48

（1）
#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

private:
    Ui::MainWindow *ui;
protected:
    void timerEvent(QTimerEvent *e);
};

#endif // MAINWINDOW_H





（2）
#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    startTimer(5000);
}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::timerEvent(QTimerEvent *e)
{
    //close();
}





（3）
#include "mainwindow.h"
#include <QApplication>
#include <QTimer>

MainWindow* function1()
{
    MainWindow* w=new MainWindow();
    w->show();//(*w).show();
    //for(int i1=0;i1<999999;i1++){for(int i2=0;i2<999999;i2++){}   }
    //delete w;
    return w;
}

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    /*MainWindow w;
    w.show();*/
    QTimer * timer = new QTimer;

    MainWindow* p=function1();
    //delete p;

    QObject::connect(timer,&QTimer::timeout,p,&MainWindow::close);

    timer->start(5000);

    int result = a.exec();
    delete p;
    return result;
}