source: trunk/doc/html/httpd-example.html

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2<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/examples/network/httpd/httpd.doc:5 -->
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6<title>A simple HTTP daemon</title>
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19 <a href="index.html">
20<font color="#004faf">Home</font></a>
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32<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 HTTP daemon</h1>
33
34
35<p>
36<p> This example shows how to use the <a href="qserversocket.html">QServerSocket</a> class. It is a very
37simple implementation of a HTTP daemon that listens on port 8080 and
38sends back a simple HTML page back for every GET request it gets. After
39sending the page, it closes the connection.
40<p> <hr>
41<p> Implementation (httpd.cpp):
42<p> <pre>/****************************************************************************
43** $Id: httpd-example.html 2051 2007-02-21 10:04:20Z chehrlic $
44**
45** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
46**
47** This file is part of an example program for Qt. This example
48** program may be used, distributed and modified without limitation.
49**
50*****************************************************************************/
51#include &lt;stdlib.h&gt;
52#include &lt;<a href="qsocket-h.html">qsocket.h</a>&gt;
53#include &lt;<a href="qregexp-h.html">qregexp.h</a>&gt;
54#include &lt;<a href="qserversocket-h.html">qserversocket.h</a>&gt;
55#include &lt;<a href="qapplication-h.html">qapplication.h</a>&gt;
56#include &lt;<a href="qmainwindow-h.html">qmainwindow.h</a>&gt;
57#include &lt;<a href="qtextstream-h.html">qtextstream.h</a>&gt;
58#include &lt;<a href="qvbox-h.html">qvbox.h</a>&gt;
59#include &lt;<a href="qlabel-h.html">qlabel.h</a>&gt;
60#include &lt;<a href="qtextview-h.html">qtextview.h</a>&gt;
61#include &lt;<a href="qpushbutton-h.html">qpushbutton.h</a>&gt;
62
63// HttpDaemon is the the class that implements the simple HTTP server.
64class HttpDaemon : public <a href="qserversocket.html">QServerSocket</a>
65{
66 <a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>
67public:
68 HttpDaemon( <a href="qobject.html">QObject</a>* parent=0 ) :
69 <a href="qserversocket.html">QServerSocket</a>(8080,1,parent)
70 {
71 if ( !ok() ) {
72 <a href="qapplication.html#qWarning">qWarning</a>("Failed to bind to port 8080");
73 exit( 1 );
74 }
75 }
76
77 void newConnection( int socket )
78 {
79 // When a new client connects, the server constructs a QSocket and all
80 // communication with the client is done over this QSocket. QSocket
81 // works asynchronouslyl, this means that all the communication is done
82 // in the two slots readClient() and discardClient().
83 <a href="qsocket.html">QSocket</a>* s = new <a href="qsocket.html">QSocket</a>( this );
84<a name="x731"></a> connect( s, SIGNAL(<a href="qsocket.html#readyRead">readyRead</a>()), this, SLOT(readClient()) );
85<a name="x729"></a> connect( s, SIGNAL(<a href="qsocket.html#delayedCloseFinished">delayedCloseFinished</a>()), this, SLOT(discardClient()) );
86<a name="x732"></a> s-&gt;<a href="qsocket.html#setSocket">setSocket</a>( socket );
87 emit newConnect();
88 }
89
90signals:
91 void newConnect();
92 void endConnect();
93 void wroteToClient();
94
95private slots:
96 void readClient()
97 {
98 // This slot is called when the client sent data to the server. The
99 // server looks if it was a get request and sends a very simple HTML
100 // document back.
101 <a href="qsocket.html">QSocket</a>* socket = (QSocket*)sender();
102<a name="x727"></a> if ( socket-&gt;<a href="qsocket.html#canReadLine">canReadLine</a>() ) {
103<a name="x733"></a><a name="x730"></a> <a href="qstringlist.html">QStringList</a> tokens = QStringList::<a href="qstringlist.html#split">split</a>( QRegExp("[ \r\n][ \r\n]*"), socket-&gt;<a href="qsocket.html#readLine">readLine</a>() );
104 if ( tokens[0] == "GET" ) {
105 <a href="qtextstream.html">QTextStream</a> os( socket );
106<a name="x735"></a> os.<a href="qtextstream.html#setEncoding">setEncoding</a>( QTextStream::UnicodeUTF8 );
107 os &lt;&lt; "HTTP/1.0 200 Ok\r\n"
108 "Content-Type: text/html; charset=\"utf-8\"\r\n"
109 "\r\n"
110 "&lt;h1&gt;Nothing to see here&lt;/h1&gt;\n";
111<a name="x728"></a> socket-&gt;<a href="qsocket.html#close">close</a>();
112 emit wroteToClient();
113 }
114 }
115 }
116 void discardClient()
117 {
118 <a href="qsocket.html">QSocket</a>* socket = (QSocket*)sender();
119 delete socket;
120 emit endConnect();
121 }
122};
123
124
125// HttpInfo provides a simple graphical user interface to the server and shows
126// the actions of the server.
127class HttpInfo : public <a href="qvbox.html">QVBox</a>
128{
129 Q_OBJECT
130public:
131 HttpInfo()
132 {
133 HttpDaemon *httpd = new HttpDaemon( this );
134
135 <a href="qstring.html">QString</a> itext = QString(
136 "This is a small httpd example.\n"
137 "You can connect with your\n"
138 "web browser to port %1"
139<a name="x726"></a> ).arg( httpd-&gt;<a href="qserversocket.html#port">port</a>() );
140 <a href="qlabel.html">QLabel</a> *lb = new <a href="qlabel.html">QLabel</a>( itext, this );
141 lb-&gt;<a href="qlabel.html#setAlignment">setAlignment</a>( AlignHCenter );
142 infoText = new <a href="qtextview.html">QTextView</a>( this );
143 <a href="qpushbutton.html">QPushButton</a> *quit = new <a href="qpushbutton.html">QPushButton</a>( "quit" , this );
144
145 connect( httpd, SIGNAL(newConnect()), SLOT(newConnect()) );
146 connect( httpd, SIGNAL(endConnect()), SLOT(endConnect()) );
147 connect( httpd, SIGNAL(wroteToClient()), SLOT(wroteToClient()) );
148<a name="x724"></a> connect( quit, SIGNAL(<a href="qbutton.html#pressed">pressed</a>()), qApp, SLOT(<a href="qapplication.html#quit">quit</a>()) );
149 }
150
151 ~HttpInfo()
152 {
153 }
154
155private slots:
156 void newConnect()
157 {
158<a name="x734"></a> infoText-&gt;<a href="qtextedit.html#append">append</a>( "New connection" );
159 }
160 void endConnect()
161 {
162 infoText-&gt;<a href="qtextedit.html#append">append</a>( "Connection closed\n\n" );
163 }
164 void wroteToClient()
165 {
166 infoText-&gt;<a href="qtextedit.html#append">append</a>( "Wrote to client" );
167 }
168
169private:
170 <a href="qtextview.html">QTextView</a> *infoText;
171};
172
173
174int main( int argc, char** argv )
175{
176 <a href="qapplication.html">QApplication</a> app( argc, argv );
177 HttpInfo info;
178 app.<a href="qapplication.html#setMainWidget">setMainWidget</a>( &amp;info );
179 info.<a href="qwidget.html#show">show</a>();
180 return app.<a href="qapplication.html#exec">exec</a>();
181}
182
183#include "httpd.moc"
184</pre>
185
186<p>See also <a href="network-examples.html">Network Examples</a>.
187
188<!-- eof -->
189<p><address><hr><div align=center>
190<table width=100% cellspacing=0 border=0><tr>
191<td>Copyright &copy; 2007
192<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
193<td align=right><div align=right>Qt 3.3.8</div>
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