串口检测以及数据通讯示例

接受发送
using System;using System.IO.Ports;using System.Text;using System.Windows.Forms;namespace WindowsFormsApplication1{ public partial class Form1 : Form { SerialPort sp = null; bool isOpen = false; bool isSetProperty = false; //bool isHex = false; bool isHex = false; public Form1() { InitializeComponent();//窗口初始化 } private void Form1_Load(object sender, System.EventArgs e) { this.MaximumSize = this.Size; this.MinimumSize = this.Size; this.MaximizeBox = false; for(int i = 0;i < 8;i ) { cbxCOMPort.Items.Add("COM" (i 1).ToString()); } cbxCOMPort.SelectedIndex = 0; cbxBaudRate.Items.Add("2400"); cbxBaudRate.Items.Add("4800"); cbxBaudRate.Items.Add("9600"); cbxBaudRate.Items.Add("19200"); cbxBaudRate.Items.Add("38400"); cbxBaudRate.SelectedIndex = 2; cbxStopBits.Items.Add("0"); cbxStopBits.Items.Add("1"); cbxStopBits.Items.Add("1.5"); cbxStopBits.Items.Add("2"); cbxStopBits.SelectedIndex = 1; cbxDataBits.Items.Add("8"); cbxDataBits.Items.Add("7"); cbxDataBits.Items.Add("6"); cbxDataBits.Items.Add("5"); cbxDataBits.SelectedIndex = 0; cbxParity.Items.Add("无"); cbxParity.Items.Add("奇校验"); cbxParity.Items.Add("偶校验"); cbxParity.SelectedIndex = 0; rbnChar.Checked = true; } private void btnCheckCOM_Click(object sender, System.EventArgs e) { bool comExistence = false; cbxCOMPort.Items.Clear(); for(int i = 0;i<10;i ) { try { SerialPort sp = new SerialPort("COM" (i 1).ToString()); sp.Open(); sp.Close(); cbxCOMPort.Items.Add("COM" (i 1).ToString()); comExistence = true; } catch (Exception) { continue; } if (comExistence) { cbxCOMPort.SelectedIndex = 0;//ListBox显示第一个添加的索引 } else { MessageBox.Show("没有找到可用串口！", "错误提示"); } } } private bool CheckPortSetting() { if (cbxCOMPort.Text.Trim() == "") return false; if (cbxBaudRate.Text.Trim() == "") return false; if (cbxDataBits.Text.Trim() == "") return false; if (cbxParity.Text.Trim() == "") return false; if (cbxStopBits.Text.Trim() == "") return false; return true; } private bool CheckSendData() { if (tbxSendData.Text.Trim() == "") return false; return true; } private void SetPortProperty() { sp = new SerialPort(); sp.PortName = cbxCOMPort.Text.Trim(); sp.BaudRate = Convert.ToInt32(cbxBaudRate.Text.Trim()); float f = Convert.ToSingle(cbxStopBits.Text.Trim()); if (f == 0) { sp.StopBits = StopBits.None; } else if (f == 1.5) { sp.StopBits = StopBits.OnePointFive; } else if (f == 1) { sp.StopBits = StopBits.One; } else if (f == 2) { sp.StopBits = StopBits.Two; } else { sp.StopBits = StopBits.One; } sp.DataBits = Convert.ToInt16(cbxDataBits.Text.Trim()); string s = cbxParity.Text.Trim(); if (s.CompareTo("无") == 0) { sp.Parity = Parity.None; } else if (s.CompareTo("奇校验") == 0) { sp.Parity = Parity.Odd; } else if (s.CompareTo("偶校验") == 0) { sp.Parity = Parity.Even; } else { sp.Parity = Parity.None; } sp.ReadTimeout = -1; sp.RtsEnable = true; sp.DataReceived = new SerialDataReceivedEventHandler(sp_DataReceived); if (rbnHex.Checked) { isHex = true; } else { isHex = false; } } //接收 private void sp_DataReceived(object sender, SerialDataReceivedEventArgs e) { byte[] ReceivedData = new byte[sp.BytesToRead]; //创建接收字节数组 sp.Read(ReceivedData, 0, ReceivedData.Length); //读取所接收到的数据 AddData(ReceivedData); //输出 } //转码 public void AddData(byte[] ReceivedData) { if (rbnHex.Checked) { StringBuilder sb = new StringBuilder(); for (int i = 0; i < ReceivedData.Length; i ) { sb.AppendFormat("{0:x2}" " ", ReceivedData[i] "\r\n"); } AddContent(sb.ToString().ToUpper() "\r\n"); } else { AddContent(new ASCIIEncoding().GetString(ReceivedData) "\r\n"); } } //输入到显示 private void AddContent(string content) { BeginInvoke(new MethodInvoker(delegate { tbxRecvData.AppendText(""); tbxRecvData.AppendText(content); sp.DiscardInBuffer();//丢弃接收缓冲区数据 })); } private void btnCleanData_Click(object sender, EventArgs e) { tbxRecvData.Text = ""; tbxSendData.Text = ""; } private void btnSend_Click(object sender, EventArgs e) { if (isOpen) { try { sp.WriteLine(tbxSendData.Text); } catch (Exception) { MessageBox.Show("发送数据时发生错误！", "错误提示"); return; } } else { MessageBox.Show("串口未打开！","错误提示"); return; } if (!CheckSendData()) { MessageBox.Show("请输入要发送的数据！","错误提示"); return; } } private void btnOpenCOM_Click(object sender, EventArgs e) { if (isOpen == false) { if (!CheckPortSetting()) { MessageBox.Show("串口未设置！", "错误提示"); return; } if (!isSetProperty) { SetPortProperty(); isSetProperty = true; } try { sp.Open(); isOpen = true; btnOpenCOM.Text = "关闭串口"; cbxBaudRate.Enabled = false; cbxCOMPort.Enabled = false; cbxDataBits.Enabled = false; cbxParity.Enabled = false; cbxStopBits.Enabled = false; rbnChar.Enabled = false; rbnHex.Enabled = false; } catch (Exception) { isSetProperty = false; isOpen = false; MessageBox.Show("串口无效或已被占用", "错误提示"); } } else { try { sp.Close(); isOpen = false; isSetProperty = false; btnOpenCOM.Text = "打开串口"; cbxBaudRate.Enabled = true; cbxCOMPort.Enabled = true; cbxDataBits.Enabled = true; cbxParity.Enabled = true; cbxStopBits.Enabled = true; rbnChar.Enabled = true; rbnHex.Enabled = true; } catch (Exception) { MessageBox.Show("关闭串口时发生错误", "错误提示"); } } } }}