Problem with QT 4.6 qDebug and QString.

If I do the following code I get a compile failure;

error: no matching function for call to 'qDebug(QString&)'

QString s = "Test";
qDebug(s);


I have tried using qDebug("%s",s) and qDebug(s.toAscii()), but those don't work either.

I also tried (and I included <QDebug>):

qDebug << s;

I am sure this use to work in previous versions.

I tired a search, but no answer.

After working with for another hour I found that I can use QString.toLatin1().

qDebug(s.toLatin1());


Sorry, but that is flat ugly; there has to be a better way.

There is. just include #include <QDebug>

then you can just do qDebug() << str; This works perfectly for me.

Also you can do qDebug() << qPrintable(str);

It does not work for me. I get this error.

/home/me/Development/Qt-Projects/PodCastBurner/mainwindow.cpp:63: error: no match for ‘operator<<’ in ‘qDebug << msg’

Are you using 4.6?

And yes I did add this line:
#include <QDebug>

Quote:

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Originally Posted by weaver4

#include <QDebug>

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According to qDebug documentation the file to include is <QtDebug> not <QDebug> and once you have included that file then you should be able to use next format of qDebug:

Code:

---

qDebug() << "string";

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Please note the "()" charcters. If that still does not work, please provide a minimal example code with the problem.

Nope neither QDebug or QtDebug would cause this statement to work.

qDebug() << str;

Same error.

Try this:

Code:

---

#include <QtDebug>
 
int main() {
  qDebug() << "Testing";
  qDebug() << QString("QString works as well");
  return 0;
}

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If you're using Qt Creator, goto Projects/ Run Settings/ Run and click checkbox titled "Run in terminal"