gQt
26th February 2008, 12:45
Hi,
I have a problem with the readLine function. It doesn't work while the computer is connected to the server. I have checked that the computer is connected with the telnet command. I have modified the Fortune Client example, removed the readFortune-function and added a readLine() in the requestNewFortune function. The last function is renamed to read_data(). I have also added a waitforConnected if test and a canReadLine if test before the readLine() and after the connectToHost. The canReadLine fails for some reason. I have also tried to remove the canReadLine but the readLine doesn't read anything (the output of mystring is empty). The program consists of three files: client.cpp, client.h, main.cpp
Any suggestions appreciated, thanks!
Regards
gQt
client.cpp
#include <QtGui>
#include <QtNetwork>
#include "client.h"
#include <iostream.h>
#include <QtCore>
#include <qdebug.h>
Client::Client(QWidget *parent)
: QDialog(parent)
{
hostLabel = new QLabel(tr("&Server name:"));
portLabel = new QLabel(tr("S&erver port:"));
hostLineEdit = new QLineEdit("10.249.0.48");
portLineEdit = new QLineEdit("4007");
portLineEdit->setValidator(new QIntValidator(1, 65535, this));
hostLabel->setBuddy(hostLineEdit);
portLabel->setBuddy(portLineEdit);
statusLabel = new QLabel(tr("This examples requires that you run the "
"Fortune Server example as well."));
getFortuneButton = new QPushButton(tr("Get Fortune"));
getFortuneButton->setDefault(true);
getFortuneButton->setEnabled(false);
quitButton = new QPushButton(tr("Quit"));
tcpSocket = new QTcpSocket(this);
connect(hostLineEdit, SIGNAL(textChanged(const QString &)),
this, SLOT(enableGetFortuneButton()));
connect(portLineEdit, SIGNAL(textChanged(const QString &)),
this, SLOT(enableGetFortuneButton()));
connect(getFortuneButton, SIGNAL(clicked()),
this, SLOT(read_data()));
connect(quitButton, SIGNAL(clicked()), this, SLOT(close()));
connect(tcpSocket, SIGNAL(readyRead()), this, SLOT(read_data()));
connect(tcpSocket, SIGNAL(error(QAbstractSocket::SocketError)), this, SLOT(displayError(QAbstractSocket::SocketError)));
QHBoxLayout *buttonLayout = new QHBoxLayout;
buttonLayout->addStretch(1);
buttonLayout->addWidget(getFortuneButton);
buttonLayout->addWidget(quitButton);
QGridLayout *mainLayout = new QGridLayout;
mainLayout->addWidget(hostLabel, 0, 0);
mainLayout->addWidget(hostLineEdit, 0, 1);
mainLayout->addWidget(portLabel, 1, 0);
mainLayout->addWidget(portLineEdit, 1, 1);
mainLayout->addWidget(statusLabel, 2, 0, 1, 2);
mainLayout->addLayout(buttonLayout, 3, 0, 1, 2);
setLayout(mainLayout);
setWindowTitle(tr("Fortune Client"));
portLineEdit->setFocus();
}
void Client::read_data()
{
getFortuneButton->setEnabled(true);
tcpSocket->abort();
tcpSocket->connectToHost(hostLineEdit->text(),
portLineEdit->text().toInt());
cout << ("før if(canReadLine)\n");
if(tcpSocket->waitForConnected(-1))
{
cout <<"wait for connected loop";
if(tcpSocket->canReadLine())
{
tcpSocket->readLine();
qDebug() << "READ" << mystring;
cout <<"canReadLine loop";
}
statusLabel->setText(mystring);
getFortuneButton->setEnabled(false);
}
}
void Client::displayError(QAbstractSocket::SocketError socketError)
{
switch (socketError) {
case QAbstractSocket::RemoteHostClosedError:
break;
case QAbstractSocket::HostNotFoundError:
QMessageBox::information(this, tr("Fortune Client"),
tr("The host was not found. Please check the "
"host name and port settings."));
break;
case QAbstractSocket::ConnectionRefusedError:
QMessageBox::information(this, tr("Fortune Client"),
tr("The connection was refused by the peer. "
"Make sure the fortune server is running, "
"and check that the host name and port "
"settings are correct."));
break;
default:
QMessageBox::information(this, tr("Fortune Client"),
tr("The following error occurred: %1.")
.arg(tcpSocket->errorString()));
}
getFortuneButton->setEnabled(true);
}
void Client::enableGetFortuneButton()
{
getFortuneButton->setEnabled(!hostLineEdit->text().isEmpty()
&& !portLineEdit->text().isEmpty());
}
client.h
#ifndef CLIENT_H
#define CLIENT_H
#include <QDialog>
#include <QTcpSocket>
#include <QAbstractSocket>
class QDialogButtonBox;
class QLabel;
class QLineEdit;
class QPushButton;
class QTcpSocket;
class Client : public QDialog
{
Q_OBJECT
public:
Client(QWidget *parent = 0);
private slots:
void read_data();
void displayError(QAbstractSocket::SocketError socketError);
void enableGetFortuneButton();
private:
QLabel *hostLabel;
QLabel *portLabel;
QLabel *cLabel;
QLineEdit *hostLineEdit;
QLineEdit *portLineEdit;
QLabel *statusLabel;
QPushButton *getFortuneButton;
QPushButton *quitButton;
QDialogButtonBox *buttonBox;
QTcpSocket *tcpSocket;
QTcpSocket tcpSocket2;
QString currentFortune;
QString mystring;
quint16 blockSize;
};
#endif
main.cpp
#include <QApplication>
#include "client.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
Client client;
client.show();
return client.exec();
}
I have a problem with the readLine function. It doesn't work while the computer is connected to the server. I have checked that the computer is connected with the telnet command. I have modified the Fortune Client example, removed the readFortune-function and added a readLine() in the requestNewFortune function. The last function is renamed to read_data(). I have also added a waitforConnected if test and a canReadLine if test before the readLine() and after the connectToHost. The canReadLine fails for some reason. I have also tried to remove the canReadLine but the readLine doesn't read anything (the output of mystring is empty). The program consists of three files: client.cpp, client.h, main.cpp
Any suggestions appreciated, thanks!
Regards
gQt
client.cpp
#include <QtGui>
#include <QtNetwork>
#include "client.h"
#include <iostream.h>
#include <QtCore>
#include <qdebug.h>
Client::Client(QWidget *parent)
: QDialog(parent)
{
hostLabel = new QLabel(tr("&Server name:"));
portLabel = new QLabel(tr("S&erver port:"));
hostLineEdit = new QLineEdit("10.249.0.48");
portLineEdit = new QLineEdit("4007");
portLineEdit->setValidator(new QIntValidator(1, 65535, this));
hostLabel->setBuddy(hostLineEdit);
portLabel->setBuddy(portLineEdit);
statusLabel = new QLabel(tr("This examples requires that you run the "
"Fortune Server example as well."));
getFortuneButton = new QPushButton(tr("Get Fortune"));
getFortuneButton->setDefault(true);
getFortuneButton->setEnabled(false);
quitButton = new QPushButton(tr("Quit"));
tcpSocket = new QTcpSocket(this);
connect(hostLineEdit, SIGNAL(textChanged(const QString &)),
this, SLOT(enableGetFortuneButton()));
connect(portLineEdit, SIGNAL(textChanged(const QString &)),
this, SLOT(enableGetFortuneButton()));
connect(getFortuneButton, SIGNAL(clicked()),
this, SLOT(read_data()));
connect(quitButton, SIGNAL(clicked()), this, SLOT(close()));
connect(tcpSocket, SIGNAL(readyRead()), this, SLOT(read_data()));
connect(tcpSocket, SIGNAL(error(QAbstractSocket::SocketError)), this, SLOT(displayError(QAbstractSocket::SocketError)));
QHBoxLayout *buttonLayout = new QHBoxLayout;
buttonLayout->addStretch(1);
buttonLayout->addWidget(getFortuneButton);
buttonLayout->addWidget(quitButton);
QGridLayout *mainLayout = new QGridLayout;
mainLayout->addWidget(hostLabel, 0, 0);
mainLayout->addWidget(hostLineEdit, 0, 1);
mainLayout->addWidget(portLabel, 1, 0);
mainLayout->addWidget(portLineEdit, 1, 1);
mainLayout->addWidget(statusLabel, 2, 0, 1, 2);
mainLayout->addLayout(buttonLayout, 3, 0, 1, 2);
setLayout(mainLayout);
setWindowTitle(tr("Fortune Client"));
portLineEdit->setFocus();
}
void Client::read_data()
{
getFortuneButton->setEnabled(true);
tcpSocket->abort();
tcpSocket->connectToHost(hostLineEdit->text(),
portLineEdit->text().toInt());
cout << ("før if(canReadLine)\n");
if(tcpSocket->waitForConnected(-1))
{
cout <<"wait for connected loop";
if(tcpSocket->canReadLine())
{
tcpSocket->readLine();
qDebug() << "READ" << mystring;
cout <<"canReadLine loop";
}
statusLabel->setText(mystring);
getFortuneButton->setEnabled(false);
}
}
void Client::displayError(QAbstractSocket::SocketError socketError)
{
switch (socketError) {
case QAbstractSocket::RemoteHostClosedError:
break;
case QAbstractSocket::HostNotFoundError:
QMessageBox::information(this, tr("Fortune Client"),
tr("The host was not found. Please check the "
"host name and port settings."));
break;
case QAbstractSocket::ConnectionRefusedError:
QMessageBox::information(this, tr("Fortune Client"),
tr("The connection was refused by the peer. "
"Make sure the fortune server is running, "
"and check that the host name and port "
"settings are correct."));
break;
default:
QMessageBox::information(this, tr("Fortune Client"),
tr("The following error occurred: %1.")
.arg(tcpSocket->errorString()));
}
getFortuneButton->setEnabled(true);
}
void Client::enableGetFortuneButton()
{
getFortuneButton->setEnabled(!hostLineEdit->text().isEmpty()
&& !portLineEdit->text().isEmpty());
}
client.h
#ifndef CLIENT_H
#define CLIENT_H
#include <QDialog>
#include <QTcpSocket>
#include <QAbstractSocket>
class QDialogButtonBox;
class QLabel;
class QLineEdit;
class QPushButton;
class QTcpSocket;
class Client : public QDialog
{
Q_OBJECT
public:
Client(QWidget *parent = 0);
private slots:
void read_data();
void displayError(QAbstractSocket::SocketError socketError);
void enableGetFortuneButton();
private:
QLabel *hostLabel;
QLabel *portLabel;
QLabel *cLabel;
QLineEdit *hostLineEdit;
QLineEdit *portLineEdit;
QLabel *statusLabel;
QPushButton *getFortuneButton;
QPushButton *quitButton;
QDialogButtonBox *buttonBox;
QTcpSocket *tcpSocket;
QTcpSocket tcpSocket2;
QString currentFortune;
QString mystring;
quint16 blockSize;
};
#endif
main.cpp
#include <QApplication>
#include "client.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
Client client;
client.show();
return client.exec();
}