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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>
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<p>
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<p> This example shows how to use the <a href="tqserversocket.html">TQServerSocket</a> class. It is a very
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simple implementation of a HTTP daemon that listens on port 8080 and
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sends back a simple HTML page back for every GET request it gets. After
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sending the page, it closes the connection.
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<p> <hr>
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<p> Implementation (httpd.cpp):
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<p> <pre>/****************************************************************************
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** $Id: qt/httpd.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 <stdlib.h>
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#include <<a href="tqsocket-h.html">tqsocket.h</a>>
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#include <<a href="tqregexp-h.html">tqregexp.h</a>>
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#include <<a href="tqserversocket-h.html">tqserversocket.h</a>>
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#include <<a href="qapplication-h.html">ntqapplication.h</a>>
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#include <<a href="tqmainwindow-h.html">tqmainwindow.h</a>>
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#include <<a href="tqtextstream-h.html">tqtextstream.h</a>>
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#include <<a href="tqvbox-h.html">tqvbox.h</a>>
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#include <<a href="tqlabel-h.html">tqlabel.h</a>>
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#include <<a href="tqtextview-h.html">tqtextview.h</a>>
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#include <<a href="tqpushbutton-h.html">tqpushbutton.h</a>>
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// HttpDaemon is the the class that implements the simple HTTP server.
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class HttpDaemon : public <a href="tqserversocket.html">TQServerSocket</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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HttpDaemon( <a href="tqobject.html">TQObject</a>* parent=0 ) :
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<a href="tqserversocket.html">TQServerSocket</a>(8080,1,parent)
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{
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if ( !ok() ) {
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<a href="ntqapplication.html#qWarning">tqWarning</a>("Failed to bind to port 8080");
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exit( 1 );
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}
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}
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void newConnection( int socket )
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{
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// When a new client connects, the server constructs a TQSocket and all
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// communication with the client is done over this TQSocket. TQSocket
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// works asynchronouslyl, this means that all the communication is done
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// in the two slots readClient() and discardClient().
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<a href="tqsocket.html">TQSocket</a>* s = new <a href="tqsocket.html">TQSocket</a>( this );
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<a name="x731"></a> connect( s, TQ_SIGNAL(<a href="tqsocket.html#readyRead">readyRead</a>()), this, TQ_SLOT(readClient()) );
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<a name="x729"></a> connect( s, TQ_SIGNAL(<a href="tqsocket.html#delayedCloseFinished">delayedCloseFinished</a>()), this, TQ_SLOT(discardClient()) );
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<a name="x732"></a> s-><a href="tqsocket.html#setSocket">setSocket</a>( socket );
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emit newConnect();
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}
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signals:
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void newConnect();
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void endConnect();
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void wroteToClient();
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private slots:
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void readClient()
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{
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// This slot is called when the client sent data to the server. The
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// server looks if it was a get request and sends a very simple HTML
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// document back.
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<a href="tqsocket.html">TQSocket</a>* socket = (TQSocket*)sender();
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<a name="x727"></a> if ( socket-><a href="tqsocket.html#canReadLine">canReadLine</a>() ) {
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<a name="x733"></a><a name="x730"></a> <a href="tqstringlist.html">TQStringList</a> tokens = TQStringList::<a href="tqstringlist.html#split">split</a>( TQRegExp("[ \r\n][ \r\n]*"), socket-><a href="tqsocket.html#readLine">readLine</a>() );
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if ( tokens[0] == "GET" ) {
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<a href="tqtextstream.html">TQTextStream</a> os( socket );
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<a name="x735"></a> os.<a href="tqtextstream.html#setEncoding">setEncoding</a>( TQTextStream::UnicodeUTF8 );
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os << "HTTP/1.0 200 Ok\r\n"
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"Content-Type: text/html; charset=\"utf-8\"\r\n"
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"\r\n"
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"<h1>Nothing to see here</h1>\n";
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<a name="x728"></a> socket-><a href="tqsocket.html#close">close</a>();
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emit wroteToClient();
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}
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}
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}
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void discardClient()
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{
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<a href="tqsocket.html">TQSocket</a>* socket = (TQSocket*)sender();
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delete socket;
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emit endConnect();
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}
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};
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// HttpInfo provides a simple graphical user interface to the server and shows
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// the actions of the server.
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class HttpInfo : public <a href="tqvbox.html">TQVBox</a>
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{
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TQ_OBJECT
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public:
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HttpInfo()
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{
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HttpDaemon *httpd = new HttpDaemon( this );
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<a href="tqstring.html">TQString</a> itext = TQString(
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"This is a small httpd example.\n"
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"You can connect with your\n"
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"web browser to port %1"
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<a name="x726"></a> ).arg( httpd-><a href="tqserversocket.html#port">port</a>() );
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<a href="tqlabel.html">TQLabel</a> *lb = new <a href="tqlabel.html">TQLabel</a>( itext, this );
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lb-><a href="tqlabel.html#setAlignment">setAlignment</a>( AlignHCenter );
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infoText = new <a href="tqtextview.html">TQTextView</a>( this );
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<a href="tqpushbutton.html">TQPushButton</a> *quit = new <a href="tqpushbutton.html">TQPushButton</a>( "quit" , this );
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connect( httpd, TQ_SIGNAL(newConnect()), TQ_SLOT(newConnect()) );
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connect( httpd, TQ_SIGNAL(endConnect()), TQ_SLOT(endConnect()) );
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connect( httpd, TQ_SIGNAL(wroteToClient()), TQ_SLOT(wroteToClient()) );
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<a name="x724"></a> connect( quit, TQ_SIGNAL(<a href="tqbutton.html#pressed">pressed</a>()), tqApp, TQ_SLOT(<a href="ntqapplication.html#quit">quit</a>()) );
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}
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~HttpInfo()
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{
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}
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private slots:
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void newConnect()
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{
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<a name="x734"></a> infoText-><a href="tqtextedit.html#append">append</a>( "New connection" );
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}
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void endConnect()
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{
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infoText-><a href="tqtextedit.html#append">append</a>( "Connection closed\n\n" );
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}
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void wroteToClient()
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{
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infoText-><a href="tqtextedit.html#append">append</a>( "Wrote to client" );
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}
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private:
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<a href="tqtextview.html">TQTextView</a> *infoText;
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};
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int main( int argc, char** argv )
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{
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<a href="ntqapplication.html">TQApplication</a> app( argc, argv );
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HttpInfo info;
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app.<a href="ntqapplication.html#setMainWidget">setMainWidget</a>( &info );
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info.<a href="tqwidget.html#show">show</a>();
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return app.<a href="ntqapplication.html#exec">exec</a>();
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}
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#include "httpd.moc"
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</pre>
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<p>See also <a href="network-examples.html">Network Examples</a>.
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<table width=100% cellspacing=0 border=0><tr>
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<td>Copyright © 2007
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<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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<td align=right><div align=right>TQt 3.3.8</div>
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</table></div></address></body>
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