSettings["Port"].ToString(); 40 41 myNewLand = new NewLandSerial(); 42 myNewLand.myShowInfo += ShowInfo; 43 44 if (myNewLand.OpenMyComm(9600, Port, 8, Parity.None, StopBits.One)) 45 { 46 MessageBox.Show("连接成功！", "建立连接"); 47 this.btn_Connect.Enabled = false; 48 this.btn_DisConn.Enabled = true; 49 } 50 else 51 { 52 MessageBox.Show("连接失败！", "建立连接"); 53 } 54 } 55 56 private void ShowInfo(string info) 57 { 58 Invoke(new Action(() => 59 { 60 this.txt_Info.AppendText(DateTime.Now.ToString("yyyy/MM/dd HH:mm:ss") + " " + info + Environment.NewLine); 61 })); 62 } 63 64 private void btn_DisConn_Click(object sender, EventArgs e) 65 { 66 if (myNewLand.ClosePort()) 67 { 68 MessageBox.Show("断开连接成功！", "断开连接"); 69 this.btn_Connect.Enabled = true; 70 this.btn_DisConn.Enabled = false; 71 } 72 else 73 { 74 MessageBox.Show("断开连接失败！", "断开连接"); 75 } 76 } 77 78 private void btn_ParaSet_Click(object sender, EventArgs e) 79 { 80 new FrmParaSet().ShowDialog(); 81 } 82 } 83 }
最后是参数配置，通过App.Config实现：
1 using System; 2 using System.Collections.Generic; 3 using System.ComponentModel; 4 using System.Configuration; 5 using System.Data; 6 using System.Drawing; 7 using System.Linq; 8 using System.Text; 9 using System.Threading.Tasks; 10 using System.Windows.Forms; 11 12 namespace NewLand 13 { 14 public partial class FrmParaSet : Form 15 { 16 public FrmParaSet() 17 { 18 InitializeComponent(); 19 this.Load += FrmParaSet_Load; 20 } 21 22 private void FrmParaSet_Load(object sender, EventArgs e) 23 { 24 for (int i = 0; i < 20; i++) 25 { 26 this.cmb_Port.Items.Add("COM" + i.ToString()); 27 } 28 29 this.cmb_Port.Text = ConfigurationManager.AppSettings["Port"].ToString(); 30 } 31 32 private void btn_Set_Click(object sender, EventArgs e) 33 { 34 Configuration cfa = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None); //首先打开配置文件 35 cfa.AppSettings.Settings["Port"].Value = this.cmb_Port.Text; 36 cfa.Save(); //保存配置文件 37 ConfigurationManager.RefreshSection("appSettings"); //刷新配置文件 38 this.Close(); 39 } 40 } 41 }