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));
}
}
}
}
}
}));
}