/// <summary>
/// 解析协议信息，解析出来的数据都会赋值给每个变量。用户可以通过访问后续的变量来得到相关数据
/// </summary>
/// <returns>成功返回true</returns>
public bool ParseProtocol()
{
if (m_pData == null || m_pData.Count <= 3)
return false;
int buf_id = 0;
byte val = Convert.ToByte(m_pData[buf_id++]);
if (val != 0x7e)
return false;
val = Convert.ToByte(m_pData[m_pData.Count-1]);
if (val != 0x7e)
return false;
//转移还原
ArrayList msg = new ArrayList();
msg = m_pData.GetRange(buf_id, m_pData.Count - 2 - buf_id);
revser_transfer(msg);
//验证checksum
byte chksum = Checksum(msg);
if(chksum != Convert.ToByte(m_pData[m_pData.Count -2]))
return false;
//parse header
if (msg.Count < 12)
return false;
if (m_header == null)
m_header = new HGMessageHeader();
ArrayList header = new ArrayList();
header = msg.GetRange(0, 12);//不管是否需要打包，以防万一都发12个数据过去
if (!m_header.parse(header))
return false;
//parse body
int body_start = m_header.isPackget ? 12 : 8;
ArrayList body = new ArrayList();
body = msg.GetRange(body_start, Convert.ToInt32(m_header.MsgBodySize));
if(body.Count < 2)
return false;
byte body_type = Convert.ToByte(body[1]);
switch (body_type)
{
case 1:
m_body = new HGMessageBodyStartPosition();
break;
case 2:
m_body = new HGMessageBodyEndPosition();
break;
case 3:
m_body = new HGMessageBodyNavigationState();
break;
case 4:
m_body = new HGMessageBodyNavigationStateIdent();
break;
case 11:
m_body = new HGMessageBodyCarInfo();
break;
case 12:
m_body = new HGMessageBodyPosition();
break;
case 13:
m_body = new HGMessageBodyTracePlayback();
break;
}
if (!m_body.parse(body))
return false;
return true;
}
public static HGMessageHeader creat_header(UInt16 id, bool ispacket, UInt16 encrypt)
{
HGMessageHeader head = new HGMessageHeader();
head.ID = id;
head.SequenceNumber = SequenceNumber;
head.isPackget = ispacket;
head.EncryptType = encrypt;
return head;
}