UC故事 2011/06/24 - 1（补记2011/12/06）

最新推荐文章于 2025-07-08 16:43:51 发布

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本文深入探讨了聊天应用程序的内部工作原理，重点分析了CChatMainDlg类中的发送数据方法及其实现细节，包括消息格式化、加密过程以及通过CConfSession进行数据发送的过程。此外，还讨论了不同组件之间的交互方式。

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*** 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？