C#SerialPort串口的简单使用

注：只要扫码枪设备都连接成功这段代码才可以使用

如果不使用SerialPort控件可以这样写            最后获取扫码的结果放在textbox控件上有扫码枪的可以试一下

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

namespace 串口Dome
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        //声明一个串口
        public static SerialPort _serialPort;

       
        public void setPort(string portName, int baudRate)
        {
            //实例化一下串口
            _serialPort = new SerialPort();
            
            this.RegisterSerialPort(portName, baudRate);
            if (_serialPort.IsOpen == false)
            {

                _serialPort.Open();
            }
　　　　　　　　//不用太关注这个我也不是很懂，只要知道他是个回调函数就可以
            _serialPort.DataReceived += new SerialDataReceivedEventHandler(_serialPort_DataReceived);
        }

        /// <summary>
        /// 注册串口
        /// </summary>
        /// <param name="portName"></param>
        /// <param name="baudRate"></param>
        public void RegisterSerialPort(string portName, int baudRate)
        {
            // 串口名
            _serialPort.PortName = portName;
            // 波特率
            _serialPort.BaudRate = baudRate;
            // 数据位
            _serialPort.DataBits = 8;
            // 停止位
            _serialPort.StopBits = StopBits.One;
            // 无奇偶校验位
            _serialPort.Parity = Parity.None;
        }
      
        private void _serialPort_DataReceived(object senderd, SerialDataReceivedEventArgs e)
        {
            //等待100ms 防止读取不全的情况
            Thread.Sleep(100);
            byte[] m_recvBytes = new byte[_serialPort.BytesToRead]; //获取接受缓冲区的字节数  定义缓冲区的大小
            int result = _serialPort.Read(m_recvBytes, 0, m_recvBytes.Length);//从串口读取数据 返回读取的字节数
            if (result <= 0)
            {
                return;
            }
            //将字节转换成字符串
            //string strResult = Encoding.ASCII.GetString(m_recvBytes);
            string strResult = Encoding.ASCII.GetString(m_recvBytes, 0, m_recvBytes.Length);
            //string strResult = Encoding.UTF8..GetString();
            _serialPort.DiscardInBuffer();
            this.Invoke((EventHandler)(delegate
            {
                txtCK.Text = strResult;
            }));

        }

        private void Form1_Load(object sender, EventArgs e)
        {
　　　　　　　　//参数1：串口（端口）号名称  参数2：波特率
            setPort("COM14", 9600);

        }
    }
}

下面这个是使用SerialPort控件写的  省略了注册串口的那个方法

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

namespace 串口Dome
{
    public partial class Form2 : Form
    {
        public Form2()
        {
            InitializeComponent();
        }
        public static SerialPort serialPort = new SerialPort();
        public void setPort()
        {
            if (serialPort.IsOpen==false)
            {
                serialPort.Open();
            }
            serialPort.DataReceived += new SerialDataReceivedEventHandler(_serialPort_DataReceived);
        }

        private  void _serialPort_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            //防止读取不全的情况 等待100ms
            Thread.Sleep(100);
            byte[] m_recvBytes = new byte[serialPort.BytesToRead];//获取缓冲区的的字节数
            int reslut = serialPort.Read(m_recvBytes, 0, m_recvBytes.Length);
            if (reslut <= 0)
            {
                return;
            }
            string strResult = Encoding.ASCII.GetString(m_recvBytes, 0, m_recvBytes.Length);//转换成字符串格式的

            serialPort.DiscardInBuffer();

            this.Invoke((EventHandler)(delegate
            {
                TxtCode.Text = strResult;
            }));


        }
        private void Form2_Load(object sender, EventArgs e)
        {
            var str = BarCode.PortName;
            int num = BarCode.BaudRate;
　　　　　　　setPort()
            MessageBox.Show("Name:" + str + "   " + "波特率" + num);
        }
    }
}

后期有更好的理解和写法在补充上去

增加一个使用正则表达来转换条码  代码量少

同第二个方法一样  使用SerialPort控件  在控件属性中修改对应的COM名称和波特率

 接下来就是代码部分

 public void OpenSbar()
        {
            if (serialPort1.IsOpen == false)
            {
                serialPort1.Open();
            }
            serialPort1.DataReceived += new SerialDataReceivedEventHandler(SBar_DataReceived);
        }

        private void SBar_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            this.labelCode.Text = "等待中...";
            Thread.Sleep(150);
            string str_Buff = serialPort1.ReadExisting();
            str_Buff = System.Text.RegularExpressions.Regex.Replace(str_Buff, @"[^0-9a-zA-Z]+", "");
　　　　　　　//Code获取到的条码
            string Code = str_Buff.Trim();
        }