C#SerialPort串口的簡單使用

注：只要掃碼槍設備都連接成功這段代碼才可以使用

如果不使用SerialPort控件可以這樣寫            最后獲取掃碼的結果放在textbox控件上有掃碼槍的可以試一下

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();
        }

        //聲明一個串口
        public static SerialPort _serialPort;

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

                _serialPort.Open();
            }
　　　　　　　　//不用太關注這個我也不是很懂，只要知道他是個回調函數就可以
            _serialPort.DataReceived += new SerialDataReceivedEventHandler(_serialPort_DataReceived);
        }

        /// <summary>
        /// 注冊串口
        /// </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;
            // 數據位
            _serialPort.DataBits = 8;
            // 停止位
            _serialPort.StopBits = StopBits.One;
            // 無奇偶校驗位
            _serialPort.Parity = Parity.None;
        }
      
        private void _serialPort_DataReceived(object senderd, SerialDataReceivedEventArgs e)
        {
            //等待100ms 防止讀取不全的情況
            Thread.Sleep(100);
            byte[] m_recvBytes = new byte[_serialPort.BytesToRead]; //獲取接受緩沖區的字節數  定義緩沖區的大小
            int result = _serialPort.Read(m_recvBytes, 0, m_recvBytes.Length);//從串口讀取數據 返回讀取的字節數
            if (result <= 0)
            {
                return;
            }
            //將字節轉換成字符串
            //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)
        {
　　　　　　　　//參數1：串口（端口）號名稱  參數2：波特率
            setPort("COM14", 9600);

        }
    }
}

下面這個是使用SerialPort控件寫的  省略了注冊串口的那個方法

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)
        {
            //防止讀取不全的情況 等待100ms
            Thread.Sleep(100);
            byte[] m_recvBytes = new byte[serialPort.BytesToRead];//獲取緩沖區的的字節數
            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);//轉換成字符串格式的

            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寫法在補充上去

增加一個使用正則表達來轉換條碼  代碼量少

同第二個方法一樣  使用SerialPort控件  在控件屬性中修改對應的COM名稱和波特率

 接下來就是代碼部分

 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獲取到的條碼
            string Code = str_Buff.Trim();
        }