Qt启动程序时加载画面

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    QSplashScreen *splash = new QSplashScreen;
    splash->setPixmap(QPixmap(":/images/splash.png"));    //设置图片
    splash->show();    //显示图片
    Qt::Alignment topRight = Qt::AlignRight | Qt::AlignTop;
    splash->showMessage(QObject::tr("Setting up the main window..."),
                        topRight, Qt::white);    //显示启动信息
    MainWindow mainWin;
    splash->showMessage(QObject::tr("Loading modules..."),
                        topRight, Qt::white);    //显示模块信息
    loadModules();
    splash->showMessage(QObject::tr("Establishing connections..."),
                        topRight, Qt::white);    //显示网络链接信息
    establishConnections();
    mainWin.show();
    splash->finish(&mainWin);    //图片一直显示到mainWin加载完成
    delete splash;    //释放空间，节省内存
    return app.exec();
}