qDebug() has stopped working - seriously

[cpper]

I was experimenting with qDebug().noquote() and QTextStream(stdout) to print a QByteArray's content, and after undoing my code back to the initial simple qDebug() statements, which worked before, I no longer get any output at all. It's like something changed in the behavior of qDebug. I restarted qt creator, made another project, but with no help. Does this make any sense ?
Providing code doesn't help, but what I'm trying to say is:

1. simple qDebug() code is working, I get expected output
2. I edit it to experiment with .noquote and also with qtextstream
3. I un-do (ctrl z) the code back to state #1 and now don't get any output.

The initial QByteArray didn't change, printing it with QTextStream still works fine.

[SGaist]

Hi,

A minimal code sample would still be useful to try to reproduce your problem.

You should also add the Qt version and platform you are running on.

[cpper]

Hi SGaist, and thanks for helping out again :)

This is the initial code, I was trying to see what output I get from different methods.

QByteArray x=reply->readAll();

    qDebug()<<x.toStdString().c_str();
    qDebug()<<QString(x);
    qDebug()<<QString::fromUtf8(x);
    qDebug()<<x;

It was working fine, the first line had the nicest output because it actually displayed newlines and tabs instead of '/n' or '/x9 ' . But I didn't like the idea of converting to std::string so I tried something with qDebug().noquote(). As far as I remember, this is how the code next looked:

QByteArray x=reply->readAll();

   //qDebug()<<x.toStdString().c_str();
   //qDebug()<<QString(x);
   //qDebug()<<QString::fromUtf8(x);
   qDebug().noquote()<<x;

I didn't get the expected output, so I googled a bit and did something like:

QByteArray x=reply->readAll();
QTextStream out(stdout);

    //qDebug()<<x.toStdString().c_str();
    //qDebug()<<QString(x);
    //qDebug()<<QString::fromUtf8(x);
    out<<x;

The output was looking nice, with actual newlines and tabs. Next I ctrl-z-ed back to the initial code, compiled, and got nothing, without changing anything in the code.

I'm using Qt_5_8_0_MSVC2015_64bit on Win 7.

[SGaist]

Nothing or empty ?

You should add a minimal amount of text before your send your x variable to the debug output. You might be getting an empty reply for some reason.

[cpper]

Doing qDebug()<<"something"<<x; doesn't print anything. qDebug()<<"anything"; qDebug()<<"something"<<x; only prints "anything".
The network reply is not empty, I can print it successfully with QTextStream, or write it to a file with QFile::write().

[SGaist]

Which version of Qt Creator ?

By the way 4.2.2 is out.

[Asimov]

Have you tried QString instead of standard string?

[cpper]

@SGaist It's Qt Creator 4.2.1
@Asimov I'm not sure what you mean.

[SGaist]

Then you should update to 4.2.2

[Asimov]

@cpper
Sorry it took so long to get back, been busy.
I was thinking something like this.
Of course I didn't have your function to try this with, but thought this might work.
I am converting a QByteArray to a QString and then displaying it.

It probably won't help, but might be worth a try (I might not be understanding everything in your code though).

QByteArray qString("A Qbyte String");
QString myString(qString);
qDebug()<<"Your string is" << myString;