QServerSocket

Section: Misc. Reference Manual Pages (3qt)
Updated: 2 February 2007
Index Return to Main Contents
 

NAME

QServerSocket - TCP-based server  

SYNOPSIS

#include <qserversocket.h>

Inherits QObject.

 

Public Members


QServerSocket ( Q_UINT16 port, int backlog = 1, QObject * parent = 0, const char * name = 0 )

QServerSocket ( const QHostAddress & address, Q_UINT16 port, int backlog = 1, QObject * parent = 0, const char * name = 0 )

QServerSocket ( QObject * parent = 0, const char * name = 0 )

virtual ~QServerSocket ()

bool ok () const

Q_UINT16 port () const

int socket () const

virtual void setSocket ( int socket )

QHostAddress address () const

virtual void newConnection ( int socket ) = 0
 

Protected Members


QSocketDevice * socketDevice ()
 

DESCRIPTION

The QServerSocket class provides a TCP-based server.

This class is a convenience class for accepting incoming TCP connections. You can specify the port or have QServerSocket pick one, and listen on just one address or on all the machine's addresses.

Using the API is very simple: subclass QServerSocket, call the constructor of your choice, and implement newConnection() to handle new incoming connections. There is nothing more to do.

(Note that due to lack of support in the underlying APIs, QServerSocket cannot accept or reject connections conditionally.)

See also QSocket, QSocketDevice, QHostAddress, QSocketNotifier, and Input/Output and Networking.  

MEMBER FUNCTION DOCUMENTATION

 

QServerSocket::QServerSocket ( Q_UINT16 port, int backlog = 1, QObject * parent = 0, const char * name = 0 )

Creates a server socket object, that will serve the given port on all the addresses of this host. If port is 0, QServerSocket will pick a suitable port in a system-dependent manner. Use backlog to specify how many pending connections the server can have.

The parent and name arguments are passed on to the QObject constructor.

Warning: On Tru64 Unix systems a value of 0 for backlog means that you don't accept any connections at all; you should specify a value larger than 0.  

QServerSocket::QServerSocket ( const QHostAddress & address, Q_UINT16 port, int backlog = 1, QObject * parent = 0, const char * name = 0 )

Creates a server socket object, that will serve the given port only on the given address. Use backlog to specify how many pending connections the server can have.

The parent and name arguments are passed on to the QObject constructor.

Warning: On Tru64 Unix systems a value of 0 for backlog means that you don't accept any connections at all; you should specify a value larger than 0.  

QServerSocket::QServerSocket ( QObject * parent = 0, const char * name = 0 )

Construct an empty server socket.

This constructor, in combination with setSocket(), allows us to use the QServerSocket class as a wrapper for other socket types (e.g. Unix Domain Sockets under Unix).

The parent and name arguments are passed on to the QObject constructor.

See also setSocket().  

QServerSocket::~QServerSocket () [virtual]

Destroys the socket.

This causes any backlogged connections (connections that have reached the host, but not yet been completely set up by calling QSocketDevice::accept()) to be severed.

Existing connections continue to exist; this only affects the acceptance of new connections.  

QHostAddress QServerSocket::address () const

Returns the address on which this object listens, or 0.0.0.0 if this object listens on more than one address. ok() must be TRUE before calling this function.

See also port() and QSocketDevice::address().  

void QServerSocket::newConnection ( int socket ) [pure virtual]

This pure virtual function is responsible for setting up a new incoming connection. socket is the fd (file descriptor) for the newly accepted connection.  

bool QServerSocket::ok () const

Returns TRUE if the construction succeeded; otherwise returns FALSE.  

Q_UINT16 QServerSocket::port () const

Returns the port number on which this server socket listens. This is always non-zero; if you specify 0 in the constructor, QServerSocket will pick a non-zero port itself. ok() must be TRUE before calling this function.

See also address() and QSocketDevice::port().

Example: network/httpd/httpd.cpp.  

void QServerSocket::setSocket ( int socket ) [virtual]

Sets the socket to use socket. bind() and listen() should already have been called for socket.

This allows us to use the QServerSocket class as a wrapper for other socket types (e.g. Unix Domain Sockets).  

int QServerSocket::socket () const

Returns the operating system socket.  

QSocketDevice * QServerSocket::socketDevice () [protected]

Returns a pointer to the internal socket device. The returned pointer is 0 if there is no connection or pending connection.

There is normally no need to manipulate the socket device directly since this class does all the necessary setup for most client or server socket applications.

 

SEE ALSO

http://doc.trolltech.com/qserversocket.html http://www.trolltech.com/faq/tech.html  

COPYRIGHT

Copyright 1992-2007 Trolltech ASA, http://www.trolltech.com. See the license file included in the distribution for a complete license statement.  

AUTHOR

Generated automatically from the source code.  

BUGS

If you find a bug in Qt, please report it as described in http://doc.trolltech.com/bughowto.html. Good bug reports help us to help you. Thank you. The definitive Qt documentation is provided in HTML format; it is located at $QTDIR/doc/html and can be read using Qt Assistant or with a web browser. This man page is provided as a convenience for those users who prefer man pages, although this format is not officially supported by Trolltech. If you find errors in this manual page, please report them to qt-bugs@trolltech.com. Please include the name of the manual page (qserversocket.3qt) and the Qt version (3.3.8).