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• sf
• TcpListener

Public Types | Public Member Functions | Static Public Attributes | Protected Types | Protected Member Functions | List of all members

sf::TcpListener Class Reference

Network module

Socket that listens to new TCP connections. More...

#include <SFML/Network/TcpListener.hpp>

Inheritance diagram for sf::TcpListener:

Public Types
enum class	Status {   Done , NotReady , Partial , Disconnected ,   Error }
	Status codes that may be returned by socket functions. More...

Public Member Functions
	TcpListener ()
	Default constructor.
unsigned short	getLocalPort () const
	Get the port to which the socket is bound locally.
Status	listen (unsigned short port, IpAddress address=IpAddress::Any)
	Start listening for incoming connection attempts.
void	close ()
	Stop listening and close the socket.
Status	accept (TcpSocket &socket)
	Accept a new connection.
void	setBlocking (bool blocking)
	Set the blocking state of the socket.
bool	isBlocking () const
	Tell whether the socket is in blocking or non-blocking mode.

Static Public Attributes
static constexpr unsigned short	AnyPort {0}
	Some special values used by sockets.

Protected Types
enum class	Type { Tcp , Udp }
	Types of protocols that the socket can use. More...

Protected Member Functions
SocketHandle	getNativeHandle () const
	Return the internal handle of the socket.
void	create ()
	Create the internal representation of the socket.
void	create (SocketHandle handle)
	Create the internal representation of the socket from a socket handle.

Detailed Description

Socket that listens to new TCP connections.

A listener socket is a special type of socket that listens to a given port and waits for connections on that port.

This is all it can do.

When a new connection is received, you must call accept and the listener returns a new instance of sf::TcpSocket that is properly initialized and can be used to communicate with the new client.

Listener sockets are specific to the TCP protocol, UDP sockets are connectionless and can therefore communicate directly. As a consequence, a listener socket will always return the new connections as sf::TcpSocket instances.

A listener is automatically closed on destruction, like all other types of socket. However if you want to stop listening before the socket is destroyed, you can call its close() function.

Usage example:

// Create a listener socket and make it wait for new

// connections on port 55001

sf::TcpListener listener;

listener.listen(55001);

// Endless loop that waits for new connections

while (running)

{

sf::TcpSocket client;

if (listener.accept(client) == sf::Socket::Done)

{

// A new client just connected!

std::cout << "New connection received from " << client.getRemoteAddress().value() << std::endl;

doSomethingWith(client);

}

}

sf::Socket::Status::Done

@ Done

The socket has sent / received the data.

sf::TcpListener

Socket that listens to new TCP connections.

Definition TcpListener.hpp:45

sf::TcpListener::listen

Status listen(unsigned short port, IpAddress address=IpAddress::Any)

Start listening for incoming connection attempts.

sf::TcpListener::accept

Status accept(TcpSocket &socket)

Accept a new connection.

sf::TcpSocket

Specialized socket using the TCP protocol.

Definition TcpSocket.hpp:54

sf::TcpSocket::getRemoteAddress

std::optional< IpAddress > getRemoteAddress() const

Get the address of the connected peer.

See also

sf::TcpSocket, sf::Socket

Definition at line 44 of file TcpListener.hpp.

Member Enumeration Documentation

◆ Status

enum class sf::Socket::Status

stronginherited

Status codes that may be returned by socket functions.

Enumerator
Done	The socket has sent / received the data.
NotReady	The socket is not ready to send / receive data yet.
Partial	The socket sent a part of the data.
Disconnected	The TCP socket has been disconnected.
Error	An unexpected error happened.

Definition at line 48 of file Socket.hpp.

◆ Type

enum class sf::Socket::Type

strongprotectedinherited

Types of protocols that the socket can use.

Enumerator
Tcp	TCP protocol.
Udp	UDP protocol.

Definition at line 128 of file Socket.hpp.

Constructor & Destructor Documentation

◆ TcpListener()

sf::TcpListener::TcpListener

(

)

Default constructor.

Member Function Documentation

◆ accept()

Status sf::TcpListener::accept ( TcpSocket & socket )

nodiscard

Accept a new connection.

If the socket is in blocking mode, this function will not return until a connection is actually received.

Parameters

socket

Socket that will hold the new connection

Returns

Status code

See also

listen

◆ close()

void sf::TcpListener::close

(

)

Stop listening and close the socket.

This function gracefully stops the listener. If the socket is not listening, this function has no effect.

See also

listen

◆ create() [1/2]

void sf::Socket::create ( )

protectedinherited

Create the internal representation of the socket.

This function can only be accessed by derived classes.

◆ create() [2/2]

void sf::Socket::create ( SocketHandle handle )

protectedinherited

Create the internal representation of the socket from a socket handle.

This function can only be accessed by derived classes.

Parameters

handle

OS-specific handle of the socket to wrap

◆ getLocalPort()

unsigned short sf::TcpListener::getLocalPort ( ) const

nodiscard

Get the port to which the socket is bound locally.

If the socket is not listening to a port, this function returns 0.

Returns

Port to which the socket is bound

See also

listen

◆ getNativeHandle()

SocketHandle sf::Socket::getNativeHandle ( ) const

nodiscardprotectedinherited

Return the internal handle of the socket.

The returned handle may be invalid if the socket was not created yet (or already destroyed). This function can only be accessed by derived classes.

Returns

The internal (OS-specific) handle of the socket

◆ isBlocking()

bool sf::Socket::isBlocking ( ) const

nodiscardinherited

Tell whether the socket is in blocking or non-blocking mode.

Returns

true if the socket is blocking, false otherwise

See also

setBlocking

◆ listen()

Status sf::TcpListener::listen ( unsigned short port, IpAddress address = IpAddress::Any )

nodiscard

Start listening for incoming connection attempts.

This function makes the socket start listening on the specified port, waiting for incoming connection attempts.

If the socket is already listening on a port when this function is called, it will stop listening on the old port before starting to listen on the new port.

When providing sf::Socket::AnyPort as port, the listener will request an available port from the system. The chosen port can be retrieved by calling getLocalPort().

Parameters

port	Port to listen on for incoming connection attempts
address	Address of the interface to listen on

Returns

Status code

See also

accept, close

◆ setBlocking()

void sf::Socket::setBlocking ( bool blocking )

inherited

Set the blocking state of the socket.

In blocking mode, calls will not return until they have completed their task. For example, a call to Receive in blocking mode won't return until some data was actually received. In non-blocking mode, calls will always return immediately, using the return code to signal whether there was data available or not. By default, all sockets are blocking.

Parameters

blocking

true to set the socket as blocking, false for non-blocking

See also

isBlocking

Member Data Documentation

◆ AnyPort

unsigned short sf::Socket::AnyPort {0}

staticconstexprinherited

Some special values used by sockets.

Special value that tells the system to pick any available port

Definition at line 62 of file Socket.hpp.

---

The documentation for this class was generated from the following file:

• TcpListener.hpp