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| author | Timothy Pearson <kb9vqf@pearsoncomputing.net> | 2011-07-10 15:24:15 -0500 |
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| committer | Timothy Pearson <kb9vqf@pearsoncomputing.net> | 2011-07-10 15:24:15 -0500 |
| commit | bd0f3345a938b35ce6a12f6150373b0955b8dd12 (patch) | |
| tree | 7a520322212d48ebcb9fbe1087e7fca28b76185c /doc/html/qsocketdevice.html | |
| download | qt3-bd0f3345a938b35ce6a12f6150373b0955b8dd12.tar.gz qt3-bd0f3345a938b35ce6a12f6150373b0955b8dd12.zip | |
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diff --git a/doc/html/qsocketdevice.html b/doc/html/qsocketdevice.html new file mode 100644 index 0000000..cf42aec --- /dev/null +++ b/doc/html/qsocketdevice.html @@ -0,0 +1,419 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> +<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/network/qsocketdevice.cpp:59 --> +<html> +<head> +<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> +<title>QSocketDevice Class</title> +<style type="text/css"><!-- +fn { margin-left: 1cm; text-indent: -1cm; } +a:link { color: #004faf; text-decoration: none } +a:visited { color: #672967; text-decoration: none } +body { background: #ffffff; color: black; } +--></style> +</head> +<body> + +<table border="0" cellpadding="0" cellspacing="0" width="100%"> +<tr bgcolor="#E5E5E5"> +<td valign=center> + <a href="index.html"> +<font color="#004faf">Home</font></a> + | <a href="classes.html"> +<font color="#004faf">All Classes</font></a> + | <a href="mainclasses.html"> +<font color="#004faf">Main Classes</font></a> + | <a href="annotated.html"> +<font color="#004faf">Annotated</font></a> + | <a href="groups.html"> +<font color="#004faf">Grouped Classes</font></a> + | <a href="functions.html"> +<font color="#004faf">Functions</font></a> +</td> +<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> + +<p>The QSocketDevice class provides a platform-independent low-level socket API. +<a href="#details">More...</a> +<p><tt>#include <<a href="qsocketdevice-h.html">qsocketdevice.h</a>></tt> +<p>Inherits <a href="qiodevice.html">QIODevice</a>. +<p><a href="qsocketdevice-members.html">List of all member functions.</a> +<h2>Public Members</h2> +<ul> +<li class=fn>enum <a href="#Type-enum"><b>Type</b></a> { Stream, Datagram }</li> +<li class=fn>enum <a href="#Protocol-enum"><b>Protocol</b></a> { IPv4, IPv6, Unknown }</li> +<li class=fn><a href="#QSocketDevice"><b>QSocketDevice</b></a> ( Type type = Stream )</li> +<li class=fn><a href="#QSocketDevice-2"><b>QSocketDevice</b></a> ( Type type, Protocol protocol, int dummy )</li> +<li class=fn><a href="#QSocketDevice-3"><b>QSocketDevice</b></a> ( int socket, Type type )</li> +<li class=fn>virtual <a href="#~QSocketDevice"><b>~QSocketDevice</b></a> ()</li> +<li class=fn>bool <a href="#isValid"><b>isValid</b></a> () const</li> +<li class=fn>Type <a href="#type"><b>type</b></a> () const</li> +<li class=fn>Protocol <a href="#protocol"><b>protocol</b></a> () const</li> +<li class=fn>int <a href="#socket"><b>socket</b></a> () const</li> +<li class=fn>virtual void <a href="#setSocket"><b>setSocket</b></a> ( int socket, Type type )</li> +<li class=fn>bool <a href="#blocking"><b>blocking</b></a> () const</li> +<li class=fn>virtual void <a href="#setBlocking"><b>setBlocking</b></a> ( bool enable )</li> +<li class=fn>bool <a href="#addressReusable"><b>addressReusable</b></a> () const</li> +<li class=fn>virtual void <a href="#setAddressReusable"><b>setAddressReusable</b></a> ( bool enable )</li> +<li class=fn>int <a href="#receiveBufferSize"><b>receiveBufferSize</b></a> () const</li> +<li class=fn>virtual void <a href="#setReceiveBufferSize"><b>setReceiveBufferSize</b></a> ( uint size )</li> +<li class=fn>int <a href="#sendBufferSize"><b>sendBufferSize</b></a> () const</li> +<li class=fn>virtual void <a href="#setSendBufferSize"><b>setSendBufferSize</b></a> ( uint size )</li> +<li class=fn>virtual bool <a href="#connect"><b>connect</b></a> ( const QHostAddress & addr, Q_UINT16 port )</li> +<li class=fn>virtual bool <a href="#bind"><b>bind</b></a> ( const QHostAddress & address, Q_UINT16 port )</li> +<li class=fn>virtual bool <a href="#listen"><b>listen</b></a> ( int backlog )</li> +<li class=fn>virtual int <a href="#accept"><b>accept</b></a> ()</li> +<li class=fn>Q_LONG <a href="#bytesAvailable"><b>bytesAvailable</b></a> () const</li> +<li class=fn>Q_LONG <a href="#waitForMore"><b>waitForMore</b></a> ( int msecs, bool * timeout = 0 ) const</li> +<li class=fn>virtual Q_LONG <a href="#readBlock"><b>readBlock</b></a> ( char * data, Q_ULONG maxlen )</li> +<li class=fn>virtual Q_LONG <a href="#writeBlock"><b>writeBlock</b></a> ( const char * data, Q_ULONG len )</li> +<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> +<li class=fn>Q_UINT16 <a href="#port"><b>port</b></a> () const</li> +<li class=fn>Q_UINT16 <a href="#peerPort"><b>peerPort</b></a> () const</li> +<li class=fn>QHostAddress <a href="#address"><b>address</b></a> () const</li> +<li class=fn>QHostAddress <a href="#peerAddress"><b>peerAddress</b></a> () const</li> +<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> +<li class=fn>Error <a href="#error"><b>error</b></a> () const</li> +</ul> +<h2>Protected Members</h2> +<ul> +<li class=fn>void <a href="#setError"><b>setError</b></a> ( Error err )</li> +</ul> +<hr><a name="details"></a><h2>Detailed Description</h2> + + +The QSocketDevice class provides a platform-independent low-level socket API. + +<p> + +<p> This class provides a low level API for working with sockets. Users of +this class are assumed to have networking experience. For most users the +<a href="qsocket.html">QSocket</a> class provides a much easier and high level alternative, but +certain things (like UDP) can't be done with QSocket and if you need a +platform-independent API for those, QSocketDevice is the right choice. +<p> The essential purpose of the class is to provide a <a href="qiodevice.html">QIODevice</a> that +works on sockets, wrapped in a platform-independent API. +<p> When calling <a href="#connect">connect</a>() or <a href="#bind">bind</a>(), QSocketDevice detects the +protocol family (IPv4, IPv6) automatically. Passing the protocol +family to QSocketDevice's constructor or to <a href="#setSocket">setSocket</a>() forces +creation of a socket device of a specific protocol. If not set, the +protocol will be detected at the first call to connect() or bind(). +<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>. + +<hr><h2>Member Type Documentation</h2> +<h3 class=fn><a name="Error-enum"></a>QSocketDevice::Error</h3> + +<p> This enum type describes the error states of QSocketDevice. +<ul> +<li><tt>QSocketDevice::NoError</tt> - No error has occurred. +<li><tt>QSocketDevice::AlreadyBound</tt> - The device is already bound, according to <a href="#bind">bind</a>(). +<li><tt>QSocketDevice::Inaccessible</tt> - The operating system or firewall prohibited +the action. +<li><tt>QSocketDevice::NoResources</tt> - The operating system ran out of a resource. +<li><tt>QSocketDevice::InternalError</tt> - An internal error occurred in QSocketDevice. +<li><tt>QSocketDevice::Impossible</tt> - An attempt was made to do something which makes +no sense. For example: +<pre> + ::close( sd->socket() ); + sd->writeBlock( someData, 42 ); + </pre> + +The libc ::close() closes the socket, but QSocketDevice is not aware +of this. So when you call <a href="#writeBlock">writeBlock</a>(), the impossible happens. +<li><tt>QSocketDevice::NoFiles</tt> - The operating system will not let QSocketDevice open +another file. +<li><tt>QSocketDevice::ConnectionRefused</tt> - A connection attempt was rejected by the +peer. +<li><tt>QSocketDevice::NetworkFailure</tt> - There is a network failure. +<li><tt>QSocketDevice::UnknownError</tt> - The operating system did something +unexpected. +</ul> +<h3 class=fn><a name="Protocol-enum"></a>QSocketDevice::Protocol</h3> + +<p> This enum type describes the protocol family of the socket. Possible values +are: +<ul> +<li><tt>QSocketDevice::IPv4</tt> - The socket is an IPv4 socket. +<li><tt>QSocketDevice::IPv6</tt> - The socket is an IPv6 socket. +<li><tt>QSocketDevice::Unknown</tt> - The protocol family of the socket is not known. This can +happen if you use QSocketDevice with an already existing socket; it +tries to determine the protocol family, but this can fail if the +protocol family is not known to QSocketDevice. +</ul><p> <p>See also <a href="#protocol">protocol</a>() and <a href="#setSocket">setSocket</a>(). + +<h3 class=fn><a name="Type-enum"></a>QSocketDevice::Type</h3> + +<p> This enum type describes the type of the socket: +<ul> +<li><tt>QSocketDevice::Stream</tt> - a stream socket (TCP, usually) +<li><tt>QSocketDevice::Datagram</tt> - a datagram socket (UDP, usually) +</ul> +<hr><h2>Member Function Documentation</h2> +<h3 class=fn><a name="QSocketDevice"></a>QSocketDevice::QSocketDevice ( <a href="qsocketdevice.html#Type-enum">Type</a> type = Stream ) +</h3> +Creates a QSocketDevice object for a stream or datagram socket. +<p> The <em>type</em> argument must be either <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 UDP socket. +<p> The socket is created as an IPv4 socket. +<p> <p>See also <a href="#blocking">blocking</a>() and <a href="#protocol">protocol</a>(). + +<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 ) +</h3> +Creates a QSocketDevice object for a stream or datagram socket. +<p> The <em>type</em> argument must be either <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 UDP socket. +<p> The <em>protocol</em> indicates whether the socket should be of type IPv4 +or IPv6. Passing <a href="#Protocol-enum">Unknown</a> is not meaningful in this context and you +should avoid using (it creates an IPv4 socket, but your code is not easily +readable). +<p> The argument <em>dummy</em> is necessary for compatibility with some +compilers. +<p> <p>See also <a href="#blocking">blocking</a>() and <a href="#protocol">protocol</a>(). + +<h3 class=fn><a name="QSocketDevice-3"></a>QSocketDevice::QSocketDevice ( int socket, <a href="qsocketdevice.html#Type-enum">Type</a> type ) +</h3> +Creates a QSocketDevice object for 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. + +<h3 class=fn><a name="~QSocketDevice"></a>QSocketDevice::~QSocketDevice ()<tt> [virtual]</tt> +</h3> +Destroys the socket device and closes the socket if it is open. + +<h3 class=fn>int <a name="accept"></a>QSocketDevice::accept ()<tt> [virtual]</tt> +</h3> +Extracts the first connection from the queue of pending +connections for this socket and returns a new socket identifier. +Returns -1 if the operation failed. +<p> <p>See also <a href="#bind">bind</a>() and <a href="#listen">listen</a>(). + +<h3 class=fn><a href="qhostaddress.html">QHostAddress</a> <a name="address"></a>QSocketDevice::address () const +</h3> +Returns the address of this socket device. This may be 0.0.0.0 for +a while, but is set to something sensible as soon as a sensible +value is available. + +<h3 class=fn>bool <a name="addressReusable"></a>QSocketDevice::addressReusable () const +</h3> +Returns TRUE if the address of this socket can be used by other +sockets at the same time, and FALSE if this socket claims +exclusive ownership. +<p> <p>See also <a href="#setAddressReusable">setAddressReusable</a>(). + +<h3 class=fn>bool <a name="bind"></a>QSocketDevice::bind ( const <a href="qhostaddress.html">QHostAddress</a> & address, Q_UINT16 port )<tt> [virtual]</tt> +</h3> +Assigns a name to an unnamed socket. The name is the host address +<em>address</em> and the port number <em>port</em>. If the operation succeeds, +<a href="#bind">bind</a>() returns TRUE; otherwise it returns FALSE without changing +what <a href="#port">port</a>() and <a href="#address">address</a>() return. +<p> bind() is used by servers for setting up incoming connections. +Call bind() before <a href="#listen">listen</a>(). + +<h3 class=fn>bool <a name="blocking"></a>QSocketDevice::blocking () const +</h3> +Returns TRUE if the socket is valid and in blocking mode; +otherwise returns FALSE. +<p> Note that this function does not set <a href="#error">error</a>(). +<p> <b>Warning:</b> On Windows, this function always returns TRUE since the +ioctlsocket() function is broken. +<p> <p>See also <a href="#setBlocking">setBlocking</a>() and <a href="#isValid">isValid</a>(). + +<h3 class=fn>Q_LONG <a name="bytesAvailable"></a>QSocketDevice::bytesAvailable () const +</h3> +Returns the number of bytes available for reading, or -1 if an +error occurred. +<p> <b>Warning:</b> On Microsoft Windows, we use the ioctlsocket() function +to determine the number of bytes queued on the socket. According +to Microsoft (KB Q125486), ioctlsocket() sometimes returns an +incorrect number. The only safe way to determine the amount of +data on the socket is to read it using <a href="#readBlock">readBlock</a>(). <a href="qsocket.html">QSocket</a> has +workarounds to deal with this problem. + +<h3 class=fn>bool <a name="connect"></a>QSocketDevice::connect ( const <a href="qhostaddress.html">QHostAddress</a> & addr, Q_UINT16 port )<tt> [virtual]</tt> +</h3> +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. +If it returns FALSE, <a href="#error">error</a>() explains why. +<p> Note that error() commonly returns NoError for non-blocking +sockets; this just means that you can call <a href="#connect">connect</a>() again in a +little while and it'll probably succeed. + +<h3 class=fn><a href="qsocketdevice.html#Error-enum">Error</a> <a name="error"></a>QSocketDevice::error () const +</h3> +Returns the first error seen. + +<h3 class=fn>bool <a name="isValid"></a>QSocketDevice::isValid () const +</h3> +Returns TRUE if this is a valid socket; otherwise returns FALSE. +<p> <p>See also <a href="#socket">socket</a>(). + +<h3 class=fn>bool <a name="listen"></a>QSocketDevice::listen ( int backlog )<tt> [virtual]</tt> +</h3> +Specifies how many pending connections a server socket can have. +Returns TRUE if the operation was successful; otherwise returns +FALSE. A <em>backlog</em> value of 50 is quite common. +<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 +called before <a href="#bind">bind</a>() or after <a href="#accept">accept</a>(). +<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> |