实例介绍
【实例简介】
【实例截图】
【核心代码】
using System; using System.Net; using System.Net.Sockets; using System.Threading; using System.Threading.Tasks; namespace CableRobot.Fins { /// <summary> /// Allows to write and read PLC memory 允许读写PLC内存 /// </summary> public class FinsClient : IDisposable { /// <summary> /// 声明类对象 /// </summary> private readonly CancellationTokenSource _cancellationTokenSource; private readonly CancellationToken _cancellationToken; private readonly UdpClient _udpClient; private readonly FinsResponse[] _responses = new FinsResponse[256]; private readonly Thread _readerThread; private readonly object _lockObject = new object(); private byte _sid; public FinsClient(IPEndPoint remoteIpEndPoint)///// { ///创建一个UdpClient对象,0表示系统自动分配发送端口 _udpClient = new UdpClient(); _udpClient.Connect(remoteIpEndPoint); _cancellationTokenSource = new CancellationTokenSource(); _cancellationToken = _cancellationTokenSource.Token;///用于监听是否取消每一个任务或线程 ///创建 _readerThread线程。此处用线程是为了避免阻塞 _readerThread = new Thread(ReadWorker); ///调用Staet()函数启动 _readerThread线程 _readerThread.Start(); ///int Array.Length函数:获取数组所有维度中元素的总数 for (int i = 0; i < _responses.Length; i ) _responses[i] = new FinsResponse((byte)i, null); Timeout = TimeSpan.FromSeconds(2); } /// <summary> /// Gets or sets response timeout设置相应超时 /// </summary> public TimeSpan Timeout { get; set; }///// public void Close()///// { _cancellationTokenSource.Cancel(); ///阻塞调用线程,直到此实例所表示的线程终止, _readerThread.Join(); } /// <summary> /// Syncroniously reads specified number of ushorts starting from specified address in data memory /// 从数据内存中指定的地址开始同步读取指定数量的ushort /// </summary> /// <param name="startAddress">Address to start to read from</param> /// <param name="count">Number of ushorts to read</param> /// <returns>Read data</returns> public ushort[] ReadData(ushort startAddress, ushort count)///// { var sid = IncrementSid(); var cmd = FinsDriver.ReadDataCommand(new Header(sid, true), startAddress, count); return Read(sid, cmd); } /// <summary> /// Syncroniously reads specified number of ushorts starting from specified address in work memory /// </summary> /// <param name="startAddress">Address to start to read from</param> /// <param name="count">Number of ushorts to read</param> /// <returns>Read data</returns> public ushort[] ReadWork(ushort startAddress, ushort count)///// { var sid = IncrementSid(); var cmd = FinsDriver.ReadWorkCommand(new Header(sid, true), startAddress, count); return Read(sid, cmd); } /// <summary> /// Syncroniously writes specified data to specified address of data memory /// </summary> /// <param name="startAddress">Address to start write to</param> /// <param name="data">Data to write</param> public void WriteData(ushort startAddress, ushort[] data)///// { var sid = IncrementSid(); var cmd = FinsDriver.WriteDataCommand(new Header(sid, true), startAddress, data); Write(sid, cmd); } /// <summary> /// Syncroniously writes specified data to specified address of work memory /// </summary> /// <param name="startAddress">Address to start write to</param> /// <param name="data">Data to write</param> public void WriteWork(ushort startAddress, ushort[] data)///// { var sid = IncrementSid(); var cmd = FinsDriver.WriteWorkCommand(new Header(sid, true), startAddress, data); Write(sid, cmd); } /// <summary> /// Asynchronously reads specified number of ushorts starting from specified address in data memory /// </summary> /// <param name="startAddress">Address to start to read from</param> /// <param name="count">Number of ushorts to read</param> /// <returns>Read data</returns> public async Task<ushort[]> ReadDataAsync(ushort startAddress, ushort count) { var sid = IncrementSid(); var cmd = FinsDriver.ReadDataCommand(new Header(sid, true), startAddress, count); return (await CommandAsync(sid, cmd)).Data; } /// <summary> /// Asynchronously writes specified data to specified address of data memory /// </summary> /// <param name="startAddress">Address to start to write to</param> /// <param name="data">Data to write</param> public async Task WriteDataAsync(ushort startAddress, ushort[] data) { var sid = IncrementSid(); var cmd = FinsDriver.WriteDataCommand(new Header(sid, true), startAddress, data); await CommandAsync(sid, cmd); } /// <summary> /// Writes specified data to specified address of data memory without /// </summary> /// <param name="startAddress">Address to start to read from</param> /// <param name="count">Number of ushorts to read</param> public void WriteDataNoResponse(ushort startAddress, ushort[] data) { var sid = IncrementSid(); var cmd = FinsDriver.WriteDataCommand(new Header(sid, false), startAddress, data); _udpClient.SendAsync(cmd, cmd.Length); } private byte IncrementSid() { byte sid; lock (_lockObject) { _sid ; sid = _sid; } _responses[sid].Reset(); return sid; } private ushort[] Read(byte sid, byte[] cmd) { if (_udpClient.Send(cmd, cmd.Length) != cmd.Length) throw new Exception(); if (!_responses[sid].WaitEvent.WaitOne(Timeout)) throw new TimeoutException(); return _responses[sid].Data; } private void Write(byte sid, byte[] cmd) { if (_udpClient.Send(cmd, cmd.Length) != cmd.Length) throw new Exception(); if (!_responses[sid].WaitEvent.WaitOne(Timeout)) throw new TimeoutException(); } private async Task<FinsResponse> CommandAsync(byte sid, byte[] cmd) { if (await _udpClient.SendAsync(cmd, cmd.Length) != cmd.Length) throw new Exception(); if (!_responses[sid].WaitEvent.WaitOne(Timeout)) throw new TimeoutException(); return _responses[sid]; } private void ReadWorker() { try { while (true) { var task = _udpClient.ReceiveAsync(); ///返回由远程主机异步发送的UDP数据报 task.Wait(_cancellationToken); if (task.IsFaulted) throw new AggregateException(task.Exception); FinsDriver.ProcessResponse(task.Result, _responses); } } catch (OperationCanceledException) { } } public void Dispose() { _cancellationTokenSource?.Cancel(); _readerThread?.Join(); _udpClient?.Dispose(); } } }
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