- Details
- Written by: Stanko Milosev
- Category: node.js
- Hits: 4693
One example of receiving messages for node.js. I was using nodejs-websocket module as WebSocket server.Â
My server looks like this:
var ws = require("nodejs-websocket")
var server = ws.createServer(function (conn) {
console.log("New connection")
conn.on("close", function (code, reason) {
console.log("Connection closed")
})
}).listen(8081)
setInterval(function () {
console.log("Sending 'Test'");
try {
server.connections.forEach(function (con) {
console.log("Sending 'Test'");
con.sendText("Test");
});
} catch (e) {
console.log('Error!');
console.log(e);
}
}, 1000);
Client looks like this:
window.onload = function () {
function MyConnectionWrapper() {
var self = this,
createSocket = function () { return new WebSocket('ws://127.0.0.1:8081') },
ws = createSocket();
self.onopen = function (myFunc) {
ws.onopen = myFunc;
}
self.onmessage = function (myFunc) {
console.log('In self: ' + myFunc);
ws.onmessage = myFunc;
};
}
myConn = new MyConnectionWrapper();
myConn.onmessage(function (myFunc) {
console.log('In myConn: ' + myFunc);
});
}
Here notice lines:
myConn = new MyConnectionWrapper();
myConn.onmessage(function (myFunc) {
 console.log('In myConn: ' + myFunc);
});
With first line:
myConn = new MyConnectionWrapper();
we have created socket, because automatically following code is executed:
createSocket = function () { return new WebSocket('ws://127.0.0.1:8081') },
with that myConn became WebSocket, and with self we assigned onmessage method to myConn:
self.onmessage = function (myFunc) {
 console.log('In self: ' + myFunc);
 ws.onmessage = myFunc;
};
In this case myFunc will be function which we assigned like this:
myConn.onmessage(function (myFunc) {
 console.log('In myConn: ' + myFunc);
});
Example download from here.
- Details
- Written by: Stanko Milosev
- Category: node.js
- Hits: 4788
From Node.js v0.10.31 Manual & Documentation I copied example, like:
var http = require('http');
http.createServer(function (request, response) {
response.writeHead(200, {'Content-Type': 'text/plain'});
response.end('Hello World\n');
}).listen(8124);
console.log('Server running at http://127.0.0.1:8124/');
If you save example like "example.js" and after starting server in command prompt with:
node example.js
in your browser go to the address:
http://localhost:8124/
and you should see "Hello World"
- Details
- Written by: Stanko Milosev
- Category: Software Development Philosophy
- Hits: 7879
I created new section and category, software development philosophy, I get an idea to name it like this from wikipedia's article, List of software development philosophies
Since in that list there is no refinement, I would like to mention it.
According to wikipedia, program refinement is the verifiable transformation of an abstract (high-level) formal specification into a concrete (low-level) executable program.
So, what that exactly mean?
In Delphi it look something like this:
procedure SortFile (filename:string);
begin
// Read file into memory
// Sort the lines
// Write file out of memory
end;
Later you develop your code.
I started to use this approach few months ago, and it is very usefull, when I start coding like this, usually my code look much better.
I took the code, and idea of writing all this from here.