QT 事件循环问题之QEventLoop

Question

QT中如果在QApplication.exec()之前执行QEventLoop.exec()， 简要代码如下:

代码

int main(int argc, char *argv[]){
     ........
    QEventLoop eventLoop;
    QTimer timer;
    timer.setSingleShot(true);
    QObject::connect(&timer, SIGNAL(timeout()), &eventLoop, SLOT(quit()));
    QObject::connect(reply, SIGNAL(finished()), &eventLoop, SLOT(quit()));
    timer.start(timeout);
    eventLoop.exec(QEventLoop::ExcludeUserInputEvents);
    .......
    QApplication a(argc, argv);
    a.exec();
}

为什么程序会阻塞在eventLoop.exec()？

Answer 1

试试把QApplication a(argc, argv);挪到最上面