Messages

1

Graphics / Re: Error running Particle System for SFML 2 from Sources Codes section

« on: December 05, 2014, 02:04:46 am »

Thanks for the reply,
the source code is a cut and paste of the example source code found in SFML website >> wiki.

2

Graphics / Error running Particle System for SFML 2 from Sources Codes section

« on: December 05, 2014, 01:18:49 am »

Hi all,
this is the error i get when i try to run the example. The only modification i made is to load different font because i havent the one in the source.

terminate called after throwing an instance of 'std::runtime_error'
  what():  random_device::random_device(const std::string&)

This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information.

Process returned 255 (0xFF)   execution time : 26.612 s
Press any key to continue.

3

Network / Re: After sending a packet (seems) receiving wrong header...

« on: November 30, 2014, 02:03:00 am »

Ok, executing the client and the server on two different computers everything works fine! So the problem is that sfml tracks keyboard events even out of focus! Thanks Gambit!

4

Network / Re: After sending a packet (seems) receiving wrong header...

« on: November 29, 2014, 09:20:16 pm »

Ok, i no more have a header and shared variables but the result is the same...

I've attached output. Top server, bottom client. The command was sended from the client but it's showed on both windows. Also, when i exit the client the server closes too! Why?

Here the code:

#include <iostream>
#include <windows.h>
#include <SFML/Network.hpp>
#include <SFML/Window.hpp>

const unsigned short PORT = 5000;
const std::string IPADDRESS("192.168.1.71");//change to suit your needs

sf::TcpSocket client_server;

bool quit = false;

std::string message_from = "";

void DoStuff(void){
    while(!quit){
        std::string msg_receive;
        sf::Packet packetReceive;

        client_server.receive(packetReceive);
        if(packetReceive >> msg_receive){
            std::cout << message_from << msg_receive << std::endl;
        }
    }
}

void Server(void){
    message_from = "client: ";

    sf::TcpListener listener;
    listener.listen(PORT);
    listener.accept(client_server);
    std::cout << "New client connected: " << client_server.getRemoteAddress() << std::endl;
}

bool Client(void){
    message_from = "server: ";

    if(client_server.connect(IPADDRESS, PORT) == sf::Socket::Done){
        std::cout << "Connected\n";
        return true;
    }
    return false;
}

void GetInput(void){
    std::string msg = "";

    if( sf::Keyboard::isKeyPressed(sf::Keyboard::Left) ){
        msg = "LEFT";
    }
    if( sf::Keyboard::isKeyPressed(sf::Keyboard::Right) ){
        msg = "RIGHT";
    }
    if( sf::Keyboard::isKeyPressed(sf::Keyboard::Up) ){
        msg = "UP";
    }
    if( sf::Keyboard::isKeyPressed(sf::Keyboard::Down) ){
        msg = "DOWN";
    }
    if( sf::Keyboard::isKeyPressed(sf::Keyboard::Escape) ){
        msg = "EXIT";
        quit = true;
    }

    if(msg != ""){
        sf::Packet packet;
        packet << msg;
        client_server.send(packet);
    }

    Sleep(60);
}

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'){
        Server();
    }else{
        Client();
    }

    thread = new sf::Thread(&DoStuff);
    thread->launch();

    while(!quit){
        GetInput();
    }

    if(thread){
        thread->wait();
        delete thread;
    }

    return 0;
}

 

5

Network / Re: After sending a packet (seems) receiving wrong header...

« on: November 29, 2014, 09:07:24 pm »

Is possible that the problem is because i launch the serve and the client on the same machine? Hmmm, now i try to communicate between two different computers...

6

Network / Re: AW: Re: AW: After sending a packet (seems) receiving wrong header...

« on: November 29, 2014, 08:02:48 pm »

You could probably start by doing what I've already asked...

Can you provide the output of the client and server?

After i press the UP key on the client. I've attached the screenshot: UP image Server, Bottom image Client.

7

Network / Re: After sending a packet (seems) receiving wrong header...

« on: November 29, 2014, 05:49:53 pm »

I really dont know what can i do! I've tried many solutions included the thread elimination...but nothing! I send header=1 from the server and i receive header=2 on the server and header=1 on the client! Ah, network programming...

8

Network / Re: After sending a packet (seems) receiving wrong header...

« on: November 29, 2014, 12:28:39 pm »

Maybe you dont understand how sockets actually work. The "server" is really just an application with an open socket which can accept connections. The "client" is basically the same thing thing except its distributed. Each client has their own socket in which they connect to the server's socket, so the server always knows who is sending data to it. The same thing applies to clients. If you have a p2p thing setup with SFML, the client will know which socket sent them data, be it the server or another client.

As for your problem, it probably has something to do with your threading. You arent synchronizing the data in anyway so theres probably a race condition there. Also you should avoid using global variables.

Ok, gambit i understand the problem. The clients arent communicating together so they all communicate with the server and the server will communicate back to all the clients...correct?

But for the problem of the "race" condition, there is no shared piece of code i must protect so what i have to synchronyze? The server shows the correct header=1 sended from the client, but the client recieves a message with the header=2 as if it was sended from the server, but the data were sended only from the client with header=1...

9

Network / SOLVED - After sending a packet (seems) receiving wrong header...

« on: November 29, 2014, 12:29:16 am »

Hi all,
i've modified the chat example adding to the packet sended an header (1 client, 2 sender) to identify if the message was sended from the client or the server. Doing this i think is possible to show on the client side only the messages sended from the server ad reverse.

But for strange reason when i send the packet from the client the received header is 2 and not 1...so the message is not filtered and showing on both client and server! Hmmmmmm...

Here is the simple code:

#include <iostream>
#include <windows.h>
#include <SFML/Network.hpp>
#include <SFML/Window.hpp>

const unsigned short PORT = 5000;
const std::string IPADDRESS("192.168.1.71");//change to suit your needs

sf::TcpSocket client_server;

bool quit = false;

sf::Uint16 header_client = 1;
sf::Uint16 header_server = 2;
sf::Uint16 header = 0;

void DoStuff(void){
    while(!quit){
        std::string msg_receive;
        sf::Uint16 header_receive;
        std::string who = "";

        sf::Packet packetReceive;

        client_server.receive(packetReceive);
        if(packetReceive >> header_receive && packetReceive >> msg_receive){
            if( header_receive == header_client ){
                who = "client: ";
            }else{
                who = "server: ";
            }

            std::cout << "header: " << header << std::endl;
            std::cout << "header_receive: " << header_receive << std::endl;

            if( header_receive != header ){
                std::cout << header_receive << " - " << msg_receive << std::endl;
            }
        }
    }
}

void Server(void){
    header = header_server;

    sf::TcpListener listener;
    listener.listen(PORT);
    listener.accept(client_server);
    std::cout << "New client connected: " << client_server.getRemoteAddress() << std::endl;
}

bool Client(void){
    header = header_client;

    if(client_server.connect(IPADDRESS, PORT) == sf::Socket::Done){
        std::cout << "Connected\n";
        return true;
    }
    return false;
}

void GetInput(void){
    std::string msg = "";

    if( sf::Keyboard::isKeyPressed(sf::Keyboard::Left) ){
        msg = "LEFT";
    }
    if( sf::Keyboard::isKeyPressed(sf::Keyboard::Right) ){
        msg = "RIGHT";
    }
    if( sf::Keyboard::isKeyPressed(sf::Keyboard::Up) ){
        msg = "UP";
    }
    if( sf::Keyboard::isKeyPressed(sf::Keyboard::Down) ){
        msg = "DOWN";
    }
    if( sf::Keyboard::isKeyPressed(sf::Keyboard::Escape) ){
        msg = "EXIT";
        quit = true;
    }

    if(msg != ""){
        sf::Packet packet;
        std::cout << "header: " << header << std::endl;
        packet << header << msg;
        client_server.send(packet);
    }

    Sleep(60);
}

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')
        Server();
    else
        Client();

    thread = new sf::Thread(&DoStuff);
    thread->launch();

    while(!quit){
        GetInput();
    }

    if(thread){
        thread->wait();
        delete thread;
    }

    return 0;
}
 

10

Network / Re: Simple tcp connection with packet send not working..

« on: November 28, 2014, 07:14:44 pm »

Ok, i've got it! I must check for new connections before get new data from a new client...

11

Network / Re: Simple tcp connection with packet send not working..

« on: November 28, 2014, 07:00:06 pm »

Ok, thank you! Now it's working. ...but if i try to launch the client program a second time nothig is sended to the server...why?

Networking is a pain!

Here i post the code again with the tag cpp as you suggested:

Server side:

#include <iostream>
#include <SFML/Network.hpp>

int main(int argc, char* argv[])
{
    // ----- The server -----
    // Create a listener to wait for incoming connections on port 55001
    sf::TcpListener listener;
    listener.listen(5001);
    if (listener.listen(5001) != sf::Socket::Done){
        // error...
    }

    // Wait for a connection
    sf::TcpSocket client;
    if (listener.accept(client) != sf::Socket::Done)
    {
        // error...
}
    std::cout << "New client connected: " << client.getRemoteAddress() << std::endl;
    // Receive a message from the client

    while(true){
        sf::Packet packet;
        client.receive(packet);

        sf::Uint16 x;
        std::string s;
        double d;

        if (packet >> x && packet >> s && packet >> d) {
            std::cout << "x: " << x << ", s: " << s << ", d: " << d << std::endl;
        }
    }
    return 0;
}
 

Client side:

#include <iostream>
#include <SFML/Network.hpp>

int main(int argc, char* argv[])
{
    // ----- The client -----
    sf::TcpSocket socket;

    sf::Socket::Status status = socket.connect("192.168.1.71", 5001);
    if (status != sf::Socket::Done){
        // error...
    }

    sf::Uint16 x = 12;
    std::string s = "hello2";
    double d = 0.7;

    sf::Packet packet;
    packet << x << s << d;

    socket.send(packet);

    return 0;
}

 

12

Network / SOLVED - Simple tcp connection with packet send not working..

« on: November 28, 2014, 04:03:35 pm »

Hi people,
i've read the networking and packet tutorial and tried to put everything in a working example.

So, the connection is accepted from the server showing the client ip...but is not showing the packet client have sended.

Here is the client code:

#include <iostream>
#include <SFML/Network.hpp>

int main(int argc, char* argv[])
{
    // ----- The client -----
    sf::TcpSocket socket;

    sf::Socket::Status status = socket.connect("192.168.1.71", 5001);
    if (status != sf::Socket::Done){
        // error...
    }

    sf::Uint16 x = 10;
    std::string s = "hello";
    double d = 0.6;

    sf::Packet packet;
    packet << x << s << d;

    socket.send(packet);

    return 0;
}


An then, the server code:

#include <iostream>
#include <SFML/Network.hpp>

int main(int argc, char* argv[])
{
    // ----- The server -----
    // Create a listener to wait for incoming connections on port 55001
    sf::TcpListener listener;
    listener.listen(5001);
    if (listener.listen(5001) != sf::Socket::Done){
        // error...
    }

    // Wait for a connection
    sf::TcpSocket client;
    if (listener.accept(client) != sf::Socket::Done)
    {
        // error...
}
    std::cout << "New client connected: " << client.getRemoteAddress() << std::endl;
    // Receive a message from the client

    while(true){
        sf::Packet packet;
        client.receive(packet);

        sf::Uint16 x;
        std::string s;
        double d;

        packet >> x >> s >> d;

        if (packet >> x) {
            std::cout << x << std::endl;
        }
    }
    return 0;
}