1.2 建立连接

#include <QApplication>
#include <QPushButton>
int main(int argc, char** argv)
{
    QApplication app(argc, argv);
    QPushButton button(QObject::tr("Quit"));
    button.show();
    //信号槽链接，当button对象被点击时发射clicked()信号，
    //app对象接收到信号后，执行槽函数quit()
    QObject::connect(&button, SIGNAL(clicked()),  &app, SLOT(quit()));
    button.show();
    return app.exec();
}
//bool QObject::connect(const QObject   *sender,     //发出信号的对象
//                      const char      *signal,     //信号
//                      const QObject   *receiver,   //接收信号的对象
//                      const char      *method,     //对象接收到信号后的处理
//                      Qt::ConnectionType type = Qt::AutoConnection ) [static] //连接方式
//                        type:
//                            Qt::AutoConnection
//                            Qt::DirectConnection
//                            Qt::QueuedConnection
//                            Qt::BlockingQueuedConnection
//                            Qt::UniqueConnection
//                            Qt::AutoCompatConnection

图片:2.png