bool MainWindow::waitForLoad(QWebView& view)
{
QEventLoop loopLoad;
QTimer timer;
QObject::connect(&view, SIGNAL(loadFinished(bool)), &loopLoad, SLOT(quit()));
QObject::connect(&timer, SIGNAL(timeout()), &loopLoad, SLOT(quit()));
timer.start(timeout);
loopLoad.exec();
if(!timer.isActive())
{
timer.stop();
view.stop();
return false;
}
return true;
}
说我,这是正确的代码吗?应用程序有时会在行后冻结
loopLoad.exec();
并且总是返回true,即使这里发生了一些问题(超时,加载时出错,等等 - 总是如此)。
答案 0 :(得分:3)
start(timeout);
以超时间隔msec毫秒启动计时器。所以在调用它之后,计时器正在运行,timer.isActive()
总是返回true而if块没有被执行。
你应该在发出loadFinished时停止计时器:
QObject::connect(&view, SIGNAL(loadFinished(bool)), &timer, SLOT(stop()));
如果计时器处于活动状态,则计时器会停止事件循环,因此您应该返回false,因为已发生超时。您应该将if(!timer.isActive())
替换为if(timer.isActive())
。
正确的代码是:
bool MainWindow::waitForLoad(QWebView& view)
{
QEventLoop loopLoad;
QTimer timer;
QObject::connect(&view, SIGNAL(loadFinished(bool)), &loopLoad, SLOT(quit()));
QObject::connect(&view, SIGNAL(loadFinished(bool)), &timer, SLOT(stop()));
QObject::connect(&timer, SIGNAL(timeout()), &loopLoad, SLOT(quit()));
timer.start(timeout);
loopLoad.exec();
if(timer.isActive())
{
timer.stop();
view.stop();
return false;
}
return true;
}