C#串口通讯实例

本文参考《C#网络通信程序设计》（张晓明  编著)

程序界面如下图：

C#串口通讯实例

 

 

参数设置界面代码如下:

C#串口通讯实例
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 ComDemo
{
    public partial class ComSet : Form
    {
        public ComSet()
        {
            InitializeComponent();
        }

        private void ComSet_Load(object sender, EventArgs e)
        {
            //串口
            string[] ports = SerialPort.GetPortNames();
            foreach (string port in ports)
            {
                cmbPort.Items.Add(port);
            }
            cmbPort.SelectedIndex = 0;

            //波特率
            cmbBaudRate.Items.Add("110");
            cmbBaudRate.Items.Add("300");
            cmbBaudRate.Items.Add("1200");
            cmbBaudRate.Items.Add("2400");
            cmbBaudRate.Items.Add("4800");
            cmbBaudRate.Items.Add("9600");
            cmbBaudRate.Items.Add("19200");
            cmbBaudRate.Items.Add("38400");
            cmbBaudRate.Items.Add("57600");
            cmbBaudRate.Items.Add("115200");
            cmbBaudRate.Items.Add("230400");
            cmbBaudRate.Items.Add("460800");
            cmbBaudRate.Items.Add("921600");
            cmbBaudRate.SelectedIndex = 5;

            //数据位
            cmbDataBits.Items.Add("5");
            cmbDataBits.Items.Add("6");
            cmbDataBits.Items.Add("7");
            cmbDataBits.Items.Add("8");
            cmbDataBits.SelectedIndex = 3;

            //停止位
            cmbStopBit.Items.Add("1");
            cmbStopBit.SelectedIndex = 0;

            //佼验位
            cmbParity.Items.Add("无");
            cmbParity.SelectedIndex = 0;
        }

        private void bntOK_Click(object sender, EventArgs e)
        {
            //以下4个参数都是从窗体MainForm传入的
            MainForm.strProtName = cmbPort.Text;
            MainForm.strBaudRate = cmbBaudRate.Text;
            MainForm.strDataBits = cmbDataBits.Text;
            MainForm.strStopBits = cmbStopBit.Text;
            DialogResult = DialogResult.OK;
        }

        private void bntCancel_Click(object sender, EventArgs e)
        {
            DialogResult = DialogResult.Cancel;
        }
    }
}
C#串口通讯实例


 

主界面代码如下：

C#串口通讯实例
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;
using System.IO;
using System.Threading;

namespace ComDemo
{
    public partial class MainForm : Form
    {
        public MainForm()
        {
            InitializeComponent();
        }
        private Thread getRecevice;
        protected Boolean stop = false;
        protected Boolean conState = false;
        private StreamReader sRead;
        string strRecieve;
        bool bAccpet = false;

        SerialPort sp = new SerialPort();//实例化串口通讯类
        //以下定义4个公有变量，用于参数传递
        public static string strProtName = "";
        public static string strBaudRate = "";
        public static string strDataBits = "";
        public static string strStopBits = "";

        private void MainForm_Load(object sender, EventArgs e)
        {
            groupBox1.Enabled = false;
            groupBox2.Enabled = false;
            this.toolStripStatusLabel1.Text = "端口号：端口未打开 | ";
            this.toolStripStatusLabel2.Text = "波特率：端口未打开 | ";
            this.toolStripStatusLabel3.Text = "数据位：端口未打开 | ";
            this.toolStripStatusLabel4.Text = "停止位：端口未打开 | ";
            this.toolStripStatusLabel5.Text = "";
        }
        //串口设计
        private void btnSetSP_Click(object sender, EventArgs e)
        {
            timer1.Enabled = false;
            sp.Close();
            ComSet dlg = new ComSet();
            if (dlg.ShowDialog() == DialogResult.OK)
            {
                sp.PortName = strProtName;//串口号
                sp.BaudRate = int.Parse(strBaudRate);//波特率
                sp.DataBits = int.Parse(strDataBits);//数据位
                sp.StopBits = (StopBits)int.Parse(strStopBits);//停止位
                sp.ReadTimeout = 500;//读取数据的超时时间，引发ReadExisting异常
            }
        }
        //打开/关闭串口
        private void bntSwitchSP_Click(object sender, EventArgs e)
        {
            if (bntSwitchSP.Text == "打开串口")
            {
                if (strProtName != "" && strBaudRate != "" && strDataBits != "" && strStopBits != "")
                {
                    try
                    {
                        if (sp.IsOpen)
                        {
                            sp.Close();
                            sp.Open();//打开串口
                        }
                        else
                        {
                            sp.Open();//打开串口
                        }
                        bntSwitchSP.Text = "关闭串口";
                        groupBox1.Enabled = true;
                        groupBox2.Enabled = true;
                        this.toolStripStatusLabel1.Text = "端口号：" + sp.PortName + " | ";
                        this.toolStripStatusLabel2.Text = "波特率：" + sp.BaudRate + " | ";
                        this.toolStripStatusLabel3.Text = "数据位：" + sp.DataBits + " | ";
                        this.toolStripStatusLabel4.Text = "停止位：" + sp.StopBits + " | ";
                        this.toolStripStatusLabel5.Text = "";

                    }
                    catch (Exception ex)
                    {
                        MessageBox.Show("错误：" + ex.Message, "C#串口通信");
                    }
                }
                else
                {
                    MessageBox.Show("请先设置串口！", "RS232串口通信");
                }
            }
            else
            {
                timer1.Enabled = false;
                timer2.Enabled = false;
                bntSwitchSP.Text = "打开串口";
                if (sp.IsOpen)
                    sp.Close();
                groupBox1.Enabled = false;
                groupBox2.Enabled = false;
                this.toolStripStatusLabel1.Text = "端口号：端口未打开 | ";
                this.toolStripStatusLabel2.Text = "波特率：端口未打开 | "

本文参考《C#网络通信程序设计》（张晓明  编著)

程序界面如下图：

C#串口通讯实例

 

 

参数设置界面代码如下:

C#串口通讯实例
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 ComDemo
{
    public partial class ComSet : Form
    {
        public ComSet()
        {
            InitializeComponent();
        }

        private void ComSet_Load(object sender, EventArgs e)
        {
            //串口
            string[] ports = SerialPort.GetPortNames();
            foreach (string port in ports)
            {
                cmbPort.Items.Add(port);
            }
            cmbPort.SelectedIndex = 0;

            //波特率
            cmbBaudRate.Items.Add("110");
            cmbBaudRate.Items.Add("300");
            cmbBaudRate.Items.Add("1200");
            cmbBaudRate.Items.Add("2400");
            cmbBaudRate.Items.Add("4800");
            cmbBaudRate.Items.Add("9600");
            cmbBaudRate.Items.Add("19200");
            cmbBaudRate.Items.Add("38400");
            cmbBaudRate.Items.Add("57600");
            cmbBaudRate.Items.Add("115200");
            cmbBaudRate.Items.Add("230400");
            cmbBaudRate.Items.Add("460800");
            cmbBaudRate.Items.Add("921600");
            cmbBaudRate.SelectedIndex = 5;

            //数据位
            cmbDataBits.Items.Add("5");
            cmbDataBits.Items.Add("6");
            cmbDataBits.Items.Add("7");
            cmbDataBits.Items.Add("8");
            cmbDataBits.SelectedIndex = 3;

            //停止位
            cmbStopBit.Items.Add("1");
            cmbStopBit.SelectedIndex = 0;

            //佼验位
            cmbParity.Items.Add("无");
            cmbParity.SelectedIndex = 0;
        }

        private void bntOK_Click(object sender, EventArgs e)
        {
            //以下4个参数都是从窗体MainForm传入的
            MainForm.strProtName = cmbPort.Text;
            MainForm.strBaudRate = cmbBaudRate.Text;
            MainForm.strDataBits = cmbDataBits.Text;
            MainForm.strStopBits = cmbStopBit.Text;
            DialogResult = DialogResult.OK;
        }

        private void bntCancel_Click(object sender, EventArgs e)
        {
            DialogResult = DialogResult.Cancel;
        }
    }
}
C#串口通讯实例


 

主界面代码如下：

C#串口通讯实例
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;
using System.IO;
using System.Threading;

namespace ComDemo
{
    public partial class MainForm : Form
    {
        public MainForm()
        {
            InitializeComponent();
        }
        private Thread getRecevice;
        protected Boolean stop = false;
        protected Boolean conState = false;
        private StreamReader sRead;
        string strRecieve;
        bool bAccpet = false;

        SerialPort sp = new SerialPort();//实例化串口通讯类
        //以下定义4个公有变量，用于参数传递
        public static string strProtName = "";
        public static string strBaudRate = "";
        public static string strDataBits = "";
        public static string strStopBits = "";

        private void MainForm_Load(object sender, EventArgs e)
        {
            groupBox1.Enabled = false;
            groupBox2.Enabled = false;
            this.toolStripStatusLabel1.Text = "端口号：端口未打开 | ";
            this.toolStripStatusLabel2.Text = "波特率：端口未打开 | ";
            this.toolStripStatusLabel3.Text = "数据位：端口未打开 | ";
            this.toolStripStatusLabel4.Text = "停止位：端口未打开 | ";
            this.toolStripStatusLabel5.Text = "";
        }
        //串口设计
        private void btnSetSP_Click(object sender, EventArgs e)
        {
            timer1.Enabled = false;
            sp.Close();
            ComSet dlg = new ComSet();
            if (dlg.ShowDialog() == DialogResult.OK)
            {
                sp.PortName = strProtName;//串口号
                sp.BaudRate = int.Parse(strBaudRate);//波特率
                sp.DataBits = int.Parse(strDataBits);//数据位
                sp.StopBits = (StopBits)int.Parse(strStopBits);//停止位
                sp.ReadTimeout = 500;//读取数据的超时时间，引发ReadExisting异常
            }
        }
        //打开/关闭串口
        private void bntSwitchSP_Click(object sender, EventArgs e)
        {
            if (bntSwitchSP.Text == "打开串口")
            {
                if (strProtName != "" && strBaudRate != "" && strDataBits != "" && strStopBits != "")
                {
                    try
                    {
                        if (sp.IsOpen)
                        {
                            sp.Close();
                            sp.Open();//打开串口
                        }
                        else
                        {
                            sp.Open();//打开串口
                        }
                        bntSwitchSP.Text = "关闭串口";
                        groupBox1.Enabled = true;
                        groupBox2.Enabled = true;
                        this.toolStripStatusLabel1.Text = "端口号：" + sp.PortName + " | ";
                        this.toolStripStatusLabel2.Text = "波特率：" + sp.BaudRate + " | ";
                        this.toolStripStatusLabel3.Text = "数据位：" + sp.DataBits + " | ";
                        this.toolStripStatusLabel4.Text = "停止位：" + sp.StopBits + " | ";
                        this.toolStripStatusLabel5.Text = "";

                    }
                    catch (Exception ex)
                    {
                        MessageBox.Show("错误：" + ex.Message, "C#串口通信");
                    }
                }
                else
                {
                    MessageBox.Show("请先设置串口！", "RS232串口通信");
                }
            }
            else
            {
                timer1.Enabled = false;
                timer2.Enabled = false;
                bntSwitchSP.Text = "打开串口";
                if (sp.IsOpen)
                    sp.Close();
                groupBox1.Enabled = false;
                groupBox2.Enabled = false;
                this.toolStripStatusLabel1.Text = "端口号：端口未打开 | ";
                this.toolStripStatusLabel2.Text = "波特率：端口未打开 | "

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