source: trunk/examples/network/clientserver/server/server.cpp

/****************************************************************************
** $Id: server.cpp 2 2005-11-16 15:49:26Z dmik $
**
** 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_OBJECT
public:
    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_OBJECT
public:
    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_OBJECT
public:
    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"