void CNetDDESvrApp::OnDDEStartAdvise(CNetDDESvrSocket& oConnection, CNetDDEPacket& oReqPacket)
{
ASSERT(oReqPacket.DataType() == CNetDDEPacket::DDE_START_ADVISE);
bool bResult = false;
CDDECltConv* pConv = NULL;
CDDELink* pLink = NULL;
HCONV hConv;
uint32 nConvID;
CString strItem;
uint32 nFormat;
bool bAsync;
bool bReqVal;
// Decode message.
CMemStream oStream(oReqPacket.Buffer());
oStream.Open();
oStream.Seek(sizeof(CNetDDEPacket::Header));
oStream.Read(&hConv, sizeof(hConv));
oStream >> nConvID;
oStream >> strItem;
oStream >> nFormat;
oStream >> bAsync;
oStream >> bReqVal;
oStream.Close();
if (App.m_bTraceAdvises)
App.Trace(TXT("DDE_START_ADVISE: %s %s %s"), strItem, CClipboard::FormatName(nFormat), (bAsync) ? TXT("[ASYNC]") : TXT(""));
try
{
// Locate the conversation.
pConv = m_pDDEClient->FindConversation(hConv);
if (pConv != NULL)
{
CNetDDEConv* pNetConv = oConnection.FindNetConv(pConv, nConvID);
ASSERT(pNetConv != NULL);
// Call DDE to create the link.
pLink = pConv->CreateLink(strItem, nFormat);
// Attach to the connection.
pNetConv->m_aoLinks.Add(pLink);
bResult = true;
}
}
catch (CDDEException& e)
{
App.Trace(TXT("DDE_ERROR: %s"), e.twhat());
}
// Sync advise start?
if (!bAsync)
{
// Create response message.
CBuffer oRspBuffer;
CMemStream oRspStream(oRspBuffer);
oRspStream.Create();
oRspStream << bResult;
oRspStream.Close();
// Send response message.
CNetDDEPacket oRspPacket(CNetDDEPacket::DDE_START_ADVISE, oReqPacket.PacketID(), oRspBuffer);
oConnection.SendPacket(oRspPacket);
// Update stats.
++m_nPktsSent;
}
// Failed async advise start?
if ((bAsync) && (!bResult))
{
// Create response message.
CBuffer oRspBuffer;
CMemStream oRspStream(oRspBuffer);
oRspStream.Create();
oRspStream.Write(&hConv, sizeof(hConv));
oRspStream << strItem;
oRspStream << nFormat;
oRspStream << true;
oRspStream.Close();
// Send response message.
CNetDDEPacket oRspPacket(CNetDDEPacket::DDE_START_ADVISE_FAILED, oRspBuffer);
oConnection.SendPacket(oRspPacket);
// Update stats.
++m_nPktsSent;
}
CLinkValue* pLinkValue = NULL;
// Link established AND 1st link AND need to request value?
if ( (bResult) && (pLink->RefCount() == 1) && (bReqVal) )
{
try
{
// Request links current value.
CDDEData oData = pConv->Request(strItem, nFormat);
// Find the links' value cache.
if ((pLinkValue = m_oLinkCache.Find(pConv, pLink)) == NULL)
pLinkValue = m_oLinkCache.Create(pConv, pLink);
ASSERT(pLinkValue != NULL);
// Update links' value cache.
pLinkValue->m_oLastValue = oData.GetBuffer();;
pLinkValue->m_tLastUpdate = CDateTime::Current();
}
catch (CDDEException& e)
{
App.Trace(TXT("DDE_ERROR: %s"), e.twhat());
}
}
// Link established AND not 1st real link?
else if ( (bResult) && (pLink->RefCount() > 1) )
{
// Find last advise value.
pLinkValue = m_oLinkCache.Find(pConv, pLink);
}
// Send initial advise?
if (pLinkValue != NULL)
{
CBuffer oBuffer;
CMemStream oStream(oBuffer);
oStream.Create();
oStream.Write(&hConv, sizeof(hConv));
oStream << strItem;
oStream << nFormat;
oStream << pLinkValue->m_oLastValue;
oStream << true;
oStream.Close();
CNetDDEPacket oPacket(CNetDDEPacket::DDE_ADVISE, oBuffer);
// Send links' last advise data.
oConnection.SendPacket(oPacket);
// Update stats.
++m_nPktsSent;
if (App.m_bTraceUpdates)
{
CString strData;
if (nFormat == CF_TEXT)
strData = pLinkValue->m_oLastValue.ToString(ANSI_TEXT);
else if (nFormat == CF_UNICODETEXT)
strData = pLinkValue->m_oLastValue.ToString(UNICODE_TEXT);
else
strData = CClipboard::FormatName(nFormat);
App.Trace(TXT("DDE_ADVISE: %s %u"), strItem, nFormat);
}
}
}
void CNetDDESvrApp::OnDDERequest(CNetDDESvrSocket& oConnection, CNetDDEPacket& oReqPacket)
{
ASSERT(oReqPacket.DataType() == CNetDDEPacket::DDE_REQUEST);
bool bResult = false;
HCONV hConv;
uint32 nConvID;
CString strItem;
uint32 nFormat;
CBuffer oBuffer;
// Decode message.
CMemStream oStream(oReqPacket.Buffer());
oStream.Open();
oStream.Seek(sizeof(CNetDDEPacket::Header));
oStream.Read(&hConv, sizeof(hConv));
oStream >> nConvID;
oStream >> strItem;
oStream >> nFormat;
oStream.Close();
if (App.m_bTraceRequests)
App.Trace(TXT("DDE_REQUEST: %s %s"), strItem, CClipboard::FormatName(nFormat));
try
{
// Locate the conversation.
CDDECltConv* pConv = m_pDDEClient->FindConversation(hConv);
if (pConv != NULL)
{
// Call DDE to make the request.
CDDEData oData = pConv->Request(strItem, nFormat);
oBuffer = oData.GetBuffer();
bResult = true;
}
}
catch (CDDEException& e)
{
App.Trace(TXT("DDE_ERROR: %s"), e.twhat());
}
// Create response message.
CBuffer oRspBuffer;
CMemStream oRspStream(oRspBuffer);
oRspStream.Create();
oRspStream << bResult;
oRspStream << oBuffer;
oRspStream.Close();
// Send response message.
CNetDDEPacket oRspPacket(CNetDDEPacket::DDE_REQUEST, oReqPacket.PacketID(), oRspBuffer);
oConnection.SendPacket(oRspPacket);
// Update stats.
++m_nPktsSent;
}