1.2 连接信号和响应函数

#include<QtGui/QApplication>
#include<QPushButton>
intmain(intargc,char*argv[])
{
QApplicationapp(argc,argv);
QPushButton*button=newQPushButton("Quit");
QObject::connect(button,SIGNAL(clicked()),&app,SLOT(quit()));
button->show();
app.exec();
}