UC故事 2011/06/24 - 1（补记2011/12/06）

*** Understanding Chat Flow ***

 

0. 杂想杂问

 

1. CChatMainDlg

CChatComponent m_component;

CChatSession m_session;

 

onBtnSend() -> m_session.SendChatData();

 

* Sendata()

 

void CChatMainDlg::SendData(BOOL bPublic, CString& cSender, CString& cMessage)
{
 if (m_chatsession.IsConnect())
 {
  CHARFORMAT cf;
  cf.cbSize = sizeof(CHARFORMAT);
  cf.dwMask = CFM_CHARSET | CFM_FACE;
  m_input.GetDefaultCharFormat(cf);

  CChatDataPdu pdu;
  pdu.m_bPublic = bPublic;
  pdu.m_cSender = cSender;
  pdu.m_cMessage = cMessage;
  pdu.m_bChatSet = cf.bCharSet;
  pdu.m_cFaceName = cf.szFaceName;

  CRtMessageBlock aData(pdu.GetLength());
  pdu.Encode(aData);

  int nLen = pdu.GetLength();
  LPCSTR lpData = aData.GetTopLevelReadPtr();

  if (bPublic == FALSE && m_bPublic == FALSE)
  {
   InfoUser_ID user(m_idChatUser);
   m_chatsession.SendChatData(nLen, (const LPBYTE)lpData, &user);
  }
  else
  {
   m_chatsession.SendChatData(nLen, (const LPBYTE)lpData);
  }

 }
}

 

Q：只在这里涉及MessageBlock，底层不再涉及？底层只涉及指针与长度？

 

2. CChatSession

 

class CChatSession : public ISessionClientSink
{

  ...

protected:
 CRtAutoPtr<ISessionClient> m_pSession;
 CChatMainDlg& m_chatDlg;

 CInfoRosterInfo m_userInfo;

 InfoChannel_ID m_Channel_All;
 InfoChannel_ID m_Channel_AllUser;
 InfoChannel_ID m_Channel_AllLocalPort;

 CSessRosterList m_userMgr;
 DWORD m_dwStatus;

}

 

Q: Why没有实现ISeessionClient接口，而是有一个成员变量m_pSession？

 

CmResult CChatSession::InitSession(ISessionClient* pSession)
{
 RT_ASSERTE(m_pSession == NULL);
 if (m_pSession)
  return CHAT_SESS_ALREADY_EXIST;

 CmResult rt = CHAT_SESS_CALL_FAIL;
 m_pSession = pSession;

 RT_ASSERTE(m_pSession);
 if (m_pSession)
  rt = m_pSession->OpenWith(this);

 return rt;
}

 

Q: ISessionClient的实现类究竟有哪些？只有CConfSession？

 

3. ISessionClient

 

 virtual RtResult SendData(
  const InfoChannel_ID& destID,
  DATA_Priority priority,
  DATAFLAG dataFlag,                // What's this ?
  DWORD length,
  const LPBYTE lpData) = 0;

 

4. CConfSession

 

RtResult CConfSession::SendData(
  const InfoChannel_ID& destID,
  DATA_Priority priority,
  DATAFLAG dataFlag,
  DWORD length,
  const LPBYTE lpData)

{

...

 if (length > 8 * 1024)
 {
  RT_WARNING_TRACE_THIS("CConfSession::SendData, sess type="<<m_sessKey.nSessionType<<": pdu too long! len="
   <<length<<",dataFlag="<<dataFlag<<",destID="<<destID);
 }

...

 return SendData_i(destID, priority, dataFlag, length, lpData);

}

 

 

RtResult CConfSession::SendData_i(...)

 

{
 LPBYTE lpOutData = lpData;
 DWORD  outLength = length;
 if (m_sessSecurity)
 {
  EncryptData_i(lpData, length, lpOutData, outLength,
   m_securityBuff, m_securityBlen);
 }
 return SessSenddData(destID, priority, dataFlag, outLength, lpOutData);
}

 

RtResult CConfSession::SessSenddData(...)

 

{
 CRtMessageBlock aData(
  length, (LPCSTR)lpData, CRtMessageBlock::DONT_DELETE, length);
 CInfoSvrSessApplicationData pdu(
  GetUserID(), destID, priority, dataFlag, aData);
 return m_conference.SendData(&pdu, priority, dataFlag);
}

 

Q：Why会从CConference发出最终信息？这里的PDU干嘛的？

 

 

5. CInfoSID

Q：如何理解？