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420 lines
23 KiB
420 lines
23 KiB
14 years ago
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/network/qsocketdevice.cpp:59 -->
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>QSocketDevice Class Reference<br><small>[<a href="network.html">network module</a>]</small></h1>
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<p>The QSocketDevice class provides a platform-independent low-level socket API.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qsocketdevice-h.html">qsocketdevice.h</a>></tt>
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<p>Inherits <a href="qiodevice.html">QIODevice</a>.
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<p><a href="qsocketdevice-members.html">List of all member functions.</a>
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<h2>Public Members</h2>
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<ul>
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<li class=fn>enum <a href="#Type-enum"><b>Type</b></a> { Stream, Datagram }</li>
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<li class=fn>enum <a href="#Protocol-enum"><b>Protocol</b></a> { IPv4, IPv6, Unknown }</li>
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<li class=fn><a href="#QSocketDevice"><b>QSocketDevice</b></a> ( Type type = Stream )</li>
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<li class=fn><a href="#QSocketDevice-2"><b>QSocketDevice</b></a> ( Type type, Protocol protocol, int dummy )</li>
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<li class=fn><a href="#QSocketDevice-3"><b>QSocketDevice</b></a> ( int socket, Type type )</li>
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<li class=fn>virtual <a href="#~QSocketDevice"><b>~QSocketDevice</b></a> ()</li>
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<li class=fn>bool <a href="#isValid"><b>isValid</b></a> () const</li>
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<li class=fn>Type <a href="#type"><b>type</b></a> () const</li>
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<li class=fn>Protocol <a href="#protocol"><b>protocol</b></a> () const</li>
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<li class=fn>int <a href="#socket"><b>socket</b></a> () const</li>
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<li class=fn>virtual void <a href="#setSocket"><b>setSocket</b></a> ( int socket, Type type )</li>
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<li class=fn>bool <a href="#blocking"><b>blocking</b></a> () const</li>
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<li class=fn>virtual void <a href="#setBlocking"><b>setBlocking</b></a> ( bool enable )</li>
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<li class=fn>bool <a href="#addressReusable"><b>addressReusable</b></a> () const</li>
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<li class=fn>virtual void <a href="#setAddressReusable"><b>setAddressReusable</b></a> ( bool enable )</li>
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<li class=fn>int <a href="#receiveBufferSize"><b>receiveBufferSize</b></a> () const</li>
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<li class=fn>virtual void <a href="#setReceiveBufferSize"><b>setReceiveBufferSize</b></a> ( uint size )</li>
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<li class=fn>int <a href="#sendBufferSize"><b>sendBufferSize</b></a> () const</li>
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<li class=fn>virtual void <a href="#setSendBufferSize"><b>setSendBufferSize</b></a> ( uint size )</li>
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<li class=fn>virtual bool <a href="#connect"><b>connect</b></a> ( const QHostAddress & addr, Q_UINT16 port )</li>
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<li class=fn>virtual bool <a href="#bind"><b>bind</b></a> ( const QHostAddress & address, Q_UINT16 port )</li>
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<li class=fn>virtual bool <a href="#listen"><b>listen</b></a> ( int backlog )</li>
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<li class=fn>virtual int <a href="#accept"><b>accept</b></a> ()</li>
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<li class=fn>Q_LONG <a href="#bytesAvailable"><b>bytesAvailable</b></a> () const</li>
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<li class=fn>Q_LONG <a href="#waitForMore"><b>waitForMore</b></a> ( int msecs, bool * timeout = 0 ) const</li>
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<li class=fn>virtual Q_LONG <a href="#readBlock"><b>readBlock</b></a> ( char * data, Q_ULONG maxlen )</li>
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<li class=fn>virtual Q_LONG <a href="#writeBlock"><b>writeBlock</b></a> ( const char * data, Q_ULONG len )</li>
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<li class=fn>virtual Q_LONG <a href="#writeBlock-2"><b>writeBlock</b></a> ( const char * data, Q_ULONG len, const QHostAddress & host, Q_UINT16 port )</li>
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<li class=fn>Q_UINT16 <a href="#port"><b>port</b></a> () const</li>
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<li class=fn>Q_UINT16 <a href="#peerPort"><b>peerPort</b></a> () const</li>
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<li class=fn>QHostAddress <a href="#address"><b>address</b></a> () const</li>
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<li class=fn>QHostAddress <a href="#peerAddress"><b>peerAddress</b></a> () const</li>
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<li class=fn>enum <a href="#Error-enum"><b>Error</b></a> { NoError, AlreadyBound, Inaccessible, NoResources, InternalError, Bug = InternalError, Impossible, NoFiles, ConnectionRefused, NetworkFailure, UnknownError }</li>
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<li class=fn>Error <a href="#error"><b>error</b></a> () const</li>
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</ul>
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<h2>Protected Members</h2>
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<ul>
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<li class=fn>void <a href="#setError"><b>setError</b></a> ( Error err )</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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The QSocketDevice class provides a platform-independent low-level socket API.
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<p>
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<p> This class provides a low level API for working with sockets. Users of
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this class are assumed to have networking experience. For most users the
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<a href="qsocket.html">QSocket</a> class provides a much easier and high level alternative, but
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certain things (like UDP) can't be done with QSocket and if you need a
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platform-independent API for those, QSocketDevice is the right choice.
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<p> The essential purpose of the class is to provide a <a href="qiodevice.html">QIODevice</a> that
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works on sockets, wrapped in a platform-independent API.
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<p> When calling <a href="#connect">connect</a>() or <a href="#bind">bind</a>(), QSocketDevice detects the
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protocol family (IPv4, IPv6) automatically. Passing the protocol
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family to QSocketDevice's constructor or to <a href="#setSocket">setSocket</a>() forces
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creation of a socket device of a specific protocol. If not set, the
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protocol will be detected at the first call to connect() or bind().
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<p> <p>See also <a href="qsocket.html">QSocket</a>, <a href="qsocketnotifier.html">QSocketNotifier</a>, <a href="qhostaddress.html">QHostAddress</a>, and <a href="io.html">Input/Output and Networking</a>.
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<hr><h2>Member Type Documentation</h2>
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<h3 class=fn><a name="Error-enum"></a>QSocketDevice::Error</h3>
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<p> This enum type describes the error states of QSocketDevice.
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<ul>
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<li><tt>QSocketDevice::NoError</tt> - No error has occurred.
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<li><tt>QSocketDevice::AlreadyBound</tt> - The device is already bound, according to <a href="#bind">bind</a>().
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<li><tt>QSocketDevice::Inaccessible</tt> - The operating system or firewall prohibited
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the action.
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<li><tt>QSocketDevice::NoResources</tt> - The operating system ran out of a resource.
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<li><tt>QSocketDevice::InternalError</tt> - An internal error occurred in QSocketDevice.
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<li><tt>QSocketDevice::Impossible</tt> - An attempt was made to do something which makes
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no sense. For example:
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<pre>
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::close( sd->socket() );
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sd->writeBlock( someData, 42 );
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</pre>
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The libc ::close() closes the socket, but QSocketDevice is not aware
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of this. So when you call <a href="#writeBlock">writeBlock</a>(), the impossible happens.
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<li><tt>QSocketDevice::NoFiles</tt> - The operating system will not let QSocketDevice open
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another file.
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<li><tt>QSocketDevice::ConnectionRefused</tt> - A connection attempt was rejected by the
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peer.
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<li><tt>QSocketDevice::NetworkFailure</tt> - There is a network failure.
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<li><tt>QSocketDevice::UnknownError</tt> - The operating system did something
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unexpected.
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</ul>
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<h3 class=fn><a name="Protocol-enum"></a>QSocketDevice::Protocol</h3>
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<p> This enum type describes the protocol family of the socket. Possible values
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are:
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<ul>
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<li><tt>QSocketDevice::IPv4</tt> - The socket is an IPv4 socket.
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<li><tt>QSocketDevice::IPv6</tt> - The socket is an IPv6 socket.
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<li><tt>QSocketDevice::Unknown</tt> - The protocol family of the socket is not known. This can
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happen if you use QSocketDevice with an already existing socket; it
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tries to determine the protocol family, but this can fail if the
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protocol family is not known to QSocketDevice.
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</ul><p> <p>See also <a href="#protocol">protocol</a>() and <a href="#setSocket">setSocket</a>().
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<h3 class=fn><a name="Type-enum"></a>QSocketDevice::Type</h3>
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<p> This enum type describes the type of the socket:
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<ul>
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<li><tt>QSocketDevice::Stream</tt> - a stream socket (TCP, usually)
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<li><tt>QSocketDevice::Datagram</tt> - a datagram socket (UDP, usually)
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</ul>
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a name="QSocketDevice"></a>QSocketDevice::QSocketDevice ( <a href="qsocketdevice.html#Type-enum">Type</a> type = Stream )
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</h3>
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Creates a QSocketDevice object for a stream or datagram socket.
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<p> The <em>type</em> argument must be either <a href="#Type-enum">QSocketDevice::Stream</a> for a
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reliable, connection-oriented TCP socket, or <a href="#Type-enum">QSocketDevice::Datagram</a> for an unreliable UDP socket.
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<p> The socket is created as an IPv4 socket.
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<p> <p>See also <a href="#blocking">blocking</a>() and <a href="#protocol">protocol</a>().
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<h3 class=fn><a name="QSocketDevice-2"></a>QSocketDevice::QSocketDevice ( <a href="qsocketdevice.html#Type-enum">Type</a> type, <a href="qsocketdevice.html#Protocol-enum">Protocol</a> protocol, int dummy )
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</h3>
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Creates a QSocketDevice object for a stream or datagram socket.
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<p> The <em>type</em> argument must be either <a href="#Type-enum">QSocketDevice::Stream</a> for a
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reliable, connection-oriented TCP socket, or <a href="#Type-enum">QSocketDevice::Datagram</a> for an unreliable UDP socket.
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<p> The <em>protocol</em> indicates whether the socket should be of type IPv4
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or IPv6. Passing <a href="#Protocol-enum">Unknown</a> is not meaningful in this context and you
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should avoid using (it creates an IPv4 socket, but your code is not easily
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readable).
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<p> The argument <em>dummy</em> is necessary for compatibility with some
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compilers.
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<p> <p>See also <a href="#blocking">blocking</a>() and <a href="#protocol">protocol</a>().
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<h3 class=fn><a name="QSocketDevice-3"></a>QSocketDevice::QSocketDevice ( int socket, <a href="qsocketdevice.html#Type-enum">Type</a> type )
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</h3>
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Creates a QSocketDevice object for the existing socket <em>socket</em>.
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<p> The <em>type</em> argument must match the actual socket type; use <a href="#Type-enum">QSocketDevice::Stream</a> for a reliable, connection-oriented TCP
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socket, or <a href="#Type-enum">QSocketDevice::Datagram</a> for an unreliable,
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connectionless UDP socket.
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<h3 class=fn><a name="~QSocketDevice"></a>QSocketDevice::~QSocketDevice ()<tt> [virtual]</tt>
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</h3>
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Destroys the socket device and closes the socket if it is open.
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<h3 class=fn>int <a name="accept"></a>QSocketDevice::accept ()<tt> [virtual]</tt>
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</h3>
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Extracts the first connection from the queue of pending
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connections for this socket and returns a new socket identifier.
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Returns -1 if the operation failed.
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<p> <p>See also <a href="#bind">bind</a>() and <a href="#listen">listen</a>().
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<h3 class=fn><a href="qhostaddress.html">QHostAddress</a> <a name="address"></a>QSocketDevice::address () const
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</h3>
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Returns the address of this socket device. This may be 0.0.0.0 for
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a while, but is set to something sensible as soon as a sensible
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value is available.
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<h3 class=fn>bool <a name="addressReusable"></a>QSocketDevice::addressReusable () const
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</h3>
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Returns TRUE if the address of this socket can be used by other
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sockets at the same time, and FALSE if this socket claims
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exclusive ownership.
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<p> <p>See also <a href="#setAddressReusable">setAddressReusable</a>().
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<h3 class=fn>bool <a name="bind"></a>QSocketDevice::bind ( const <a href="qhostaddress.html">QHostAddress</a> & address, Q_UINT16 port )<tt> [virtual]</tt>
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</h3>
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Assigns a name to an unnamed socket. The name is the host address
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<em>address</em> and the port number <em>port</em>. If the operation succeeds,
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<a href="#bind">bind</a>() returns TRUE; otherwise it returns FALSE without changing
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what <a href="#port">port</a>() and <a href="#address">address</a>() return.
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<p> bind() is used by servers for setting up incoming connections.
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Call bind() before <a href="#listen">listen</a>().
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<h3 class=fn>bool <a name="blocking"></a>QSocketDevice::blocking () const
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</h3>
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Returns TRUE if the socket is valid and in blocking mode;
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otherwise returns FALSE.
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<p> Note that this function does not set <a href="#error">error</a>().
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<p> <b>Warning:</b> On Windows, this function always returns TRUE since the
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ioctlsocket() function is broken.
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<p> <p>See also <a href="#setBlocking">setBlocking</a>() and <a href="#isValid">isValid</a>().
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<h3 class=fn>Q_LONG <a name="bytesAvailable"></a>QSocketDevice::bytesAvailable () const
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</h3>
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Returns the number of bytes available for reading, or -1 if an
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error occurred.
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<p> <b>Warning:</b> On Microsoft Windows, we use the ioctlsocket() function
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to determine the number of bytes queued on the socket. According
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to Microsoft (KB Q125486), ioctlsocket() sometimes returns an
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incorrect number. The only safe way to determine the amount of
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data on the socket is to read it using <a href="#readBlock">readBlock</a>(). <a href="qsocket.html">QSocket</a> has
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workarounds to deal with this problem.
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<h3 class=fn>bool <a name="connect"></a>QSocketDevice::connect ( const <a href="qhostaddress.html">QHostAddress</a> & addr, Q_UINT16 port )<tt> [virtual]</tt>
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</h3>
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Connects to the IP address and port specified by <em>addr</em> and <em>port</em>. Returns TRUE if it establishes a connection; otherwise returns FALSE.
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If it returns FALSE, <a href="#error">error</a>() explains why.
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<p> Note that error() commonly returns NoError for non-blocking
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sockets; this just means that you can call <a href="#connect">connect</a>() again in a
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little while and it'll probably succeed.
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<h3 class=fn><a href="qsocketdevice.html#Error-enum">Error</a> <a name="error"></a>QSocketDevice::error () const
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</h3>
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Returns the first error seen.
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<h3 class=fn>bool <a name="isValid"></a>QSocketDevice::isValid () const
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</h3>
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Returns TRUE if this is a valid socket; otherwise returns FALSE.
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<p> <p>See also <a href="#socket">socket</a>().
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<h3 class=fn>bool <a name="listen"></a>QSocketDevice::listen ( int backlog )<tt> [virtual]</tt>
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</h3>
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Specifies how many pending connections a server socket can have.
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Returns TRUE if the operation was successful; otherwise returns
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FALSE. A <em>backlog</em> value of 50 is quite common.
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<p> The <a href="#listen">listen</a>() call only applies to sockets where <a href="#type">type</a>() is <a href="#Type-enum">Stream</a>, i.e. not to <a href="#Type-enum">Datagram</a> sockets. listen() must not be
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called before <a href="#bind">bind</a>() or after <a href="#accept">accept</a>().
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<p> <p>See also <a href="#bind">bind</a>() and <a href="#accept">accept</a>().
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qhostaddress.html">QHostAddress</a> <a name="peerAddress"></a>QSocketDevice::peerAddress () const
|
||
|
|
</h3>
|
||
|
|
Returns the address of the port this socket device is connected
|
||
|
|
to. This may be 0.0.0.0 for a while, but is set to something
|
||
|
|
sensible as soon as a sensible value is available.
|
||
|
|
<p> Note that for Datagram sockets, this is the source port of the
|
||
|
|
last packet received.
|
||
|
|
|
||
|
|
<h3 class=fn>Q_UINT16 <a name="peerPort"></a>QSocketDevice::peerPort () const
|
||
|
|
</h3>
|
||
|
|
Returns the port number of the port this socket device is
|
||
|
|
connected to. This may be 0 for a while, but is set to something
|
||
|
|
sensible as soon as a sensible value is available.
|
||
|
|
<p> Note that for Datagram sockets, this is the source port of the
|
||
|
|
last packet received, and that it is in native byte order.
|
||
|
|
|
||
|
|
<h3 class=fn>Q_UINT16 <a name="port"></a>QSocketDevice::port () const
|
||
|
|
</h3>
|
||
|
|
Returns the port number of this socket device. This may be 0 for a
|
||
|
|
while, but is set to something sensible as soon as a sensible
|
||
|
|
value is available.
|
||
|
|
<p> Note that Qt always uses native byte order, i.e. 67 is 67 in Qt;
|
||
|
|
there is no need to call htons().
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qsocketdevice.html#Protocol-enum">Protocol</a> <a name="protocol"></a>QSocketDevice::protocol () const
|
||
|
|
</h3>
|
||
|
|
Returns the socket's protocol family, which is one of <a href="#Protocol-enum">Unknown</a>, <a href="#Protocol-enum">IPv4</a>,
|
||
|
|
or <a href="#Protocol-enum">IPv6</a>.
|
||
|
|
<p> QSocketDevice either creates a socket with a well known protocol family or
|
||
|
|
it uses an already existing socket. In the first case, this function
|
||
|
|
returns the protocol family it was constructed with. In the second case, it
|
||
|
|
tries to determine the protocol family of the socket; if this fails, it
|
||
|
|
returns <a href="#Protocol-enum">Unknown</a>.
|
||
|
|
<p> <p>See also <a href="#Protocol-enum">Protocol</a> and <a href="#setSocket">setSocket</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>Q_LONG <a name="readBlock"></a>QSocketDevice::readBlock ( char * data, Q_ULONG maxlen )<tt> [virtual]</tt>
|
||
|
|
</h3>
|
||
|
|
Reads <em>maxlen</em> bytes from the socket into <em>data</em> and returns the
|
||
|
|
number of bytes read. Returns -1 if an error occurred. Returning 0
|
||
|
|
is not an error. For Stream sockets, 0 is returned when the remote
|
||
|
|
host closes the connection. For Datagram sockets, 0 is a valid
|
||
|
|
datagram size.
|
||
|
|
|
||
|
|
<p>Reimplemented from <a href="qiodevice.html#readBlock">QIODevice</a>.
|
||
|
|
<h3 class=fn>int <a name="receiveBufferSize"></a>QSocketDevice::receiveBufferSize () const
|
||
|
|
</h3>
|
||
|
|
Returns the size of the operating system receive buffer.
|
||
|
|
<p> <p>See also <a href="#setReceiveBufferSize">setReceiveBufferSize</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>int <a name="sendBufferSize"></a>QSocketDevice::sendBufferSize () const
|
||
|
|
</h3>
|
||
|
|
Returns the size of the operating system send buffer.
|
||
|
|
<p> <p>See also <a href="#setSendBufferSize">setSendBufferSize</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>void <a name="setAddressReusable"></a>QSocketDevice::setAddressReusable ( bool enable )<tt> [virtual]</tt>
|
||
|
|
</h3>
|
||
|
|
Sets the address of this socket to be usable by other sockets too
|
||
|
|
if <em>enable</em> is TRUE, and to be used exclusively by this socket if
|
||
|
|
<em>enable</em> is FALSE.
|
||
|
|
<p> When a socket is reusable, other sockets can use the same port
|
||
|
|
number (and IP address), which is generally useful. Of course
|
||
|
|
other sockets cannot use the same
|
||
|
|
(address,port,peer-address,peer-port) 4-tuple as this socket, so
|
||
|
|
there is no risk of confusing the two TCP connections.
|
||
|
|
<p> <p>See also <a href="#addressReusable">addressReusable</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>void <a name="setBlocking"></a>QSocketDevice::setBlocking ( bool enable )<tt> [virtual]</tt>
|
||
|
|
</h3>
|
||
|
|
Makes the socket blocking if <em>enable</em> is TRUE or nonblocking if
|
||
|
|
<em>enable</em> is FALSE.
|
||
|
|
<p> Sockets are blocking by default, but we recommend using
|
||
|
|
nonblocking socket operations, especially for GUI programs that
|
||
|
|
need to be responsive.
|
||
|
|
<p> <b>Warning:</b> On Windows, this function should be used with care since
|
||
|
|
whenever you use a <a href="qsocketnotifier.html">QSocketNotifier</a> on Windows, the socket is
|
||
|
|
immediately made nonblocking.
|
||
|
|
<p> <p>See also <a href="#blocking">blocking</a>() and <a href="#isValid">isValid</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>void <a name="setError"></a>QSocketDevice::setError ( <a href="qsocketdevice.html#Error-enum">Error</a> err )<tt> [protected]</tt>
|
||
|
|
</h3>
|
||
|
|
Allows subclasses to set the error state to <em>err</em>.
|
||
|
|
|
||
|
|
<h3 class=fn>void <a name="setReceiveBufferSize"></a>QSocketDevice::setReceiveBufferSize ( uint size )<tt> [virtual]</tt>
|
||
|
|
</h3>
|
||
|
|
Sets the size of the operating system receive buffer to <em>size</em>.
|
||
|
|
<p> The operating system receive buffer size effectively limits two
|
||
|
|
things: how much data can be in transit at any one moment, and how
|
||
|
|
much data can be received in one iteration of the main event loop.
|
||
|
|
<p> The default is operating system-dependent. A socket that receives
|
||
|
|
large amounts of data is probably best with a buffer size of
|
||
|
|
49152.
|
||
|
|
|
||
|
|
<h3 class=fn>void <a name="setSendBufferSize"></a>QSocketDevice::setSendBufferSize ( uint size )<tt> [virtual]</tt>
|
||
|
|
</h3>
|
||
|
|
Sets the size of the operating system send buffer to <em>size</em>.
|
||
|
|
<p> The operating system send buffer size effectively limits how much
|
||
|
|
data can be in transit at any one moment.
|
||
|
|
<p> The default is operating system-dependent. A socket that sends
|
||
|
|
large amounts of data is probably best with a buffer size of
|
||
|
|
49152.
|
||
|
|
|
||
|
|
<h3 class=fn>void <a name="setSocket"></a>QSocketDevice::setSocket ( int socket, <a href="qsocketdevice.html#Type-enum">Type</a> type )<tt> [virtual]</tt>
|
||
|
|
</h3>
|
||
|
|
Sets the socket device to operate on the existing socket <em>socket</em>.
|
||
|
|
<p> The <em>type</em> argument must match the actual socket type; use <a href="#Type-enum">QSocketDevice::Stream</a> for a reliable, connection-oriented TCP
|
||
|
|
socket, or <a href="#Type-enum">QSocketDevice::Datagram</a> for an unreliable,
|
||
|
|
connectionless UDP socket.
|
||
|
|
<p> Any existing socket is closed.
|
||
|
|
<p> <p>See also <a href="#isValid">isValid</a>() and <a href="qiodevice.html#close">close</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>int <a name="socket"></a>QSocketDevice::socket () const
|
||
|
|
</h3>
|
||
|
|
Returns the socket number, or -1 if it is an invalid socket.
|
||
|
|
<p> <p>See also <a href="#isValid">isValid</a>() and <a href="#type">type</a>().
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qsocketdevice.html#Type-enum">Type</a> <a name="type"></a>QSocketDevice::type () const
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
<p> Returns the socket type which is either <a href="#Type-enum">QSocketDevice::Stream</a>
|
||
|
|
or <a href="#Type-enum">QSocketDevice::Datagram</a>.
|
||
|
|
<p> <p>See also <a href="#socket">socket</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>Q_LONG <a name="waitForMore"></a>QSocketDevice::waitForMore ( int msecs, bool * timeout = 0 ) const
|
||
|
|
</h3>
|
||
|
|
Wait up to <em>msecs</em> milliseconds for more data to be available. If
|
||
|
|
<em>msecs</em> is -1 the call will block indefinitely.
|
||
|
|
<p> Returns the number of bytes available for reading, or -1 if an
|
||
|
|
error occurred.
|
||
|
|
<p> If <em>timeout</em> is non-null and no error occurred (i.e. it does not
|
||
|
|
return -1): this function sets <em>*timeout</em> to TRUE, if the reason
|
||
|
|
for returning was that the timeout was reached; otherwise it sets
|
||
|
|
<em>*timeout</em> to FALSE. This is useful to find out if the peer
|
||
|
|
closed the connection.
|
||
|
|
<p> <b>Warning:</b> This is a blocking call and should be avoided in event
|
||
|
|
driven applications.
|
||
|
|
<p> <p>See also <a href="#bytesAvailable">bytesAvailable</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>Q_LONG <a name="writeBlock"></a>QSocketDevice::writeBlock ( const char * data, Q_ULONG len )<tt> [virtual]</tt>
|
||
|
|
</h3>
|
||
|
|
Writes <em>len</em> bytes to the socket from <em>data</em> and returns the
|
||
|
|
number of bytes written. Returns -1 if an error occurred.
|
||
|
|
<p> This is used for <a href="#Type-enum">QSocketDevice::Stream</a> sockets.
|
||
|
|
|
||
|
|
<p>Reimplemented from <a href="qiodevice.html#writeBlock">QIODevice</a>.
|
||
|
|
<h3 class=fn>Q_LONG <a name="writeBlock-2"></a>QSocketDevice::writeBlock ( const char * data, Q_ULONG len, const <a href="qhostaddress.html">QHostAddress</a> & host, Q_UINT16 port )<tt> [virtual]</tt>
|
||
|
|
</h3>
|
||
|
|
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
|
||
|
|
<p> Writes <em>len</em> bytes to the socket from <em>data</em> and returns the
|
||
|
|
number of bytes written. Returns -1 if an error occurred.
|
||
|
|
<p> This is used for <a href="#Type-enum">QSocketDevice::Datagram</a> sockets. You must
|
||
|
|
specify the <em>host</em> and <em>port</em> of the destination of the data.
|
||
|
|
|
||
|
|
<!-- eof -->
|
||
|
|
<hr><p>
|
||
|
|
This file is part of the <a href="index.html">Qt toolkit</a>.
|
||
|
|
Copyright © 1995-2007
|
||
|
|
<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
|
||
|
|
<table width=100% cellspacing=0 border=0><tr>
|
||
|
|
<td>Copyright © 2007
|
||
|
|
<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
|
||
|
|
<td align=right><div align=right>Qt 3.3.8</div>
|
||
|
|
</table></div></address></body>
|
||
|
|
</html>
|