protected InventoryInfo HandleInventoryFrame(byte[] frame)
{
InventoryInfo info = new InventoryInfo(frame);
//由于查询成功可能会返回其它的 Status 值，所以帧检查需要单独写
//如果帧长度不对，则检查不通过
if (frame[0] != frame.Length - 1)
{
info.ReturnValue = ReturnMessage.HF_FrameLenError;
return(info);
}
//检查读写器地址
if (frame[1] != Com_adr && frame[1] != 0xFF)
{
info.ReturnValue = ReturnMessage.HF_ReaderAddrError;
return(info);
}
//CRC校验
UInt16 crc = FrameBase.GetCRC(frame);
UInt16 a = BitConverter.ToUInt16(frame, frame.Length - 2);
UInt16 b = FrameBase.Reverse(crc);
if (BitConverter.ToUInt16(frame, frame.Length - 2) != crc)
{
info.ReturnValue = ReturnMessage.HF_CRCError;
return(info);
}
//压入结果状态码
info.SetStatus();
if (info.Status > 0x04)
{
info.ReturnValue = ReturnMessage.HF_StatusError;
return(info);
}
info.Num = frame[4];
var epcSet = info.EPCSet;
int index = 5;
for (int i = 0; i < info.Num; i++)
{
InventoryInfo.EPCInfo epc = new InventoryInfo.EPCInfo();
int len = frame[index++];
epc.EPCLen = (byte)(len / 2);
epc.EPC = new byte[len];
Array.Copy(frame, index, epc.EPC, 0, len);
epcSet.Add(epc);
index += len;
}
info.ReturnValue = ReturnMessage.Success;
return(info);
}
/// <summary>
/// 询查单张标签
/// </summary>
/// <returns></returns>
public async Task <InventoryInfo> InventorySingleAsync()
{
byte[] frame = CreateInventorySingleFrame();
CommunicationReturnInfo cri = await com.SendAsync(frame);
if (cri.ReturnValue != ReturnMessage.Success)
{
InventoryInfo ii = new InventoryInfo();
ii.SendByte = frame;
ii.ReturnValue = cri.ReturnValue;
ii.ExceptionMessage = cri.ExceptionMessage;
return(ii);
}
InventoryInfo info = HandleInventoryFrame(cri.RecvByte);
info.SendByte = frame;
return(info);
}
