private IntPtr ODdeNetCallback(int uType, int uFmt, IntPtr hConv, IntPtr hsz1, IntPtr hsz2, IntPtr hData, IntPtr dwData1, IntPtr dwData2)
{
// Create a new transaction object that will be dispatched to a DdemlClient, DdemlServer, or ITransactionFilter.
DdemlTransaction t = new DdemlTransaction(uType, uFmt, hConv, hsz1, hsz2, hData, dwData1, dwData2);
// Run each transaction filter.
foreach (IDdemlTransactionFilter filter in _Filters)
{
if (filter.PreFilterTransaction(t))
{
return t.dwRet;
}
}
// Dispatch the transaction.
switch (uType)
{
case Ddeml.XTYP_ADVDATA:
{
DdemlClient client = _ClientTable[hConv] as DdemlClient;
if (client != null)
{
if (client.ProcessCallback(t))
{
return t.dwRet;
}
}
break;
}
case Ddeml.XTYP_ADVREQ:
{
DdemlServer server = _ServerTable1[hConv] as DdemlServer;
if (server != null)
{
if (server.ProcessCallback(t))
{
return t.dwRet;
}
}
break;
}
case Ddeml.XTYP_ADVSTART:
{
DdemlServer server = _ServerTable1[hConv] as DdemlServer;
if (server != null)
{
if (server.ProcessCallback(t))
{
return t.dwRet;
}
}
break;
}
case Ddeml.XTYP_ADVSTOP:
{
DdemlServer server = _ServerTable1[hConv] as DdemlServer;
if (server != null)
{
if (server.ProcessCallback(t))
{
return t.dwRet;
}
}
break;
}
case Ddeml.XTYP_CONNECT:
{
// Get the service name from the hsz2 string handle.
StringBuilder psz = new StringBuilder(Ddeml.MAX_STRING_SIZE);
int length = Ddeml.DdeQueryString(_InstanceId, hsz2, psz, psz.Capacity, Ddeml.CP_WINANSI);
string service = psz.ToString();
DdemlServer server = _ServerTable2[service] as DdemlServer;
if (server != null)
{
if (server.ProcessCallback(t))
{
return t.dwRet;
}
}
break;
}
case Ddeml.XTYP_CONNECT_CONFIRM:
{
// Get the service name from the hsz2 string handle.
StringBuilder psz = new StringBuilder(Ddeml.MAX_STRING_SIZE);
int length = Ddeml.DdeQueryString(_InstanceId, hsz2, psz, psz.Capacity, Ddeml.CP_WINANSI);
string service = psz.ToString();
DdemlServer server = _ServerTable2[service] as DdemlServer;
if (server != null)
{
_ServerTable1[hConv] = server;
if (server.ProcessCallback(t))
{
return t.dwRet;
}
}
break;
}
case Ddeml.XTYP_DISCONNECT:
{
DdemlClient client = _ClientTable[hConv] as DdemlClient;
if (client != null)
{
_ClientTable[hConv] = null;
if (client.ProcessCallback(t))
{
return t.dwRet;
}
}
DdemlServer server = _ServerTable1[hConv] as DdemlServer;
if (server != null)
{
_ServerTable1[hConv] = null;
if (server.ProcessCallback(t))
{
return t.dwRet;
}
}
break;
}
case Ddeml.XTYP_EXECUTE:
{
DdemlServer server = _ServerTable1[hConv] as DdemlServer;
if (server != null)
{
if (server.ProcessCallback(t))
{
return t.dwRet;
}
}
break;
}
case Ddeml.XTYP_POKE:
{
DdemlServer server = _ServerTable1[hConv] as DdemlServer;
if (server != null)
{
if (server.ProcessCallback(t))
{
return t.dwRet;
}
}
break;
}
case Ddeml.XTYP_REQUEST:
{
DdemlServer server = _ServerTable1[hConv] as DdemlServer;
if (server != null)
{
if (server.ProcessCallback(t))
{
return t.dwRet;
}
}
break;
}
case Ddeml.XTYP_XACT_COMPLETE:
{
DdemlClient client = _ClientTable[hConv] as DdemlClient;
if (client != null)
{
if (client.ProcessCallback(t))
{
return t.dwRet;
}
}
break;
}
case Ddeml.XTYP_WILDCONNECT:
{
// This library does not support wild connects.
return IntPtr.Zero;
}
case Ddeml.XTYP_MONITOR:
{
// Monitors are handled separately in DdemlMonitor.
return IntPtr.Zero;
}
case Ddeml.XTYP_ERROR:
{
// Get the error code, but do nothing with it at this time.
int error = dwData1.ToInt32();
return IntPtr.Zero;
}
case Ddeml.XTYP_REGISTER:
{
if (Register != null)
{
// Get the service name from the hsz1 string handle.
StringBuilder psz = new StringBuilder(Ddeml.MAX_STRING_SIZE);
int length = Ddeml.DdeQueryString(_InstanceId, hsz1, psz, psz.Capacity, Ddeml.CP_WINANSI);
string service = psz.ToString();
Register(this, new DdemlRegistrationEventArgs(service));
}
return IntPtr.Zero;
}
case Ddeml.XTYP_UNREGISTER:
{
if (Unregister != null)
{
// Get the service name from the hsz1 string handle.
StringBuilder psz = new StringBuilder(Ddeml.MAX_STRING_SIZE);
int length = Ddeml.DdeQueryString(_InstanceId, hsz1, psz, psz.Capacity, Ddeml.CP_WINANSI);
string service = psz.ToString();
Unregister(this, new DdemlRegistrationEventArgs(service));
}
return IntPtr.Zero;
}
}
return IntPtr.Zero;
}
internal bool ProcessCallback(DdemlTransaction transaction)
{
// This is here to alias the transaction object with a shorter variable name.
DdemlTransaction t = transaction;
switch (t.uType)
{
case Ddeml.XTYP_ADVDATA:
{
// Get the item name from the hsz2 string handle.
StringBuilder psz = new StringBuilder(Ddeml.MAX_STRING_SIZE);
int length = Ddeml.DdeQueryString(_InstanceId, t.hsz2, psz, psz.Capacity, Ddeml.CP_WINANSI);
string item = psz.ToString();
// Delegate processing to the advise loop object.
if (_AdviseLoopTable.ContainsKey(item))
{
t.dwRet = _AdviseLoopTable[item].Process(t.uType, t.uFmt, t.hConv, t.hsz1, t.hsz2, t.hData, t.dwData1, t.dwData2);
return true;
}
// This transaction could not be processed here.
return false;
}
case Ddeml.XTYP_XACT_COMPLETE:
{
// Get the transaction identifier from dwData1.
int transactionId = t.dwData1.ToInt32();
// Get the IAsyncResult from the asynchronous transaction table and delegate processing to it.
if (_AsynchronousTransactionTable.ContainsKey(transactionId))
{
AsyncResultBase arb = _AsynchronousTransactionTable[transactionId];
// Remove the IAsyncResult from the asynchronous transaction table.
_AsynchronousTransactionTable.Remove(arb.TransactionId);
t.dwRet = arb.Process(t.uType, t.uFmt, t.hConv, t.hsz1, t.hsz2, t.hData, t.dwData1, t.dwData2);
return true;
}
// This transaction could not be processed here.
return false;
}
case Ddeml.XTYP_DISCONNECT:
{
// Assign each active asynchronous transaction an exception so that the EndXXX methods do not deadlock.
foreach (AsyncResultBase arb in _AsynchronousTransactionTable.Values)
{
arb.Process(new DdemlException(Resources.NotConnectedMessage));
}
// Make sure the asynchronous transaction and advise loop tables are empty.
_AsynchronousTransactionTable.Clear();
_AdviseLoopTable.Clear();
// Unregister this client from the context so that it will not receive DDEML callbacks.
_Context.UnregisterClient(this);
// Indicate that this object is no longer connected or paused.
_Paused = false;
_ConversationHandle = IntPtr.Zero;
_InstanceId = 0;
// Raise the StateChange event.
if (StateChange != null)
{
StateChange(this, EventArgs.Empty);
}
// Raise the Disconnected event.
if (Disconnected != null)
{
Disconnected(this, new DdemlDisconnectedEventArgs(true, false));
}
// Return zero to indicate that there are no problems.
t.dwRet = IntPtr.Zero;
return true;
}
}
// This transaction could not be processed here.
return false;
}
private IntPtr ODdeNetCallback(int uType, int uFmt, IntPtr hConv, IntPtr hsz1, IntPtr hsz2, IntPtr hData, IntPtr dwData1, IntPtr dwData2)
{
// Create a new transaction object that will be dispatched to a DdemlClient, DdemlServer, or ITransactionFilter.
DdemlTransaction t = new DdemlTransaction(uType, uFmt, hConv, hsz1, hsz2, hData, dwData1, dwData2);
// Run each transaction filter.
foreach (IDdemlTransactionFilter filter in _Filters)
{
if (filter.PreFilterTransaction(t))
{
return t.dwRet;
}
}
// Dispatch the transaction.
switch (uType)
{
case Ddeml.XTYP_ADVDATA:
{
DdemlClient client = _ClientTable[hConv] as DdemlClient;
if (client != null)
{
if (client.ProcessCallback(t))
{
return t.dwRet;
}
}
break;
}
case Ddeml.XTYP_ADVREQ:
{
DdemlServer server = _ServerTable1[hConv] as DdemlServer;
if (server != null)
{
if (server.ProcessCallback(t))
{
return t.dwRet;
}
}
break;
}
case Ddeml.XTYP_ADVSTART:
{
DdemlServer server = _ServerTable1[hConv] as DdemlServer;
if (server != null)
{
if (server.ProcessCallback(t))
{
return t.dwRet;
}
}
break;
}
case Ddeml.XTYP_ADVSTOP:
{
DdemlServer server = _ServerTable1[hConv] as DdemlServer;
if (server != null)
{
if (server.ProcessCallback(t))
{
return t.dwRet;
}
}
break;
}
case Ddeml.XTYP_CONNECT:
{
// Get the service name from the hsz2 string handle.
StringBuilder psz = new StringBuilder(Ddeml.MAX_STRING_SIZE);
int length = Ddeml.DdeQueryString(_InstanceId, hsz2, psz, psz.Capacity, Ddeml.CP_WINANSI);
string service = psz.ToString();
DdemlServer server = _ServerTable2[service] as DdemlServer;
if (server != null)
{
if (server.ProcessCallback(t))
{
return t.dwRet;
}
}
break;
}
case Ddeml.XTYP_CONNECT_CONFIRM:
{
// Get the service name from the hsz2 string handle.
StringBuilder psz = new StringBuilder(Ddeml.MAX_STRING_SIZE);
int length = Ddeml.DdeQueryString(_InstanceId, hsz2, psz, psz.Capacity, Ddeml.CP_WINANSI);
string service = psz.ToString();
DdemlServer server = _ServerTable2[service] as DdemlServer;
if (server != null)
{
_ServerTable1[hConv] = server;
if (server.ProcessCallback(t))
{
return t.dwRet;
}
}
break;
}
case Ddeml.XTYP_DISCONNECT:
{
DdemlClient client = _ClientTable[hConv] as DdemlClient;
if (client != null)
{
_ClientTable[hConv] = null;
if (client.ProcessCallback(t))
{
return t.dwRet;
}
}
DdemlServer server = _ServerTable1[hConv] as DdemlServer;
if (server != null)
{
_ServerTable1[hConv] = null;
if (server.ProcessCallback(t))
{
return t.dwRet;
}
}
break;
}
case Ddeml.XTYP_EXECUTE:
{
DdemlServer server = _ServerTable1[hConv] as DdemlServer;
if (server != null)
{
if (server.ProcessCallback(t))
{
return t.dwRet;
}
}
break;
}
case Ddeml.XTYP_POKE:
{
DdemlServer server = _ServerTable1[hConv] as DdemlServer;
if (server != null)
{
if (server.ProcessCallback(t))
{
return t.dwRet;
}
}
break;
}
case Ddeml.XTYP_REQUEST:
{
DdemlServer server = _ServerTable1[hConv] as DdemlServer;
if (server != null)
{
if (server.ProcessCallback(t))
{
return t.dwRet;
}
}
break;
}
case Ddeml.XTYP_XACT_COMPLETE:
{
DdemlClient client = _ClientTable[hConv] as DdemlClient;
if (client != null)
{
if (client.ProcessCallback(t))
{
return t.dwRet;
}
}
break;
}
case Ddeml.XTYP_WILDCONNECT:
{
// This library does not support wild connects.
return IntPtr.Zero;
}
case Ddeml.XTYP_MONITOR:
{
// Monitors are handled separately in DdemlMonitor.
return IntPtr.Zero;
}
case Ddeml.XTYP_ERROR:
{
// Get the error code, but do nothing with it at this time.
int error = dwData1.ToInt32();
return IntPtr.Zero;
}
case Ddeml.XTYP_REGISTER:
{
if (Register != null)
{
// Get the service name from the hsz1 string handle.
StringBuilder psz = new StringBuilder(Ddeml.MAX_STRING_SIZE);
int length = Ddeml.DdeQueryString(_InstanceId, hsz1, psz, psz.Capacity, Ddeml.CP_WINANSI);
string service = psz.ToString();
Register(this, new DdemlRegistrationEventArgs(service));
}
return IntPtr.Zero;
}
case Ddeml.XTYP_UNREGISTER:
{
if (Unregister != null)
{
// Get the service name from the hsz1 string handle.
StringBuilder psz = new StringBuilder(Ddeml.MAX_STRING_SIZE);
int length = Ddeml.DdeQueryString(_InstanceId, hsz1, psz, psz.Capacity, Ddeml.CP_WINANSI);
string service = psz.ToString();
Unregister(this, new DdemlRegistrationEventArgs(service));
}
return IntPtr.Zero;
}
}
return IntPtr.Zero;
}
internal DdeTransaction(DdemlTransaction transaction)
{
_DdemlObject = transaction;
}
public bool PreFilterTransaction(DdemlTransaction t)
{
return _OuterFilter.PreFilterTransaction(new DdeTransaction(t));
}
internal bool ProcessCallback(DdemlTransaction transaction)
{
// This is here to alias the transaction object with a shorter variable name.
DdemlTransaction t = transaction;
switch (t.uType)
{
case Ddeml.XTYP_ADVREQ:
{
StringBuilder psz;
int length;
// Get the topic name from the hsz1 string handle.
psz = new StringBuilder(Ddeml.MAX_STRING_SIZE);
length = Ddeml.DdeQueryString(_InstanceId, t.hsz1, psz, psz.Capacity, Ddeml.CP_WINANSI);
string topic = psz.ToString();
// Get the item name from the hsz2 string handle.
psz = new StringBuilder(Ddeml.MAX_STRING_SIZE);
length = Ddeml.DdeQueryString(_InstanceId, t.hsz2, psz, psz.Capacity, Ddeml.CP_WINANSI);
string item = psz.ToString();
// Create the advise request cache key.
string key = topic + "!" + item + ":" + t.uFmt.ToString();
// Get the data being advised if the cache does not contain it already.
if (!_AdviseRequestCache.ContainsKey(key))
{
// Get the data from the subclass.
byte[] data = OnAdvise(topic, item, t.uFmt);
// Add the data to the cache because it will be needed later.
_AdviseRequestCache.Add(key, data);
}
// Get the data from the advise request cache.
byte[] cached = _AdviseRequestCache[key];
// Get the number of remaining transactions of this type for the same topic name, item name, and format tuple.
int remaining = t.dwData1.ToInt32();
// If this is the last transaction then free the data handle.
if (remaining == 0)
{
// TODO: Does the data handle really need to be freed here?
// Remove the data from the cache because it is no longer needed.
_AdviseRequestCache.Remove(key);
}
// Create and return the data handle representing the data being advised.
if (cached != null && cached.Length > 0)
{
t.dwRet = Ddeml.DdeCreateDataHandle(_InstanceId, cached, cached.Length, 0, t.hsz2, t.uFmt, 0);
return true;
}
// This transaction could not be processed here.
return false;
}
case Ddeml.XTYP_ADVSTART:
{
// Get the item name from the hsz2 string handle.
StringBuilder psz = new StringBuilder(Ddeml.MAX_STRING_SIZE);
int length = Ddeml.DdeQueryString(_InstanceId, t.hsz2, psz, psz.Capacity, Ddeml.CP_WINANSI);
string item = psz.ToString();
// Get the Conversation from the conversation table.
DdemlConversation conversation = _ConversationTable[t.hConv];
// Get a value indicating whether an advise loop should be initiated from the subclass.
t.dwRet = OnStartAdvise(conversation, item, t.uFmt) ? new IntPtr(1) : IntPtr.Zero;
return true;
}
case Ddeml.XTYP_ADVSTOP:
{
// Get the item name from the hsz2 string handle.
StringBuilder psz = new StringBuilder(Ddeml.MAX_STRING_SIZE);
int length = Ddeml.DdeQueryString(_InstanceId, t.hsz2, psz, psz.Capacity, Ddeml.CP_WINANSI);
string item = psz.ToString();
// Get the Conversation from the conversation table.
DdemlConversation conversation = _ConversationTable[t.hConv];
// Inform the subclass that the advise loop has been terminated.
OnStopAdvise(conversation, item);
// Return zero to indicate that there are no problems.
t.dwRet = IntPtr.Zero;
return true;
}
case Ddeml.XTYP_CONNECT:
{
// Get the topic name from the hsz1 string handle.
StringBuilder psz = new StringBuilder(Ddeml.MAX_STRING_SIZE);
int length = Ddeml.DdeQueryString(_InstanceId, t.hsz1, psz, psz.Capacity, Ddeml.CP_WINANSI);
string topic = psz.ToString();
// Get a value from the subclass indicating whether the connection should be allowed.
t.dwRet = OnBeforeConnect(topic) ? new IntPtr(1) : IntPtr.Zero;
return true;
}
case Ddeml.XTYP_CONNECT_CONFIRM:
{
// Get the topic name from the hsz1 string handle.
StringBuilder psz = new StringBuilder(Ddeml.MAX_STRING_SIZE);
int length = Ddeml.DdeQueryString(_InstanceId, t.hsz1, psz, psz.Capacity, Ddeml.CP_WINANSI);
string topic = psz.ToString();
// Create a Conversation object and add it to the conversation table.
_ConversationTable.Add(t.hConv, new DdemlConversation(t.hConv, _Service, topic));
// Inform the subclass that a conversation has been established.
OnAfterConnect(_ConversationTable[t.hConv]);
// Return zero to indicate that there are no problems.
t.dwRet = IntPtr.Zero;
return true;
}
case Ddeml.XTYP_DISCONNECT:
{
// Get the Conversation from the conversation table.
DdemlConversation conversation = _ConversationTable[t.hConv];
// Remove the Conversation from the conversation table.
_ConversationTable.Remove(t.hConv);
// Inform the subclass that the conversation has been disconnected.
OnDisconnect(conversation);
// Return zero to indicate that there are no problems.
t.dwRet = IntPtr.Zero;
return true;
}
case Ddeml.XTYP_EXECUTE:
{
// Get the command from the data handle.
int length = Ddeml.DdeGetData(t.hData, null, 0, 0);
byte[] data = new byte[length];
length = Ddeml.DdeGetData(t.hData, data, data.Length, 0);
string command = _Context.Encoding.GetString(data, 0, data.Length);
if (command[command.Length - 1] == '\0')
{
command = command.Substring(0, command.Length - 1);
}
// Get the Conversation from the conversation table.
DdemlConversation conversation = _ConversationTable[t.hConv];
// Send the command to the subclass and get the result.
ExecuteResult result = OnExecute(conversation, command);
// Return DDE_FACK if the subclass processed the command successfully.
if (result == ExecuteResult.Processed)
{
t.dwRet = new IntPtr(Ddeml.DDE_FACK);
return true;
}
// Return CBR_BLOCK if the subclass needs time to process the command.
if (result == ExecuteResult.PauseConversation)
{
// Increment the conversation's waiting count.
conversation.IncrementWaiting();
t.dwRet = new IntPtr(Ddeml.CBR_BLOCK);
return true;
}
// Return DDE_FBUSY if the subclass is too busy.
if (result == ExecuteResult.TooBusy)
{
t.dwRet = new IntPtr(Ddeml.DDE_FBUSY);
return true;
}
// Return DDE_FNOTPROCESSED if the subclass did not process the command.
t.dwRet = new IntPtr(Ddeml.DDE_FNOTPROCESSED);
return true;
}
case Ddeml.XTYP_POKE:
{
// Get the item name from the hsz2 string handle.
StringBuilder psz = new StringBuilder(Ddeml.MAX_STRING_SIZE);
int length = Ddeml.DdeQueryString(_InstanceId, t.hsz2, psz, psz.Capacity, Ddeml.CP_WINANSI);
string item = psz.ToString();
// Get the data from the data handle.
length = Ddeml.DdeGetData(t.hData, null, 0, 0);
byte[] data = new byte[length];
length = Ddeml.DdeGetData(t.hData, data, data.Length, 0);
// Get the Conversation from the conversation table.
DdemlConversation conversation = _ConversationTable[t.hConv];
// Send the data to the subclass and get the result.
PokeResult result = OnPoke(conversation, item, data, t.uFmt);
// Return DDE_FACK if the subclass processed the data successfully.
if (result == PokeResult.Processed)
{
t.dwRet = new IntPtr(Ddeml.DDE_FACK);
return true;
}
// Return CBR_BLOCK if the subclass needs time to process the data.
if (result == PokeResult.PauseConversation)
{
// Increment the conversation's waiting count.
conversation.IncrementWaiting();
t.dwRet = new IntPtr(Ddeml.CBR_BLOCK);
return true;
}
// Return DDE_FBUSY if the subclass is too busy.
if (result == PokeResult.TooBusy)
{
t.dwRet = new IntPtr(Ddeml.DDE_FBUSY);
return true;
}
// Return DDE_FNOTPROCESSED if the subclass did not process the data.
t.dwRet = new IntPtr(Ddeml.DDE_FNOTPROCESSED);
return true;
}
case Ddeml.XTYP_REQUEST:
{
// Get the item name from the hsz2 string handle.
StringBuilder psz = new StringBuilder(Ddeml.MAX_STRING_SIZE);
int length = Ddeml.DdeQueryString(_InstanceId, t.hsz2, psz, psz.Capacity, Ddeml.CP_WINANSI);
string item = psz.ToString();
// Get the Conversation from the conversation table.
DdemlConversation conversation = _ConversationTable[t.hConv];
// Send the request to the subclass and get the result.
RequestResult result = OnRequest(conversation, item, t.uFmt);
// Return a data handle if the subclass processed the request successfully.
if (result == RequestResult.Processed)
{
// Create and return the data handle for the data being requested.
if (result.Data != null)
{
t.dwRet = Ddeml.DdeCreateDataHandle(_InstanceId, result.Data, result.Data.Length, 0, t.hsz2, t.uFmt, 0);
}
return true;
}
// Return CBR_BLOCK if the subclass needs time to process the request.
if (result == RequestResult.PauseConversation)
{
conversation.IncrementWaiting();
t.dwRet = new IntPtr(Ddeml.CBR_BLOCK);
return true;
}
// Return DDE_FNOTPROCESSED if the subclass did not process the command.
t.dwRet = new IntPtr(Ddeml.DDE_FNOTPROCESSED);
return true;
}
}
// This transaction could not be processed here.
return false;
}