本篇内容主要讲解“C#怎么实现简单串口通讯”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习“C#怎么实现简单串口通讯”吧!
参数设置界面代码：
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; } }}主界面代码：
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 | "; 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 = ""; } } //发送数据 private void bntSendData_Click(object sender, EventArgs e) { if (sp.IsOpen) { try { sp.Encoding = System.Text.Encoding.GetEncoding("GB2312"); sp.Write(txtSend.Text);//发送数据 } catch (Exception ex) { MessageBox.Show("错误：" + ex.Message); } } else { MessageBox.Show("请先打开串口！"); } } //选择文件 private void btnOpenFile_Click(object sender, EventArgs e) { OpenFileDialog open = new OpenFileDialog(); open.InitialDirectory = "c\\"; open.RestoreDirectory = true; open.FilterIndex = 1; open.Filter = "txt文件(*.txt)|*.txt"; if (open.ShowDialog() == DialogResult.OK) { try { if (open.OpenFile() != null) { txtFileName.Text = open.FileName; } } catch (Exception err1) { MessageBox.Show("文件打开错误! " + err1.Message, "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Warning); } } } //发送文件内容 private void bntSendFile_Click(object sender, EventArgs e) { string fileName = txtFileName.Text.Trim(); if (fileName == "") { MessageBox.Show("请选择要发送的文件！", "Error"); return; } else { //sRead = new StreamReader(fileName); sRead = new StreamReader(fileName,Encoding.Default);//解决中文乱码问题 } timer1.Start(); } //发送文件时钟 private void timer1_Tick(object sender, EventArgs e) { string str1; str1 = sRead.ReadLine(); if (str1 == null) { timer1.Stop(); sRead.Close(); MessageBox.Show("文件发送成功！", "C#串口通讯"); this.toolStripStatusLabel5.Text = ""; return; } byte[] data = Encoding.Default.GetBytes(str1); sp.Write(data, 0, data.Length); this.toolStripStatusLabel5.Text = " 文件发送中..."; } //接收数据 private void btnReceiveData_Click(object sender, EventArgs e) { if (btnReceiveData.Text == "接收数据") { sp.Encoding = Encoding.GetEncoding("GB2312"); if (sp.IsOpen) { //timer2.Enabled = true; //使用主线程进行 //使用委托以及多线程进行 bAccpet = true; getRecevice = new Thread(new ThreadStart(testDelegate)); //getRecevice.IsBackground = true; getRecevice.Start(); btnReceiveData.Text = "停止接收"; } else { MessageBox.Show("请先打开串口"); } } else { //timer2.Enabled = false; bAccpet = false; try { //停止主监听线程 if (null != getRecevice) { if (getRecevice.IsAlive) { if (!getRecevice.Join(100)) { //关闭线程 getRecevice.Abort(); } } getRecevice = null; } } catch { } btnReceiveData.Text = "接收数据"; } } private void testDelegate() { reaction r = new reaction(fun); r(); } //用于接收数据的定时时钟 private void timer2_Tick(object sender, EventArgs e) { string str = sp.ReadExisting(); string str2 = str.Replace("\r", "\r\n"); txtReceiveData.AppendText(str2); txtReceiveData.ScrollToCaret(); } //下面用到了接收信息的代理功能，此为设计的要点之一 delegate void DelegateAcceptData(); void fun() { while (bAccpet) { AcceptData(); } } delegate void reaction(); void AcceptData() { if (txtReceiveData.InvokeRequired) { try { DelegateAcceptData ddd = new DelegateAcceptData(AcceptData); this.Invoke(ddd, new object[] { }); } catch { } } else { try { strRecieve = sp.ReadExisting(); txtReceiveData.AppendText(strRecieve); } catch (Exception ex) { } } } private void bntClear_Click(object sender, EventArgs e) { txtReceiveData.Text = ""; } private void button3_Click(object sender, EventArgs e) { try { string path = Directory.GetCurrentDirectory() + @"\output.txt"; string content = this.txtReceiveData.Text; FileStream fs = new FileStream(path, FileMode.OpenOrCreate, FileAccess.Write); StreamWriter write = new StreamWriter(fs); write.Write(content); write.Flush(); write.Close(); fs.Close(); MessageBox.Show("接收信息导出在:" + path); } catch (Exception ex) { MessageBox.Show(ex.Message); } } }}效果图
到此，相信大家对“C#怎么实现简单串口通讯”有了更深的了解，不妨来实际操作一番吧！这里是编程网网站，更多相关内容可以进入相关频道进行查询，关注我们，继续学习！
