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<title>A simple NNTP implementation</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>A simple NNTP implementation</h1>
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<p>
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<p> This example shows how to implement your own <a href="ntqnetworkprotocol.html">TQNetworkProtocol</a>. The
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protocol that was chosen for this example is NTTP. Please note that this
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implementation is very simple since it is designed to be an example. It
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should not be used as a real NNTP implemention.
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<p> <hr>
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<p> Header file (nntp.h):
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<p> <pre>/****************************************************************************
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** $Id: qt/nntp.h 3.3.8 edited Jan 11 14:37 $
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**
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** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
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**
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** This file is part of an example program for TQt. This example
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** program may be used, distributed and modified without limitation.
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**
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*****************************************************************************/
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#ifndef NNTP_H
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#define NNTP_H
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#include <<a href="qsocket-h.html">ntqsocket.h</a>>
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#include <<a href="qnetworkprotocol-h.html">ntqnetworkprotocol.h</a>>
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class Nntp : public <a href="ntqnetworkprotocol.html">TQNetworkProtocol</a>
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{
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<a href="metaobjects.html#TQ_OBJECT">TQ_OBJECT</a>
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public:
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Nntp();
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virtual ~Nntp();
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virtual int supportedOperations() const;
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protected:
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virtual void operationListChildren( <a href="qnetworkoperation.html">TQNetworkOperation</a> *op );
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virtual void operationGet( <a href="qnetworkoperation.html">TQNetworkOperation</a> *op );
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<a href="ntqsocket.html">TQSocket</a> *commandSocket;
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bool connectionReady;
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bool readGroups;
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bool readArticle;
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private:
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bool checkConnection( <a href="qnetworkoperation.html">TQNetworkOperation</a> *op );
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void close();
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void parseGroups();
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void parseArticle();
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protected slots:
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void hostFound();
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void connected();
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void closed();
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void readyRead();
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void error( int );
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};
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#endif
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</pre>
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<p> <hr>
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<p> Implementation (nntp.cpp):
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<p> <pre>/****************************************************************************
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** $Id: qt/nntp.cpp 3.3.8 edited Jan 11 14:37 $
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**
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** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
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**
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** This file is part of an example program for TQt. This example
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** program may be used, distributed and modified without limitation.
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**
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*****************************************************************************/
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#include "nntp.h"
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#include <<a href="qurlinfo-h.html">ntqurlinfo.h</a>>
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#include <stdlib.h>
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#include <<a href="qurloperator-h.html">ntqurloperator.h</a>>
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#include <<a href="qstringlist-h.html">ntqstringlist.h</a>>
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#include <<a href="qregexp-h.html">ntqregexp.h</a>>
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<a name="f288"></a>Nntp::Nntp()
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: <a href="ntqnetworkprotocol.html">TQNetworkProtocol</a>(), connectionReady( FALSE ),
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readGroups( FALSE ), readArticle( FALSE )
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{
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// create the command socket and connect to its signals
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commandSocket = new <a href="ntqsocket.html">TQSocket</a>( this );
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<a name="x684"></a> <a href="ntqobject.html#connect">connect</a>( commandSocket, SIGNAL( <a href="ntqsocket.html#hostFound">hostFound</a>() ),
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this, SLOT( hostFound() ) );
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<a name="x681"></a> <a href="ntqobject.html#connect">connect</a>( commandSocket, SIGNAL( <a href="ntqsocket.html#connected">connected</a>() ),
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this, SLOT( connected() ) );
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<a name="x682"></a> <a href="ntqobject.html#connect">connect</a>( commandSocket, SIGNAL( <a href="ntqsocket.html#connectionClosed">connectionClosed</a>() ),
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this, SLOT( closed() ) );
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<a name="x687"></a> <a href="ntqobject.html#connect">connect</a>( commandSocket, SIGNAL( <a href="ntqsocket.html#readyRead">readyRead</a>() ),
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this, SLOT( readyRead() ) );
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<a name="x683"></a> <a href="ntqobject.html#connect">connect</a>( commandSocket, SIGNAL( <a href="ntqsocket.html#error">error</a>( int ) ),
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this, SLOT( error( int ) ) );
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}
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Nntp::~Nntp()
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{
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close();
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delete commandSocket;
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}
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<a name="x675"></a>void Nntp::<a href="ntqnetworkprotocol.html#operationListChildren">operationListChildren</a>( <a href="qnetworkoperation.html">TQNetworkOperation</a> * )
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{
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// create a command
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<a href="ntqstring.html">TQString</a> path = <a href="ntqnetworkprotocol.html#url">url</a>()->path(), cmd;
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<a name="x691"></a> if ( path.<a href="ntqstring.html#isEmpty">isEmpty</a>() || path == "/" ) {
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// if the path is empty or we are in the root dir,
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// we want to read the list of available newsgroups
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cmd = "list newsgroups\r\n";
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} else if ( <a href="ntqnetworkprotocol.html#url">url</a>()->isDir() ) {
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// if the path is a directory (in our case a news group)
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// we want to list the articles of this group
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<a name="x694"></a> path = path.<a href="ntqstring.html#replace">replace</a>( "/", "" );
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cmd = "listgroup " + path + "\r\n";
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} else
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return;
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// write the command to the socket
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<a name="x693"></a><a name="x692"></a><a name="x689"></a> commandSocket-><a href="ntqsocket.html#writeBlock">writeBlock</a>( cmd.<a href="ntqstring.html#latin1">latin1</a>(), cmd.<a href="ntqstring.html#length">length</a>() );
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readGroups = TRUE;
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}
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<a name="x674"></a>void Nntp::<a href="ntqnetworkprotocol.html#operationGet">operationGet</a>( <a href="qnetworkoperation.html">TQNetworkOperation</a> *op )
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{
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// get the dirPath of the URL (this is our news group)
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// and the filename (which is the article we want to read)
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<a name="x672"></a> <a href="ntqurl.html">TQUrl</a> u( op-><a href="qnetworkoperation.html#arg">arg</a>( 0 ) );
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<a name="x696"></a><a name="x695"></a> <a href="ntqstring.html">TQString</a> dirPath = u.<a href="ntqurl.html#dirPath">dirPath</a>(), file = u.<a href="ntqurl.html#fileName">fileName</a>();
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dirPath = dirPath.<a href="ntqstring.html#replace">replace</a>( "/", "" );
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// go to the group in which the article is
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<a href="ntqstring.html">TQString</a> cmd;
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cmd = "group " + dirPath + "\r\n";
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commandSocket-><a href="ntqsocket.html#writeBlock">writeBlock</a>( cmd.<a href="ntqstring.html#latin1">latin1</a>(), cmd.<a href="ntqstring.html#length">length</a>() );
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// read the head of the article
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cmd = "article " + file + "\r\n";
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commandSocket-><a href="ntqsocket.html#writeBlock">writeBlock</a>( cmd.<a href="ntqstring.html#latin1">latin1</a>(), cmd.<a href="ntqstring.html#length">length</a>() );
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readArticle = TRUE;
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}
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<a name="x673"></a>bool Nntp::<a href="ntqnetworkprotocol.html#checkConnection">checkConnection</a>( <a href="qnetworkoperation.html">TQNetworkOperation</a> * )
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{
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// we are connected, return TRUE
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<a name="x670"></a> if ( commandSocket-><a href="ntqiodevice.html#isOpen">isOpen</a>() && connectionReady )
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return TRUE;
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// seems that there is no chance to connect
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if ( commandSocket-><a href="ntqiodevice.html#isOpen">isOpen</a>() )
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return FALSE;
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// don't call connectToHost() if we are already trying to connect
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<a name="x688"></a> if ( commandSocket-><a href="ntqsocket.html#state">state</a>() == TQSocket::Connecting )
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return FALSE;
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// start connecting
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connectionReady = FALSE;
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<a name="x680"></a> commandSocket-><a href="ntqsocket.html#connectToHost">connectToHost</a>( <a href="ntqnetworkprotocol.html#url">url</a>()->host(),
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<a href="ntqnetworkprotocol.html#url">url</a>()->port() != -1 ? url()->port() : 119 );
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return FALSE;
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}
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void <a name="f289"></a>Nntp::close()
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{
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// close the command socket
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if ( commandSocket-><a href="ntqiodevice.html#isOpen">isOpen</a>() ) {
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commandSocket-><a href="ntqsocket.html#writeBlock">writeBlock</a>( "quit\r\n", strlen( "quit\r\n" ) );
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<a name="x679"></a> commandSocket-><a href="ntqsocket.html#close">close</a>();
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}
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}
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<a name="x676"></a>int Nntp::<a href="ntqnetworkprotocol.html#supportedOperations">supportedOperations</a>() const
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{
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// we only support listing children and getting data
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return OpListChildren | OpGet;
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}
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void <a name="f290"></a>Nntp::hostFound()
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{
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if ( <a href="ntqnetworkprotocol.html#url">url</a>() )
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emit connectionStateChanged( ConHostFound, tr( "Host %1 found" ).arg( <a href="ntqnetworkprotocol.html#url">url</a>()->host() ) );
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else
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emit connectionStateChanged( ConHostFound, tr( "Host found" ) );
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}
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void <a name="f291"></a>Nntp::connected()
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{
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if ( <a href="ntqnetworkprotocol.html#url">url</a>() )
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emit connectionStateChanged( ConConnected, tr( "Connected to host %1" ).arg( <a href="ntqnetworkprotocol.html#url">url</a>()->host() ) );
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else
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emit connectionStateChanged( ConConnected, tr( "Connected to host" ) );
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}
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void <a name="f292"></a>Nntp::closed()
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{
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if ( <a href="ntqnetworkprotocol.html#url">url</a>() )
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emit connectionStateChanged( ConClosed, tr( "Connection to %1 closed" ).arg( <a href="ntqnetworkprotocol.html#url">url</a>()->host() ) );
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else
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emit connectionStateChanged( ConClosed, tr( "Connection closed" ) );
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}
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void <a name="f293"></a>Nntp::readyRead()
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{
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// new data arrived on the command socket
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// of we should read the list of available groups, let's do so
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if ( readGroups ) {
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parseGroups();
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return;
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}
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// of we should read an article, let's do so
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if ( readArticle ) {
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parseArticle();
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return;
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}
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// read the new data from the socket
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<a href="ntqcstring.html">TQCString</a> s;
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<a name="x677"></a><a name="x668"></a> s.<a href="ntqcstring.html#resize">resize</a>( commandSocket-><a href="ntqsocket.html#bytesAvailable">bytesAvailable</a>() + 1 );
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<a name="x685"></a><a name="x671"></a> commandSocket-><a href="ntqsocket.html#readBlock">readBlock</a>( s.<a href="ntqmemarray.html#data">data</a>(), commandSocket-><a href="ntqsocket.html#bytesAvailable">bytesAvailable</a>() );
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if ( !url() )
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return;
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// of the code of the server response was 200, we know that the
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// server is ready to get commands from us now
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<a name="x664"></a> if ( s.<a href="ntqcstring.html#left">left</a>( 3 ) == "200" )
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connectionReady = TRUE;
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}
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void <a name="f294"></a>Nntp::parseGroups()
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{
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<a name="x678"></a> if ( !commandSocket-><a href="ntqsocket.html#canReadLine">canReadLine</a>() )
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return;
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// read one line after the other
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while ( commandSocket-><a href="ntqsocket.html#canReadLine">canReadLine</a>() ) {
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<a name="x686"></a> <a href="ntqstring.html">TQString</a> s = commandSocket-><a href="ntqsocket.html#readLine">readLine</a>();
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// if the line starts with a dot, all groups or articles have been listed,
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// so we finished processing the listChildren() command
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if ( s[ 0 ] == '.' ) {
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|
|
|
readGroups = FALSE;
|
|
|
|
|
<a href="ntqnetworkprotocol.html#operationInProgress">operationInProgress</a>()->setState( StDone );
|
|
|
|
|
emit finished( <a href="ntqnetworkprotocol.html#operationInProgress">operationInProgress</a>() );
|
|
|
|
|
return;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// if the code of the server response is 215 or 211
|
|
|
|
|
// the next line will be the first group or article (depending on what we read).
|
|
|
|
|
// So let others know that we start reading now...
|
|
|
|
|
if ( s.<a href="ntqcstring.html#left">left</a>( 3 ) == "215" || s.<a href="ntqcstring.html#left">left</a>( 3 ) == "211" ) {
|
|
|
|
|
<a href="ntqnetworkprotocol.html#operationInProgress">operationInProgress</a>()->setState( StInProgress );
|
|
|
|
|
emit start( <a href="ntqnetworkprotocol.html#operationInProgress">operationInProgress</a>() );
|
|
|
|
|
continue;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// parse the line and create a TQUrlInfo object
|
|
|
|
|
// which describes the child (group or article)
|
|
|
|
|
<a name="x663"></a> bool tab = s.<a href="ntqcstring.html#find">find</a>( '\t' ) != -1;
|
|
|
|
|
<a name="x666"></a> <a href="ntqstring.html">TQString</a> group = s.<a href="ntqcstring.html#mid">mid</a>( 0, s.<a href="ntqcstring.html#find">find</a>( tab ? '\t' : ' ' ) );
|
|
|
|
|
<a href="ntqurlinfo.html">TQUrlInfo</a> inf;
|
|
|
|
|
<a name="x700"></a> inf.<a href="ntqurlinfo.html#setName">setName</a>( group );
|
|
|
|
|
<a href="ntqstring.html">TQString</a> path = <a href="ntqnetworkprotocol.html#url">url</a>()->path();
|
|
|
|
|
<a name="x698"></a> inf.<a href="ntqurlinfo.html#setDir">setDir</a>( path.<a href="ntqstring.html#isEmpty">isEmpty</a>() || path == "/" );
|
|
|
|
|
<a name="x702"></a> inf.<a href="ntqurlinfo.html#setSymLink">setSymLink</a>( FALSE );
|
|
|
|
|
<a name="x699"></a><a name="x697"></a> inf.<a href="ntqurlinfo.html#setFile">setFile</a>( !inf.<a href="ntqurlinfo.html#isDir">isDir</a>() );
|
|
|
|
|
<a name="x703"></a> inf.<a href="ntqurlinfo.html#setWritable">setWritable</a>( FALSE );
|
|
|
|
|
<a name="x701"></a> inf.<a href="ntqurlinfo.html#setReadable">setReadable</a>( TRUE );
|
|
|
|
|
|
|
|
|
|
// let others know about our new child
|
|
|
|
|
emit newChild( inf, operationInProgress() );
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
void <a name="f295"></a>Nntp::parseArticle()
|
|
|
|
|
{
|
|
|
|
|
if ( !commandSocket-><a href="ntqsocket.html#canReadLine">canReadLine</a>() )
|
|
|
|
|
return;
|
|
|
|
|
|
|
|
|
|
// read an article one line after the other
|
|
|
|
|
while ( commandSocket-><a href="ntqsocket.html#canReadLine">canReadLine</a>() ) {
|
|
|
|
|
<a href="ntqstring.html">TQString</a> s = commandSocket-><a href="ntqsocket.html#readLine">readLine</a>();
|
|
|
|
|
|
|
|
|
|
// if the line starts with a dot, we finished reading something
|
|
|
|
|
if ( s[ 0 ] == '.' ) {
|
|
|
|
|
readArticle = FALSE;
|
|
|
|
|
<a href="ntqnetworkprotocol.html#operationInProgress">operationInProgress</a>()->setState( StDone );
|
|
|
|
|
emit finished( <a href="ntqnetworkprotocol.html#operationInProgress">operationInProgress</a>() );
|
|
|
|
|
return;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
<a name="x669"></a> if ( s.<a href="ntqcstring.html#right">right</a>( 1 ) == "\n" )
|
|
|
|
|
<a name="x667"></a><a name="x665"></a> s.<a href="ntqcstring.html#remove">remove</a>( s.<a href="ntqcstring.html#length">length</a>() - 1, 1 );
|
|
|
|
|
|
|
|
|
|
// emit the new data of the article which we read
|
|
|
|
|
<a name="x690"></a> emit data( TQCString( s.<a href="ntqstring.html#ascii">ascii</a>() ), operationInProgress() );
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
void <a name="f296"></a>Nntp::error( int code )
|
|
|
|
|
{
|
|
|
|
|
if ( code == TQSocket::ErrHostNotFound ||
|
|
|
|
|
code == TQSocket::ErrConnectionRefused ) {
|
|
|
|
|
// this signal is called if connecting to the server failed
|
|
|
|
|
if ( <a href="ntqnetworkprotocol.html#operationInProgress">operationInProgress</a>() ) {
|
|
|
|
|
<a href="ntqstring.html">TQString</a> msg = <a href="ntqobject.html#tr">tr</a>( "Host not found or couldn't connect to: \n" + url()->host() );
|
|
|
|
|
<a href="ntqnetworkprotocol.html#operationInProgress">operationInProgress</a>()->setState( StFailed );
|
|
|
|
|
<a href="ntqnetworkprotocol.html#operationInProgress">operationInProgress</a>()->setProtocolDetail( msg );
|
|
|
|
|
<a href="ntqnetworkprotocol.html#operationInProgress">operationInProgress</a>()->setErrorCode( (int)ErrHostNotFound );
|
|
|
|
|
<a href="ntqnetworkprotocol.html#clearOperationQueue">clearOperationQueue</a>();
|
|
|
|
|
emit finished( <a href="ntqnetworkprotocol.html#operationInProgress">operationInProgress</a>() );
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
</pre>
|
|
|
|
|
|
|
|
|
|
<p>See also <a href="network-examples.html">Network Examples</a>.
|
|
|
|
|
|
|
|
|
|
<!-- eof -->
|
|
|
|
|
<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>TQt 3.3.8</div>
|
|
|
|
|
</table></div></address></body>
|
|
|
|
|
</html>
|
