ModbusTcpMessage.cs
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namespace HslCommunication.Core.IMessage
{
/// <summary>
/// Modbus-Tcp协议支持的消息解析类
/// </summary>
public class ModbusTcpMessage : INetMessage
{
/// <summary>
/// 消息头的指令长度
/// </summary>
public int ProtocolHeadBytesLength
{
get { return 8; }
}
/// <summary>
/// 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
/// </summary>
/// <returns>返回接下来的数据内容长度</returns>
public int GetContentLengthByHeadBytes()
{
/************************************************************************
*
* 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
*
************************************************************************/
if (HeadBytes?.Length >= ProtocolHeadBytesLength)
{
int length = HeadBytes[4] * 256 + HeadBytes[5];
if (length == 0)
{
byte[] buffer = new byte[ProtocolHeadBytesLength - 1];
for (int i = 0; i < buffer.Length; i++)
{
buffer[i] = HeadBytes[i + 1];
}
HeadBytes = buffer;
return HeadBytes[5] * 256 + HeadBytes[6] - 1;
}
else
{
return length - 2;
}
}
else
{
return 0;
}
}
/// <summary>
/// 检查头子节的合法性
/// </summary>
/// <param name="token">特殊的令牌，有些特殊消息的验证</param>
/// <returns>是否成功的结果</returns>
public bool CheckHeadBytesLegal(byte[] token)
{
if (HeadBytes == null) return false;
if (SendBytes[0] != HeadBytes[0] || SendBytes[1] != HeadBytes[1]) return false;
return HeadBytes[2] == 0x00 && HeadBytes[3] == 0x00;
}
/// <summary>
/// 获取头子节里的消息标识
/// </summary>
/// <returns>消息标识</returns>
public int GetHeadBytesIdentity()
{
return HeadBytes[0] * 256 + HeadBytes[1];
}
/// <summary>
/// 消息头字节
/// </summary>
public byte[] HeadBytes { get; set; }
/// <summary>
/// 消息内容字节
/// </summary>
public byte[] ContentBytes { get; set; }
/// <summary>
/// 发送的字节信息
/// </summary>
public byte[] SendBytes { get; set; }
}
}