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   源码介绍

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一个简单的串口助手，只有发送和接收功能

using System;
using System.IO.Ports;
using System.Windows.Forms;

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

        private void Form1_Load(object sender, EventArgs e)
        {
            comboBoxPort.Items.AddRange
                (System.IO.Ports.SerialPort.GetPortNames());//将所有可用的串口添加到comboBoxPort控件中
            int baudRate = 1200;
            for(int i = 0; i < 10; i  ) //添加波特率
            {
                comboBoxBaud.Items.Add((baudRate * (i   1)).ToString());    
              
            }
            comboBoxPort.Text = "COM1";     //串口号默认值
            comboBoxBaud.Text = "4800";     //波特率默认值
            buttonClose.Enabled = false;    //将“关闭端口”按钮设置为不可点击
              
            serialPort2.DataReceived  = new SerialDataReceivedEventHandler
                (port2_DataReceived);    //函数注册

        }

        private void port2_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            this.Invoke((EventHandler)(delegate
            {
                if (radioButtonrChar.Checked)  //以字符串模式接收
                {
                    string str = serialPort2.ReadExisting();
                    textBoxReceiver.AppendText(str);
                }
                else  //以数值模式接收           
                {
                    byte data;
                    data = (byte)serialPort2.ReadByte();
                    string str = Convert.ToString(data, 16).ToUpper();
                    textBoxReceiver.AppendText("0x"   (str.Length == 1 ? "0"   str : str)   " ");
                }
            }
             )
            );
        }

        private void button1_Click(object sender, EventArgs e)      //打开端口按钮
        {
            if (comboBoxPort.Text == string.Empty)
            {
                MessageBox.Show("请选择端口号", "错误提示");
                return;
            }
            if (comboBoxBaud.Text == string.Empty)
            {
                MessageBox.Show("请选择波特率", "错误提示");
                return;
            }
            serialPort1.PortName = comboBoxPort.Text;
            serialPort1.BaudRate = Convert.ToInt32(comboBoxBaud.Text);
            serialPort1.Open();
            serialPort2.Open();
            buttonOpen.Enabled = false;
            buttonClose.Enabled = true;

        }

        private void button2_Click(object sender, EventArgs e)  //关闭端口按钮
        {
            serialPort1.Close();
            serialPort2.Close();
            buttonOpen.Enabled = true;
            buttonClose.Enabled = false;
        }

        private void button3_Click(object sender, EventArgs e)  //发送按钮
        {
            byte[] data = new byte[1];
            if(serialPort1.IsOpen && textBoxSender.Text != "")
            {
                if (radioButtonsChar.Checked)
                {
                    serialPort1.WriteLine(textBoxSender.Text);
                }
                else
                {
               
                    for(int i = 0;i<(textBoxSender.Text.Length - textBoxSender.Text.Length%2) / 2; i  )
                    {
                        data[0] = Convert.ToByte(textBoxSender.Text.Substring(i * 2, 2), 16);
                        serialPort1.Write(data, 0, 1);
                    }
                    if(textBoxSender.Text.Length %2 !=0)
                    {
                        data[0] = Convert.ToByte(textBoxSender.Text.Substring
                            (textBoxSender.Text.Length - 1, 1), 16);
                        serialPort1.Write(data, 0, 1);

                    }
                }
            }
            //textBoxSender.Clear();  //发送完之后清空输入
        }
    }
}