Russian Qt Forum

#include <QApplication>
#include <QThread>
#include <QEvent>
#include <QPushButton>
#include <QDebug>
//
class Thread: public QThread
{
protected:
	void customEvent(QEvent*)
	{
		qDebug() << currentThread() << QApplication::instance()->thread();

		QPushButton *pb = new QPushButton("!");
		connect(pb, SIGNAL(clicked()), pb, SLOT(close()));
		pb->show();
	}
};
//
int main(int argc, char *argv[])
{
	QApplication app(argc, argv);

	Thread *thrd = new Thread();
	thrd->start();
	QApplication::postEvent(thrd, new QEvent(QEvent::User));

	return app.exec();
}

connect(pb, SIGNAL(clicked()), pb, SLOT(close()));