client_example.cpp

基于qt2.3.7的客户端网络程序

#include <qsocket.h>

#include <qapplication.h>
#include <qvbox.h>
#include <qtextview.h>
#include <qhbox.h>
#include <qlabel.h>
#include <qlineedit.h>
#include <qpushbutton.h>
#include <qtextstream.h>


class Client : public QVBox
{
     Q_OBJECT

  public :
     Client( const QString &host, Q_UINT16 port )
     {
	infoText = new QTextView( this );
        
        QHBox *hb = new QHBox( this );

        inputText = new QLineEdit( hb );
 
        QPushButton *send = new QPushButton ( tr( "Send" ), hb);
	QPushButton *close = new QPushButton ( tr( "Close connection" ), this);
	QPushButton *quit = new QPushButton ( tr( "Quit" ), this);

	connect( send, SIGNAL( clicked() ), SLOT( sendToServer() ) );
	connect( close, SIGNAL( clicked() ), SLOT( closeConnection() ) );
	connect( quit, SIGNAL( clicked() ), qApp, SLOT( quit() ) );

	socket = new QSocket( this );
        connect( socket, SIGNAL( connected() ), SLOT( socketConnected() ) );
	connect( socket, SIGNAL( connectionClosed() ), SLOT( socketConnectionClosed() ) );
	connect( socket, SIGNAL( readyRead() ), SLOT( socketReadyRead() ) );
	connect( socket, SIGNAL( error( int ) ), SLOT( socketError( int ) ) );

        infoText->append( tr( "Trying to connect to the Server\n" ) );
        socket->connectToHost( host, port ) ;

     }

     ~Client()
     {

     }

  private slots:
     
     void closeConnection()
     {
	socket->close();
	if( socket->state() == QSocket::Closing )
        {
	   connect( socket, SIGNAL(delayedCloseFinished()), SLOT( socketClosed() ) );

        }
	else
	{
	   socketClosed();
	}

     }

     void sendToServer()
     {
	QTextStream os( socket );
        os << inputText->text() << "\n" ;
	inputText->setText( "" );

     }

     void socketReadyRead()
     {
        while( socket->canReadLine() )
        {
           infoText->append( socket->readLine() );
        }

     }

     void socketConnected()
     {
	infoText->append( tr( "Connected to Server\n") );

     }

     void socketConnectionClosed()
     {
	infoText->append( tr( "Connection closed by the Server\n") );
     }

     void socketClosed()
     {
	infoText->append( tr( "Connection closed\n") );
     }

     void socketError( int e )
     {
	infoText->append( tr( "Error number %l occured\n").arg(e) );
     }

  private:
     QSocket *socket;
     QTextView *infoText;
     QLineEdit *inputText;

};

int main( int argc, char **argv )
{
      QApplication app( argc, argv );
      Client client( argc<2 ? "localhost" : argv[1], 4242);
      app.setMainWidget( &client );
      client.show();
      return app.exec();

}
#include "Client_example.moc"