问题描述

返回值哪里有问题。。

public ErrorCode InquiryCard(ref string SerialNo)
{
if (!_Active) return ErrorCode.DeviceNoOpen;
try
{
//生成寻卡待发命令
byte[] send = new byte[6];
send[0] = 0xFE;
send[1] = 0x05;
send[2] = 0x10;
send[3] = 0x52;
//计算检校位

            byte[] CrcByteData = new byte[3];            Array.Copy(send 1 CrcByteData 0 CrcByteData.Length);            int cRc16 = CRC_16.GetCRC_16(CrcByteData);            //取出高8位和低8位            byte _sendHight = HiByte(cRc16);            byte _sendLower = LoByte(cRc16);            send[4] = _sendHight;            send[5] = _sendLower;            //发送命令            _SerialPort.Write(send 0 send.Length);            //接收命令            byte[] receivedata = GetPortStream(7);            //根据协议比对询卡是否成功            if (receivedata[2] == 0x00)//如果寻卡成功            {                /* *********************                 * 寻卡成功后则获取卡号*                 ***********************/                //生成获取卡号待发命令                byte[] send1 = new byte[7];                send1[0] = 0xFE;                send1[1] = 0x06;                send1[2] = 0x11;                send1[3] = 0x93;                send1[4] = 0x00;                //计算检校位                byte[] CrcByteData1 = new byte[4];                Array.Copy(send1 1 CrcByteData1 0 CrcByteData1.Length);                int cRc16_1 = CRC_16.GetCRC_16(CrcByteData1);                //取出高8位和低8位                byte _sendHight1 = HiByte(cRc16_1);                byte _sendLower1 = LoByte(cRc16_1);                send1[5] = _sendHight1;                send1[6] = _sendLower1;                //发送命令                _SerialPort.Write(send1 0 send1.Length);                //接收命令                byte[] receivedata1 = GetPortStream(9);                //根据协议比对询卡是否成功                if (receivedata1[2] == 0x00)//如果获取卡号成功                {                    Array.Copy(receivedata1 3 _CardNumbers 0 _CardNumbers.Length);                    SerialNo = ByteArrayToHexString(_CardNumbers);                    /* ***********************                     * 获取卡号成功后则选中卡*                     *************************/                    //生成选中卡待发命令                    byte[] send2 = new byte[10];                    send2[0] = 0xFE;                    send2[1] = 0x09;                    send2[2] = 0x13;                    send2[3] = 0x93;                    send2[4] = _CardNumbers[0];                    send2[5] = _CardNumbers[1];                    send2[6] = _CardNumbers[2];                    send2[7] = _CardNumbers[3];                    //计算检校位                    byte[] CrcByteData2 = new byte[7];                    Array.Copy(send2 1 CrcByteData2 0 CrcByteData2.Length);                    int cRc16_2 = CRC_16.GetCRC_16(CrcByteData2);                    //取出高8位和低8位                    byte _sendHight2 = HiByte(cRc16_2);                    byte _sendLower2 = LoByte(cRc16_2);                    send2[8] = _sendHight2;                    send2[9] = _sendLower2;                    //发送命令                    _SerialPort.Write(send2 0 send2.Length);                    //接收命令                    byte[] receivedata2 = GetPortStream(6);                    //根据协议比对询卡是否成功                    if (receivedata2[2] == 0x00)                    {                        return ErrorCode.Success;                    }                }            }               else if (receivedata[2] == 0xFF)                {                    return ErrorCode.Fail;                }                else                {                    return ErrorCode.PacketLoss;                }        }        catch        {            return ErrorCode.Abnormal;        }    }

解决方案

“if (receivedata1[2] == 0x00)//如果获取卡号成功”进不来，你从哪回？“if (receivedata2[2] == 0x00)”进不来，你又从哪回？

解决方案二：
grep 返回值问题
CreateIoCompletionPort 返回值的问题
fread 返回值的问题