Oculus VR, Inc.

Tutorial code sample 2
Connecting, reading, and parsing network messages.

The target of this exercise was to add the following features to sample 1:
  1. Create a main loop for the program.
  2. Call Receive and store the pointer returned in a pointer variable of type Packet. Note that we continually call Receive() until no further packets are returned. A common mistake is to only call it once.
  3. Include the header file to use struct Packet
  4. If a packet arrived, check the first byte of Packet::data, and process accordingly. The list of enumerations is in MessageIdentifiers.h.
  5. Print out the comment that goes along with the enumeration.
  6. Deallocate the packet pointer when done with it.
New code over sample 1 is in bold. 




#include <stdio.h>
#include <string.h>
#include "RakPeerInterface.h"
#include "MessageIdentifiers.h"

#define MAX_CLIENTS 10
#define SERVER_PORT 60000

int main(void)
{
	char str[512];

	RakNet::RakPeerInterface *peer = RakNet::RakPeerInterface::GetInstance();
	bool isServer;
	RakNet::Packet *packet;
	
	printf("(C) or (S)erver?\n");
	gets(str);

	if ((str[0]=='c')||(str[0]=='C'))
	{
		RakNet::SocketDescriptor sd;
		peer->Startup(1,&sd, 1);
		isServer = false;
	} else {
		RakNet::SocketDescriptor sd(SERVER_PORT,0);
		peer->Startup(MAX_CLIENTS, &sd, 1);
		isServer = true;
	}

	
	if (isServer)
	{
		printf("Starting the server.\n");
		// We need to let the server accept incoming connections from the clients
		peer->SetMaximumIncomingConnections(MAX_CLIENTS);
	} else {
		printf("Enter server IP or hit enter for 127.0.0.1\n");
		gets(str);
		if (str[0]==0){
			strcpy(str, "127.0.0.1");
		}
		printf("Starting the client.\n");
		peer->Connect(str, SERVER_PORT, 0,0);

	}

	while (1)
	{
		for (packet=peer->Receive(); packet; peer->DeallocatePacket(packet), packet=peer->Receive())
		{
			switch (packet->data[0])
				{
				case ID_REMOTE_DISCONNECTION_NOTIFICATION:
					printf("Another client has disconnected.\n");
					break;
				case ID_REMOTE_CONNECTION_LOST:
					printf("Another client has lost the connection.\n");
					break;
				case ID_REMOTE_NEW_INCOMING_CONNECTION:
					printf("Another client has connected.\n");
					break;
				case ID_CONNECTION_REQUEST_ACCEPTED:
					printf("Our connection request has been accepted.\n");
					break;					
				case ID_NEW_INCOMING_CONNECTION:
					printf("A connection is incoming.\n");
					break;
				case ID_NO_FREE_INCOMING_CONNECTIONS:
					printf("The server is full.\n");
					break;
				case ID_DISCONNECTION_NOTIFICATION:
					if (isServer){
						printf("A client has disconnected.\n");
					} else {
						printf("We have been disconnected.\n");
					}
					break;
				case ID_CONNECTION_LOST:
					if (isServer){
						printf("A client lost the connection.\n");
					} else {
						printf("Connection lost.\n");
					}
					break;
				default:
					printf("Message with identifier %i has arrived.\n", packet->data[0]);
					break;
				}
		}
	}
	
	
	RakNet::RakPeerInterface::DestroyInstance(peer);

	return 0;
}