using System;
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using WIDESEAWCS_S7Simulator.Core.Interfaces;
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namespace WIDESEAWCS_S7Simulator.Core.Memory
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{
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/// <summary>
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/// C区（计数器区/Counter）实现
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/// 用于模拟西门子S7 PLC的计数器区域
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/// 每个计数器占用2字节，存储计数器的当前值
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/// </summary>
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public class CRegion : MemoryRegion, IMemoryRegion
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{
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/// <summary>
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/// 标识对象是否已被释放
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/// </summary>
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private bool _disposed = false;
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/// <summary>
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/// 区域类型
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/// </summary>
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public override string RegionType => "C";
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/// <summary>
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/// 每个计数器占用的字节数（S7计数器为2字节）
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/// </summary>
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private const int CounterSize = 2;
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/// <summary>
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/// 构造函数
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/// </summary>
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/// <param name="counterCount">计数器数量</param>
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public CRegion(int counterCount) : base(counterCount * CounterSize)
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{
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}
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/// <summary>
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/// 读取计数器值
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/// </summary>
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/// <param name="counterNumber">计数器号（从1开始）</param>
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/// <returns>计数器值</returns>
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public ushort ReadCounter(ushort counterNumber)
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{
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if (_disposed)
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throw new ObjectDisposedException(nameof(CRegion));
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ushort offset = (ushort)((counterNumber - 1) * CounterSize);
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var data = Read(offset, CounterSize);
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return (ushort)((data[0] << 8) | data[1]);
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}
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/// <summary>
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/// 写入计数器值
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/// </summary>
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/// <param name="counterNumber">计数器号（从1开始）</param>
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/// <param name="value">计数器值</param>
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public void WriteCounter(ushort counterNumber, ushort value)
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{
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if (_disposed)
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throw new ObjectDisposedException(nameof(CRegion));
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ushort offset = (ushort)((counterNumber - 1) * CounterSize);
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var data = new byte[] { (byte)(value >> 8), (byte)(value & 0xFF) };
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Write(offset, data);
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}
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/// <summary>
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/// 释放资源
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/// </summary>
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/// <param name="disposing">是否正在释放托管资源</param>
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protected override void Dispose(bool disposing)
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{
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if (!_disposed)
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{
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if (disposing)
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{
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// 释放托管资源
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}
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_disposed = true;
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}
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base.Dispose(disposing);
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}
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}
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}
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