public bool CheckCRC(byte[] crc, int endBeforeLength)
{
byte[] checkData = new byte[endBeforeLength];
Array.Copy(Data, 0, checkData, 0, endBeforeLength);
string str = BytesUtil.ToHexString(CRCUtil.CRC16(checkData));
return(str.Equals(BytesUtil.ToHexString(crc)));
}
public RecieveMessage Read()
{
RecieveMessage message = new RecieveMessage();
message.Content = BytesUtil.ToHexString(BaseDecode.Data);
message.CenterCode = CenterCode();
message.ClientCode = ClientCode();
message.SendTime = SendTime();
message.Serial = Serial();
message.FunctionCode = FunctionCode();
message.DataLength = DataLength();
message.CRC = CRC(message.DataLength + 21);
message.IsChecked = false;
//只有数据主体起始符和结束符位置都正确，才会继续解析数据主体
if (!BaseDecode.IsChecked)
{
return(message);
}
//心跳包不进行解析
if (!message.FunctionCode.Equals("F2"))
{
byte[] bodyData = Body(message.DataLength);
message.Body = bodyData;
//如果是召测数据或者客户端自报数据，数据主体以采集时间开头，截取后在进行解码
if (message.FunctionCode.Equals("B0") || message.FunctionCode.Equals("C0"))
{
message.DataTime = DataTime(bodyData);
//如果不是以E0E0开头，则说明包体内容错误，无需向下解析
if (!BaseDecode.IsChecked)
{
return(message);
}
bodyData = BytesUtil.SubBytes(bodyData, 7);
}
if (message.FunctionCode.Equals("B3"))
{
ElementB3Decode b3Decode = new ElementB3Decode(bodyData);
message.Data = b3Decode.Read();
}
else
{
ElementDecode decode = new ElementDecode(bodyData);
List <Element> dataList = decode.ReadAll();
if (message.FunctionCode.Equals("B0") || message.FunctionCode.Equals("C0"))
{
message.Data = dataList.Select(q => new B0C0Element(q)).ToList();
}
else if (message.FunctionCode.Equals("B1"))
{
message.Data = dataList.Select(q => new B1Element(q)).ToList();
}
else if (message.FunctionCode.Equals("B2"))
{
message.Data = dataList.Select(q => new B2Element(q)).ToList();
}
}
}
bool isChecked = BaseDecode.IsChecked;
//如果以上都通过，则校验最后的CRC码
if (isChecked)
{
isChecked = BaseDecode.CheckCRC(message.CRC, message.DataLength + 21);
}
message.IsChecked = isChecked;
return(message);
}