转自

http://hi.baidu.com/shiwl111/item/91dcf90fcf6b42eaf55ba672

使用QSplashScreen的过程中发现主线程阻塞的情况下QSplashScreen不发生重绘，只需要加上app.processEvents()就可以了。

int main(int argc, char* argv[])

{     QApplication app(argc, argv);     QSplashScreen *splash = new QSplashScreen;     splash->setPixmap(QPixmap(":/images/slogo.png"));     splash->show();     app.processEvents();     QWidget *window = new QWidget;     // do something ...     window->show();     splash->finish(window);     delete splash;     app.exec(); }