client.cpp

基于linux平台

#include <qsocket.h>
#include <qapplication.h>
#include <qvbox.h>
#include <qhbox.h>
#include <qtextview.h>
#include <qlineedit.h>
#include <qlabel.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("Tring 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 occurred\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.moc"