C#串口通信
通过COM1发送数据,COM2接收数据。当COM2接收完本次发送的数据后,向COM1发送信息通知COM1本次数据已发完,COM1接到通知后,再发下一段数据。这样可以确保每次发送的数据都可以被正确接收。
代码:
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
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.Threading; using Utils; namespace 串口通信 { public partial class Form1 : Form { #region 变量 /// <summary> /// 启动还是停止,true起动,false停止 /// </summary> public static bool start = true; /// <summary> /// 串口资源 /// </summary> private static SerialPort serialPort1 = null; /// <summary> /// 串口资源 /// </summary> private static SerialPort serialPort2 = null; /// <summary> /// 成功次数 /// </summary> private static int successCount = 0; /// <summary> /// 失败次数 /// </summary> private static int errorCount = 0; /// <summary> /// 上次计算的总次数 /// </summary> private static int lastCount = 0; /// <summary> /// 定时器 /// </summary> private System.Windows.Forms.Timer timer = new System.Windows.Forms.Timer(); #endregion #region Form1 public Form1() { InitializeComponent(); } #endregion #region Form1_Load private void Form1_Load(object sender, EventArgs e) { serialPort1 = new SerialPort("COM1"); serialPort1.DataReceived += new SerialDataReceivedEventHandler(serialPort_DataReceived1); serialPort1.Open(); serialPort2 = new SerialPort("COM2"); serialPort2.DataReceived += new SerialDataReceivedEventHandler(serialPort_DataReceived2); serialPort2.Open(); } #endregion #region Form1_FormClosed private void Form1_FormClosed(object sender, FormClosedEventArgs e) { serialPort1.Close(); serialPort1.Dispose(); serialPort2.Close(); serialPort2.Dispose(); } #endregion #region btnStart_Click private void btnStart_Click(object sender, EventArgs e) { start = true; SendData(); timer.Interval = 500; timer.Tick += new EventHandler(delegate(object obj, EventArgs eventArgs) { if (lastCount == 0) { lastCount = successCount + errorCount; } else { int cnt = successCount + errorCount - lastCount; cnt = Data.Length * cnt / 1024 * (1000 / timer.Interval); double total = (successCount + errorCount) * Data.Length / 1024.0; InvokeDelegate invokeDelegate = delegate() { label3.Text = cnt.ToString() + "KB/S " + total.ToString("#.0") + "KB"; }; InvokeUtil.Invoke(this, invokeDelegate); lastCount = successCount + errorCount; } }); timer.Start(); } #endregion #region btnStop_Click private void btnStop_Click(object sender, EventArgs e) { start = false; timer.Stop(); timer.Dispose(); timer = new System.Windows.Forms.Timer(); } #endregion #region 接收串口数据事件 /// <summary> /// 接收串口数据事件 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> public void serialPort_DataReceived1(object sender, SerialDataReceivedEventArgs e) { if (serialPort1.ReadLine() != null) { successCount++; SendData(); } } /// <summary> /// 接收串口数据事件 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> public void serialPort_DataReceived2(object sender, SerialDataReceivedEventArgs e) { List<byte> bList = new List<byte>(); int i = 0; while (serialPort2.BytesToRead > 0) { byte[] bArr = new byte[serialPort2.BytesToRead]; i += serialPort2.Read(bArr, 0, bArr.Length); bList.AddRange(bArr); } serialPort2.WriteLine("success"); string s = ASCIIEncoding.UTF8.GetString(bList.ToArray()); InvokeDelegate invokeDelegate = delegate() { textBox2.Text = s; }; InvokeUtil.Invoke(this, invokeDelegate); if (s != Str) { errorCount++; invokeDelegate = delegate() { label2.Text = errorCount + "次不相等(失败)"; }; InvokeUtil.Invoke(this, invokeDelegate); } else { invokeDelegate = delegate() { label1.Text = successCount + "次相等(成功)"; }; InvokeUtil.Invoke(this, invokeDelegate); } } #endregion #region 发送数据 private void SendData() { if (start) { Thread thread = new Thread(new ParameterizedThreadStart(delegate(object obj) { InvokeDelegate invokeDelegate = delegate() { textBox1.Text = Str; }; InvokeUtil.Invoke(this, invokeDelegate); serialPort1.Write(Data, 0, Data.Length); })); thread.Start(); } } #endregion #region 数据 private static byte[] data = null; /// <summary> /// 数据 /// </summary> private static byte[] Data { get { if (data == null) { data = ASCIIEncoding.UTF8.GetBytes(Str); } return data; } } #endregion #region 获取字符串 private static string str = null; /// <summary> /// 字符串 /// </summary> private static string Str { get { if (str == null) { StringBuilder sb = new StringBuilder(); for (int i = 0; i < 270; i++) { sb.Append("计算机程序"); } str = sb.ToString(); } return str; } } #endregion } }
辅助代码:
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
using System; using System.Collections.Generic; using System.Text; using System.Windows.Forms; namespace Utils { /// <summary> /// 跨线程访问控件的委托 /// </summary> public delegate void InvokeDelegate(); /// <summary> /// 跨线程访问控件类 /// </summary> public class InvokeUtil { /// <summary> /// 跨线程访问控件 /// </summary> /// <param name="ctrl">Form对象</param> /// <param name="de">委托</param> public static void Invoke(Control ctrl, Delegate de) { if (ctrl.IsHandleCreated) { ctrl.BeginInvoke(de); } } } }
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
using System; using System.Collections.Generic; using System.Linq; using System.Text; using Microsoft.Win32; using System.Security.Permissions; using System.IO.Ports; using System.Security; namespace Utils { /// <summary> /// 串口资源工具类 /// </summary> public class SerialPortUtil { #region 获取本机串口列表,包括虚拟串口 /// <summary> /// 获取本机串口列表,包括虚拟串口 /// </summary> public static string[] GetCOMList() { List<string> list = new List<string>(); foreach (string portName in SerialPort.GetPortNames()) { list.Add(portName); } return list.ToArray(); } #endregion #region 从注册表获取本机串口列表 /// <summary> /// 从注册表获取本机串口列表 /// </summary> public static string[] GetPortNames() { RegistryKey localMachine = null; RegistryKey key2 = null; string[] textArray = null; //这里有个断言,判断该注册表项是否存在 new RegistryPermission(RegistryPermissionAccess.Read, @"HKEY_LOCAL_MACHINE\HARDWARE\DEVICEMAP\SERIALCOMM").Assert(); try { localMachine = Registry.LocalMachine; key2 = localMachine.OpenSubKey(@"HARDWARE\DEVICEMAP\SERIALCOMM", false); if (key2 != null) { string[] valueNames = key2.GetValueNames(); textArray = new string[valueNames.Length]; for (int i = 0; i < valueNames.Length; i++) { textArray[i] = (string)key2.GetValue(valueNames[i]); } } } finally { if (localMachine != null) { localMachine.Close(); } if (key2 != null) { key2.Close(); } CodeAccessPermission.RevertAssert(); } if (textArray == null) { textArray = new string[0]; } return textArray; } #endregion } }