Sockets. Send new coordinates to each client

[Daslee]

Hello. Im trying to make online game with sockets, but now i have really big problem. Now for example i have chat application, but how i can send functions instead of message? Let's say 1 client moves to new coordinates and then how 2 client must get 1 client new coordinates? Maybe somehow when 1 client moves send new coordinates to server and server sends new coordinates to all other clients?

[Norm]

how i can send functions instead of message?

What do you mean by a "function"?

when 1 client moves send new coordinates to server and server sends new coordinates to all other clients

That sounds like a reasonable approach.

[Daslee]

What do you mean by a "function"?


That sounds like a reasonable approach.

Function, something like that: public void updateCoordinates(int newX, newY){ }
Im thinking about something like that: Server have this function: public void updateCoordinates(int newX, newY){ } And when clients moves to new coordinates, he sends this message: "updateCoordinates(newX, newY)", But thats the problem, because server do not read it as function using, but reads as message.

[Norm]

public void updateCoordinates(int newX, newY){ }

That looks like a method.

There should be a protocol that is used to tell the other side what to do. The message would say: do an update on the coordiates to this new position(x, y). When the server gets the message, it would call its updateCoordinates() method with the x,y values passed in the message.

[Daslee]

That looks like a method.

There should be a protocol that is used to tell the other side what to do. The message would say: do an update on the coordiates to this new position(x, y). When the server gets the message, it would call its updateCoordinates() method with the x,y values passed in the message.

That's what i need, but how i can send from client to server message which contains:

do an update on the coordiates to this new position(x, y)

Lets say i send this: Update X:13 Y:20 And how i must read x and y? I can check if he wants to do update with: if startsWith Update... Maybe using split "x:" and "y:"?

[Norm]

Splitting the message up into its parts is called parsing. When the code receives an Update message the parser would strip out the x and y values and call the method with them. To get the parts of the message you could use some of the String class methods: indexOf and substring for example.
Or you could change the protocol to: Update:13:20 and split on the :

[Daslee]

Splitting the message up into its parts is called parsing. When the code receives an Update message the parser would strip out the x and y values and call the method with them. To get the parts of the message you could use some of the String class methods: indexOf and substring for example.
Or you could change the protocol to: Update:13:20 and split on the :

Thank you so much. Finally i find out how to do that.

String whatToSplit;
		whatToSplit = "UPDATE:13:20"; //Lets say client sended this new coordinates x:13 and y:20
		
		String[] whatToDo;
		String xCoord, yCoord;
		
		whatToDo = whatToSplit.split(":", 0); //Split what we want to do (For now: UPDATE)
		
		xCoord = whatToDo[1]; //Split x coordinates
		yCoord = whatToDo[2]; //Split y coordinates

		if(whatToDo[0].contains("UPDATE")){
			System.out.println(whatToDo[0] + " - We want to update");
			System.out.println("And update with this coordinates x: " + xCoord + " y: " + yCoord);
		}

[Norm]

And do more of the same for the other message types.

[Daslee]

And do more of the same for the other message types.

Yes i know. :P