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XingCheng3
323
SCADA/Core/BarcodeScanner.cs
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323
SCADA/Core/BarcodeScanner.cs
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using System;
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using System.IO.Ports;
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using System.Text;
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using System.Threading.Tasks;
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namespace MesWork
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{
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/// <summary>
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/// 单把扫码枪的串口通信封装
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/// 包含数据接收（缓冲+空闲提交）、防抖、断线自动重连
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/// </summary>
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public class BarcodeScanner : IDisposable
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{
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// ── 基本属性 ──
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/// <summary>关联工位号（OP10/OP20）</summary>
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public string OpName { get; }
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/// <summary>当前COM口</summary>
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public string ComPort { get; private set; }
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/// <summary>是否已连接</summary>
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public bool IsConnected
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{
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get { try { return _serial != null && _serial.IsOpen; } catch { return false; } }
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}
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/// <summary>最近一次扫到的条码</summary>
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public string LastBarcode { get; private set; } = "";
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/// <summary>最近一次扫码时间</summary>
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public DateTime? LastScanTime { get; private set; }
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// ── 事件 ──
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/// <summary>扫码完成事件（opName, barcode）</summary>
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public event Action<string, string> BarcodeReceived;
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/// <summary>日志事件（message），由外部接入系统日志</summary>
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public event Action<string> Log;
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// ── 私有字段 ──
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private SerialPort _serial;
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private readonly int _baudRate;
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private readonly object _bufferLock = new object();
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private readonly StringBuilder _buffer = new StringBuilder(256);
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private System.Windows.Forms.Timer _flushTimer;
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private const int FlushIntervalMs = 60;
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// 防抖
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private string _lastDebounceCode = "";
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private DateTime _lastDebounceTime = DateTime.MinValue;
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private const int DebounceMs = 500;
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// 断线重连
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private System.Windows.Forms.Timer _reconnectTimer;
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private volatile bool _reconnecting = false;
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private bool _disposed = false;
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public BarcodeScanner(string opName, int baudRate = 9600)
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{
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OpName = opName;
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_baudRate = baudRate;
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}
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/// <summary>
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/// 连接指定COM口
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/// </summary>
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public bool Connect(string comPort)
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{
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if (string.IsNullOrWhiteSpace(comPort) || comPort.Length < 3)
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return false;
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try
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{
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Disconnect();
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ComPort = comPort;
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_serial = new SerialPort
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{
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PortName = comPort,
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BaudRate = _baudRate,
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Parity = Parity.None,
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StopBits = StopBits.One,
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ReadTimeout = 1000,
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DtrEnable = true
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};
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_serial.DataReceived += Serial_DataReceived;
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_serial.Open();
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// 空闲提交定时器
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if (_flushTimer == null)
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{
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_flushTimer = new System.Windows.Forms.Timer { Interval = FlushIntervalMs };
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_flushTimer.Tick += FlushTimer_Tick;
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}
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// 断线重连定时器（每3秒检测）
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if (_reconnectTimer == null)
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{
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_reconnectTimer = new System.Windows.Forms.Timer { Interval = 3000 };
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_reconnectTimer.Tick += ReconnectTimer_Tick;
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}
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_reconnectTimer.Start();
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Log?.Invoke($"[{OpName}] 扫码枪已连接 ({comPort})");
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return true;
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}
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catch (Exception ex)
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{
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Log?.Invoke($"[{OpName}] 扫码枪连接失败 ({comPort})：{ex.Message}");
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return false;
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}
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}
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/// <summary>
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/// 断开连接
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/// </summary>
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public void Disconnect()
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{
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try
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{
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_reconnectTimer?.Stop();
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_flushTimer?.Stop();
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if (_serial != null)
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{
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_serial.DataReceived -= Serial_DataReceived;
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if (_serial.IsOpen) _serial.Close();
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_serial.Dispose();
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_serial = null;
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}
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}
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catch { }
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}
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/// <summary>
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/// 测试当前COM口是否可连接
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/// </summary>
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public bool TestConnection(string comPort)
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{
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try
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{
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using (var sp = new SerialPort(comPort, _baudRate))
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{
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sp.Open();
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sp.Close();
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return true;
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}
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}
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catch { return false; }
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}
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// ── 串口数据接收 ──
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private void Serial_DataReceived(object sender, SerialDataReceivedEventArgs e)
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{
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try
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{
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if (_serial == null || !_serial.IsOpen) return;
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int bytesToRead = _serial.BytesToRead;
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if (bytesToRead <= 0) return;
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byte[] buf = new byte[bytesToRead];
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_serial.Read(buf, 0, bytesToRead);
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string chunk = Encoding.UTF8.GetString(buf, 0, bytesToRead);
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lock (_bufferLock)
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{
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_buffer.Append(chunk);
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string acc = _buffer.ToString();
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// 按换行符（\r \n）拆分完整条码
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int startIndex = 0;
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for (int i = 0; i < acc.Length; i++)
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{
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if (acc[i] == '\r' || acc[i] == '\n')
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{
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int len = i - startIndex;
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if (len > 0)
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{
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string line = acc.Substring(startIndex, len).Trim();
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if (!string.IsNullOrEmpty(line))
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SubmitBarcode(line);
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}
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startIndex = i + 1;
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}
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}
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if (startIndex >= acc.Length)
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_buffer.Clear();
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else if (startIndex > 0)
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{
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_buffer.Clear();
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_buffer.Append(acc.Substring(startIndex));
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}
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// 无换行 → 启动空闲定时器
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if (_buffer.Length > 0)
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{
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try
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{
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_flushTimer?.Stop();
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_flushTimer?.Start();
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}
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catch { }
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}
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}
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}
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catch (Exception ex)
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{
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if (ex is System.IO.IOException || ex is InvalidOperationException)
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{
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Log?.Invoke($"[{OpName}] 扫码枪通信异常，尝试重连：{ex.Message}");
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TryReopen();
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}
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}
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finally
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{
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try { _serial?.DiscardInBuffer(); } catch { }
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}
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}
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// 空闲超时提交缓冲区
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private void FlushTimer_Tick(object sender, EventArgs e)
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{
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_flushTimer.Stop();
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string toSend;
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lock (_bufferLock)
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{
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toSend = _buffer.ToString().Trim();
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_buffer.Clear();
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}
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if (!string.IsNullOrEmpty(toSend))
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SubmitBarcode(toSend);
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}
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// 提交条码（含防抖）
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private void SubmitBarcode(string barcode)
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{
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barcode = barcode.Replace("\r", "").Replace("\n", "").Replace("\0", "").Trim();
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if (string.IsNullOrEmpty(barcode)) return;
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// 防抖
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var now = DateTime.Now;
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if (barcode == _lastDebounceCode && (now - _lastDebounceTime).TotalMilliseconds < DebounceMs)
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return;
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_lastDebounceCode = barcode;
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_lastDebounceTime = now;
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// 更新状态
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LastBarcode = barcode;
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LastScanTime = now;
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// 触发事件
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BarcodeReceived?.Invoke(OpName, barcode);
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}
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/// <summary>
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/// 手动发送条码（模拟扫码触发，走完整业务流程）
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/// </summary>
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public void ManualSend(string barcode)
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{
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if (!string.IsNullOrWhiteSpace(barcode))
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SubmitBarcode(barcode.Trim());
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}
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// ── 断线重连 ──
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private void ReconnectTimer_Tick(object sender, EventArgs e)
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{
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if (_reconnecting || string.IsNullOrWhiteSpace(ComPort)) return;
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if (IsConnected) return;
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_reconnecting = true;
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Task.Run(() =>
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{
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try { TryReopen(); }
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catch { }
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finally { _reconnecting = false; }
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});
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}
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private void TryReopen()
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{
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try
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{
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string[] ports = SerialPort.GetPortNames();
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bool exists = Array.Exists(ports, p => string.Equals(p, ComPort, StringComparison.OrdinalIgnoreCase));
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if (!exists) return;
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if (_serial != null)
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{
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try { if (_serial.IsOpen) _serial.Close(); } catch { }
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try { _serial.Dispose(); } catch { }
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}
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_serial = new SerialPort
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{
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PortName = ComPort,
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BaudRate = _baudRate,
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Parity = Parity.None,
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StopBits = StopBits.One,
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ReadTimeout = 1000,
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DtrEnable = true
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};
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_serial.DataReceived += Serial_DataReceived;
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_serial.Open();
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Log?.Invoke($"[{OpName}] 扫码枪自动重连成功 ({ComPort})");
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}
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catch (Exception ex)
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{
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Log?.Invoke($"[{OpName}] 扫码枪自动重连失败 ({ComPort})：{ex.Message}");
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}
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}
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public void Dispose()
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{
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if (_disposed) return;
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_disposed = true;
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Disconnect();
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_flushTimer?.Dispose();
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_reconnectTimer?.Dispose();
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}
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}
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}
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