Hi everyone, this is the code i've written. Basically, my code has errors that cause it to terminate which i can't debug. But, the main question i'm trying to ask, is whether while loops will continue its next iteration even before the signal and slot is done. So, in the code, i'm looping through a map to determine the key and value inside. For each set of key and value pair, i'm going to use a connect to allow the webpage to load finished and then bring it to parse2(bool) to parse information. So far, it has not been giving me the right outcome and sometimes it says "QWaitCondition: Destroyed while threads are still waiting". But, i was wondering is it because the next iteration of the while loop causes this error to come out because it takes time for a webpage to load and to parse the information out? I have no idea how to test this out or debug.

A QObject::connect() does not call in to any other code of yours; in particular, it won't execute slots. The same is true for all the other calls yo made, so you should be safe there. Your problem must be elsewhere.

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Does a loop continue running even if Signals and slot is not complete?

Solved General and Desktop

21 Posts 5 Posters 3.9k Views

J J.Hilk

@GCDX
untested of course.

MainWindow::MainWindow(...){
    ....
    connect(innerPage, SIGNAL(loadFinished(bool)), SLOT(parse(bool)));
    urlList = QList<QUrl> ({QUrl("Url1"), QUrl("Url"), ...});
}

void MainWindow::continue(){
     if(cnt < urlList.size()){
         innerPage->setUrl(urlList.at(cnt));      
         print(cnt); 
     } 
}

void MainWindow::on_pushButton_clicked()
{
   cnt = 0;
   continue();
}

void MainWindow::parse(bool)
{
QWebFrame *frameInner = innerPage->page()->mainFrame();
QWebElement doc = frameInner->documentElement();
QString json=doc.toPlainText();
//parsing code
print("parsing executed");
   continue();
}
}

6thC

wrote on

#21

@J.Hilk said in Does a loop continue running even if Signals and slot is not complete?:

connect(innerPage, SIGNAL(loadFinished(bool)), SLOT(parse(bool)));

well there you go - I mean, I'd have expected that to be just fine in the new syntax but there it is specifying SIGNAL and SLOT too =) - that's new to me.