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179 lines
9.3 KiB
179 lines
9.3 KiB
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/kernel/qcopchannel_qws.cpp:55 -->
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<title>TQCopChannel 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>TQCopChannel Class Reference</h1>
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<p>The TQCopChannel class provides communication capabilities
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between several clients.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qcopchannel_qws-h.html">qcopchannel_qws.h</a>></tt>
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<p>Inherits <a href="ntqobject.html">TQObject</a>.
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<p><a href="qcopchannel-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><a href="#TQCopChannel"><b>TQCopChannel</b></a> ( const TQCString & channel, TQObject * parent = 0, const char * name = 0 )</li>
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<li class=fn>virtual <a href="#~TQCopChannel"><b>~TQCopChannel</b></a> ()</li>
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<li class=fn>TQCString <a href="#channel"><b>channel</b></a> () const</li>
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<li class=fn>virtual void <a href="#receive"><b>receive</b></a> ( const TQCString & msg, const TQByteArray & data )</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="#received"><b>received</b></a> ( const TQCString & msg, const TQByteArray & data )</li>
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</ul>
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<h2>Static Public Members</h2>
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<ul>
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<li class=fn>bool <a href="#isRegistered"><b>isRegistered</b></a> ( const TQCString & channel )</li>
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<li class=fn>bool <a href="#send-2"><b>send</b></a> ( const TQCString & channel, const TQCString & msg )</li>
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<li class=fn>bool <a href="#send"><b>send</b></a> ( const TQCString & channel, const TQCString & msg, const TQByteArray & data )</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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<p> The TQCopChannel class provides communication capabilities
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between several clients.
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<p> The TQt Cop (TQCOP) is a COmmunication Protocol, allowing clients to
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communicate both within the same address space and between
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different processes.
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<p> Currently, this facility is only available on TQt/Embedded. On X11
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and Windows we are exploring the use of existing standards such as
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DCOP and COM.
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<p> TQCopChannel provides <a href="#send">send</a>() and <a href="#isRegistered">isRegistered</a>() which are static
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functions usable without an object.
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<p> The <a href="#channel">channel</a>() function returns the name of the channel.
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<p> In order to <em>listen</em> to the traffic on a channel, you should
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either subclass TQCopChannel and reimplement <a href="#receive">receive</a>(), or
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<a href="ntqobject.html#connect">connect</a>() to the <a href="#received">received</a>() signal.
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a name="TQCopChannel"></a>TQCopChannel::TQCopChannel ( const <a href="ntqcstring.html">TQCString</a> & channel, <a href="ntqobject.html">TQObject</a> * parent = 0, const char * name = 0 )
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</h3>
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Constructs a TQCop channel and registers it with the server using
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the name <em>channel</em>. The standard <em>parent</em> and <em>name</em> arguments
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are passed on to the <a href="ntqobject.html">TQObject</a> constructor.
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<h3 class=fn><a name="~TQCopChannel"></a>TQCopChannel::~TQCopChannel ()<tt> [virtual]</tt>
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</h3>
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Destroys the client's end of the channel and notifies the server
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that the client has closed its connection. The server will keep
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the channel open until the last registered client detaches.
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<h3 class=fn><a href="ntqcstring.html">TQCString</a> <a name="channel"></a>TQCopChannel::channel () const
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</h3>
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Returns the name of the channel.
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<h3 class=fn>bool <a name="isRegistered"></a>TQCopChannel::isRegistered ( const <a href="ntqcstring.html">TQCString</a> & channel )<tt> [static]</tt>
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</h3>
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Queries the server for the existence of <em>channel</em>.
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<p> Returns TRUE if <em>channel</em> is registered; otherwise returns FALSE.
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<h3 class=fn>void <a name="receive"></a>TQCopChannel::receive ( const <a href="ntqcstring.html">TQCString</a> & msg, const <a href="qbytearray.html">TQByteArray</a> & data )<tt> [virtual]</tt>
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</h3>
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This virtual function allows subclasses of TQCopChannel to process
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data received from their channel.
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<p> The default implementation emits the <a href="#received">received</a>() signal.
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<p> Note that the format of <em>data</em> has to be well defined in order to
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extract the information it contains.
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<p> Example:
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<pre>
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void MyClass::receive( const <a href="ntqcstring.html">TQCString</a> &msg, const <a href="qbytearray.html">TQByteArray</a> &data )
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{
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<a href="ntqdatastream.html">TQDataStream</a> stream( data, <a href="ntqfile.html#open">IO_ReadOnly</a> );
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if ( msg == "execute(TQString,TQString)" ) {
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<a href="ntqstring.html">TQString</a> cmd, arg;
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stream >> cmd >> arg;
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...
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} else if ( msg == "delete(TQString)" ) {
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<a href="ntqstring.html">TQString</a> filenname;
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stream >> filename;
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...
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} else ...
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}
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</pre>
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This example assumes that the <em>msg</em> is a DCOP-style function
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signature and the <em>data</em> contains the function's arguments. (See
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<a href="#send">send</a>().)
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<p> Using the DCOP convention is a recommendation, but not a
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requirement. Whatever convention you use the sender and receiver
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<em>must</em> agree on the argument types.
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<p> <p>See also <a href="#send">send</a>().
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<h3 class=fn>void <a name="received"></a>TQCopChannel::received ( const <a href="ntqcstring.html">TQCString</a> & msg, const <a href="qbytearray.html">TQByteArray</a> & data )<tt> [signal]</tt>
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</h3>
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<p> This signal is emitted with the <em>msg</em> and <em>data</em> whenever the
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<a href="#receive">receive</a>() function gets incoming data.
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<h3 class=fn>bool <a name="send"></a>TQCopChannel::send ( const <a href="ntqcstring.html">TQCString</a> & channel, const <a href="ntqcstring.html">TQCString</a> & msg, const <a href="qbytearray.html">TQByteArray</a> & data )<tt> [static]</tt>
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</h3>
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Send the message <em>msg</em> on channel <em>channel</em> with data <em>data</em>.
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The message will be distributed to all clients subscribed to the
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channel.
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<p> Note that <a href="ntqdatastream.html">TQDataStream</a> provides a convenient way to fill the byte
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array with auxiliary data.
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<p> Example:
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<pre>
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<a href="qbytearray.html">TQByteArray</a> ba;
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<a href="ntqdatastream.html">TQDataStream</a> stream( ba, <a href="ntqfile.html#open">IO_WriteOnly</a> );
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stream << TQString("cat") << TQString("file.txt");
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TQCopChannel::<a href="#send">send</a>( "System/Shell", "execute(TQString,TQString)", ba );
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</pre>
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Here the channel is "System/Shell". The <em>msg</em> is an arbitrary
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string, but in the example we've used the DCOP convention of
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passing a function signature. Such a signature is formatted as
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functionname(types) where types is a list of zero or more
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comma-separated type names, with no whitespace, no consts and no
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pointer or reference marks, i.e. no "*" or "&".
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<p> Using the DCOP convention is a recommendation, but not a
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requirement. Whatever convention you use the sender and receiver
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<em>must</em> agree on the argument types.
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<p> <p>See also <a href="#receive">receive</a>().
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<h3 class=fn>bool <a name="send-2"></a>TQCopChannel::send ( const <a href="ntqcstring.html">TQCString</a> & channel, const <a href="ntqcstring.html">TQCString</a> & msg )<tt> [static]</tt>
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</h3>
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This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p> Send the message <em>msg</em> on channel <em>channel</em>. The message will be
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distributed to all clients subscribed to the <em>channel</em>.
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<p> <p>See also <a href="#receive">receive</a>().
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<!-- eof -->
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<hr><p>
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This file is part of the <a href="index.html">TQt toolkit</a>.
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Copyright © 1995-2007
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<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
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<table width=100% cellspacing=0 border=0><tr>
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<td>Copyright © 2007
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<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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<td align=right><div align=right>TQt 3.3.8</div>
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</table></div></address></body>
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