Function runTcpClient

examples/sockets/TCP.cpp:109–153

/////////////////////////////////////////////////////// Create a client, connect it to a server, display the welcome message and send an answer. ///////////////////////////////////////////////////////

///
////////////////////////////////////////////////////////////
void runTcpClient(unsigned short port, bool tls)
{
    // Ask for the server address
    std::optional<sf::IpAddress> server;
    do
    {
        std::cout << "Type the address or name of the server to connect to: ";
        std::string hostname;
        std::cin >> hostname;
        if (const auto addresses = sf::Dns::resolve(hostname); addresses.has_value() && !addresses->empty())
            server = addresses->front();
    } while (!server.has_value());

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

    // Connect to the server
    if (socket.connect(server.value(), port) != sf::Socket::Status::Done)
        return;
    std::cout << "Connected to server " << server.value() << std::endl;

    if (tls)
    {
        // Setup TLS
        if (socket.setupTlsClient(commonName, certificate) != sf::TcpSocket::TlsStatus::HandshakeComplete)
            return;
        std::cout << "TLS set up" << std::endl;

        if (auto ciphersuite = socket.getCurrentCiphersuiteName(); ciphersuite)
            std::cout << "Ciphersuite in use: " << *ciphersuite << std::endl;
    }

    // Receive a message from the server
    std::array<char, 128> in{};
    std::size_t           received = 0;
    if (socket.receive(in.data(), in.size(), received) != sf::Socket::Status::Done)
        return;
    std::cout << "Message received from the server: " << std::quoted(in.data()) << std::endl;

    // Send an answer to the server
    static constexpr std::string_view out = "Hi, I'm a client";
    if (socket.send(out.data(), out.size()) != sf::Socket::Status::Done)
        return;
    std::cout << "Message sent to the server: " << std::quoted(out.data()) << std::endl;
}