node-dde-with-edge-js

node-dde-with-edge-js is a simplified regacy win32 Dynamic Data Exchange (DDE) wrapper for node.js using Edge.js and NDde. The client listen to the asynchronous advise on multi-threaded CLR without blocking the node.js event loop.

Installation

Run the following in your project folder:

npm install node-dde-with-edge-js

Example

Client

Example to listen to the asynchronous advise from a single service-topic-item source is the following:

var dde = require("node-dde-with-edge-js");
 
client = dde.createClient("myapp", "mytopic");
 
client.on("advise", function (service, topic, item, text) {
  console.log(
    "OnAdvise: " +
      "Service: " +
      service +
      ", Topic: " +
      topic +
      ", Item: " +
      item +
      ", Text: " +
      text
  );
});
 
client.connect();
 
client.startAdvise("myitem");

Example to listen to the asynchronous advise from multiple service-topic-item sources is the following:

var dde = require("node-dde-with-edge-js");
 
clients = dde.createClients({
  myapp: {
    mytopic1: ["myitem1", "myitem2"],
    mytopic2: ["myitem1", "myitem2"],
  },
});
 
clients.on("advise", function (service, topic, item, text) {
  console.log(
    "OnAdvise: " +
      "Service: " +
      service +
      ", Topic: " +
      topic +
      ", Item: " +
      item +
      ", Text: " +
      text
  );
});
 
clients.connect();
 
clients.startAdvise();

Example of sending an asynchronous advise to the browser in realtime using Socket.IO is the following:

var io = require("socket.io").listen(80);
 
var dde = require("node-dde-with-edge-js").createClient("myapp", "mytopic");
 
dde.on("advise", function (service, topic, item, text) {
  io.sockets.emit("advise", { item: item, text: text });
});
 
dde.connect();
 
dde.startAdvise("myitem");

Server

Example to push the asynchronous advise to the client is the following:

var dde = require("node-dde-with-edge-js");
 
server = dde.createServer("myapp");
 
server.on("disconnect", function (service, topic) {
  console.log("OnDisconnect: " + "Service: " + service + ", Topic: " + topic);
});
 
server.on("advise", function (topic, item, format) {
  console.log(
    "OnAdvise: " + "Topic: " + topic + ", Item: " + item + ", Format: " + format
  );
});
 
var i = 0;
server.onAdvise = function () {
  return "advise-" + i++;
};
 
setInterval(function () {
  server.advise("*", "*");
}, 1000);
 
server.register();

Methods

// Client
 
client = dde.createClient(service, topic);
client.connect();
client.disconnect();
client.pause();
client.resume();
client.execute(command, timeout);
client.poke(item, data, timeout);
client.request(item, format, timeout);
client.startAdvise(item, format, hot, timeout);
client.stopAdvise(item, timeout);
client.beginExecute(command, oncomplete);
client.beginPoke(item, data, format, oncomplete);
client.beginRequest(item, format, oncomplete);
client.beginStartAdvise(item, format, hot, oncomplete);
client.beginStopAdvise(item, oncomplete);
client.dispose();
client.service();
client.topic();
client.isConnected();
client.isPaused();
 
// Clients
 
clients = dde.createClients(services);
clients.connect();
clients.disconnect();
clients.pause();
clients.resume();
clients.execute(command, timeout);
clients.poke(data, timeout);
clients.request(format, timeout);
clients.startAdvise(format, hot, timeout);
clients.stopAdvise(timeout);
clients.dispose();
clients.service();
clients.topic();
clients.isConnected();
clients.isPaused();
 
// Server
 
server = dde.createServer(service);
server.register();
server.unregister();
server.advise(topic, item);
server.disconnect();
server.pause();
server.resume();
server.dispose();
server.service();
server.isRegistered();

Events

// Client
 
client.on("disconnected", function (
  service,
  topic,
  isDisposed,
  isServerInitiated
) {});
client.on("advise", function (service, topic, item, text) {});
 
// Clients
 
clients.on("disconnected", function (
  service,
  topic,
  isDisposed,
  isServerInitiated
) {});
clients.on("advise", function (service, topic, item, text) {});
 
// Server
 
server.on("before connect", function (topic) {});
server.on("after connect", function (service, topic) {});
server.on("disconnect", function (service, topic) {});
server.on("start advise", function (service, topic, item, format) {});
server.on("stop advise", function (service, topic, item) {});
server.on("execute", function (service, topic, command) {});
server.on("poke", function (service, topic, item, data, format) {});
server.on("request", function (service, topic, item, format) {});
server.on("advise", function (topic, item, format) {});

Overridable callbacks

// Client
 
// N/A
 
// Clients
 
// N/A
 
// Server
 
server.onBeforeConnect = function (topic) {
  return true;
};
server.onAfterConnect = function (service, topic) {};
server.onDisconnect = function (service, topic) {};
server.onStartAdvise = function (service, topic, item, format) {
  return true;
};
server.onStopAdvise = function (service, topic, item) {};
server.onExecute = function (service, topic, command) {};
server.onPoke = function (service, topic, item, data, format) {};
server.onRequest = function (service, topic, item, format) {
  return "";
};
server.onAdvise = function (topic, item, format) {
  return "";
};