QObject::connect says "no such signal"

[MistaPain]

Hi,

I've been trying to use a QSpinBox in my project. I would like to use the signal "valueChanged(int i)" (as described in the documentation), but at runtime QObject::connect complains that there is no such signal ;-(

I thought that something with my code was wrong. But even the following small application is suffering the same problem:

#include <QtGui>
#include <QApplication>
 
int main(int argc, char **argv)
{
	QApplication app(argc, argv);
 
	QSpinBox sB;
 
	QObject::connect(
		&sB,  SIGNAL(valueChanged(int i)),
		&app, SLOT(quit())
	);
 
	sB.show();
	return app.exec();
}

#include <QtGui>
#include <QApplication>

int main(int argc, char **argv)
{
	QApplication app(argc, argv);

	QSpinBox sB;

	QObject::connect(
		&sB,  SIGNAL(valueChanged(int i)),
		&app, SLOT(quit())
	);

	sB.show();
	return app.exec();
}

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I'm using QT 4.2.0 for Windows and MingW.

Can anyone spot the point where my mistake is? I'm really getting mad about this.

[munna]

try this

QObject::connect(
        &sB,  SIGNAL(valueChanged(int)),
        &app, SLOT(quit())
    );

QObject::connect(
        &sB,  SIGNAL(valueChanged(int)),
        &app, SLOT(quit())
    );

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In signal and slot you should only specify the variable type and not the variable name.

[MistaPain]

Interesting. I just tried some other signals and for example QAbstractSpinBox::editingFinished() and they seem to work. QObject::destroyed() works, too, but QObject::destroyed(&something) doesn't.

It seems that signals without parameters work, but all other fail. Can anyone reproduce this behaviour?

edit: Oh, munna. You're right. The naming was my mistake. Thank you very much for your help. I've been struggling more than an hour now.

[aamer4yu]

Even the

SIGNAL(valueChanged(int i))

SIGNAL(valueChanged(int i))

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is working fine with me. I am using Visual C++ 6.0 with Qt 4.2.0