Class Poco::Net::StreamSocket
Author: Applied Informatics Software Engineering GmbH and Contributors

# Poco::Net

# class StreamSocket

Library: Net
Package: Sockets
Header: Poco/Net/StreamSocket.h

## Description

This class provides an interface to a TCP stream socket.

## Inheritance

Direct Base Classes: Socket

All Base Classes: Socket

Known Derived Classes: DialogSocket, SecureStreamSocket, WebSocket

## Member Summary

Member Functions: connect, connectNB, operator =, receiveBytes, sendBytes, sendUrgent, shutdown, shutdownReceive, shutdownSend

Inherited Functions: address, available, close, getBlocking, getKeepAlive, getLinger, getNoDelay, getOOBInline, getOption, getReceiveBufferSize, getReceiveTimeout, getReuseAddress, getReusePort, getSendBufferSize, getSendTimeout, impl, init, operator !=, operator <, operator <=, operator =, operator ==, operator >, operator >=, peerAddress, poll, secure, select, setBlocking, setKeepAlive, setLinger, setNoDelay, setOOBInline, setOption, setReceiveBufferSize, setReceiveTimeout, setReuseAddress, setReusePort, setSendBufferSize, setSendTimeout, sockfd, supportsIPv4, supportsIPv6

## Constructors

### StreamSocket

StreamSocket();

Creates an unconnected stream socket.

Before sending or receiving data, the socket must be connected with a call to connect().

### StreamSocket

explicit StreamSocket(
const SocketAddress & address
);

Creates a stream socket and connects it to the socket specified by address.

### StreamSocket

explicit StreamSocket(
SocketAddress::Family family
);

Creates an unconnected stream socket for the given address family.

This is useful if certain socket options (like send and receive buffer) sizes, that must be set before connecting the socket, will be set later on.

### StreamSocket

StreamSocket(
const Socket & socket
);

Creates the StreamSocket with the SocketImpl from another socket. The SocketImpl must be a StreamSocketImpl, otherwise an InvalidArgumentException will be thrown.

### StreamSocket

StreamSocket(
SocketImpl * pImpl
);

Creates the Socket and attaches the given SocketImpl. The socket takes ownership of the SocketImpl.

The SocketImpl must be a StreamSocketImpl, otherwise an InvalidArgumentException will be thrown.

## Destructor

### ~StreamSocket

virtual ~StreamSocket();

Destroys the StreamSocket.

## Member Functions

### connect

void connect(
const SocketAddress & address
);

Initializes the socket and establishes a connection to the TCP server at the given address.

Can also be used for UDP sockets. In this case, no connection is established. Instead, incoming and outgoing packets are restricted to the specified address.

### connect

void connect(
const SocketAddress & address,
const Poco::Timespan & timeout
);

Initializes the socket, sets the socket timeout and establishes a connection to the TCP server at the given address.

### connectNB

void connectNB(
const SocketAddress & address
);

Initializes the socket and establishes a connection to the TCP server at the given address. Prior to opening the connection the socket is set to nonblocking mode.

### operator =

StreamSocket & operator = (
const Socket & socket
);

Assignment operator.

Releases the socket's SocketImpl and attaches the SocketImpl from the other socket and increments the reference count of the SocketImpl.

### receiveBytes

int receiveBytes(
void * buffer,
int length,
int flags = 0
);

Receives data from the socket and stores it in buffer. Up to length bytes are received.

Returns the number of bytes received. A return value of 0 means a graceful shutdown of the connection from the peer.

Throws a TimeoutException if a receive timeout has been set and nothing is received within that interval. Throws a NetException (or a subclass) in case of other errors.

### receiveBytes

int receiveBytes(
Poco::FIFOBuffer & buffer
);

Receives data from the socket and stores it in buffer. Up to length bytes are received. FIFOBuffer has writable/readable transition notifications which may be enabled to notify the caller when the buffer transitions between empty, partially full and full states.

Returns the number of bytes received. A return value of 0 means a graceful shutdown of the connection from the peer.

Throws a TimeoutException if a receive timeout has been set and nothing is received within that interval. Throws a NetException (or a subclass) in case of other errors.

### sendBytes

int sendBytes(
const void * buffer,
int length,
int flags = 0
);

Sends the contents of the given buffer through the socket.

Returns the number of bytes sent, which may be less than the number of bytes specified.

Certain socket implementations may also return a negative value denoting a certain condition.

### sendBytes

int sendBytes(
Poco::FIFOBuffer & buffer
);

Sends the contents of the given buffer through the socket. FIFOBuffer has writable/readable transition notifications which may be enabled to notify the caller when the buffer transitions between empty, partially full and full states.

Returns the number of bytes sent, which may be less than the number of bytes specified.

Certain socket implementations may also return a negative value denoting a certain condition.

### sendUrgent

void sendUrgent(
unsigned char data
);

Sends one byte of urgent data through the socket.

The data is sent with the MSG_OOB flag.

The preferred way for a socket to receive urgent data is by enabling the SO_OOBINLINE option.

### shutdown

void shutdown();

Shuts down both the receiving and the sending part of the socket connection.

### shutdownReceive

void shutdownReceive();

Shuts down the receiving part of the socket connection.

### shutdownSend

void shutdownSend();

Shuts down the sending part of the socket connection.