Object::connect: No such slot ThreadDialog::closeEvent(event)

[ashukla]

Dear Sir!
In this code application is running but give this messge...
Object::connect: No such slot ThreadDialog::closeEvent(event)

/*t.h file*/
#ifndef T_H
#define T_H
#include <QtGui>
class MyThread : public QThread
{
    Q_OBJECT
public:
    MyThread(QObject *parent=0);
    void setMessage(const QString &message);
    void stop();
protected:
    void run();
private:
    QString msg;
    volatile bool stopped;
};
 
class ThreadDialog : public QDialog
{
    Q_OBJECT
public:
    ThreadDialog(QApplication *app,QWidget *parent = 0);
protected:
    void closeEvent(QCloseEvent *event);
private slots:
    void startOrStopThreadA();
    void startOrStopThreadB();
private:
    MyThread threadA;
    MyThread threadB;
    QPushButton *threadAButton;
    QPushButton *threadBButton;
    QPushButton *quitButton;
};
#endif

/*t.h file*/
#ifndef T_H
#define T_H
#include <QtGui>
class MyThread : public QThread
{
    Q_OBJECT
public:
    MyThread(QObject *parent=0);
    void setMessage(const QString &message);
    void stop();
protected:
    void run();
private:
    QString msg;
    volatile bool stopped;
};

class ThreadDialog : public QDialog
{
    Q_OBJECT
public:
    ThreadDialog(QApplication *app,QWidget *parent = 0);
protected:
    void closeEvent(QCloseEvent *event);
private slots:
    void startOrStopThreadA();
    void startOrStopThreadB();
private:
    MyThread threadA;
    MyThread threadB;
    QPushButton *threadAButton;
    QPushButton *threadBButton;
    QPushButton *quitButton;
};
#endif

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/*t.cpp*/
#include <iostream.h>
#include <t.h>
#include <QString>
int i=0;
 
MyThread::MyThread(QObject *parent)
: QThread(parent)
{
	stopped = false;
}
 
void MyThread::run()
{
 
 
while (!stopped)
{
        cerr << qPrintable(msg)<< endl;
	//msleep(500);
 }   
stopped=false;
}
 
 
void MyThread::stop()
{
    stopped = true;
}
void MyThread::setMessage(const QString &message)
{
	msg=message;
	//run();
}
 
ThreadDialog::ThreadDialog(QApplication *app,QWidget *parent)
    : QDialog(parent)
{
    threadA.setMessage("Anurag");
    threadB.setMessage("Sonu");
    threadAButton = new QPushButton(tr("Start A"),this);
    threadBButton = new QPushButton(tr("Start B"),this);
    quitButton = new QPushButton(tr("Quit"),this);
	QHBoxLayout *layout=new QHBoxLayout;
	layout->addWidget(threadAButton);
	layout->addWidget(threadBButton);
	layout->addWidget(quitButton);
	QHBoxLayout *mainLayout=new QHBoxLayout;
	mainLayout->addLayout(layout);
	setLayout(mainLayout);
    	quitButton->setDefault(true);
 
    	connect(threadAButton, SIGNAL(clicked()), this, SLOT(startOrStopThreadA()));
    	connect(threadBButton, SIGNAL(clicked()), this, SLOT(startOrStopThreadB()));
	QCloseEvent *event=new QCloseEvent();
	connect(quitButton, SIGNAL(clicked()), this, SLOT(closeEvent(event)));
}
 
void ThreadDialog::startOrStopThreadA()
{
    if (threadA.isRunning()) {
        threadA.stop();
        threadAButton->setText(tr("Start A"));
    } else {
        threadA.start();
        threadAButton->setText(tr("Stop A"));
    }
}
void ThreadDialog::startOrStopThreadB()
{
    if (threadB.isRunning()) {
        threadB.stop();
        threadBButton->setText(tr("Start B"));
    } else {
        threadB.start();
        threadBButton->setText(tr("Stop B"));
    }
}
 
void ThreadDialog::closeEvent(QCloseEvent *event)
{
    threadA.stop();
    threadB.stop();
    threadA.wait();
    threadB.wait();
    event->accept();
}
 
int main(int argc, char **argv)
{
	QApplication app(argc,argv);
	ThreadDialog t(&app);
	t.resize(300,200);
	t.show();
	return app.exec();	
}

/*t.cpp*/
#include <iostream.h>
#include <t.h>
#include <QString>
int i=0;
 
MyThread::MyThread(QObject *parent)
: QThread(parent)
{
	stopped = false;
}
 
void MyThread::run()
{
  

while (!stopped)
{
        cerr << qPrintable(msg)<< endl;
	//msleep(500);
 }   
stopped=false;
}


void MyThread::stop()
{
    stopped = true;
}
void MyThread::setMessage(const QString &message)
{
	msg=message;
	//run();
}

ThreadDialog::ThreadDialog(QApplication *app,QWidget *parent)
    : QDialog(parent)
{
    threadA.setMessage("Anurag");
    threadB.setMessage("Sonu");
    threadAButton = new QPushButton(tr("Start A"),this);
    threadBButton = new QPushButton(tr("Start B"),this);
    quitButton = new QPushButton(tr("Quit"),this);
	QHBoxLayout *layout=new QHBoxLayout;
	layout->addWidget(threadAButton);
	layout->addWidget(threadBButton);
	layout->addWidget(quitButton);
	QHBoxLayout *mainLayout=new QHBoxLayout;
	mainLayout->addLayout(layout);
	setLayout(mainLayout);
    	quitButton->setDefault(true);
    
    	connect(threadAButton, SIGNAL(clicked()), this, SLOT(startOrStopThreadA()));
    	connect(threadBButton, SIGNAL(clicked()), this, SLOT(startOrStopThreadB()));
	QCloseEvent *event=new QCloseEvent();
	connect(quitButton, SIGNAL(clicked()), this, SLOT(closeEvent(event)));
}

void ThreadDialog::startOrStopThreadA()
{
    if (threadA.isRunning()) {
        threadA.stop();
        threadAButton->setText(tr("Start A"));
    } else {
        threadA.start();
        threadAButton->setText(tr("Stop A"));
    }
}
void ThreadDialog::startOrStopThreadB()
{
    if (threadB.isRunning()) {
        threadB.stop();
        threadBButton->setText(tr("Start B"));
    } else {
        threadB.start();
        threadBButton->setText(tr("Stop B"));
    }
}

void ThreadDialog::closeEvent(QCloseEvent *event)
{
    threadA.stop();
    threadB.stop();
    threadA.wait();
    threadB.wait();
    event->accept();
}

int main(int argc, char **argv)
{
	QApplication app(argc,argv);
	ThreadDialog t(&app);
	t.resize(300,200);
	t.show();
	return app.exec();	
}

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plz give some proper suggestions.
with regards!

[jpn]

As it says, QWidget::closeEvent() is not a slot. Furthermore, signals and slots don't work that way. You can't add variables to connect statement.

connect(quitButton, SIGNAL(clicked()), this, SLOT(close()));

connect(quitButton, SIGNAL(clicked()), this, SLOT(close()));

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Recommended reading: signals and slots

[ashukla]

As it says, QWidget::closeEvent() is not a slot. Furthermore, signals and slots don't work that way. You can't add variables to connect statement.

connect(quitButton, SIGNAL(clicked()), this, SLOT(close()));

connect(quitButton, SIGNAL(clicked()), this, SLOT(close()));

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Recommended reading: signals and slots

Dear Sir!
I have used close slot before viewing this post. But I couldn't think this QWidget::closeEvent() is a function however I have seen this function earlier; So I am facing trouble.
Thanks!

[jpn]

Don't guess and seem to remember which one is slot and which one is not. It is all clearly and well documented in the Qt reference documentation. I keep Qt Assistant always open while writing anything related to Qt. I suggest you do the same.