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

namespace?SerialPortDemo
{
????public?partial?class?Form1?:?Form
????{
????????private?SerialPort?com;
????????public?Form1（）
????????{
????????????InitializeComponent（）;
????????}

????????private?void?GetAutoCom（）
????????{
????????????//獲取本地配置文件（注冊表文件）????????
????????????Microsoft.Win32.RegistryKey?hklm?=?Microsoft.Win32.Registry.LocalMachine;
????????????//讀取HARDWARE節(jié)點(diǎn)的鍵值
????????????Microsoft.Win32.RegistryKey?software11?=?hklm.OpenSubKey（“HARDWARE“）;
????????????//打開“HARDWARE“子鍵
????????????Microsoft.Win32.RegistryKey?software?=?software11.OpenSubKey（“DEVICEMAP“）;
????????????Microsoft.Win32.RegistryKey?sitekey?=?software.OpenSubKey（“SERIALCOMM“）;
????????????//獲取當(dāng)前子鍵
????????????string[]?Str2?=?sitekey.GetValueNames（）;
????????????//獲得當(dāng)前子鍵存在的鍵值
????????????int?i;
????????????for?（i?=?0;?i?????????????{
????????????????cmbCOMPort.Items.Add（sitekey.GetValue（Str2[i]））;
????????????}
????????}

????????private?void?Form1_Load（object?sender?EventArgs?e）
????????{
????????????GetAutoCom（）;
????????????com?=?new?SerialPort（cmbCOMPort.Text）;?//實(shí)例化SerialPort并設(shè)置COM口
????????????com.BaudRate?=?9600;//波特率
????????????com.Parity?=?Parity.None;//無奇偶校驗(yàn)位
????????????com.StopBits?=?StopBits.Two;//兩個(gè)停止位
????????????com.Handshake?=?Handshake.RequestToSend;//控制協(xié)議
????????????com.ReceivedBytesThreshold?=?13;//設(shè)置?DataReceived?事件發(fā)生前內(nèi)部輸入緩沖區(qū)中的字節(jié)數(shù)我這里是13字節(jié)為一組
????????????com.Open（）;?????????????????//打開串口??
????????????com.DataReceived?+=?new?SerialDataReceivedEventHandler（Com_DataReceived）;
????????}

????????///?

????????///?監(jiān)聽串口數(shù)據(jù)線程
????????///?

????????///?
????????///?

????????private?void?Com_DataReceived（object?sender?SerialDataReceivedEventArgs?e）

????????{
????????????Thread.Sleep（500）;//線程休眠500毫秒，方便接收串口的全部數(shù)據(jù)
????????????try
????????????{
????????????????if?（com.IsOpen）
????????????????{
????????????????????byte[]?readBuffer?=?new?byte[com.ReadBufferSize?+?1];
????????????????????try
????????????????????{
????????????????????????int?count?=?com.Read（readBuffer?0?com.ReadBufferSize）;????????//讀取串口數(shù)據(jù)（監(jiān)聽）
????????????????????????String?SerialIn?=?System.Text.Encoding.ASCII.GetString（readBuffer?0?count）;//將字節(jié)數(shù)組解碼為字符串
????????????????????????if?（count?!=?0）
????????????????????????{
????????????????????????????//這里強(qiáng)調(diào)一下線程里不可以直接對UI進(jìn)行賦值，只能使用委托操作控件
????????????????????????????this.BeginInvoke（new?System.Threading.ThreadStart（delegate?（）
????????????????????????????{
????????????????????????????????richTextBox1.Text?=?SerialIn;
????????????????????????????}））;
????????????????????????}
????????????????????}
????????????????????