1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
|
<!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/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"><!--
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="tqnetworkprotocol.html">TQNetworkProtocol</a>. The
protocol that was chosen for this example is NTTP. Please note that this
implementation is very simple since it is designed to be an example. It
should not be used as a real NNTP implemention.
<p> <hr>
<p> Header file (nntp.h):
<p> <pre>/****************************************************************************
** $Id: qt/nntp.h 3.3.8 edited Jan 11 14:37 $
**
** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
**
** This file is part of an example program for TQt. This example
** program may be used, distributed and modified without limitation.
**
*****************************************************************************/
#ifndef NNTP_H
#define NNTP_H
#include <<a href="tqsocket-h.html">tqsocket.h</a>>
#include <<a href="tqnetworkprotocol-h.html">tqnetworkprotocol.h</a>>
class Nntp : public <a href="tqnetworkprotocol.html">TQNetworkProtocol</a>
{
<a href="metaobjects.html#TQ_OBJECT">TQ_OBJECT</a>
public:
Nntp();
virtual ~Nntp();
virtual int supportedOperations() const;
protected:
virtual void operationListChildren( <a href="tqnetworkoperation.html">TQNetworkOperation</a> *op );
virtual void operationGet( <a href="tqnetworkoperation.html">TQNetworkOperation</a> *op );
<a href="tqsocket.html">TQSocket</a> *commandSocket;
bool connectionReady;
bool readGroups;
bool readArticle;
private:
bool checkConnection( <a href="tqnetworkoperation.html">TQNetworkOperation</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 3.3.8 edited Jan 11 14:37 $
**
** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
**
** This file is part of an example program for TQt. This example
** program may be used, distributed and modified without limitation.
**
*****************************************************************************/
#include "nntp.h"
#include <<a href="tqurlinfo-h.html">tqurlinfo.h</a>>
#include <stdlib.h>
#include <<a href="tqurloperator-h.html">tqurloperator.h</a>>
#include <<a href="tqstringlist-h.html">tqstringlist.h</a>>
#include <<a href="tqregexp-h.html">tqregexp.h</a>>
<a name="f288"></a>Nntp::Nntp()
: <a href="tqnetworkprotocol.html">TQNetworkProtocol</a>(), connectionReady( FALSE ),
readGroups( FALSE ), readArticle( FALSE )
{
// create the command socket and connect to its signals
commandSocket = new <a href="tqsocket.html">TQSocket</a>( this );
<a name="x684"></a> <a href="tqobject.html#connect">connect</a>( commandSocket, TQ_SIGNAL( <a href="tqsocket.html#hostFound">hostFound</a>() ),
this, TQ_SLOT( hostFound() ) );
<a name="x681"></a> <a href="tqobject.html#connect">connect</a>( commandSocket, TQ_SIGNAL( <a href="tqsocket.html#connected">connected</a>() ),
this, TQ_SLOT( connected() ) );
<a name="x682"></a> <a href="tqobject.html#connect">connect</a>( commandSocket, TQ_SIGNAL( <a href="tqsocket.html#connectionClosed">connectionClosed</a>() ),
this, TQ_SLOT( closed() ) );
<a name="x687"></a> <a href="tqobject.html#connect">connect</a>( commandSocket, TQ_SIGNAL( <a href="tqsocket.html#readyRead">readyRead</a>() ),
this, TQ_SLOT( readyRead() ) );
<a name="x683"></a> <a href="tqobject.html#connect">connect</a>( commandSocket, TQ_SIGNAL( <a href="tqsocket.html#error">error</a>( int ) ),
this, TQ_SLOT( error( int ) ) );
}
Nntp::~Nntp()
{
close();
delete commandSocket;
}
<a name="x675"></a>void Nntp::<a href="tqnetworkprotocol.html#operationListChildren">operationListChildren</a>( <a href="tqnetworkoperation.html">TQNetworkOperation</a> * )
{
// create a command
<a href="tqstring.html">TQString</a> path = <a href="tqnetworkprotocol.html#url">url</a>()->path(), cmd;
<a name="x691"></a> if ( path.<a href="tqstring.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="tqnetworkprotocol.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="x694"></a> path = path.<a href="tqstring.html#replace">replace</a>( "/", "" );
cmd = "listgroup " + path + "\r\n";
} else
return;
// write the command to the socket
<a name="x693"></a><a name="x692"></a><a name="x689"></a> commandSocket-><a href="tqsocket.html#writeBlock">writeBlock</a>( cmd.<a href="tqstring.html#latin1">latin1</a>(), cmd.<a href="tqstring.html#length">length</a>() );
readGroups = TRUE;
}
<a name="x674"></a>void Nntp::<a href="tqnetworkprotocol.html#operationGet">operationGet</a>( <a href="tqnetworkoperation.html">TQNetworkOperation</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="x672"></a> <a href="tqurl.html">TQUrl</a> u( op-><a href="tqnetworkoperation.html#arg">arg</a>( 0 ) );
<a name="x696"></a><a name="x695"></a> <a href="tqstring.html">TQString</a> dirPath = u.<a href="tqurl.html#dirPath">dirPath</a>(), file = u.<a href="tqurl.html#fileName">fileName</a>();
dirPath = dirPath.<a href="tqstring.html#replace">replace</a>( "/", "" );
// go to the group in which the article is
<a href="tqstring.html">TQString</a> cmd;
cmd = "group " + dirPath + "\r\n";
commandSocket-><a href="tqsocket.html#writeBlock">writeBlock</a>( cmd.<a href="tqstring.html#latin1">latin1</a>(), cmd.<a href="tqstring.html#length">length</a>() );
// read the head of the article
cmd = "article " + file + "\r\n";
commandSocket-><a href="tqsocket.html#writeBlock">writeBlock</a>( cmd.<a href="tqstring.html#latin1">latin1</a>(), cmd.<a href="tqstring.html#length">length</a>() );
readArticle = TRUE;
}
<a name="x673"></a>bool Nntp::<a href="tqnetworkprotocol.html#checkConnection">checkConnection</a>( <a href="tqnetworkoperation.html">TQNetworkOperation</a> * )
{
// we are connected, return TRUE
<a name="x670"></a> if ( commandSocket-><a href="tqiodevice.html#isOpen">isOpen</a>() && connectionReady )
return TRUE;
// seems that there is no chance to connect
if ( commandSocket-><a href="tqiodevice.html#isOpen">isOpen</a>() )
return FALSE;
// don't call connectToHost() if we are already trying to connect
<a name="x688"></a> if ( commandSocket-><a href="tqsocket.html#state">state</a>() == TQSocket::Connecting )
return FALSE;
// start connecting
connectionReady = FALSE;
<a name="x680"></a> commandSocket-><a href="tqsocket.html#connectToHost">connectToHost</a>( <a href="tqnetworkprotocol.html#url">url</a>()->host(),
<a href="tqnetworkprotocol.html#url">url</a>()->port() != -1 ? url()->port() : 119 );
return FALSE;
}
void <a name="f289"></a>Nntp::close()
{
// close the command socket
if ( commandSocket-><a href="tqiodevice.html#isOpen">isOpen</a>() ) {
commandSocket-><a href="tqsocket.html#writeBlock">writeBlock</a>( "quit\r\n", strlen( "quit\r\n" ) );
<a name="x679"></a> commandSocket-><a href="tqsocket.html#close">close</a>();
}
}
<a name="x676"></a>int Nntp::<a href="tqnetworkprotocol.html#supportedOperations">supportedOperations</a>() const
{
// we only support listing children and getting data
return OpListChildren | OpGet;
}
void <a name="f290"></a>Nntp::hostFound()
{
if ( <a href="tqnetworkprotocol.html#url">url</a>() )
emit connectionStateChanged( ConHostFound, tr( "Host %1 found" ).arg( <a href="tqnetworkprotocol.html#url">url</a>()->host() ) );
else
emit connectionStateChanged( ConHostFound, tr( "Host found" ) );
}
void <a name="f291"></a>Nntp::connected()
{
if ( <a href="tqnetworkprotocol.html#url">url</a>() )
emit connectionStateChanged( ConConnected, tr( "Connected to host %1" ).arg( <a href="tqnetworkprotocol.html#url">url</a>()->host() ) );
else
emit connectionStateChanged( ConConnected, tr( "Connected to host" ) );
}
void <a name="f292"></a>Nntp::closed()
{
if ( <a href="tqnetworkprotocol.html#url">url</a>() )
emit connectionStateChanged( ConClosed, tr( "Connection to %1 closed" ).arg( <a href="tqnetworkprotocol.html#url">url</a>()->host() ) );
else
emit connectionStateChanged( ConClosed, tr( "Connection closed" ) );
}
void <a name="f293"></a>Nntp::readyRead()
{
// new data arrived on the command socket
// of we should read the list of available groups, let's do so
if ( readGroups ) {
parseGroups();
return;
}
// of we should read an article, let's do so
if ( readArticle ) {
parseArticle();
return;
}
// read the new data from the socket
<a href="tqcstring.html">TQCString</a> s;
<a name="x677"></a><a name="x668"></a> s.<a href="tqcstring.html#resize">resize</a>( commandSocket-><a href="tqsocket.html#bytesAvailable">bytesAvailable</a>() + 1 );
<a name="x685"></a><a name="x671"></a> commandSocket-><a href="tqsocket.html#readBlock">readBlock</a>( s.<a href="tqmemarray.html#data">data</a>(), commandSocket-><a href="tqsocket.html#bytesAvailable">bytesAvailable</a>() );
if ( !url() )
return;
// of the code of the server response was 200, we know that the
// server is ready to get commands from us now
<a name="x664"></a> if ( s.<a href="tqcstring.html#left">left</a>( 3 ) == "200" )
connectionReady = TRUE;
}
void <a name="f294"></a>Nntp::parseGroups()
{
<a name="x678"></a> if ( !commandSocket-><a href="tqsocket.html#canReadLine">canReadLine</a>() )
return;
// read one line after the other
while ( commandSocket-><a href="tqsocket.html#canReadLine">canReadLine</a>() ) {
<a name="x686"></a> <a href="tqstring.html">TQString</a> s = commandSocket-><a href="tqsocket.html#readLine">readLine</a>();
// if the line starts with a dot, all groups or articles have been listed,
// so we finished processing the listChildren() command
if ( s[ 0 ] == '.' ) {
readGroups = FALSE;
<a href="tqnetworkprotocol.html#operationInProgress">operationInProgress</a>()->setState( StDone );
emit finished( <a href="tqnetworkprotocol.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="tqcstring.html#left">left</a>( 3 ) == "215" || s.<a href="tqcstring.html#left">left</a>( 3 ) == "211" ) {
<a href="tqnetworkprotocol.html#operationInProgress">operationInProgress</a>()->setState( StInProgress );
emit start( <a href="tqnetworkprotocol.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="tqcstring.html#find">find</a>( '\t' ) != -1;
<a name="x666"></a> <a href="tqstring.html">TQString</a> group = s.<a href="tqcstring.html#mid">mid</a>( 0, s.<a href="tqcstring.html#find">find</a>( tab ? '\t' : ' ' ) );
<a href="tqurlinfo.html">TQUrlInfo</a> inf;
<a name="x700"></a> inf.<a href="tqurlinfo.html#setName">setName</a>( group );
<a href="tqstring.html">TQString</a> path = <a href="tqnetworkprotocol.html#url">url</a>()->path();
<a name="x698"></a> inf.<a href="tqurlinfo.html#setDir">setDir</a>( path.<a href="tqstring.html#isEmpty">isEmpty</a>() || path == "/" );
<a name="x702"></a> inf.<a href="tqurlinfo.html#setSymLink">setSymLink</a>( FALSE );
<a name="x699"></a><a name="x697"></a> inf.<a href="tqurlinfo.html#setFile">setFile</a>( !inf.<a href="tqurlinfo.html#isDir">isDir</a>() );
<a name="x703"></a> inf.<a href="tqurlinfo.html#setWritable">setWritable</a>( FALSE );
<a name="x701"></a> inf.<a href="tqurlinfo.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="tqsocket.html#canReadLine">canReadLine</a>() )
return;
// read an article one line after the other
while ( commandSocket-><a href="tqsocket.html#canReadLine">canReadLine</a>() ) {
<a href="tqstring.html">TQString</a> s = commandSocket-><a href="tqsocket.html#readLine">readLine</a>();
// if the line starts with a dot, we finished reading something
if ( s[ 0 ] == '.' ) {
readArticle = FALSE;
<a href="tqnetworkprotocol.html#operationInProgress">operationInProgress</a>()->setState( StDone );
emit finished( <a href="tqnetworkprotocol.html#operationInProgress">operationInProgress</a>() );
return;
}
<a name="x669"></a> if ( s.<a href="tqcstring.html#right">right</a>( 1 ) == "\n" )
<a name="x667"></a><a name="x665"></a> s.<a href="tqcstring.html#remove">remove</a>( s.<a href="tqcstring.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="tqstring.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="tqnetworkprotocol.html#operationInProgress">operationInProgress</a>() ) {
<a href="tqstring.html">TQString</a> msg = <a href="tqobject.html#tr">tr</a>( "Host not found or couldn't connect to: \n" + url()->host() );
<a href="tqnetworkprotocol.html#operationInProgress">operationInProgress</a>()->setState( StFailed );
<a href="tqnetworkprotocol.html#operationInProgress">operationInProgress</a>()->setProtocolDetail( msg );
<a href="tqnetworkprotocol.html#operationInProgress">operationInProgress</a>()->setErrorCode( (int)ErrHostNotFound );
<a href="tqnetworkprotocol.html#clearOperationQueue">clearOperationQueue</a>();
emit finished( <a href="tqnetworkprotocol.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>
|
