【SerialPort】控件的使用實例

以下是【SerialPort】控件的使用實例，發送端和接收端代碼除了端口號（例：“COM9”）不同，其他都一樣：

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

namespace Test_Serialport_串口控件_
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        SerialPort port1;
        string strCom = "COM9";

        private delegate void ShowDelegate(string strshow);

        private void Form1_Load(object sender, EventArgs e)
        {
            //我現在用的COM1端口,按需要可改成COM2,COM3
            InitCOM(strCom);
            OpenPort();
            //this.txtReceive.InvokeRequired = true;
        }

        //初始化SerialPort對象方法.PortName爲COM口名稱,例如"COM1","COM2"等,注意是string類型
        public void InitCOM(string PortName)
        {
            port1 = new SerialPort(PortName);
            port1.BaudRate = 9600;//波特率
            port1.Parity = Parity.None;//無奇偶校驗位
            port1.StopBits = StopBits.Two;//兩個停止位
            port1.Handshake = Handshake.RequestToSend;//控制協議
            port1.ReceivedBytesThreshold = 1;//設置 DataReceived 事件發生前內部輸入緩衝區中的字節數
            port1.DataReceived += new SerialDataReceivedEventHandler(port1_DataReceived);//DataReceived事件委託
        }

        //DataReceived事件委託方法
        private void port1_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            try
            {
                StringBuilder currentline = new StringBuilder();
                //循環接收數據
                while (port1.BytesToRead > 0)
                {
                    char ch = (char)port1.ReadByte();
                    currentline.Append(ch);
                }
                //在這裏對接收到的數據進行處理
                ShowTxt(currentline.ToString());
                //this.txtReceive.Text = currentline.ToString();
                //
                currentline = new StringBuilder();
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message.ToString());
            }
        }

        public void ShowTxt(string strShow)
        {

            if (this.txtReceive.InvokeRequired)
            {
                //   this.txtreceive.BeginInvoke(new ShowDelegate(Show), strshow);//這個也可以
                this.txtReceive.Invoke(new ShowDelegate(ShowTxt), strShow);
            }
            else
            {
                this.txtReceive.Text = strShow;

            }
        }

        //打開串口的方法
        public void OpenPort()
        {
            try
            {
                port1.Open();
                if (port1.IsOpen)
                {
                    Console.WriteLine("the port is opened!");
                    this.labStat.Text = strCom + " 已連接!";
                }
                else
                {
                    Console.WriteLine("failure to open the port!");
                    this.labStat.Text = "連接失敗!";
                }
            }
            catch { }
        }

        //關閉串口的方法
        public void ClosePort()
        {
            port1.Close();
            if (!port1.IsOpen)
            {
                Console.WriteLine("the port is already closed!");
            }
        }

        //向串口發送數據
        public void SendCommand(string CommandString)
        {
            byte[] WriteBuffer = Encoding.ASCII.GetBytes(CommandString);
            port1.Write(WriteBuffer, 0, WriteBuffer.Length);
        }

        //調用實例
        private void btnSend_Click(object sender, EventArgs e)
        {
            string str = this.txtSend.Text;
            SendCommand(str);
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            labTime.Text = "當前時間是：" + DateTime.Now.ToLongTimeString();
        }
    }
}