如何解决为Concox GPS追踪器HVT001实现C＃侦听器时出现问题
我正在尝试使用在线提供的代码示例为Concox GPS跟踪器（型号HVT001）实现C＃侦听器，但是由于某种原因，我无法正确获取终端ID（IMEI），因此无法登录后获取任何位置信息
下面是控制台窗口中输入内容的屏幕截图：
您可以看到终端ID显示为乱码，并且没有位置消息出现（我也得到了我无法识别的协议编号）
任何帮助将不胜感激。 完整的代码在这里：https://docs.google.com/document/d/1UsF7ocb5CsCI1rxTcJHLP2eejR6vvboD_M8UeadkVmI/edit?usp=sharing
这是代码段：
public void ProcessMessages()
{
UInt16 sendCRC = 0;
DateTime date;
int year = 0;
int month = 0;
int day = 0;
int hour = 0;
int minute = 0;
int second = 0;
KeyValuePair<List<byte>,StateObject> byteState;
KeyValuePair<UNPACK_STATUS,byte[]> status;
byte[] receiveMessage = null;
StateObject state = null;
byte[] serialNumber = null;
byte[] serverFlagBit = null;
byte[] stringArray = null;
string stringMessage = "";
byte lengthOfCommand = 0;
PROTOCOL_NUMBER protocolNumber = PROTOCOL_NUMBER.NONE;
try
{
Boolean firstMessage = true;
acceptDone.Set();
//loop forever
while (true)
{
allDone.WaitOne();
//read fifo until empty
while (true)
{
//read one connection until buffer doesn't contain any more packets
byteState = ReadWrite(PROCESS_STATE.PROCESS,null,-1);
if (byteState.Value.fifoCount == -1) break;
state = byteState.Value;
while (true)
{
status = Unpack(byteState);
if (status.Key == UNPACK_STATUS.NOT_ENOUGH_BYTES)
break;
if (status.Key == UNPACK_STATUS.ERROR)
{
Console.WriteLine("Error : Bad Receive Message,Data");
break;
}
//message is 2 start bytes + 1 byte (message length) + 1 byte message length + 2 end bytes
receiveMessage = status.Value;
int messageLength = receiveMessage[2];
Console.WriteLine("Status : '{0}',Receive Message : '{1}'",status.Key == UNPACK_STATUS.GOOD_MESSAGE ? "Good" : "Bad",BytesToString(receiveMessage.Take(messageLength + 5).ToArray()));
if (status.Key != UNPACK_STATUS.GOOD_MESSAGE)
{
break;
}
else
{
if (firstMessage)
{
if (receiveMessage[3] != 0x01)
{
Console.WriteLine("Error : Expected Login Message : '{0}'",BytesToString(receiveMessage));
break;
}
firstMessage = false;
}
//skip start bytes,message length. then go back 4 bytes (CRC and serial number)
serialNumber = receiveMessage.Skip(2 + 1 + messageLength - 4).Take(2).ToArray();
protocolNumber = (PROTOCOL_NUMBER)receiveMessage[3];
Console.WriteLine("Protocol Number : '{0}'",protocolNumber.ToString());
switch (protocolNumber)
{
case PROTOCOL_NUMBER.LOGIN_MESSAGE:
serialNumber.CopyTo(loginResponse,4);
sendCRC = crc_bytes(loginResponse.Skip(2).Take(loginResponse.Length - 6).ToArray());
loginResponse[loginResponse.Length - 4] = (byte)((sendCRC >> 8) & 0xFF);
loginResponse[loginResponse.Length - 3] = (byte)((sendCRC) & 0xFF);
string IMEI = Encoding.ASCII.GetString(receiveMessage.Skip(4).Take(messageLength - 5).ToArray());
Console.WriteLine("Received good login message from Serial Number : '{0}',Terminal ID = '{1}'","0x" + serialNumber[0].ToString("X2") + serialNumber[1].ToString("X2"),IMEI);
//byteState.Value.IMEI = IMEI;
Console.WriteLine("Send Message : '{0}'",BytesToString(loginResponse));
Send(state.workSocket,loginResponse);
WriteDBMessageLogin loginMessage = new WriteDBMessageLogin() { message = DATABASE_MESSAGE_TYPE.LOGIN,IMEI = IMEI,date = DateTime.Now };
WriteDBAsync.ReadWriteFifo(WriteDBAsync.Mode.WRITE,loginMessage);
Console.WriteLine("Wrote to database");
break;
case PROTOCOL_NUMBER.LOCATION_DATA:
year = receiveMessage[4];
month = receiveMessage[5];
day = receiveMessage[6];
hour = receiveMessage[7];
minute = receiveMessage[8];
second = receiveMessage[9];
date = new DateTime(2000 + year,month,day,hour,minute,second);
WriteDBMessageLocation locationMessage = new WriteDBMessageLocation();
locationMessage.message = DATABASE_MESSAGE_TYPE.LOCATION;
locationMessage.trackTime = date;
locationMessage.currTime = DateTime.Now;
locationMessage.lattitude = new byte[4];
Array.Copy(receiveMessage,11,locationMessage.lattitude,4);
locationMessage.longitude = new byte[4];
Array.Copy(receiveMessage,15,locationMessage.longitude,4);
locationMessage.speed = receiveMessage[19];
locationMessage.courseStatus = new byte[2];
Array.Copy(receiveMessage,20,locationMessage.courseStatus,2);
locationMessage.IMEI = byteState.Value.IMEI;
WriteDBAsync.ReadWriteFifo(WriteDBAsync.Mode.WRITE,locationMessage);
Console.WriteLine("Received good location message from Serial Number '{0}',Time = '{1}'",date.ToLongDateString());
break;
case PROTOCOL_NUMBER.ALARM_DATA:
//first response
int alarmPacketLen = alarmResponse.Length - 5;
alarmResponse[2] = (byte)(alarmPacketLen & 0xFF);
serialNumber.CopyTo(alarmResponse,alarmPacketLen - 1);
sendCRC = crc_bytes(alarmResponse.Skip(2).Take(alarmPacketLen - 1).ToArray());
alarmResponse[alarmPacketLen + 1] = (byte)((sendCRC >> 8) & 0xFF);
alarmResponse[alarmPacketLen + 2] = (byte)((sendCRC) & 0xFF);
Console.WriteLine("Send Alarm Response Message : '{0}'",BytesToString(alarmResponse));
Send(state.workSocket,alarmResponse);
//second response
year = receiveMessage[4];
month = receiveMessage[5];
day = receiveMessage[6];
hour = receiveMessage[7];
minute = receiveMessage[8];
second = receiveMessage[9];
date = new DateTime(2000 + year,second);
Console.WriteLine("Received good alarm message from Serial Number '{0}',date.ToLongDateString());
int alarmDataAddressPacketLen = alarmDataAddressResponse.Length - 5;
alarmDataAddressResponse[2] = (byte)(alarmDataAddressPacketLen & 0xFF);
serialNumber.CopyTo(alarmDataAddressResponse,alarmDataAddressPacketLen - 1);
sendCRC = crc_bytes(alarmDataAddressResponse.Skip(2).Take(alarmDataAddressPacketLen - 1).ToArray());
alarmDataAddressResponse[alarmDataAddressPacketLen + 1] = (byte)((sendCRC >> 8) & 0xFF);
alarmDataAddressResponse[alarmDataAddressPacketLen + 2] = (byte)((sendCRC) & 0xFF);
Console.WriteLine("Send Alarm Data Address Message : '{0}'",BytesToString(alarmDataAddressResponse));
Send(state.workSocket,alarmDataAddressResponse);
break;
case PROTOCOL_NUMBER.STATUS_INFO:
serialNumber.CopyTo(heartbeatResponse,4);
byte info = receiveMessage[4];
byte voltage = receiveMessage[5];
byte GSMsignalStrength = receiveMessage[6];
UInt16 alarmLanguage = (UInt16)((receiveMessage[7] << 8) | receiveMessage[8]);
ALARM alarm = (ALARM)((info >> 3) & 0x07);
sendCRC = crc_bytes(heartbeatResponse.Skip(2).Take(heartbeatResponse.Length - 6).ToArray());
heartbeatResponse[heartbeatResponse.Length - 4] = (byte)((sendCRC >> 8) & 0xFF);
heartbeatResponse[heartbeatResponse.Length - 3] = (byte)((sendCRC) & 0xFF);
Console.WriteLine("Received good status message from Serial Number : '{0}',INFO : '0x{1}{2}{3}{4}'",info.ToString("X2"),voltage.ToString("X2"),GSMsignalStrength.ToString("X2"),alarmLanguage.ToString("X4"));
Console.WriteLine("Send Message : '{0}'",BytesToString(heartbeatResponse));
Send(state.workSocket,heartbeatResponse);
switch (alarm)
{
//reset cut off alarm
case ALARM.POWER_CUT_ALARM:
int connectOilAndElectricityPacketLen = connectOilAndEletricity.Length - 5;
serialNumber.CopyTo(connectOilAndEletricity,connectOilAndElectricityPacketLen - 1);
sendCRC = crc_bytes(connectOilAndEletricity.Skip(2).Take(connectOilAndEletricity.Length - 6).ToArray());
connectOilAndEletricity[connectOilAndEletricity.Length - 4] = (byte)((sendCRC >> 8) & 0xFF);
connectOilAndEletricity[connectOilAndEletricity.Length - 3] = (byte)((sendCRC) & 0xFF);
serverFlagBit = new byte[4];
Array.Copy(connectOilAndEletricity,5,serverFlagBit,4);
lengthOfCommand = connectOilAndEletricity[4];
stringArray = new byte[lengthOfCommand - 4]; //do not include server flag bit
Array.Copy(connectOilAndEletricity,9,stringArray,lengthOfCommand - 4);
stringMessage = Encoding.ASCII.GetString(stringArray);
Console.WriteLine("Reset Oil and Electricity,Server Flag Bit : '{0}{1}{2}{3}',Message : '{4}'",serverFlagBit[0].ToString("X2"),serverFlagBit[1].ToString("X2"),serverFlagBit[2].ToString("X2"),serverFlagBit[3].ToString("X2"),stringMessage);
Send(state.workSocket,connectOilAndEletricity);
break;
}
break;
case PROTOCOL_NUMBER.STRING_INFO:
lengthOfCommand = receiveMessage[4];
serverFlagBit = new byte[4];
Array.Copy(receiveMessage,4);
stringArray = new byte[lengthOfCommand - 4]; //do not include server flag bit
Array.Copy(receiveMessage,lengthOfCommand - 4);
stringMessage = Encoding.ASCII.GetString(stringArray);
Console.WriteLine("String Message,stringMessage);
break;
} //end switch
}// End if
} //end while
}//end while fifo > 0
allDone.Reset();
}//end while true
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
}
解决方法
首先，Google文档无法共享代码，请记住以下问题。我无法真正测试您的代码，但是从我从这份GPS文档中读到的内容来看。我可以告诉你，您的IMEI问题在于您对它的反序列化不好。
根据文档，登录消息包有18个字节，并按此顺序进行了划分
- 2作为起始位
- 1（表示包裹长度）
- 1作为协议编号（在本例中为协议1或0x01） 以IMEI的
- 8为例，此IMEI 123456789123456的发送方式如下：0x01 0x23 0x45 0x67 0x89 0x120x34 0x56
- 2以获取有关该号码的序列信息
- 2用于错误检查
- 还有2个停车站
这是您要反序列化的行：
string IMEI = Encoding.ASCII.GetString(receiveMessage.Skip(4).Take(messageLength - 5).ToArray());
首先，无需计算您应该服用多少，因为它们始终为8，所以receiveMessage.Skip(4).Take(8).ToArray()
然后编码存在问题，您不想将这些数字转换为它们的ascii字符，只想将要写入的数字作为十六进制字符串，删除生成方法的破折号，并删除前导零（如果存在）
BitConverter.ToString(ByteArr).Replace("-","").TrimStart('0')
这是您的IMEI变量的外观：
string IMEI = BitConverter.ToString(receiveMessage.Skip(4).Take(8).ToArray()).Replace("-","").TrimStart('0');
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