QTcpSocket

[Fallen_]

Hi, can someone help me with this code?
I don't know if it connects or anything it just doesnt write anything to the "QTextEdit* read"
mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H
 
#include <QDialog>
#include <QTcpSocket>
 
class QLineEdit;
class QLabel;
class QPushButton;
class QTextEdit;
 
class MainWindow : public QDialog
{
	Q_OBJECT
	public:
		MainWindow(QWidget* parent = 0);
 
	public slots:
		void Connect();
		void appendToWindow();
		void sendMessage();
 
	private:
		QLabel *ipLabel, *portLabel;
		QPushButton *done, *quit;
		QLineEdit *ipLine, *portLine, *write;
		QTcpSocket *socket;
		QTextEdit *read;
};
#endif

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QDialog>
#include <QTcpSocket>

class QLineEdit;
class QLabel;
class QPushButton;
class QTextEdit;

class MainWindow : public QDialog
{
	Q_OBJECT
	public:
		MainWindow(QWidget* parent = 0);

	public slots:
		void Connect();
		void appendToWindow();
		void sendMessage();

	private:
		QLabel *ipLabel, *portLabel;
		QPushButton *done, *quit;
		QLineEdit *ipLine, *portLine, *write;
		QTcpSocket *socket;
		QTextEdit *read;
};
#endif

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mainwindow.cpp

#include "mainwindow.h"
#include <QtGui>
#include <QtNetwork>
 
MainWindow::MainWindow(QWidget* parent)
	: QDialog(parent)
{
	socket = new QTcpSocket(this);
	ipLabel = new QLabel(tr("<i><font color=red>IP:</font></i>"));
	portLabel = new QLabel(tr("<i><font color=red>Port:</font></i>"));
	done = new QPushButton(tr("Connect"));
	quit = new QPushButton(tr("Quit"));
	ipLine = new QLineEdit;
	portLine = new QLineEdit;
	write = new QLineEdit;
	read = new QTextEdit;
 
	read->setReadOnly(true);
 
	QVBoxLayout* layout = new QVBoxLayout;
	layout->addWidget(ipLabel);
	layout->addWidget(ipLine);
	layout->addWidget(portLabel);
	layout->addWidget(portLine);
 
	QVBoxLayout* layout2 = new QVBoxLayout;
	layout2->addWidget(done);
	layout2->addWidget(quit);
 
	QVBoxLayout* layout3 = new QVBoxLayout;
	layout3->addWidget(write);
	layout3->addWidget(read);
 
	QHBoxLayout* mainLayout = new QHBoxLayout;
	mainLayout->addLayout(layout);
	mainLayout->addLayout(layout2);
	mainLayout->addLayout(layout3);
	setLayout(mainLayout);
 
	connect(done, SIGNAL(clicked()), this, SLOT(Connect()));
	connect(quit, SIGNAL(clicked()), this, SLOT(close()));
	connect(done, SIGNAL(clicked()), this, SLOT(appendToWindow()));
	connect(write, SIGNAL(textChanged(const QString&)), this, SLOT(sendMessage()));
}
 
void MainWindow::Connect()
{
	qint16 port;
	QString host;
	if(ipLine->text().isEmpty())
		return;
 
	if(portLine->text().isEmpty())
		port = 6667;
 
	host = ipLine->text();
	socket->connectToHost(host, port);
}
 
void MainWindow::appendToWindow()
{
	char buffer[1024];
	while(socket->canReadLine()) {
		socket->readLine(buffer, sizeof(buffer));
		read->append(buffer);
	}
}
 
void MainWindow::sendMessage()
{
	if(write->text().isEmpty())
		return;
 
	socket->write(write->text().toLatin1());
}

#include "mainwindow.h"
#include <QtGui>
#include <QtNetwork>

MainWindow::MainWindow(QWidget* parent)
	: QDialog(parent)
{
	socket = new QTcpSocket(this);
	ipLabel = new QLabel(tr("<i><font color=red>IP:</font></i>"));
	portLabel = new QLabel(tr("<i><font color=red>Port:</font></i>"));
	done = new QPushButton(tr("Connect"));
	quit = new QPushButton(tr("Quit"));
	ipLine = new QLineEdit;
	portLine = new QLineEdit;
	write = new QLineEdit;
	read = new QTextEdit;

	read->setReadOnly(true);

	QVBoxLayout* layout = new QVBoxLayout;
	layout->addWidget(ipLabel);
	layout->addWidget(ipLine);
	layout->addWidget(portLabel);
	layout->addWidget(portLine);

	QVBoxLayout* layout2 = new QVBoxLayout;
	layout2->addWidget(done);
	layout2->addWidget(quit);

	QVBoxLayout* layout3 = new QVBoxLayout;
	layout3->addWidget(write);
	layout3->addWidget(read);

	QHBoxLayout* mainLayout = new QHBoxLayout;
	mainLayout->addLayout(layout);
	mainLayout->addLayout(layout2);
	mainLayout->addLayout(layout3);
	setLayout(mainLayout);

	connect(done, SIGNAL(clicked()), this, SLOT(Connect()));
	connect(quit, SIGNAL(clicked()), this, SLOT(close()));
	connect(done, SIGNAL(clicked()), this, SLOT(appendToWindow()));
	connect(write, SIGNAL(textChanged(const QString&)), this, SLOT(sendMessage()));
}

void MainWindow::Connect()
{
	qint16 port;
	QString host;
	if(ipLine->text().isEmpty())
		return;

	if(portLine->text().isEmpty())
		port = 6667;

	host = ipLine->text();
	socket->connectToHost(host, port);
}

void MainWindow::appendToWindow()
{
	char buffer[1024];
	while(socket->canReadLine()) {
		socket->readLine(buffer, sizeof(buffer));
		read->append(buffer);
	}
}

void MainWindow::sendMessage()
{
	if(write->text().isEmpty())
		return;

	socket->write(write->text().toLatin1());
}

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main.cpp

#include "mainwindow.h"
#include <QApplication>
 
int main(int argc, char *argv[])
{
	QApplication a(argc, argv);
	MainWindow w;
	w.show();
	w.resize(200, 200);
	return a.exec();
}

#include "mainwindow.h"
#include <QApplication>

int main(int argc, char *argv[])
{
	QApplication a(argc, argv);
	MainWindow w;
	w.show();
	w.resize(200, 200);
	return a.exec();
}

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Any help is appreciated.

[hkaraoguz84]

Hi, can someone help me with this code?
I don't know if it connects or anything it just doesnt write anything to the "QTextEdit* read"
mainwindow.h

connect(write, SIGNAL(textChanged(const QString&)), this, SLOT(sendMessage()));
}

connect(write, SIGNAL(textChanged(const QString&)), this, SLOT(sendMessage()));
}

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Hi,

This part is problemmatic I guess. The signal and corresponding slot should have the same arguments. The connection should be like

connect(write, SIGNAL(textChanged(QString)), this, SLOT(sendMessage(QString)));

connect(write, SIGNAL(textChanged(QString)), this, SLOT(sendMessage(QString)));

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Your slot should be declared as

void sendMessage(const QString& dummy)

I hope this solves your problem.

[hkaraoguz84]

The reason you cannot type to "TextEdit* read" is

read->setReadOnly(true);

read->setReadOnly(true);

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if you change the argument to "false", you will be able to write in the "read".

[Fallen_]

Hi,

This part is problemmatic I guess. The signal and corresponding slot should have the same arguments. The connection should be like

connect(write, SIGNAL(textChanged(QString)), this, SLOT(sendMessage(QString)));

connect(write, SIGNAL(textChanged(QString)), this, SLOT(sendMessage(QString)));

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Your slot should be declared as

void sendMessage(const QString& dummy)

I hope this solves your problem.

my problem is that im not receiving anything from the socket & i need to be able to receive & send, this function:

void MainWindow::appendToWindow()
{
	char buffer[1024];
	while(socket->canReadLine()) {
		socket->readLine(buffer, sizeof(buffer));
		read->append(buffer);
	}
}

void MainWindow::appendToWindow()
{
	char buffer[1024];
	while(socket->canReadLine()) {
		socket->readLine(buffer, sizeof(buffer));
		read->append(buffer);
	}
}

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The reason you cannot type to "TextEdit* read" is


if you change the argument to "false", you will be able to write in the "read".

i don't want to write here, this text edit is for receiving data from the socket ;/
--
edit:
i made something like this:

if(socket->waitForConnected(-1) == true)
		read->append("Connected.");
	else
		read->append(socket->errorString());

if(socket->waitForConnected(-1) == true)
		read->append("Connected.");
	else
		read->append(socket->errorString());

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it gave me this:

Socket operation timed out

Socket operation timed out

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[Fallen_]

bump.........

[tbscope]

The textChanged signal is fired every time you press a key. This might not be the behaviour you want.

Use the readyRead() signal of the socket and connect it to your appendToWindow() slot.

By the way, if a socket times out, that's in most cases not a problem with your code.