/****************************************************************************** $Id: qt/server.cpp   3.1.1   edited Nov 8 10:35 $**** 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 <qsocket.h>#include <qserversocket.h>#include <qapplication.h>#include <qvbox.h>#include <qtextview.h>#include <qlabel.h>#include <qpushbutton.h>#include <qtextstream.h>#include <stdlib.h>/*  The ClientSocket class provides a socket that is connected with a client.  For every client that connects to the server, the server creates a new  instance of this class.*/class ClientSocket : public QSocket{    Q_OBJECTpublic:    ClientSocket( int sock, QObject *parent=0, const char *name=0 ) :	QSocket( parent, name )    {	line = 0;	connect( this, SIGNAL(readyRead()),		SLOT(readClient()) );	connect( this, SIGNAL(connectionClosed()),		SLOT(deleteLater()) );	setSocket( sock );    }    ~ClientSocket()    {    }signals:    void logText( const QString& );private slots:    void readClient()    {	QTextStream ts( this );	while ( canReadLine() ) {	    QString str = ts.readLine();	    emit logText( tr("Read: '%1'\n").arg(str) );	    ts << line << ": " << str << endl;	    emit logText( tr("Wrote: '%1: %2'\n").arg(line).arg(str) );	    line++;	}    }private:    int line;};/*  The SimpleServer class handles new connections to the server. For every  client that connects, it creates a new ClientSocket -- that instance is now  responsible for the communication with that client.*/class SimpleServer : public QServerSocket{    Q_OBJECTpublic:    SimpleServer( QObject* parent=0 ) :	QServerSocket( 4242, 1, parent )    {	if ( !ok() ) {	    qWarning("Failed to bind to port 4242");	    exit(1);	}    }    ~SimpleServer()    {    }    void newConnection( int socket )    {	ClientSocket *s = new ClientSocket( socket, this );	emit newConnect( s );    }signals:    void newConnect( ClientSocket* );};/*  The ServerInfo class provides a small GUI for the server. It also creates the  SimpleServer and as a result the server.*/class ServerInfo : public QVBox{    Q_OBJECTpublic:    ServerInfo()    {	SimpleServer *server = new SimpleServer( this );	QString itext = tr(		"This is a small server example.\n"		"Connect with the client now."		);	QLabel *lb = new QLabel( itext, this );	lb->setAlignment( AlignHCenter );	infoText = new QTextView( this );	QPushButton *quit = new QPushButton( tr("Quit") , this );	connect( server, SIGNAL(newConnect(ClientSocket*)),		SLOT(newConnect(ClientSocket*)) );	connect( quit, SIGNAL(clicked()), qApp,		SLOT(quit()) );    }    ~ServerInfo()    {    }private slots:    void newConnect( ClientSocket *s )    {	infoText->append( tr("New connection\n") );	connect( s, SIGNAL(logText(const QString&)),		infoText, SLOT(append(const QString&)) );	connect( s, SIGNAL(connectionClosed()),		SLOT(connectionClosed()) );    }    void connectionClosed()    {	infoText->append( tr("Client closed connection\n") );    }private:    QTextView *infoText;};int main( int argc, char** argv ){    QApplication app( argc, argv );    ServerInfo info;    app.setMainWidget( &info );    info.show();    return app.exec();}#include "server.moc"