public static void Main(string[] args)
{
// Wait for the user to press ENTER before proceding.
Console.WriteLine("The Server sample must be running before the client can connect.");
Console.WriteLine("Press ENTER to continue...");
Console.ReadLine();
try
{
// Create a client that connects to 'myapp|mytopic'.
using (DdeClient client = new DdeClient("myapp", "mytopic"))
{
// Subscribe to the Disconnected event. This event will notify the application when a conversation has been terminated.
client.Disconnected += OnDisconnected;
// Connect to the server. It must be running or an exception will be thrown.
client.Connect();
// Synchronous Execute Operation
client.Execute("mycommand", 60000);
// Synchronous Poke Operation
client.Poke("myitem", DateTime.Now.ToString(), 60000);
// Syncronous Request Operation
Console.WriteLine("Request: " + client.Request("myitem", 60000));
// Asynchronous Execute Operation
client.BeginExecute("mycommand", OnExecuteComplete, client);
// Asynchronous Poke Operation
client.BeginPoke("myitem", Encoding.ASCII.GetBytes(DateTime.Now.ToString() + "\0"), 1, OnPokeComplete, client);
// Asynchronous Request Operation
client.BeginRequest("myitem", 1, OnRequestComplete, client);
// Advise Loop
client.StartAdvise("myitem", 1, true, 60000);
client.Advise += OnAdvise;
// Wait for the user to press ENTER before proceding.
Console.WriteLine("Press ENTER to quit...");
Console.ReadLine();
}
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
Console.WriteLine("Press ENTER to quit...");
Console.ReadLine();
}
}
public void Test_BeginRequest_Before_Connect()
{
using (TestServer server = new TestServer(ServiceName))
{
server.Register();
server.SetData(TopicName, ItemName, 1, Encoding.ASCII.GetBytes(TestData));
using (DdeClient client = new DdeClient(ServiceName, TopicName))
{
IAsyncResult ar = client.BeginRequest(ItemName, 1, null, null);
}
}
}
public void Test_EndRequest_After_Dispose()
{
using (TestServer server = new TestServer(ServiceName))
{
server.Register();
server.SetData(TopicName, ItemName, 1, Encoding.ASCII.GetBytes(TestData));
using (DdeClient client = new DdeClient(ServiceName, TopicName))
{
client.Connect();
IAsyncResult ar = client.BeginRequest(ItemName, 1, null, null);
Assert.IsTrue(ar.AsyncWaitHandle.WaitOne(Timeout, false));
client.Dispose();
byte[] data = client.EndRequest(ar);
}
}
}
public async Task<object> GetInvoker(IDictionary<string, object> input)
{
var services = (IDictionary<string, object>)input["services"];
var callbacks = (IDictionary<string, object>)input["callbacks"];
var encoding = input.ContainsKey("encoding")
? Encoding.GetEncoding((string)input["encoding"]) : null;
var decode = encoding == null
? (Func<object, string>)((s) => (string)s) : (s) => HttpUtility.UrlDecode((string)s, encoding);
var clients = new List<DdeClient>();
foreach (string service in services.Keys)
{
var topics = (IDictionary<string, object>)services[service];
foreach (string topic in topics.Keys)
{
DdeClient client = new DdeClient(decode(service), decode(topic));
clients.Add(client);
}
}
var onDisconnected = (Func<object, Task<object>>)callbacks["OnDisconnected"];
foreach (DdeClient client in clients)
{
client.Disconnected += async (object sender, DdeDisconnectedEventArgs args) =>
{
var obj = new Dictionary<string, object>();
obj["service"] = client.Service;
obj["topic"] = client.Topic;
obj["isDisposed"] = args.IsServerInitiated;
obj["isServerInitiated"] = args.IsServerInitiated;
await Task.Run(async () => await onDisconnected(obj));
};
}
var onAdvise = (Func<object, Task<object>>)callbacks["OnAdvise"];
foreach (DdeClient client in clients)
{
client.Advise += async (object sender, DdeAdviseEventArgs args) =>
{
var obj = new Dictionary<string, object>();
obj["service"] = client.Service;
obj["topic"] = client.Topic;
obj["item"] = args.Item;
obj["text"] = args.Text;
await Task.Run(async () => await onAdvise(obj));
};
}
return (Func<object, Task<object>>)(async (i) =>
{
var opts = (IDictionary<string, object>)i;
var method = (string)opts["method"];
var command = opts.ContainsKey("command") ? (string)opts["command"] : null;
var data = opts.ContainsKey("data") ? (string)opts["data"] : null;
var format = opts.ContainsKey("format") ? (int)opts["format"] : 1;
var timeout = opts.ContainsKey("timeout") ? (int)opts["timeout"] : 10000;
var hot = opts.ContainsKey("hot") ? (bool)opts["hot"] : true;
var callback = opts.ContainsKey("callback")
? (Func<object, Task<object>>)opts["callback"] : (o) => null;
var results = new List<IDictionary<string, object>>();
string item = null;
if (opts.ContainsKey("item"))
{
item = decode((string)opts["item"]);
}
if (clients.Count == 1 && item != null) // a single client and only one 'item' is supplied.
{
var client = clients.First();
((IDictionary<string, object>)services[client.Service])[client.Topic] = new[] { item };
byte[] result = null;
switch (method)
{
case "Request":
result = client.Request(item, format, timeout);
return Encoding.Default.GetString(result);
case "BeginExecute":
await Task.Run(() =>
{
var tcs = new TaskCompletionSource<bool>();
AsyncCallback cb = (ar) => { tcs.SetResult(true); };
client.BeginExecute(command, cb, client);
var r = tcs.Task.Result;
});
break;
case "BeginPoke":
await Task.Run(() =>
{
var tcs = new TaskCompletionSource<bool>();
AsyncCallback cb = (ar) => { tcs.SetResult(true); };
var bytes = Encoding.Default.GetBytes((string)opts["data"] + "\0");
client.BeginPoke(item, bytes, format, cb, client);
var r = tcs.Task.Result;
});
break;
case "BeginRequest":
await Task.Run(() =>
{
var tcs = new TaskCompletionSource<byte[]>();
AsyncCallback cb = (ar) =>
{
tcs.SetResult(client.EndRequest(ar));
};
client.BeginRequest(item, format, cb, client);
result = tcs.Task.Result;
});
return Encoding.Default.GetString(result);
case "BeginStartAdvise":
await Task.Run(() =>
{
var tcs = new TaskCompletionSource<bool>();
AsyncCallback cb = (ar) => { tcs.SetResult(true); };
client.BeginStartAdvise(item, format, hot, cb, client);
var r = tcs.Task.Result;
});
break;
case "BeginStopAdvise":
await Task.Run(() =>
{
var tcs = new TaskCompletionSource<bool>();
AsyncCallback cb = (ar) => { tcs.SetResult(true); };
client.BeginStopAdvise(item, cb, client);
var r = tcs.Task.Result;
});
break;
case "Service":
return client.Service;
case "Topic":
return client.Topic;
case "Handle":
return client.Handle;
case "IsConnected":
return client.IsConnected;
case "IsPaused":
return client.IsPaused;
}
}
if (clients.Count >= 1)
{
switch (method)
{
case "Connect":
clients.ForEach((c) => c.Connect());
break;
case "Disconnect":
clients.ForEach((c) => c.Disconnect());
break;
case "Pause":
clients.ForEach((c) => c.Pause());
break;
case "Resume":
clients.ForEach((c) => c.Resume());
break;
case "Execute":
clients.ForEach((c) => c.Execute(command, timeout));
break;
case "Poke":
foreach (DdeClient client in clients)
{
var topics = (IDictionary<string, object>)services[client.Service];
var items = (object[])topics[client.Topic];
foreach (string item_ in items)
{
client.Poke(decode(item_), data, timeout);
}
}
break;
case "Request":
foreach (DdeClient client in clients)
{
var topics = (IDictionary<string, object>)services[client.Service];
var items = ((object[])topics[client.Topic]).Select(decode);
foreach (string item_ in items)
{
var result = client.Request(item_, format, timeout);
var obj = new Dictionary<string, object>();
obj["service"] = client.Service;
obj["topic"] = client.Topic;
obj["item"] = item_;
obj["result"] = Encoding.Default.GetString(result);
results.Add(obj);
}
}
return results.ToArray();
case "StartAdvise":
foreach (DdeClient client in clients)
{
var topics = (IDictionary<string, object>)services[client.Service];
var items = ((object[])topics[client.Topic]).Select(decode);
foreach (string item_ in items)
{
client.StartAdvise(item_, format, hot, timeout);
}
}
break;
case "StopAdvise":
foreach (DdeClient client in clients)
{
var topics = (IDictionary<string, object>)services[client.Service];
var items = ((object[])topics[client.Topic]).Select(decode);;
foreach (string item_ in items)
{
client.StopAdvise(item_, timeout);
}
}
break;
case "Dispose":
clients.ForEach((c) => c.Dispose());
break;
case "Service":
return clients.Select((c) => c.Service).ToArray();
case "Topic":
return clients.Select((c) => c.Topic).Distinct().ToArray();
case "Handle":
return clients.Select((c) => c.Handle).ToArray();
case "IsConnected":
return clients.All((c) => c.IsConnected);
case "IsPaused":
return clients.All((c) => c.IsPaused);
}
}
return null;
});
}