Tutorial code sample 5

Relaying packets from the server.
The target of this exercise was cause the server to relay the chat message back to the sending client. New code over sample 4 is in bold.

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

    #define MAX_CLIENTS 10
    #define SERVER_PORT 60000

    // Moved out of main - needs global scope
    RakPeerInterface *peer;
    bool isServer;

    void PrintMessage(RPCParameters *rpcParameters)
    {
    	printf("%s\n", rpcParameters->input);

    	if (isServer){
    		peer->RPC("PrintMessage",(const char*)rpcParameters->input, rpcParameters->numberOfBitsOfData, HIGH_PRIORITY, RELIABLE_ORDERED, 0, rpcParameters->sender, false, 0, UNASSIGNED_NETWORK_ID, 0);
    	}

    }

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

    	//RakPeerInterface *peer = RakNetworkFactory::GetRakPeerInterface();
    	//bool isServer;

    	Packet *packet;

    	peer = RakNetworkFactory::GetRakPeerInterface();

    	printf("(C) or (S)erver?\n");
    	gets(str);
    	if ((str[0]=='c')||(str[0]=='C'))
    	{
    		peer->Startup(1,30,&SocketDescriptor(), 1);
    		isServer = false;
    	} else {
    		peer->Startup(MAX_CLIENTS, 30, &SocketDescriptor(SERVER_PORT,0), 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);
    	}

    	REGISTER_STATIC_RPC(peer, PrintMessage);

    	while (1)
    	{
    		packet=peer->Receive();

    		if (packet)
    		{
    			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");
    				printf("Enter a string to show on the server: ");
    				gets(str);
    				// Two tricky things here.  First, you have to remember to send the NULL terminator so you need strlen(str)+1
    				// Second, if you didn't read the docs you might not realize RPC takes the number of bits rather than the number of bytes.
    				// You have to multiply the number of bytes by 8
    				// Don't forget that RPC takes bits as the data length, not bytes!
    				peer->RPC("PrintMessage",str, (strlen(str)+1)*8, HIGH_PRIORITY, RELIABLE_ORDERED, 0, UNASSIGNED_SYSTEM_ADDRESS, true, 0, UNASSIGNED_NETWORK_ID,0);
    				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;
    			}

    			peer->DeallocatePacket(packet);
    		}
    	}

    	RakNetworkFactory::DestroyRakPeerInterface(peer);

    	return 0;
    }