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This example shows how to use the QServerSocket 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 it sent the page, it closes the connection.
Implementation (httpd.cpp):
/****************************************************************************
** $Id: qt/httpd.cpp 3.0.0-beta1-beta1 edited Nov 28 23:17 $
**
** Copyright (C) 1992-2000 Trolltech AS. 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 <qsocket.h>
#include <qregexp.h>
#include <qserversocket.h>
#include <qapplication.h>
#include <qmainwindow.h>
#include <qtextstream.h>
#include <qvbox.h>
#include <qlabel.h>
#include <qtextview.h>
#include <qpushbutton.h>
class HttpDaemon : public QServerSocket
{
Q_OBJECT
public:
HttpDaemon( QObject* parent=0 ) :
QServerSocket(8080,0,parent)
{
if ( !ok() ) {
qWarning("Failed to bind to port 8080");
exit(1);
}
}
void newConnection( int socket )
{
QSocket* s = new QSocket(this);
connect(s,SIGNAL(readyRead()),this,SLOT(readClient()));
connect(s,SIGNAL(delayedCloseFinished()),this,SLOT(discardClient()));
s->setSocket(socket);
emit newConnect();
}
signals:
void newConnect();
void endConnect();
void wroteToClient();
private slots:
void readClient()
{
QSocket* socket = (QSocket*)sender();
if (socket->canReadLine()) {
QStringList tokens = QStringList::split(QRegExp("[ \n\r][ \n\r]*"),socket->readLine());
if ( tokens[0] == "GET" ) {
QTextStream os(socket);
os << "<h1>Nothing to see here</h1>\n";
socket->close();
emit wroteToClient();
}
}
}
void discardClient()
{
QSocket* socket = (QSocket*)sender();
delete socket;
emit endConnect();
}
};
class HttpInfo : public QVBox
{
Q_OBJECT
public:
HttpInfo()
{
HttpDaemon *httpd = new HttpDaemon( this );
QString itext = QString(
"This is a small httpd example.\n"
"You can connect with your\n"
"web browser to port %1"
).arg( httpd->port() );
QLabel *lb = new QLabel( itext, this );
lb->setAlignment( AlignHCenter );
infoText = new QTextView( this );
QPushButton *quit = new QPushButton( "quit" , this );
connect( httpd, SIGNAL(newConnect()), SLOT(newConnect()) );
connect( httpd, SIGNAL(endConnect()), SLOT(endConnect()) );
connect( httpd, SIGNAL(wroteToClient()), SLOT(wroteToClient()) );
connect( quit, SIGNAL(pressed()), qApp, SLOT(quit()) );
}
~HttpInfo()
{
}
private slots:
void newConnect()
{
infoText->append( "New connection" );
}
void endConnect()
{
infoText->append( "Connection closed" );
}
void wroteToClient()
{
infoText->append( "Wrote to client" );
}
private:
QTextView *infoText;
};
int main( int argc, char** argv )
{
QApplication app( argc, argv );
HttpInfo info;
app.setMainWidget( &info );
info.show();
return app.exec();
}
#include "httpd.moc"
| Copyright © 2000 Trolltech | Trademarks | Qt version main-beta1
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