104 lines
2.9 KiB
C#
104 lines
2.9 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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namespace MECF.Framework.RT.Core.IoProviders.Siemens.IMessage
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{
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/// <summary>
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/// Modbus-Tcp协议支持的消息解析类
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/// </summary>
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public class ModbusTcpMessage : INetMessage
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{
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/// <summary>
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/// 消息头的指令长度
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/// </summary>
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public int ProtocolHeadBytesLength
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{
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get { return 8; }
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}
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/// <summary>
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/// 从当前的头子节文件中提取出接下来需要接收的数据长度
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/// </summary>
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/// <returns>返回接下来的数据内容长度</returns>
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public int GetContentLengthByHeadBytes( )
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{
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/************************************************************************
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*
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* 说明：为了应对有些特殊的设备，在整个指令的开端会增加一个额外的数据的时候
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*
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************************************************************************/
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if (HeadBytes?.Length >= ProtocolHeadBytesLength)
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{
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int length = HeadBytes[4] * 256 + HeadBytes[5];
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if (length == 0)
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{
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byte[] buffer = new byte[ProtocolHeadBytesLength - 1];
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for (int i = 0; i < buffer.Length; i++)
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{
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buffer[i] = HeadBytes[i + 1];
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}
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HeadBytes = buffer;
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return HeadBytes[5] * 256 + HeadBytes[6] - 1;
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}
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else
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{
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return length - 2;
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}
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}
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else
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{
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return 0;
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}
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}
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/// <summary>
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/// 检查头子节的合法性
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/// </summary>
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/// <param name="token">特殊的令牌，有些特殊消息的验证</param>
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/// <returns>是否成功的结果</returns>
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public bool CheckHeadBytesLegal( byte[] token )
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{
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if (HeadBytes == null) return false;
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if (SendBytes[0] != HeadBytes[0] || SendBytes[1] != HeadBytes[1]) return false;
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return HeadBytes[2] == 0x00 && HeadBytes[3] == 0x00;
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}
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/// <summary>
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/// 获取头子节里的消息标识
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/// </summary>
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/// <returns>消息标识</returns>
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public int GetHeadBytesIdentity( )
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{
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return HeadBytes[0] * 256 + HeadBytes[1];
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}
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/// <summary>
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/// 消息头字节
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/// </summary>
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public byte[] HeadBytes { get; set; }
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/// <summary>
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/// 消息内容字节
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/// </summary>
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public byte[] ContentBytes { get; set; }
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/// <summary>
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/// 发送的字节信息
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/// </summary>
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public byte[] SendBytes { get; set; }
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}
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}
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