<!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/httpd/httpd.doc:5 --> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>A simple HTTP daemon</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 HTTP daemon</h1> <p> <p> This example shows how to use the <a href="ntqserversocket.html">TQServerSocket</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 TQt. This example ** program may be used, distributed and modified without limitation. ** *****************************************************************************/ #include <stdlib.h> #include <<a href="qsocket-h.html">ntqsocket.h</a>> #include <<a href="qregexp-h.html">ntqregexp.h</a>> #include <<a href="qserversocket-h.html">ntqserversocket.h</a>> #include <<a href="qapplication-h.html">ntqapplication.h</a>> #include <<a href="qmainwindow-h.html">ntqmainwindow.h</a>> #include <<a href="qtextstream-h.html">ntqtextstream.h</a>> #include <<a href="qvbox-h.html">ntqvbox.h</a>> #include <<a href="qlabel-h.html">ntqlabel.h</a>> #include <<a href="qtextview-h.html">ntqtextview.h</a>> #include <<a href="qpushbutton-h.html">ntqpushbutton.h</a>> // HttpDaemon is the the class that implements the simple HTTP server. class HttpDaemon : public <a href="ntqserversocket.html">TQServerSocket</a> { <a href="metaobjects.html#TQ_OBJECT">TQ_OBJECT</a> public: HttpDaemon( <a href="ntqobject.html">TQObject</a>* parent=0 ) : <a href="ntqserversocket.html">TQServerSocket</a>(8080,1,parent) { if ( !ok() ) { <a href="ntqapplication.html#qWarning">tqWarning</a>("Failed to bind to port 8080"); exit( 1 ); } } void newConnection( int socket ) { // When a new client connects, the server constructs a TQSocket and all // communication with the client is done over this TQSocket. TQSocket // works asynchronouslyl, this means that all the communication is done // in the two slots readClient() and discardClient(). <a href="ntqsocket.html">TQSocket</a>* s = new <a href="ntqsocket.html">TQSocket</a>( this ); <a name="x731"></a> connect( s, SIGNAL(<a href="ntqsocket.html#readyRead">readyRead</a>()), this, SLOT(readClient()) ); <a name="x729"></a> connect( s, SIGNAL(<a href="ntqsocket.html#delayedCloseFinished">delayedCloseFinished</a>()), this, SLOT(discardClient()) ); <a name="x732"></a> s-><a href="ntqsocket.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="ntqsocket.html">TQSocket</a>* socket = (TQSocket*)sender(); <a name="x727"></a> if ( socket-><a href="ntqsocket.html#canReadLine">canReadLine</a>() ) { <a name="x733"></a><a name="x730"></a> <a href="ntqstringlist.html">TQStringList</a> tokens = TQStringList::<a href="ntqstringlist.html#split">split</a>( TQRegExp("[ \r\n][ \r\n]*"), socket-><a href="ntqsocket.html#readLine">readLine</a>() ); if ( tokens[0] == "GET" ) { <a href="ntqtextstream.html">TQTextStream</a> os( socket ); <a name="x735"></a> os.<a href="ntqtextstream.html#setEncoding">setEncoding</a>( TQTextStream::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="ntqsocket.html#close">close</a>(); emit wroteToClient(); } } } void discardClient() { <a href="ntqsocket.html">TQSocket</a>* socket = (TQSocket*)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="ntqvbox.html">TQVBox</a> { TQ_OBJECT public: HttpInfo() { HttpDaemon *httpd = new HttpDaemon( this ); <a href="ntqstring.html">TQString</a> itext = TQString( "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="ntqserversocket.html#port">port</a>() ); <a href="ntqlabel.html">TQLabel</a> *lb = new <a href="ntqlabel.html">TQLabel</a>( itext, this ); lb-><a href="ntqlabel.html#setAlignment">setAlignment</a>( AlignHCenter ); infoText = new <a href="ntqtextview.html">TQTextView</a>( this ); <a href="ntqpushbutton.html">TQPushButton</a> *quit = new <a href="ntqpushbutton.html">TQPushButton</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="ntqbutton.html#pressed">pressed</a>()), tqApp, SLOT(<a href="ntqapplication.html#quit">quit</a>()) ); } ~HttpInfo() { } private slots: void newConnect() { <a name="x734"></a> infoText-><a href="ntqtextedit.html#append">append</a>( "New connection" ); } void endConnect() { infoText-><a href="ntqtextedit.html#append">append</a>( "Connection closed\n\n" ); } void wroteToClient() { infoText-><a href="ntqtextedit.html#append">append</a>( "Wrote to client" ); } private: <a href="ntqtextview.html">TQTextView</a> *infoText; }; int main( int argc, char** argv ) { <a href="ntqapplication.html">TQApplication</a> app( argc, argv ); HttpInfo info; app.<a href="ntqapplication.html#setMainWidget">setMainWidget</a>( &info ); info.<a href="ntqwidget.html#show">show</a>(); return app.<a href="ntqapplication.html#exec">exec</a>(); } #include "httpd.moc" </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>