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SFML network examples


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#1 MARS_999   Members   -  Reputation: 1264

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Posted 26 March 2012 - 09:59 PM

Hello, I am lost on what I am missing to get my networking code working, to allow the server and client to send messages back and forth to each other... Do I need to setup a separate thread for each socket? e.g. one thread server one for client?

Looking to have someone edit what I would need to do to have this loop without having any issues... Right now I have to hit enter on both ends to see the results?

#include "stdafx.h"

bool running = true;
bool logged  = false;

void SendMsgTcp(sf::TcpSocket& socket)
{
	std::string s;
	std::cout << "Enter Message: ";
	std::cin >> s;

	if(s == "exit" || s == "Exit" || s == "EXIT")
		logged = false;

	sf::Packet packet;
	packet << s;
	if(socket.send(packet) != sf::Socket::Done)
		return;
	std::cout << "Message sent to the client: \"" << s << "\"" << std::endl;
}
void RecieveMsgTcp(sf::TcpSocket& socket)
{
	std::string s;
	sf::Packet packet;
	if(socket.receive(packet) != sf::Socket::Done)
		return;
	packet >> s;
	std::cout << "Answer received from the client: \"" << s << "\"" << std::endl;
}

void runTcpServer(unsigned short port)
{
	// Create a server socket to accept new connections
	sf::TcpListener listener;

	// Listen to the given port for incoming connections
	if (listener.listen(port) != sf::Socket::Done)
		return;
	std::cout << "IP Address = " << sf::IpAddress::getPublicAddress().toString() << std::endl;
	std::cout << "Server is listening to port " << port << ", waiting for connections... " << std::endl;
	
	while(running)
	{
		sf::TcpSocket socket;
		if(listener.accept(socket) == sf::Socket::Done)
		{
			// A new client just connected!
			std::cout << "New connection received from " << socket.getRemoteAddress() << std::endl;
			logged = true;
		}
		while(logged)
		{
			SendMsgTcp(socket);
			RecieveMsgTcp(socket);
		}
	}
}
void runTcpClient(unsigned short port)
{
	// Ask for the server address
	sf::IpAddress server;
	do
	{
		std::cout << "Type the address or name of the server to connect to: ";
		std::cin  >> server;
	}
	while (server == sf::IpAddress::None);

	// Create a socket for communicating with the server
	sf::TcpSocket socket;

	// Connect to the server
	if (socket.connect(server, port) != sf::Socket::Done)
	{
		std::cout << "Cannot connect to server " << std::endl;
		return;
	}
	std::cout << "Connected to server " << server << std::endl;

	while(running)
	{
		SendMsgTcp(socket);
		RecieveMsgTcp(socket);
	}
}

int main(int argc, char* argv[])
{
	// Choose an arbitrary port for opening sockets
	const unsigned short port = 5000;

	// TCP, UDP or connected UDP ?
	char protocol;
	std::cout << "Do you want to use TCP (t) or UDP (u) ? ";
	std::cin  >> protocol;

	// Client or server ?
	char who;
	std::cout << "Do you want to be a server (s) or a client (c) ? ";
	std::cin  >> who;

	if (protocol == 't')
	{
		// Test the TCP protocol
		if (who == 's')
			runTcpServer(port);
		else
			runTcpClient(port);
	}
	else
	{
		// Test the unconnected UDP protocol
		if (who == 's')
			runUdpServer(port);
		else
			runUdpClient(port);
	}

	// Wait until the user presses 'enter' key
	std::cout << "Press enter to exit..." << std::endl;
	std::cin.ignore(10000, '\n');
	std::cin.ignore(10000, '\n');

	return EXIT_SUCCESS;
}


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#2 MARS_999   Members   -  Reputation: 1264

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Posted 07 April 2012 - 01:03 AM

So far I have this simple example running and I can't figure out why the Client() can't loop to allow the server to send it's messages and allow me to output them each loop? I have to type something first before I can see the sent message from the server... Any ideas?

#include "stdafx.h"

const unsigned short PORT = 5000;
const std::string IPADDRESS("127.0.0.0.1");

bool quit = false;
std::ofstream fout("test.txt");

template<class T>
class SharedType
{
public:
    std::vector<T> data;
    sf::Mutex mutex;

    SharedType(){}
    ~SharedType(){}
    void Push(const T& t)
    {
        mutex.lock();
        data.push_back(t);
        mutex.unlock();
    }
    T Get(void)
    {
        T t;
        mutex.lock();
        if(!data.empty())
            t = data.back();
        mutex.unlock();
        return t;
    }
    void Pull(std::vector<T>& v)
    {
        mutex.lock();
        v = data;
        data.clear();
        mutex.unlock();
    }
    void Clear(void)
    {
        mutex.lock();
        data.clear();
        mutex.unlock();
    }
};
SharedType<std::string> data;

void Server(void)
{
    std::list<sf::TcpSocket*> clients;
    sf::SocketSelector selector;
    sf::TcpListener listener;
    
    listener.listen(PORT);    
    selector.add(listener);
    
    while(!quit)
    {
        if(selector.wait(sf::seconds(2.0f)))
        {
            if(selector.isReady(listener))
            {
                sf::TcpSocket* client = new sf::TcpSocket;
                if(listener.accept(*client) == sf::Socket::Done)
                {
                    clients.push_back(client);
                    selector.add(*client);
   			 }
   		 }
            else    
            {
                //receive messages from clients
                for(std::list<sf::TcpSocket*>::iterator it = clients.begin(); it != clients.end(); ++it)
                {
                    sf::TcpSocket& client = **it;
                    if(selector.isReady(client))
                    {
                        sf::Packet packet;
                        std::string clientMsg;
   					 if(client.receive(packet) == sf::Socket::Done)
                        {    
                            packet >> clientMsg;
                            std::cout << "\nClient said: " << clientMsg << std::endl;
                            clientMsg.clear();
                        }
                    }
                }
            }
        }
        //send messages?
        for(std::list<sf::TcpSocket*>::iterator it = clients.begin(); it != clients.end(); ++it)
        {
            sf::TcpSocket& client = **it;
            if(selector.isReady(client))
            {
                sf::Packet packet;
                std::string s;
                s = data.Get();
                data.Clear();
                if(!s.empty())
                {
                    packet << s;
                    if(client.send(packet) == sf::Socket::Done)
                    {
                        std::cout << "\nMessage sent to client: " << s << std::endl;
                    }
                }
            }
        }
    }
}
void Client(void)
{
    std::string s;
    sf::Packet packet;    
    sf::TcpSocket socket;
    socket.setBlocking(false);    
    while(true)
    {
        if(quit)
            break;
        socket.connect(IPADDRESS, PORT);
        if(socket.getRemotePort())
            break;
    }
    while(!quit)
    {
        if(socket.receive(packet) == sf::Socket::Done)
        {
            packet >> s;
            std::cout << "\nThe server said: " << s << std::endl;
        }
        packet.clear();
        s.clear();
        
        s = data.Get();
        data.Clear();
        if(!s.empty())
        {
            packet << s;
            if(socket.send(packet) == sf::Socket::Done)
            {
                std::cout << "\nMessage sent to server: " << s << std::endl;
            }
        }
        packet.clear();
        s.clear();
    }
}
void GetInput(void)
{
    std::string s;
    std::cout << "\nEnter \"exit\" to quit or message to send: ";
    std::cin >> s;
    data.Push(s);
    if(s == "exit")
        quit = true;
}
int main(int argc, char* argv[])
{
    sf::Thread* thread = 0;

    char who;
    std::cout << "Do you want to be a server (s) or a client (c) ? ";
    std::cin  >> who;

    if(who == 's')
        thread = new sf::Thread(&Server);
    else
        thread = new sf::Thread(&Client);
    
    thread->launch();

    while(!quit)
    {
        GetInput();
    }
    if(thread)
    {
        thread->wait();
        delete thread;
    }

    std::vector<std::string> temp;
    data.Pull(temp);
    for(unsigned int i = 0; i < temp.size(); ++i)
        fout << temp[i] << std::endl;
    
    return 0;
}





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