|Tutorial Project setup|
In this tutorial all images and interface references are for Visual Studio 2005, copyrighted by Microsoft. Use the equivalents for your own compiler.|
|Tutorial Code implementation|
|1. Design Lets make the chat server as basic as possible to begin with. It will have two main modes: server and client. The server will receive a client message. The client will send a message on startup. We'll hardcode most of the input variables so we don't clutter the code with non-networking stuff.|
2. First compile
Create your main function. Query the user as to whether they want to run a client or server. Create the peer instance, and call Startup with the appropriate parameters for a Server or Client. Destroy the peer at the end.
Try writing it on your own first. When you are done,
Display code sample 1
Hit F7 or the equivalent to build. It should build successfully at this point. If it doesn't, refer to the FAQ which gives many reasons for why something won't build and how to fix it. If that doesn't answer your question, post a question in the forum.
3. Adding functionality
Now that we have a client and server instantiated, we need to know what it can do. The best way to find out is to go to the source: RakPeerInterface.h. It contains all the functions for the class, plus detailed comments on each function. See the comments for the Startup and Connect functions. You should also take a look at SetMaximumIncomingConnections. |
In the code, after the server was created, add code to start the server. That takes certain parameters - set whatever you wish, based on the description provided in the comments.
Do something similar with the client. After the code where it is created, add code to connect it. It takes an IP - add code to read an IP. For the server port, either put code to read the port, or hardcode the server port you entered above. For the client port, either put code to read it, or put 0 to automatically choose.
This is all you need to do to start a server or connect a client. To determine if the connection was successful, we need to be able to read messages from the network system. In RakPeerInterface.h you'll find a Receive function. This function returns a "Packet" structure, which is defined in RakNetTypes.h. It encapsulates one message and is quite simple. Go look at that now.
As you can see from the "char *data" member, all packets contain an array of bytes. These bytes can be anything you want. The length of the array is indicated by the length and bitSize fields. The convention RakNet uses is the first byte is always an identifier that tells you what the rest of the data is. These identifiers are defined in MessageIdentifiers.h. Go look at that now.
You'll see there are quite a few pre-defined enumerations. You should quickly read the comments on each of them. We only care about the connectivity enumerations for now. So your next programming step is as follows:
Display code sample 2
At this point you should be able to run two instances (In Visual Studio, hit ctrl-F5 twice) and connect to each other. If you cannot connect, then refer to the FAQ or post in the forum.
This is the output from my version of the sample:
(C)lient or (S)erver?
Starting the server.
A connection is incoming.
(C)lient or (S)erver?
Enter server IP or hit enter for 127.0.0.1
Starting the client.
Our connection request has been accepted.
We are now ready to send input.
Your next programming steps are:
When you are done,
Remote Procedure calls