Warning when cancel download file?

Kien Bui

[CODE]QCoreApplication::postEvent: Unexpected null receiver
[/CODE]

I don't know call what.
I make a downloader into a app, when I cancel download, I waning on console.
I don't know how to debug with problem.

SGaist

Hi,

Are you doing any delete call in your code ?

By the way, which version of Qt are you using ?
On what platform ?

Kien Bui

Sure. I used delete

I code and run at Linux (ubuntu14.04)
Qt5.2.
Addition, Am I wrong?

QNetworkReply *reply;
...
if (reply != nullptr)
    {
        reply->disconnect();
        reply->abort();
        reply->deleteLater();
        reply = nullptr;
    }

SGaist

From the snippet you posted, you don't use delete but deleteLater. Why are you calling disconnect ? It will kill all connections done to the object.

Kien Bui

@SGaist but when I use deleteLater() download progress still is working, I need stop download file immedicately

SGaist

Because the event loop has not yet processed every event thus the download might go some bytes further defore everything is processed.

seyed

@Kien-Bui for me, I called deleteLater 2 times while I set the m_reply as null after the first time, so the second time Qt warned me QCoreApplication::postEvent: Unexpected null receiver correctly.
That behavior was because I forgot that calling abort results in emitting the finished signal.
Just for testing, wrap the deleteLater with a null checking if statement.

if (this->reply != nullptr) {
        this->reply->deleteLater();

Also, you can use the delete with care if you like.