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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<title>A simple HTTP daemon</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 HTTP daemon</h1>
<p>
<p> This example shows how to use the <a href="qserversocket.html">QServerSocket</a> class. It is a very
simple implementation of a HTTP daemon that listens on port 8080 and
sends back a simple HTML page back for every GET request it gets. After
sending the page, it closes the connection.
<p> <hr>
<p> Implementation (httpd.cpp):
<p> <pre>/****************************************************************************
** $Id: qt/httpd.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 Qt. This example
** program may be used, distributed and modified without limitation.
**
*****************************************************************************/
#include <stdlib.h>
#include <<a href="qsocket-h.html">qsocket.h</a>>
#include <<a href="qregexp-h.html">qregexp.h</a>>
#include <<a href="qserversocket-h.html">qserversocket.h</a>>
#include <<a href="qapplication-h.html">qapplication.h</a>>
#include <<a href="qmainwindow-h.html">qmainwindow.h</a>>
#include <<a href="qtextstream-h.html">qtextstream.h</a>>
#include <<a href="qvbox-h.html">qvbox.h</a>>
#include <<a href="qlabel-h.html">qlabel.h</a>>
#include <<a href="qtextview-h.html">qtextview.h</a>>
#include <<a href="qpushbutton-h.html">qpushbutton.h</a>>
// HttpDaemon is the the class that implements the simple HTTP server.
class HttpDaemon : public <a href="qserversocket.html">QServerSocket</a>
{
<a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>
public:
HttpDaemon( <a href="qobject.html">QObject</a>* parent=0 ) :
<a href="qserversocket.html">QServerSocket</a>(8080,1,parent)
{
if ( !ok() ) {
<a href="qapplication.html#qWarning">qWarning</a>("Failed to bind to port 8080");
exit( 1 );
}
}
void newConnection( int socket )
{
// When a new client connects, the server constructs a QSocket and all
// communication with the client is done over this QSocket. QSocket
// works asynchronouslyl, this means that all the communication is done
// in the two slots readClient() and discardClient().
<a href="qsocket.html">QSocket</a>* s = new <a href="qsocket.html">QSocket</a>( this );
<a name="x731"></a> connect( s, SIGNAL(<a href="qsocket.html#readyRead">readyRead</a>()), this, SLOT(readClient()) );
<a name="x729"></a> connect( s, SIGNAL(<a href="qsocket.html#delayedCloseFinished">delayedCloseFinished</a>()), this, SLOT(discardClient()) );
<a name="x732"></a> s-><a href="qsocket.html#setSocket">setSocket</a>( socket );
emit newConnect();
}
signals:
void newConnect();
void endConnect();
void wroteToClient();
private slots:
void readClient()
{
// This slot is called when the client sent data to the server. The
// server looks if it was a get request and sends a very simple HTML
// document back.
<a href="qsocket.html">QSocket</a>* socket = (QSocket*)sender();
<a name="x727"></a> if ( socket-><a href="qsocket.html#canReadLine">canReadLine</a>() ) {
<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-><a href="qsocket.html#readLine">readLine</a>() );
if ( tokens[0] == "GET" ) {
<a href="qtextstream.html">QTextStream</a> os( socket );
<a name="x735"></a> os.<a href="qtextstream.html#setEncoding">setEncoding</a>( QTextStream::UnicodeUTF8 );
os << "HTTP/1.0 200 Ok\r\n"
"Content-Type: text/html; charset=\"utf-8\"\r\n"
"\r\n"
"<h1>Nothing to see here</h1>\n";
<a name="x728"></a> socket-><a href="qsocket.html#close">close</a>();
emit wroteToClient();
}
}
}
void discardClient()
{
<a href="qsocket.html">QSocket</a>* socket = (QSocket*)sender();
delete socket;
emit endConnect();
}
};
// HttpInfo provides a simple graphical user interface to the server and shows
// the actions of the server.
class HttpInfo : public <a href="qvbox.html">QVBox</a>
{
Q_OBJECT
public:
HttpInfo()
{
HttpDaemon *httpd = new HttpDaemon( this );
<a href="qstring.html">QString</a> itext = QString(
"This is a small httpd example.\n"
"You can connect with your\n"
"web browser to port %1"
<a name="x726"></a> ).arg( httpd-><a href="qserversocket.html#port">port</a>() );
<a href="qlabel.html">QLabel</a> *lb = new <a href="qlabel.html">QLabel</a>( itext, this );
lb-><a href="qlabel.html#setAlignment">setAlignment</a>( AlignHCenter );
infoText = new <a href="qtextview.html">QTextView</a>( this );
<a href="qpushbutton.html">QPushButton</a> *quit = new <a href="qpushbutton.html">QPushButton</a>( "quit" , this );
connect( httpd, SIGNAL(newConnect()), SLOT(newConnect()) );
connect( httpd, SIGNAL(endConnect()), SLOT(endConnect()) );
connect( httpd, SIGNAL(wroteToClient()), SLOT(wroteToClient()) );
<a name="x724"></a> connect( quit, SIGNAL(<a href="qbutton.html#pressed">pressed</a>()), qApp, SLOT(<a href="qapplication.html#quit">quit</a>()) );
}
~HttpInfo()
{
}
private slots:
void newConnect()
{
<a name="x734"></a> infoText-><a href="qtextedit.html#append">append</a>( "New connection" );
}
void endConnect()
{
infoText-><a href="qtextedit.html#append">append</a>( "Connection closed\n\n" );
}
void wroteToClient()
{
infoText-><a href="qtextedit.html#append">append</a>( "Wrote to client" );
}
private:
<a href="qtextview.html">QTextView</a> *infoText;
};
int main( int argc, char** argv )
{
<a href="qapplication.html">QApplication</a> app( argc, argv );
HttpInfo info;
app.<a href="qapplication.html#setMainWidget">setMainWidget</a>( &info );
info.<a href="qwidget.html#show">show</a>();
return app.<a href="qapplication.html#exec">exec</a>();
}
#include "httpd.moc"
</pre>
<p>See also <a href="network-examples.html">Network Examples</a>.
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