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335 lines
16 KiB
335 lines
16 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/qdns.cpp:1597 -->
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<title>QDns Class</title>
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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>QDns Class Reference<br><small>[<a href="network.html">network module</a>]</small></h1>
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<p>The QDns class provides asynchronous DNS lookups.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qdns-h.html">qdns.h</a>></tt>
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<p>Inherits <a href="qobject.html">QObject</a>.
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<p><a href="qdns-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="#RecordType-enum"><b>RecordType</b></a> { None, A, Aaaa, Mx, Srv, Cname, Ptr, Txt }</li>
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<li class=fn><a href="#QDns"><b>QDns</b></a> ()</li>
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<li class=fn><a href="#QDns-2"><b>QDns</b></a> ( const QString & label, RecordType rr = A )</li>
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<li class=fn><a href="#QDns-3"><b>QDns</b></a> ( const QHostAddress & address, RecordType rr = Ptr )</li>
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<li class=fn>virtual <a href="#~QDns"><b>~QDns</b></a> ()</li>
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<li class=fn>virtual void <a href="#setLabel"><b>setLabel</b></a> ( const QString & label )</li>
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<li class=fn>virtual void <a href="#setLabel-2"><b>setLabel</b></a> ( const QHostAddress & address )</li>
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<li class=fn>QString <a href="#label"><b>label</b></a> () const</li>
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<li class=fn>virtual void <a href="#setRecordType"><b>setRecordType</b></a> ( RecordType rr = A )</li>
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<li class=fn>RecordType <a href="#recordType"><b>recordType</b></a> () const</li>
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<li class=fn>bool <a href="#isWorking"><b>isWorking</b></a> () const</li>
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<li class=fn>QValueList<QHostAddress> <a href="#addresses"><b>addresses</b></a> () const</li>
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<li class=fn>QValueList<MailServer> <a href="#mailServers"><b>mailServers</b></a> () const</li>
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<li class=fn>QValueList<Server> <a href="#servers"><b>servers</b></a> () const</li>
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<li class=fn>QStringList <a href="#hostNames"><b>hostNames</b></a> () const</li>
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<li class=fn>QStringList <a href="#texts"><b>texts</b></a> () const</li>
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<li class=fn>QString <a href="#canonicalName"><b>canonicalName</b></a> () const</li>
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<li class=fn>QStringList <a href="#qualifiedNames"><b>qualifiedNames</b></a> () const</li>
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</ul>
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<h2>Signals</h2>
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<ul>
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<li class=fn>void <a href="#resultsReady"><b>resultsReady</b></a> ()</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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The QDns class provides asynchronous DNS lookups.
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<p>
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<p> Both Windows and Unix provide synchronous DNS lookups; Windows
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provides some asynchronous support too. At the time of writing
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neither operating system provides asynchronous support for
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anything other than hostname-to-address mapping.
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<p> QDns rectifies this shortcoming, by providing asynchronous caching
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lookups for the record types that we expect modern GUI
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applications to need in the near future.
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<p> The class is <em>not</em> straightforward to use (although it is much
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simpler than the native APIs); <a href="qsocket.html">QSocket</a> provides much easier to use
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TCP connection facilities. The aim of QDns is to provide a correct
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and small API to the DNS and nothing more. (We use "correctness"
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to mean that the DNS information is correctly cached, and
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correctly timed out.)
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<p> The API comprises a constructor, functions to set the DNS node
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(the domain in DNS terminology) and record type (<a href="#setLabel">setLabel</a>() and
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<a href="#setRecordType">setRecordType</a>()), the corresponding get functions, an <a href="#isWorking">isWorking</a>()
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function to determine whether QDns is working or reading, a
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<a href="#resultsReady">resultsReady</a>() signal and query functions for the result.
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<p> There is one query function for each RecordType, namely
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<a href="#addresses">addresses</a>(), <a href="#mailServers">mailServers</a>(), <a href="#servers">servers</a>(), <a href="#hostNames">hostNames</a>() and <a href="#texts">texts</a>().
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There are also two generic query functions: <a href="#canonicalName">canonicalName</a>()
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returns the name you'll presumably end up using (the exact meaning
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of this depends on the record type) and <a href="#qualifiedNames">qualifiedNames</a>() returns a
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list of the fully qualified names <a href="#label">label</a>() maps to.
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<p> <p>See also <a href="qsocket.html">QSocket</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="RecordType-enum"></a>QDns::RecordType</h3>
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<p> This enum type defines the record types QDns can handle. The DNS
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provides many more; these are the ones we've judged to be in
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current use, useful for GUI programs and important enough to
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support right away:
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<ul>
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<li><tt>QDns::None</tt> - No information. This exists only so that QDns can
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have a default.
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<li><tt>QDns::A</tt> - IPv4 addresses. By far the most common type.
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<li><tt>QDns::Aaaa</tt> - IPv6 addresses. So far mostly unused.
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<li><tt>QDns::Mx</tt> - Mail eXchanger names. Used for mail delivery.
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<li><tt>QDns::Srv</tt> - SeRVer names. Generic record type for finding
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servers. So far mostly unused.
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<li><tt>QDns::Cname</tt> - Canonical names. Maps from nicknames to the true
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name (the canonical name) for a host.
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<li><tt>QDns::Ptr</tt> - name PoinTeRs. Maps from IPv4 or IPv6 addresses to hostnames.
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<li><tt>QDns::Txt</tt> - arbitrary TeXT for domains.
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</ul><p> We expect that some support for the
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<a href="http://www.dns.net/dnsrd/rfc/rfc2535.html">RFC-2535</a>
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extensions will be added in future versions.
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a name="QDns"></a>QDns::QDns ()
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</h3>
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Constructs a DNS query object with invalid settings for both the
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label and the search type.
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<h3 class=fn><a name="QDns-2"></a>QDns::QDns ( const <a href="qstring.html">QString</a> & label, <a href="qdns.html#RecordType-enum">RecordType</a> rr = A )
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</h3>
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Constructs a DNS query object that will return record type <em>rr</em>
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information about <em>label</em>.
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<p> The DNS lookup is started the next time the application enters the
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event loop. When the result is found the signal <a href="#resultsReady">resultsReady</a>() is
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emitted.
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<p> <em>rr</em> defaults to <a href="#RecordType-enum">A</a>, IPv4 addresses.
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<h3 class=fn><a name="QDns-3"></a>QDns::QDns ( const <a href="qhostaddress.html">QHostAddress</a> & address, <a href="qdns.html#RecordType-enum">RecordType</a> rr = Ptr )
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</h3>
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Constructs a DNS query object that will return record type <em>rr</em>
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information about host address <em>address</em>. The label is set to the
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IN-ADDR.ARPA domain name. This is useful in combination with the
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<a href="#RecordType-enum">Ptr</a> record type (e.g. if you want to look up a hostname for a
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given address).
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<p> The DNS lookup is started the next time the application enters the
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event loop. When the result is found the signal <a href="#resultsReady">resultsReady</a>() is
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emitted.
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<p> <em>rr</em> defaults to <a href="#RecordType-enum">Ptr</a>, that maps addresses to hostnames.
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<h3 class=fn><a name="~QDns"></a>QDns::~QDns ()<tt> [virtual]</tt>
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</h3>
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Destroys the DNS query object and frees its allocated resources.
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<h3 class=fn><a href="qvaluelist.html">QValueList</a><QHostAddress> <a name="addresses"></a>QDns::addresses () const
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</h3>
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Returns a list of the addresses for this name if this QDns object
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has a <a href="#recordType">recordType</a>() of <a href="#RecordType-enum">QDns::A</a> or <a href="#RecordType-enum">QDns::Aaaa</a> and the answer
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is available; otherwise returns an empty list.
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<p> As a special case, if <a href="#label">label</a>() is a valid numeric IP address, this
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function returns that address.
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<p> Note that if you want to iterate over the list, you should iterate
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over a copy, e.g.
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<pre>
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<a href="qvaluelist.html">QValueList</a><QHostAddress> list = myDns.addresses();
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QValueList<QHostAddress>::Iterator it = list.<a href="qvaluelist.html#begin">begin</a>();
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while( it != list.<a href="qvaluelist.html#end">end</a>() ) {
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myProcessing( *it );
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++it;
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}
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</pre>
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<p>
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<h3 class=fn><a href="qstring.html">QString</a> <a name="canonicalName"></a>QDns::canonicalName () const
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</h3>
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Returns the canonical name for this DNS node. (This works
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regardless of what <a href="#recordType">recordType</a>() is set to.)
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<p> If the canonical name isn't known, this function returns a null
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string.
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<p> The canonical name of a DNS node is its full name, or the full
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name of the target of its CNAME. For example, if l.trolltech.com
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is a CNAME to lillian.troll.no, and the search path for QDns is
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"trolltech.com", then the canonical name for all of "lillian",
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"l", "lillian.troll.no." and "l.trolltech.com" is
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"lillian.troll.no.".
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<h3 class=fn><a href="qstringlist.html">QStringList</a> <a name="hostNames"></a>QDns::hostNames () const
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</h3>
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Returns a list of host names if the record type is <a href="#RecordType-enum">Ptr</a>.
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<p> Note that if you want to iterate over the list, you should iterate
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over a copy, e.g.
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<pre>
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<a href="qstringlist.html">QStringList</a> list = myDns.hostNames();
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QStringList::Iterator it = list.<a href="qvaluelist.html#begin">begin</a>();
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while( it != list.<a href="qvaluelist.html#end">end</a>() ) {
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myProcessing( *it );
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++it;
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}
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</pre>
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<p>
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<h3 class=fn>bool <a name="isWorking"></a>QDns::isWorking () const
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</h3>
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Returns TRUE if QDns is doing a lookup for this object (i.e. if it
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does not already have the necessary information); otherwise
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returns FALSE.
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<p> QDns emits the <a href="#resultsReady">resultsReady</a>() signal when the status changes to FALSE.
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<p>Example: <a href="mail-example.html#x705">network/mail/smtp.cpp</a>.
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<h3 class=fn><a href="qstring.html">QString</a> <a name="label"></a>QDns::label () const
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</h3>
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<p> Returns the domain name for which this object returns information.
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<p> <p>See also <a href="#setLabel">setLabel</a>().
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<h3 class=fn><a href="qvaluelist.html">QValueList</a><MailServer> <a name="mailServers"></a>QDns::mailServers () const
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</h3>
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Returns a list of mail servers if the record type is <a href="#RecordType-enum">Mx</a>. The
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class <tt>QDns::MailServer</tt> contains the following public variables:
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<ul>
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<li> <a href="qstring.html">QString</a> QDns::MailServer::name
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<li> Q_UINT16 QDns::MailServer::priority
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</ul>
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<p> Note that if you want to iterate over the list, you should iterate
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over a copy, e.g.
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<pre>
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<a href="qvaluelist.html">QValueList</a><QDns::MailServer> list = myDns.mailServers();
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QValueList<QDns::MailServer>::Iterator it = list.<a href="qvaluelist.html#begin">begin</a>();
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while( it != list.<a href="qvaluelist.html#end">end</a>() ) {
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myProcessing( *it );
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++it;
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}
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</pre>
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<p>
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<p>Example: <a href="mail-example.html#x706">network/mail/smtp.cpp</a>.
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<h3 class=fn><a href="qstringlist.html">QStringList</a> <a name="qualifiedNames"></a>QDns::qualifiedNames () const
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</h3>
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<p> Returns a list of the fully qualified names <a href="#label">label</a>() maps to.
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<p> Note that if you want to iterate over the list, you should iterate
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over a copy, e.g.
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<pre>
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<a href="qstringlist.html">QStringList</a> list = myDns.qualifiedNames();
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QStringList::Iterator it = list.<a href="qvaluelist.html#begin">begin</a>();
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while( it != list.<a href="qvaluelist.html#end">end</a>() ) {
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myProcessing( *it );
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++it;
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}
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</pre>
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<p>
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<h3 class=fn><a href="qdns.html#RecordType-enum">RecordType</a> <a name="recordType"></a>QDns::recordType () const
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</h3>
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<p> Returns the record type of this DNS query object.
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<p> <p>See also <a href="#setRecordType">setRecordType</a>() and <a href="#RecordType-enum">RecordType</a>.
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<h3 class=fn>void <a name="resultsReady"></a>QDns::resultsReady ()<tt> [signal]</tt>
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</h3>
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<p> This signal is emitted when results are available for one of the
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<a href="#qualifiedNames">qualifiedNames</a>().
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<p>Example: <a href="mail-example.html#x707">network/mail/smtp.cpp</a>.
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<h3 class=fn><a href="qvaluelist.html">QValueList</a><Server> <a name="servers"></a>QDns::servers () const
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</h3>
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Returns a list of servers if the record type is <a href="#RecordType-enum">Srv</a>. The class
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<tt>QDns::Server</tt> contains the following public variables:
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<ul>
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<li> <a href="qstring.html">QString</a> QDns::Server::name
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<li> Q_UINT16 QDns::Server::priority
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<li> Q_UINT16 QDns::Server::weight
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<li> Q_UINT16 QDns::Server::port
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</ul>
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<p> Note that if you want to iterate over the list, you should iterate
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over a copy, e.g.
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<pre>
|
||
|
|
<a href="qvaluelist.html">QValueList</a><QDns::Server> list = myDns.servers();
|
||
|
|
QValueList<QDns::Server>::Iterator it = list.<a href="qvaluelist.html#begin">begin</a>();
|
||
|
|
while( it != list.<a href="qvaluelist.html#end">end</a>() ) {
|
||
|
|
myProcessing( *it );
|
||
|
|
++it;
|
||
|
|
}
|
||
|
|
</pre>
|
||
|
|
|
||
|
|
|
||
|
|
<h3 class=fn>void <a name="setLabel"></a>QDns::setLabel ( const <a href="qstring.html">QString</a> & label )<tt> [virtual]</tt>
|
||
|
|
</h3>
|
||
|
|
Sets this DNS query object to query for information about <em>label</em>.
|
||
|
|
<p> This does not change the <a href="#recordType">recordType</a>(), but its <a href="#isWorking">isWorking</a>() status
|
||
|
|
will probably change as a result.
|
||
|
|
<p> The DNS lookup is started the next time the application enters the
|
||
|
|
event loop. When the result is found the signal <a href="#resultsReady">resultsReady</a>() is
|
||
|
|
emitted.
|
||
|
|
|
||
|
|
<h3 class=fn>void <a name="setLabel-2"></a>QDns::setLabel ( const <a href="qhostaddress.html">QHostAddress</a> & address )<tt> [virtual]</tt>
|
||
|
|
</h3>
|
||
|
|
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
|
||
|
|
<p> Sets this DNS query object to query for information about the host
|
||
|
|
address <em>address</em>. The label is set to the IN-ADDR.ARPA domain
|
||
|
|
name. This is useful in combination with the <a href="#RecordType-enum">Ptr</a> record type
|
||
|
|
(e.g. if you want to look up a hostname for a given address).
|
||
|
|
|
||
|
|
<h3 class=fn>void <a name="setRecordType"></a>QDns::setRecordType ( <a href="qdns.html#RecordType-enum">RecordType</a> rr = A )<tt> [virtual]</tt>
|
||
|
|
</h3>
|
||
|
|
Sets this object to query for record type <em>rr</em> records.
|
||
|
|
<p> The DNS lookup is started the next time the application enters the
|
||
|
|
event loop. When the result is found the signal <a href="#resultsReady">resultsReady</a>() is
|
||
|
|
emitted.
|
||
|
|
<p> <p>See also <a href="#RecordType-enum">RecordType</a>.
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qstringlist.html">QStringList</a> <a name="texts"></a>QDns::texts () const
|
||
|
|
</h3>
|
||
|
|
Returns a list of texts if the record type is <a href="#RecordType-enum">Txt</a>.
|
||
|
|
<p> Note that if you want to iterate over the list, you should iterate
|
||
|
|
over a copy, e.g.
|
||
|
|
<pre>
|
||
|
|
<a href="qstringlist.html">QStringList</a> list = myDns.texts();
|
||
|
|
QStringList::Iterator it = list.<a href="qvaluelist.html#begin">begin</a>();
|
||
|
|
while( it != list.<a href="qvaluelist.html#end">end</a>() ) {
|
||
|
|
myProcessing( *it );
|
||
|
|
++it;
|
||
|
|
}
|
||
|
|
</pre>
|
||
|
|
|
||
|
|
|
||
|
|
<!-- 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>
|