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namespace HslCommunication.Core.IMessage
{
/// <summary>
/// 西门子Fetch/Write消息解析协议
/// </summary>
public class FetchWriteMessage : INetMessage
{
/// <summary>
/// 消息头的指令长度
/// </summary>
public int ProtocolHeadBytesLength
{
get
{
return 16;
}
}
/// <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()
{
if (SendBytes != null)
{
if (HeadBytes[5] == 0x04)
{
return 0;
}
else
{
return SendBytes[12] * 256 + SendBytes[13];
}
}
else
{
return 16;
}
}
/// <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>是否合法</returns>
public bool CheckHeadBytesLegal(byte[] token)
{
if (HeadBytes == null) return false;
if (HeadBytes[0] == 0x53 && HeadBytes[1] == 0x35)
{
return true;
}
else
{
return false;
}
}
/// <summary>
/// 获取头子节里的消息标识
/// </summary>
/// <returns>消息标识</returns>
public int GetHeadBytesIdentity()
{
return HeadBytes[3];
}
/// <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; }
}
}
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