/// <summary>
/// 检测响应包类型
/// </summary>
/// <param name="bArrBag"></param>
/// <param name="strErrMsg"></param>
/// <returns></returns>
public static ECommandType GetResponseType(byte[] bArrBag, out string strErrMsg)
{
ECommandType eResponseType = ECommandType.UnKnown;
strErrMsg = "";
//数据校验
if (bArrBag != null && bArrBag.Length >= 6)
{
//1.数据CRC8校验
byte bCRCResult = CRC8A.GetCRC8(bArrBag, 0, bArrBag.Length - 1);
byte bCRCSource = bArrBag[bArrBag.Length - 1];
if (bCRCSource.Equals(bCRCResult))
{
//2.识别帧起始符
if (bArrBag[0].Equals(0x55) && bArrBag[1].Equals(0xFF))
{
//3.识别数据长度
byte[] bArrDataLength = new byte[4];
bArrDataLength[0] = bArrBag[3];
bArrDataLength[1] = bArrBag[2];
uint iDataLength = Functions.ConverToUInt(bArrDataLength);//低字节在前，高字节在后
if (bArrBag.Length == (iDataLength + 2 + 2 + 1))
{
//4.识别命令包类型
eResponseType = GetCommandTypeByCode(bArrBag[4]);
if (eResponseType.Equals(ECommandType.UnKnown))
{
strErrMsg = "数据包指令位不正确！";
}
else if (eResponseType.Equals(ECommandType.SwipingCard))
{
if (bArrBag.Length < 23)
{
eResponseType = ECommandType.UnKnown;
}
}
else if (eResponseType.Equals(ECommandType.PingResponse))
{
if (bArrBag.Length < 18)
{
eResponseType = ECommandType.UnKnown;
}
}
}
else
{
strErrMsg = "数据长度位与数据包实际长度不一致！";
}
}
else if (bArrBag[0].Equals(0x55) && bArrBag[1].Equals(0xAA))
{
//刷卡头链路层ACK
eResponseType = ECommandType.UnKnown;
if (bArrBag.Length >= 16)
{
if (bArrBag[4].Equals(0x21))
{
eResponseType = ECommandType.CardHeadDeviceACK;
}
if (bArrBag[4].Equals(0x92))
{
eResponseType = ECommandType.MainDeviceACK4PingResponse;
}
}
}
else
{
strErrMsg = "帧起始符不正确！";
}
}
else
{
strErrMsg = "CRC校验不合法！";
}
}
else
{
strErrMsg = "数据长度不正确！";
}
return(eResponseType);
}
