public void TryConnect(string service, string topic, IDDEConversationListener listener)
{
var op = this.dispatcher.BeginInvoke(new Action(delegate()
{
if (idInst == 0)
{
listener.OnConnect(null);
}
using (var hszService = new DdeStringHandle(idInst, service))
using (var hszTopic = new DdeStringHandle(idInst, topic))
{
var hConv = DDEML.DdeConnect(idInst, hszService.Handle, hszTopic.Handle, IntPtr.Zero);
if (hConv == IntPtr.Zero)
{
var errno = DDEML.DdeGetLastError(idInst);
var error = DDEML.GetErrorString(errno) + " (" + errno.ToString() + ")";
Log.Emit("dde-connect-failed", "service", service, "topic", topic, "error", error);
listener.OnConnect(null);
}
else
{
Log.Emit("dde-connect", "service", service, "topic", topic, "hConv", hConv);
var conv = new Conversation(this, service, topic, hConv, listener);
this.conversations.Add(hConv, conv);
listener.OnConnect(conv);
}
}
}));
}
void ThreadMain(object readyEvent)
{
var ddeCallback = new DDEML.DdeCallback(this.DdeCallback);
try
{
dispatcher = Dispatcher.CurrentDispatcher;
int res = DDEML.DdeInitialize(ref idInst, ddeCallback, DDEML.APPCMD_CLIENTONLY, 0);
if (res != DDEML.DMLERR_NO_ERROR)
{
var err_no = DDEML.DdeGetLastError(idInst);
string error = DDEML.GetErrorString(err_no) + " (" + err_no.ToString() + ")";
Log.Emit("dde-init-err", "error", error);
InitializationMessage = error;
idInst = 0;
}
else
{
Log.Emit("dde-init-ok", "id", idInst);
InitializationMessage = "OK";
}
(readyEvent as AutoResetEvent).Set();
Dispatcher.Run();
}
catch (Exception e)
{
Log.Emit("dde-thread-exception", "exception", e);
foreach (var kv in conversations)
{
try
{
kv.Value.Disconnect();
}
catch (Exception e2)
{
Log.Emit("dde-thread-exception", "exception", e2);
}
}
}
GC.KeepAlive(ddeCallback);
}
void Transact(string itemName, int wFmt, int wType, DDETransactionCallback callback)
{
Client.dispatcher.BeginInvoke(new Action(delegate()
{
if (Handle == IntPtr.Zero)
{
return;
}
int res = 0;
using (var hsz = new DdeStringHandle(Client.idInst, itemName))
{
using (var hData = new DdeDataHandle(DDEML.DdeClientTransaction(null, 0, Handle, hsz.Handle, wFmt, wType, DDEML.TIMEOUT_ASYNC, ref res)))
{
Log.Emit("dde-transact", "hConv", this.Handle, "item", itemName, "wFmt", wFmt, "wType", DDEML.GetTypeString(wType), "callback", callback != null, "id", res);
if (hData.Handle == IntPtr.Zero)
{
var errno = DDEML.DdeGetLastError(Client.idInst);
Log.Emit("dde-transact-failed", "error", DDEML.GetErrorString(errno) + " (" + errno.ToString() + ")");
if (callback != null)
{
callback(itemName, false, null);
}
this.Disconnect();
}
else
{
if (callback != null)
{
if (res == 0)
{
callback(itemName, false, null);
}
else if (callback != null & res != 0)
{
var id = new IntPtr(res);
transactions.Add(id, new Transaction(id, callback));
}
}
}
}
}
}));
}