protected ReadSingleBlockInfo HandleReadSingleBlockFrame(byte[] frame)
{
ReadSingleBlockInfo info;
if (frame.Length == 0x0A)
{
info = new ReadSingleBlockInfo(I15693BlockLen.Four, frame);
}
else
{
info = new ReadSingleBlockInfo(I15693BlockLen.Eight, frame);
}
ReturnMessage returnCode = CheckFrame(info);
if (returnCode != ReturnMessage.Success)
{
info.ReturnValue = returnCode;
return(info);
}
info.BlockSecurityStatus = frame[3]; //块安全状态编码
if (frame.Length == 0x0A)
{
Array.Copy(frame, 4, info.BlockData, 0, 4); //拷贝数据
}
else
{
Array.Copy(frame, 4, info.BlockData, 0, 8);
}
info.ReturnValue = ReturnMessage.Success;
return(info);
}
/// <summary>
/// 上位机发送该命令读取电子标签中指定块的数据（4或8个字节）和安全状态信息。
/// 该命令可以在address mode和select mode下运行。
/// </summary>
/// <param name="blockLen">卡的数据块所占空间的字节数，4或8</param>
/// <param name="blockNum">绝对块号</param>
/// <returns></returns>
public async Task <ReadSingleBlockInfo> ReadSingleBlockAsync(I15693BlockLen blockLen, byte blockNum)
{
byte[] frame = CreateReadSingleBlockFrame(blockLen, blockNum);
CommunicationReturnInfo cri = await com.SendAsync(frame);
if (cri.ReturnValue != ReturnMessage.Success)
{
ReadSingleBlockInfo ib = new ReadSingleBlockInfo();
ib.SendByte = frame;
ib.ReturnValue = cri.ReturnValue;
ib.ExceptionMessage = cri.ExceptionMessage;
return(ib);
}
ReadSingleBlockInfo info = HandleReadSingleBlockFrame(cri.RecvByte);
info.SendByte = frame;
return(info);
}