socket.cpp

关于linux下基于QT界面socket编程的简单实例

#include "socket.h"

Dialog::Dialog( QWidget* parent, const char* name, bool modal, WFlags fl )
    : QDialog( parent, name, modal, fl )

{
    if ( !name )
	setName( "Dialog" );

    ipAddressLineEdit = new QLineEdit( this, "ipAddressLineEdit" );
    ipAddressLineEdit->setGeometry( QRect( 100, 10, 160, 41 ) );

    connectButton = new QPushButton( this, "connectButton" );
    connectButton->setGeometry( QRect( 410, 10, 120, 51 ) );
    connectButton->setFocusPolicy( QPushButton::NoFocus );

    exitButton = new QPushButton( this, "exitButton" );
    exitButton->setGeometry( QRect( 400, 360, 131, 61 ) );
    exitButton->setFocusPolicy( QPushButton::NoFocus );

    textEdit= new QTextEdit( this, "textEdit" );
    textEdit->setGeometry( QRect( 40, 170, 321, 221 ) );

    disconnectButton = new QPushButton( this, "disconnectButton" );
    disconnectButton->setGeometry( QRect( 540, 10, 121, 50 ) );
    disconnectButton->setFocusPolicy( QPushButton::NoFocus );

    portLineEdit = new QLineEdit( this, "portLineEdit" );
    portLineEdit->setGeometry( QRect( 310, 10, 91, 41 ) );

    portLabel = new QLabel( this, "portLabel" );
    portLabel->setGeometry( QRect( 270, 10, 29, 41 ) );

    ipAddressLabel = new QLabel( this, "ipAddressLabel" );
    ipAddressLabel->setGeometry( QRect( 20, 10, 70, 41 ) );

    writeLabel = new QLabel( this, "writeLabel" );
    writeLabel->setGeometry( QRect( 20, 90, 91, 41 ) );

    writeLineEdit = new QLineEdit( this, "writeLineEdit" );
    writeLineEdit->setGeometry( QRect( 121, 90, 260, 41 ) );

    goButton = new QPushButton( this, "goButton" );
    goButton->setGeometry( QRect( 400, 90, 101, 41 ) );
    languageChange();
    resize( QSize(640, 444).expandedTo(minimumSizeHint()) );
    
    socket=new QSocket(this,"socket");
    connect(socket,SIGNAL(readyRead()),this,SLOT(socketReadData()));
    connect(socket,SIGNAL(connected()),this,SLOT(socketConnectedOK()));
    connect(socket,SIGNAL(connectionClosed()),this,SLOT(socketClosed()));

    connect( connectButton, SIGNAL( clicked() ), this, SLOT( connectSlot() ) );
    connect( disconnectButton, SIGNAL( clicked() ), this, SLOT( disconnectSlot() ) );
    connect( exitButton, SIGNAL( clicked() ), this, SLOT( exitSlot() ) );
    connect( goButton, SIGNAL( clicked() ), this, SLOT( sendData() ) );
}
Dialog::~Dialog()
{
    socket->close();
}

void Dialog::languageChange()
{
    setCaption( tr( "Form1" ) );
    connectButton->setText( tr( "Connect to Host" ) );
    exitButton->setText( tr( "Exit Program" ) );
    disconnectButton->setText( tr( "Disconnect" ) );
    portLabel->setText( tr( "port:" ) );
    ipAddressLabel->setText( tr( "IP address:" ) );
    writeLabel->setText( tr( "Write To Socket:" ) );
    writeLineEdit->setText( tr( "O,yes~~~" ) );
    goButton->setText( tr( "GO" ) );
}
void Dialog::connectSlot()
{
    if(ipAddressLineEdit->text().isEmpty())return;
    if(portLineEdit->text().isEmpty())return;
    QString ipAddress=ipAddressLineEdit->text().stripWhiteSpace();
    QString portString=portLineEdit->text().stripWhiteSpace();
    QHostAddress hostAddress;
    if(!hostAddress.setAddress(ipAddress))
	return;
    bool b;
    int port=portString.toInt(&b);
    if(!b)return;
    socket->connectToHost(ipAddress,port);
}
void Dialog::disconnectSlot()
{
    textEdit->append(QString("socket's state is:")+QString::number(socket->state()));
    socket->close();
}
void Dialog::exitSlot()
{
    socket->close();
    emit quit();
}
void Dialog::sendData()
{   
	int i=0;
    int k=0;
    if( socket->state()!=QSocket::Connection)
		return;
	QString newfile = QFileDialog::getOpenFileName();
	QFile f(newfile);
	f.open(IO_ReadWrite);
	int p=f.size();
	QDataStream s(&f);
	QString str;
	s>>str;
	while(i<p)
	{
		if(k=socket->writeBlock(str,500)>=0)
			i+=k;
	}
}
void Dialog::socketReadData()
{
    char *netin="in.jp2";
	do
	{
	socket->readBlock(netin,socket->bytesAvailable() );
    }while(socket->atEnd()==TRUE)

}
void Dialog::socketConnectedOK()
{
    textEdit->append("socket connected OK!\n");
}
void Dialog::socketClosed()
{
    textEdit->append("socket connection closed!\n");
}