<!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>TQSocketDevice 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>TQSocketDevice Class Reference<br><small>[<a href="network.html">network module</a>]</small></h1> <p>The TQSocketDevice class provides a platform-independent low-level socket API. <a href="#details">More...</a> <p><tt>#include <<a href="qsocketdevice-h.html">ntqsocketdevice.h</a>></tt> <p>Inherits <a href="ntqiodevice.html">TQIODevice</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="#TQSocketDevice"><b>TQSocketDevice</b></a> ( Type type = Stream )</li> <li class=fn><a href="#TQSocketDevice-2"><b>TQSocketDevice</b></a> ( Type type, Protocol protocol, int dummy )</li> <li class=fn><a href="#TQSocketDevice-3"><b>TQSocketDevice</b></a> ( int socket, Type type )</li> <li class=fn>virtual <a href="#~TQSocketDevice"><b>~TQSocketDevice</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 TQHostAddress & addr, TQ_UINT16 port )</li> <li class=fn>virtual bool <a href="#bind"><b>bind</b></a> ( const TQHostAddress & address, TQ_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>TQ_LONG <a href="#bytesAvailable"><b>bytesAvailable</b></a> () const</li> <li class=fn>TQ_LONG <a href="#waitForMore"><b>waitForMore</b></a> ( int msecs, bool * timeout = 0 ) const</li> <li class=fn>virtual TQ_LONG <a href="#readBlock"><b>readBlock</b></a> ( char * data, TQ_ULONG maxlen )</li> <li class=fn>virtual TQ_LONG <a href="#writeBlock"><b>writeBlock</b></a> ( const char * data, TQ_ULONG len )</li> <li class=fn>virtual TQ_LONG <a href="#writeBlock-2"><b>writeBlock</b></a> ( const char * data, TQ_ULONG len, const TQHostAddress & host, TQ_UINT16 port )</li> <li class=fn>TQ_UINT16 <a href="#port"><b>port</b></a> () const</li> <li class=fn>TQ_UINT16 <a href="#peerPort"><b>peerPort</b></a> () const</li> <li class=fn>TQHostAddress <a href="#address"><b>address</b></a> () const</li> <li class=fn>TQHostAddress <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 TQSocketDevice 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="ntqsocket.html">TQSocket</a> class provides a much easier and high level alternative, but certain things (like UDP) can't be done with TQSocket and if you need a platform-independent API for those, TQSocketDevice is the right choice. <p> The essential purpose of the class is to provide a <a href="ntqiodevice.html">TQIODevice</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>(), TQSocketDevice detects the protocol family (IPv4, IPv6) automatically. Passing the protocol family to TQSocketDevice'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="ntqsocket.html">TQSocket</a>, <a href="ntqsocketnotifier.html">TQSocketNotifier</a>, <a href="ntqhostaddress.html">TQHostAddress</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>TQSocketDevice::Error</h3> <p> This enum type describes the error states of TQSocketDevice. <ul> <li><tt>TQSocketDevice::NoError</tt> - No error has occurred. <li><tt>TQSocketDevice::AlreadyBound</tt> - The device is already bound, according to <a href="#bind">bind</a>(). <li><tt>TQSocketDevice::Inaccessible</tt> - The operating system or firewall prohibited the action. <li><tt>TQSocketDevice::NoResources</tt> - The operating system ran out of a resource. <li><tt>TQSocketDevice::InternalError</tt> - An internal error occurred in TQSocketDevice. <li><tt>TQSocketDevice::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 TQSocketDevice is not aware of this. So when you call <a href="#writeBlock">writeBlock</a>(), the impossible happens. <li><tt>TQSocketDevice::NoFiles</tt> - The operating system will not let TQSocketDevice open another file. <li><tt>TQSocketDevice::ConnectionRefused</tt> - A connection attempt was rejected by the peer. <li><tt>TQSocketDevice::NetworkFailure</tt> - There is a network failure. <li><tt>TQSocketDevice::UnknownError</tt> - The operating system did something unexpected. </ul> <h3 class=fn><a name="Protocol-enum"></a>TQSocketDevice::Protocol</h3> <p> This enum type describes the protocol family of the socket. Possible values are: <ul> <li><tt>TQSocketDevice::IPv4</tt> - The socket is an IPv4 socket. <li><tt>TQSocketDevice::IPv6</tt> - The socket is an IPv6 socket. <li><tt>TQSocketDevice::Unknown</tt> - The protocol family of the socket is not known. This can happen if you use TQSocketDevice with an already existing socket; it tries to determine the protocol family, but this can fail if the protocol family is not known to TQSocketDevice. </ul><p> <p>See also <a href="#protocol">protocol</a>() and <a href="#setSocket">setSocket</a>(). <h3 class=fn><a name="Type-enum"></a>TQSocketDevice::Type</h3> <p> This enum type describes the type of the socket: <ul> <li><tt>TQSocketDevice::Stream</tt> - a stream socket (TCP, usually) <li><tt>TQSocketDevice::Datagram</tt> - a datagram socket (UDP, usually) </ul> <hr><h2>Member Function Documentation</h2> <h3 class=fn><a name="TQSocketDevice"></a>TQSocketDevice::TQSocketDevice ( <a href="ntqsocketdevice.html#Type-enum">Type</a> type = Stream ) </h3> Creates a TQSocketDevice object for a stream or datagram socket. <p> The <em>type</em> argument must be either <a href="#Type-enum">TQSocketDevice::Stream</a> for a reliable, connection-oriented TCP socket, or <a href="#Type-enum">TQSocketDevice::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="TQSocketDevice-2"></a>TQSocketDevice::TQSocketDevice ( <a href="ntqsocketdevice.html#Type-enum">Type</a> type, <a href="ntqsocketdevice.html#Protocol-enum">Protocol</a> protocol, int dummy ) </h3> Creates a TQSocketDevice object for a stream or datagram socket. <p> The <em>type</em> argument must be either <a href="#Type-enum">TQSocketDevice::Stream</a> for a reliable, connection-oriented TCP socket, or <a href="#Type-enum">TQSocketDevice::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="TQSocketDevice-3"></a>TQSocketDevice::TQSocketDevice ( int socket, <a href="ntqsocketdevice.html#Type-enum">Type</a> type ) </h3> Creates a TQSocketDevice 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">TQSocketDevice::Stream</a> for a reliable, connection-oriented TCP socket, or <a href="#Type-enum">TQSocketDevice::Datagram</a> for an unreliable, connectionless UDP socket. <h3 class=fn><a name="~TQSocketDevice"></a>TQSocketDevice::~TQSocketDevice ()<tt> [virtual]</tt> </h3> Destroys the socket device and closes the socket if it is open. <h3 class=fn>int <a name="accept"></a>TQSocketDevice::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="ntqhostaddress.html">TQHostAddress</a> <a name="address"></a>TQSocketDevice::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>TQSocketDevice::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>TQSocketDevice::bind ( const <a href="ntqhostaddress.html">TQHostAddress</a> & address, TQ_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>TQSocketDevice::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>TQ_LONG <a name="bytesAvailable"></a>TQSocketDevice::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="ntqsocket.html">TQSocket</a> has workarounds to deal with this problem. <h3 class=fn>bool <a name="connect"></a>TQSocketDevice::connect ( const <a href="ntqhostaddress.html">TQHostAddress</a> & addr, TQ_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="ntqsocketdevice.html#Error-enum">Error</a> <a name="error"></a>TQSocketDevice::error () const </h3> Returns the first error seen. <h3 class=fn>bool <a name="isValid"></a>TQSocketDevice::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>TQSocketDevice::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="ntqhostaddress.html">TQHostAddress</a> <a name="peerAddress"></a>TQSocketDevice::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>TQ_UINT16 <a name="peerPort"></a>TQSocketDevice::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>TQ_UINT16 <a name="port"></a>TQSocketDevice::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 TQt always uses native byte order, i.e. 67 is 67 in TQt; there is no need to call htons(). <h3 class=fn><a href="ntqsocketdevice.html#Protocol-enum">Protocol</a> <a name="protocol"></a>TQSocketDevice::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> TQSocketDevice 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>TQ_LONG <a name="readBlock"></a>TQSocketDevice::readBlock ( char * data, TQ_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="ntqiodevice.html#readBlock">TQIODevice</a>. <h3 class=fn>int <a name="receiveBufferSize"></a>TQSocketDevice::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>TQSocketDevice::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>TQSocketDevice::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>TQSocketDevice::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="ntqsocketnotifier.html">TQSocketNotifier</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>TQSocketDevice::setError ( <a href="ntqsocketdevice.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>TQSocketDevice::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>TQSocketDevice::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>TQSocketDevice::setSocket ( int socket, <a href="ntqsocketdevice.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">TQSocketDevice::Stream</a> for a reliable, connection-oriented TCP socket, or <a href="#Type-enum">TQSocketDevice::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="ntqiodevice.html#close">close</a>(). <h3 class=fn>int <a name="socket"></a>TQSocketDevice::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="ntqsocketdevice.html#Type-enum">Type</a> <a name="type"></a>TQSocketDevice::type () const </h3> <p> Returns the socket type which is either <a href="#Type-enum">TQSocketDevice::Stream</a> or <a href="#Type-enum">TQSocketDevice::Datagram</a>. <p> <p>See also <a href="#socket">socket</a>(). <h3 class=fn>TQ_LONG <a name="waitForMore"></a>TQSocketDevice::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>TQ_LONG <a name="writeBlock"></a>TQSocketDevice::writeBlock ( const char * data, TQ_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">TQSocketDevice::Stream</a> sockets. <p>Reimplemented from <a href="ntqiodevice.html#writeBlock">TQIODevice</a>. <h3 class=fn>TQ_LONG <a name="writeBlock-2"></a>TQSocketDevice::writeBlock ( const char * data, TQ_ULONG len, const <a href="ntqhostaddress.html">TQHostAddress</a> & host, TQ_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">TQSocketDevice::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">TQt toolkit</a>. Copyright © 1995-2007 <a href="http://www.trolltech.com/">Trolltech</a>. 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