client.cpp

一个客户端的通信程序

#include <qsocket.h>
#include <qtopia/qpeapplication.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)
{
  	QPEApplication app(argc,argv);
  	Client client(argc<2 ?"localhost":argv[1],1500);
  	app.setMainWidget(&client);
  	client.show();
  	return app.exec();

}

#include "client.moc"