Detailed 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.
This file is part of the Qt toolkit.
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Trolltech. All Rights Reserved.
