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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><!-- /home/reggie/tmp/qt-3.0-reggie-5401/qt-x11-commercial-3.0.5/examples/network/networkprotocol/networkprotocol.doc:5 --><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>A simple NNTP implementation</title><style type="text/css"><!--h3.fn,span.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>A simple NNTP implementation</h1> <p> <p> This example shows how to implement your own <a href="qnetworkprotocol.html">QNetworkProtocol</a>. Theprotocol that was chosen for this example is NTTP. Please note that thisimplementation is very simple since it is designed to be an example. Itshould not be used as a real NNTP implemention.<p> <hr><p> Header file (nntp.h):<p> <pre>/****************************************************************************** $Id: qt/nntp.h 3.0.5 edited Oct 12 2001 $**** Copyright (C) 1992-2000 Trolltech AS. All rights reserved.**** This file is part of an example program for Qt. This example** program may be used, distributed and modified without limitation.*******************************************************************************/#ifndef NNTP_H#define NNTP_H#include <<a href="qsocket-h.html">qsocket.h</a>>#include <<a href="qnetworkprotocol-h.html">qnetworkprotocol.h</a>>class Nntp : public <a href="qnetworkprotocol.html">QNetworkProtocol</a>{ <a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>public: Nntp(); virtual ~Nntp(); virtual int supportedOperations() const;protected: virtual void operationListChildren( <a href="qnetworkoperation.html">QNetworkOperation</a> *op ); virtual void operationGet( <a href="qnetworkoperation.html">QNetworkOperation</a> *op ); <a href="qsocket.html">QSocket</a> *commandSocket; bool connectionReady; bool readGroups; bool readArticle;private: bool checkConnection( <a href="qnetworkoperation.html">QNetworkOperation</a> *op ); void close(); void parseGroups(); void parseArticle();protected slots: void hostFound(); void connected(); void closed(); void readyRead(); void error( int );};#endif</pre><p> <hr><p> Implementation (nntp.cpp):<p> <pre>/****************************************************************************** $Id: qt/nntp.cpp 3.0.5 edited Oct 12 2001 $**** Copyright (C) 1992-2000 Trolltech AS. All rights reserved.**** This file is part of an example program for Qt. This example** program may be used, distributed and modified without limitation.*******************************************************************************/#include "nntp.h"#include <<a href="qurlinfo-h.html">qurlinfo.h</a>>#include <stdlib.h>#include <<a href="qurloperator-h.html">qurloperator.h</a>>#include <<a href="qstringlist-h.html">qstringlist.h</a>>#include <<a href="qregexp-h.html">qregexp.h</a>><a name="f253"></a>Nntp::Nntp() : <a href="qnetworkprotocol.html">QNetworkProtocol</a>(), connectionReady( FALSE ), readGroups( FALSE ), readArticle( FALSE ){ // create the command socket and connect to its signals commandSocket = new <a href="qsocket.html">QSocket</a>( this );<a name="x613"></a> <a href="qobject.html#connect">connect</a>( commandSocket, SIGNAL( <a href="qsocket.html#hostFound">hostFound</a>() ), this, SLOT( hostFound() ) );<a name="x610"></a> <a href="qobject.html#connect">connect</a>( commandSocket, SIGNAL( <a href="qsocket.html#connected">connected</a>() ), this, SLOT( connected() ) );<a name="x611"></a> <a href="qobject.html#connect">connect</a>( commandSocket, SIGNAL( <a href="qsocket.html#connectionClosed">connectionClosed</a>() ), this, SLOT( closed() ) );<a name="x616"></a> <a href="qobject.html#connect">connect</a>( commandSocket, SIGNAL( <a href="qsocket.html#readyRead">readyRead</a>() ), this, SLOT( readyRead() ) );<a name="x612"></a> <a href="qobject.html#connect">connect</a>( commandSocket, SIGNAL( <a href="qsocket.html#error">error</a>( int ) ), this, SLOT( error( int ) ) );}Nntp::~Nntp(){ close(); delete commandSocket;}<a name="x604"></a>void Nntp::<a href="qnetworkprotocol.html#operationListChildren">operationListChildren</a>( <a href="qnetworkoperation.html">QNetworkOperation</a> * ){ // create a command <a href="qstring.html">QString</a> path = <a href="qnetworkprotocol.html#url">url</a>()->path(), cmd;<a name="x620"></a> if ( path.<a href="qstring.html#isEmpty">isEmpty</a>() || path == "/" ) { // if the path is empty or we are in the root dir, // we want to read the list of available newsgroups cmd = "list newsgroups\r\n"; } else if ( <a href="qnetworkprotocol.html#url">url</a>()->isDir() ) { // if the path is a directory (in our case a news group) // we want to list the articles of this group<a name="x623"></a> path = path.<a href="qstring.html#replace">replace</a>( QRegExp( "/" ), "" ); cmd = "listgroup " + path + "\r\n"; } else return; // write the command to the socket<a name="x622"></a><a name="x621"></a><a name="x618"></a> commandSocket-><a href="qsocket.html#writeBlock">writeBlock</a>( cmd.<a href="qstring.html#latin1">latin1</a>(), cmd.<a href="qstring.html#length">length</a>() ); readGroups = TRUE;}<a name="x603"></a>void Nntp::<a href="qnetworkprotocol.html#operationGet">operationGet</a>( <a href="qnetworkoperation.html">QNetworkOperation</a> *op ){ // get the dirPath of the URL (this is our news group) // and the filename (which is the article we want to read)<a name="x601"></a> <a href="qurl.html">QUrl</a> u( op-><a href="qnetworkoperation.html#arg">arg</a>( 0 ) );<a name="x625"></a><a name="x624"></a> <a href="qstring.html">QString</a> dirPath = u.<a href="qurl.html#dirPath">dirPath</a>(), file = u.<a href="qurl.html#fileName">fileName</a>(); dirPath = dirPath.<a href="qstring.html#replace">replace</a>( QRegExp( "/" ), "" ); // go to the group in which the article is <a href="qstring.html">QString</a> cmd; cmd = "group " + dirPath + "\r\n"; commandSocket-><a href="qsocket.html#writeBlock">writeBlock</a>( cmd.<a href="qstring.html#latin1">latin1</a>(), cmd.<a href="qstring.html#length">length</a>() ); // read the head of the article cmd = "article " + file + "\r\n"; commandSocket-><a href="qsocket.html#writeBlock">writeBlock</a>( cmd.<a href="qstring.html#latin1">latin1</a>(), cmd.<a href="qstring.html#length">length</a>() ); readArticle = TRUE;}<a name="x602"></a>bool Nntp::<a href="qnetworkprotocol.html#checkConnection">checkConnection</a>( <a href="qnetworkoperation.html">QNetworkOperation</a> * ){ // we are connected, return TRUE<a name="x599"></a> if ( commandSocket-><a href="qiodevice.html#isOpen">isOpen</a>() && connectionReady ) return TRUE; // seems that there is no chance to connect⌨️ 快捷键说明
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